CN116929687A - Vibration fatigue test device and method for realizing gradient temperature field - Google Patents
Vibration fatigue test device and method for realizing gradient temperature field Download PDFInfo
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- CN116929687A CN116929687A CN202310877309.8A CN202310877309A CN116929687A CN 116929687 A CN116929687 A CN 116929687A CN 202310877309 A CN202310877309 A CN 202310877309A CN 116929687 A CN116929687 A CN 116929687A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a vibration fatigue test device and a method for realizing a gradient temperature field, wherein the device comprises a high-temperature furnace; the high-temperature furnace comprises a temperature control box, a hearth, a test piece clamping panel, an observation window panel and a test piece clamp; the temperature control box is of a hollow box-shaped structure with two open ends, and the hearth is embedded in the temperature control box; the hearth is used for forming a gradient temperature field in the temperature control box; the test piece clamping panel is arranged at the opening of the first end of the temperature control box in a matched mode, and the observation window panel is arranged at the opening of the second end of the temperature control box in a matched mode; the test piece clamp is rotatably arranged on the inner side of the test piece clamping panel, one end of the test piece to be tested is clamped and fixed on the test piece clamp, and the other end of the test piece to be tested extends to the inside of the temperature control box; the outer side of the test piece clamping panel or the bottom of the temperature control box is connected with the excitation mechanism; the device provided by the invention has the advantages of simple structure and high accuracy of test results, effectively improves the reliability of the vibration fatigue test process of equipment, and reduces the extra energy loss of the vibration test.
Description
Technical Field
The invention belongs to the technical field of aeroengine test equipment, and particularly relates to a vibration fatigue test device and method for realizing a gradient temperature field.
Background
The air-cooled turbine blade is an important hot end component for realizing the core function of the aero-engine, and the actual environment is up to 1200 ℃; in order to ensure the normal service of the blade in a high-temperature environment, the working temperature of the surface of the blade needs to be reduced by gas cooling; the cooling air flows in the blade and is extruded through the film holes, so that non-uniform temperature distribution (namely, the generation of temperature gradient) becomes the most common working environment of the air-cooled turbine blade in service.
In addition, the blade is generally subjected to a complex load form in the actual service process, and is subjected to the effects of thermal shock, thermal stress and gas hot corrosion and the vibration effect caused by aerodynamic force and excitation; the mutual coupling of the above effects can exacerbate the failure of the structural members of the aircraft engine; the complexity of the working environment of the turbine blade makes the vibration fatigue characteristic of the blade at high temperature an important influencing factor for measuring the safety life of the blade; the vibration fatigue test of the aero-engine blade at high temperature aims at obtaining the vibration fatigue life and the vibration fatigue limit of the blade.
Because the turbine blade is of an asymmetric structure, in an actual blade vibration test, blades of different types, different tool angles and different excitation directions can cause the blades to generate different vibration responses; the design of the fixture is usually required before the vibration fatigue test of the blade, but a great deal of early fumbling or experience accumulation is required for the design and the manufacture of a fixture, and once the model, the fixture angle or the excitation direction of the blade are changed, the fixture cannot be applied; and the different excitation directions can also significantly affect the vibration fatigue life of the turbine blade.
At present, the test aiming at the development of the vibration fatigue performance of the turbine blade is generally carried out at normal temperature; however, the mechanical properties and fatigue behavior of the aviation material are significantly different at normal temperature and high temperature; this can lead to the fact that the measured turbine blade vibration fatigue life and fatigue limit data at normal temperature are difficult to reflect the working performance of the actual service blade; secondly, for air cooled turbine blades, the materials are typically subjected to a working environment having a large temperature gradient; the mechanical properties and fatigue life of the high-temperature structural material in a temperature gradient field and an isothermal environment are obviously different, and the simulation of the real working environment of the turbine blade cannot be realized by using a uniform temperature field, so that larger errors are brought to practical engineering application; in addition, in the existing high-temperature vibration fatigue technology, the blade clamping device and the heating device are mutually independent; this makes it necessary to externally connect cooling circulating water to the clamping device for cooling the contact surface between the clamping device and the vibration table; however, this can lead to the clamping device constantly conducting heat from the heating device to the outside, thereby bringing a lot of extra energy loss to the test; finally, the clamping angle of the test piece clamping device for the vibration fatigue test is single at present, and the research on the vibration fatigue performance of the test piece in different excitation directions is difficult to meet.
In summary, designing a vibration fatigue high-temperature furnace with an uneven temperature field for a high-frequency vibration table has important significance in the strength test of the related engine hot end components; the research work of the vibration fatigue behavior and the damage evolution rule of the hot end component and the material of the aero-engine in different excitation directions under the non-uniform temperature field can bring important scientific basis and technical support for the development and research of the aero-engine.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a vibration fatigue test device and a vibration fatigue test method for realizing a gradient temperature field, which are used for solving the technical problems that in the existing turbine blade vibration test, the clamping angle of a blade is too single, an uneven temperature field with a temperature gradient cannot be generated, and then the vibration response and the vibration fatigue behavior of the turbine blade cannot be measured under the real condition.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a vibration fatigue test device for realizing a gradient temperature field, which comprises a high-temperature furnace, a test piece to be tested and an excitation mechanism; the excitation mechanism is used for providing excitation force and transmitting the excitation force to a test piece to be tested through the high-temperature furnace;
The high-temperature furnace comprises a temperature control box, a hearth, a test piece clamping panel, an observation window panel and a test piece clamp; the temperature control box is of a box-shaped structure with two open ends and hollow, and the hearth is embedded in the temperature control box; wherein the hearth is used for forming a gradient temperature field in the temperature control box;
the test piece clamping panel is arranged at the opening of the first end of the temperature control box in a matched mode, and the observation window panel is arranged at the opening of the second end of the temperature control box in a matched mode; the test piece clamp is rotatably arranged on the inner side of the test piece clamping panel, one end of the test piece to be tested is clamped and fixed on the test piece clamp, and the other end of the test piece to be tested extends to the inside of the temperature control box; the outer side of the test piece clamping panel or the bottom of the temperature control box is connected with the excitation mechanism.
Further, the temperature control box comprises a top plate, two side plates and a bottom plate; the top plate and the bottom plate are arranged in parallel up and down, and the two side plates are vertically arranged between the top plate and the bottom plate in parallel; a laser incidence window is formed in the top plate, and quartz glass is adopted at the laser incidence window for covering and sealing; the outside of the laser incidence window is provided with a laser displacement sensor, and the laser incidence window is used for irradiating laser beams emitted by the laser displacement sensor into the temperature control box.
Further, the hearth comprises a hearth body and resistance wires, wherein the resistance wires are arranged in the hearth body;
the hearth body is an enclosed non-equidistant hearth or a single-sided non-equidistant hearth;
the surrounding type non-equidistant hearth is of a hollow rectangular block structure, and a truncated cone-shaped cavity is formed in the hollow rectangular block structure; the resistance wires are embedded on the inner wall of the circular truncated cone-shaped cavity in a non-equidistant spiral arrangement mode;
the single-sided non-equidistant hearth is of a pentahedron structure with a right triangle cross section, and the resistance wires are embedded on the inclined plane of the single-sided non-equidistant hearth in a periodic curve arrangement mode.
Further, the test piece clamping panel comprises a clamping panel body and a fixing ring; the clamping panel body is vertically arranged at the opening of the first end of the temperature control box, and the fixed ring is fixedly arranged at the center of the inner side of the clamping panel body; the inner arc surface of the fixed circular ring and the inner surface of the clamping panel body are surrounded to form a cylindrical groove, and the test piece clamp is rotatably arranged in the cylindrical groove.
Further, the test piece clamp comprises a cylindrical fixing part, a semicircular column type clamping part and a test piece pressing block;
The cylindrical fixing part is matched and arranged in the circular arc-shaped groove; wherein, the first end of the cylindrical fixing part is tightly contacted with the inner surface of the clamping panel body, and the outer circumferential surface of the cylindrical fixing part is tightly contacted with the inner circumferential surface of the cylindrical groove;
the semicircular column type clamping part is concentrically fixed at the second end of the cylindrical fixing part, and a rectangular groove is formed in the center of the rectangular bottom surface of the semicircular column type clamping part; the test piece pressing block is arranged in the rectangular groove in a matched mode, and the test piece to be tested is clamped between the test piece pressing block and the rectangular groove.
Further, the test piece to be tested is of a flat plate structure and comprises a clamping section and a test section which are axially connected in sequence; circular arc-shaped necking structures are symmetrically arranged on two sides of the clamping section, and a circular through hole is formed in the center of the end part of the clamping section;
a fixing bolt hole is formed in the bottom of the rectangular groove, and a through hole is formed in the center of the test piece pressing block; the through holes, the round through holes and the fixing bolt holes are arranged in a penetrating manner from top to bottom; and the through hole, the circular through hole and the fixing bolt hole are sequentially penetrated by a fixing bolt, so that the test piece pressing block, the test piece to be tested and the semi-cylindrical clamping part are fixed together.
Further, the test piece clamping panel also comprises a connecting flat plate and a plurality of reinforcing plates; the connecting flat plate is horizontally arranged at the bottom end of the outer side of the clamping panel body, and the plurality of stiffening plates are uniformly distributed between the connecting flat plate and the clamping panel body; the connecting plate is provided with a plurality of connecting bolt holes, and the connecting bolt holes are used for connecting the connecting plate with the excitation mechanism by bolts.
Further, a connecting sheet is arranged on the bottom surface of the temperature control box, and the connecting sheet is arranged at four corners of the bottom surface of the temperature control box; the connecting sheet is used for fixedly connecting the temperature control box with the excitation mechanism or the bearing platform.
Further, the bearing platform comprises a bearing table top and four mutually independent lifting support legs;
the bearing table top is horizontally arranged below the bottom surface of the temperature control box, and the upper surface of the bearing table top is fixed with the bottom surface of the temperature control box through the connecting sheet; the four lifting support legs are symmetrically arranged below the lower surface of the bearing table top and are uniformly distributed at four corners of the bearing table top.
The invention also provides a vibration fatigue test method for realizing the gradient temperature field, and the vibration fatigue test device for realizing the gradient temperature field is utilized;
The vibration fatigue test method comprises the following steps:
fixing a test piece to be tested in the test piece clamp, and then installing the test piece clamp with the test piece to be tested on a test piece clamping panel; then, connecting a temperature control box or a test piece clamping panel with the excitation mechanism; and finally, setting and waiting for the internal temperature of the hearth to reach a target temperature value, and starting the excitation mechanism until the test is finished.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a vibration fatigue test device and a method for realizing a gradient temperature field, wherein a test piece clamp is arranged on the inner side of a test piece clamping panel, namely, the clamp is embedded into a high-temperature furnace; the heat loss is avoided by utilizing the closed structure of the high-temperature furnace, and an additional water cooling device is not required to be arranged for cooling; the test piece clamp is rotatably connected with the test piece clamp panel, and the clamping angle of the test piece to be tested can be adjusted according to test requirements; the hearth is arranged in the temperature control box, and a gradient temperature field is formed in the temperature control box by utilizing the hearth, so that the simulation of the vibration response and the vibration fatigue behavior of the turbine blade under the real condition is realized; connecting the temperature control box or the test piece clamping panel with the excitation mechanism to provide reliable and stable excitation force for the test piece to be tested; the device has simple structure and high accuracy of test results, effectively improves the reliability of the vibration fatigue test process of equipment, and reduces the extra energy loss of the vibration test.
Further, a laser incidence window is formed in a top plate of the temperature control box, and a laser displacement sensor is arranged on the outer side of the laser incidence window; the amplitude of the test piece to be tested can be monitored in real time through the laser displacement sensor.
Further, when the furnace body adopts an enclosed non-equidistant furnace, the resistance wires are embedded on the inner wall of the circular truncated cone-shaped cavity in a non-equidistant spiral arrangement mode, and the non-uniform temperature field with a temperature gradient is formed in the temperature control box by utilizing the non-uniform arrangement density degree of the resistance wires and the non-equidistant arrangement of the inner wall of the circular truncated cone-shaped cavity and the distance between the inner wall of the circular truncated cone-shaped cavity and a test piece to be tested.
Further, when the hearth body adopts a single-sided non-equidistant hearth, the resistance wires are embedded on the inclined plane of the single-sided non-equidistant hearth in a periodic curve arrangement mode, and the non-uniform temperature field with the temperature gradient is formed in the temperature control box by carrying out single-sided heating on the test piece to be tested and setting the distance between the inclined plane of the hearth body and the test piece to be tested to be non-equidistant.
Further, a fixed ring is arranged on the clamping panel body, and a cylindrical fixing part in the test piece clamp is matched and installed in a cylindrical groove of the fixed ring; through the installation angle of adjusting cylindrical fixed part to realize to await measuring test piece anchor clamps installation angle to adjusting, and then realize adjusting the clamping angle of awaiting measuring test piece according to experimental requirement.
Further, the connecting flat plate is arranged at the bottom of the outer side of the clamping panel body, and the test piece clamping panel can be connected with the excitation mechanism by the connecting flat plate so as to effectively transmit the excitation force to the test piece to be tested.
Further, through setting up the loading platform in the bottom surface below of control by temperature change case, utilize the high regulation effect of the lift landing leg that sets up in the loading platform, realize the high regulation to the control by temperature change case to reach the arbitrary adjustment effect to the working height of high temperature furnace.
Drawings
FIG. 1 is a schematic view showing the overall structure of a vibration fatigue test apparatus according to example 1;
FIG. 2 is a top view of the vibration fatigue test apparatus according to example 1;
FIG. 3 is a schematic view showing the structure of a high temperature furnace in example 1;
FIG. 4 is a side view of the high temperature furnace of example 1;
fig. 5 is a schematic structural diagram of a temperature control box in embodiment 1;
FIG. 6 is a schematic structural diagram of a test piece clamping panel in embodiment 1;
FIG. 7 is a schematic structural view of a test piece holder in example 1;
FIG. 8 is a schematic structural diagram of the test piece compact of example 1;
FIG. 9 is a schematic diagram of the structure of a test piece to be tested in example 1;
FIG. 10 is a schematic view showing the clamping effect of the test piece to be tested in example 1;
FIG. 11 is a schematic view of the structure of the surrounding non-equidistant furnace in example 1;
FIG. 12 is a schematic view of the arrangement of resistance wires in an enclosed non-equidistant furnace in example 1;
FIG. 13 is a schematic view of the structure of a single-sided non-equidistant furnace in example 1;
FIG. 14 is a schematic view of the arrangement of resistance wires in a single-sided non-equidistant furnace as in example 1;
fig. 15 is a schematic structural diagram of a carrying platform in embodiment 1;
FIG. 16 is a schematic view showing a partial structure of the lifting leg in embodiment 1;
FIG. 17 is a schematic view showing the structure of a high temperature furnace in example 2;
fig. 18 is a block diagram showing the structure of a vibration fatigue test system in example 3.
The device comprises a temperature control box 1, a hearth 2, a test piece clamping panel 3, an observation window panel 4, a test piece clamp 5, a test piece to be tested 6, a bearing platform 7, a laser displacement sensor 8 and an acceleration sensor 9; 11 top plate, 12 side plate, 13 bottom plate, 14 laser incident window, 15 connecting sheet, 16 temperature control panel; a 21 hearth body and 22 resistance wires; 31 clamping the panel body, 32 connecting the flat plate, 33 fixing the circular ring, 34 reinforcing plate and 35 handle; a 51 cylindrical fixing part, a 52 semi-cylindrical clamping part, a 53 test piece pressing block, a 54 rectangular groove and a 55 penetrating through hole; 61 clamping sections, 62 test sections and 63 circular through holes; 71 carrying table-board, 72 lifting leg, 73 ratchet slide bar, 74 track bar, 75 ratchet.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the following specific embodiments are used for further describing the invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1-16, embodiment 1 provides a vibration fatigue test device for realizing a gradient temperature field, which comprises a high temperature furnace, a test piece 6 to be tested and an excitation mechanism; the test piece 6 to be tested is arranged in the high-temperature furnace, the high-temperature furnace is connected with the excitation mechanism, and the excitation mechanism is used for providing excitation force and transmitting the excitation force to the test piece 6 to be tested through the high-temperature furnace.
The high-temperature furnace comprises a temperature control box 1, a hearth 2, a test piece clamping panel 3, an observation window panel 4 and a test piece clamp 5; the temperature control box 1 is of a box-shaped structure with two open ends and hollow, and the hearth 2 is embedded in the temperature control box 1; wherein, the hearth 2 is used for forming a gradient temperature field in the temperature control box 1; the test piece clamping panel 3 is arranged at the opening of the first end of the temperature control box 1 in a matched mode, and the observation window panel 4 is arranged at the opening of the second end of the temperature control box 1 in a matched mode; the test piece clamp 5 is rotatably arranged on the inner side of the test piece clamping panel 3, one end of the test piece 6 to be tested is clamped and fixed on the test piece clamp 5, and the other end of the test piece 6 to be tested extends to the inside of the temperature control box 1; the outer side of the test piece clamping panel 3 or the bottom of the temperature control box 1 is connected with the output end of the excitation mechanism.
In this embodiment 1, the temperature control box 1 includes a top plate 11, two side plates 12, and a bottom plate 13; the top plate 11 and the bottom plate 13 are arranged in parallel up and down, and the two measuring plates 12 are vertically arranged between the top plate 11 and the bottom plate 13 in parallel; a laser incidence window 14 is formed in the top plate 11, and quartz glass is adopted at the laser incidence window 14 for covering and sealing; preferably, the quartz glass is made of high-temperature resistant quartz glass material; the quartz glass is mounted at the laser light incident window 14 through a glass cover plate; the outside of the laser incidence window 14 is provided with a laser displacement sensor 8, and the laser incidence window 14 is used for irradiating laser beams emitted by the laser displacement sensor 8 into the temperature control box 1; preferably, the laser displacement sensor 8 is a blue laser displacement sensor.
Specifically, the top plate 11, the two side plates 12 and the bottom plate 13 are surrounded to form a hollow box structure with two open ends; the top plate 11, the side plates 12, the bottom plate 13 and the test piece clamping panel 3 are all heat insulation material plates; specifically, the heat insulation material plate comprises two panel layers and an intermediate layer, wherein the intermediate layer is arranged between the two panel layers; the interlayer is made of a heat-insulating material, and heat can be effectively prevented from being conducted to the outside through the interlayer made of the heat-insulating material; the technical form of a closed structure and a heat preservation interlayer is adopted to realize the purpose of no need of arranging an additional water cooling system; a rectangular laser incident window 14 is formed in the top plate 11, and is used for irradiating laser beams emitted by the laser displacement sensor 8 arranged outside to the inside of the hearth; the laser incident window 14 is covered and sealed by quartz glass with preset thickness, so that heat loss in the hearth is isolated; the quartz glass is fixed through a glass cover plate, and threaded holes are formed in four corners of the laser incidence window 14 and are used for fixing the glass cover plate through bolts or screws.
A rail groove is vertically formed at the first end of the side plate 12 and is used for being matched with the sliding rail protrusion on the clamping panel body 31 to form a rail mechanism capable of vertically sliding; the second end of one side plate is provided with a hinge groove, and threaded holes are uniformly formed in the hinge groove; wherein the hinge groove and the threaded hole are used for connecting a hinge mechanism of the observation window panel 4; the outside of the other side plate is provided with a temperature control panel 16 and an electric heating control element, and the temperature control panel 16 and the electric heating control element are connected with a resistance wire 22 and are used for setting and regulating the target temperature and the temperature gradient in the temperature control box 1; connecting pieces 15 are respectively arranged at four corners of the bottom surface of the bottom plate 13, each connecting piece 15 is provided with four bolt through holes, and the temperature control box 1 is fixed on a bearing platform or an excitation mechanism through the connecting piece 15; preferably, the vibration excitation mechanism adopts a vibration table.
In this embodiment 1, the furnace 2 includes a furnace body 21 and a resistance wire 22, and the resistance wire 22 is disposed in the furnace body 21; the hearth body 21 is an enclosed non-equidistant hearth or a single-sided non-equidistant hearth; the surrounding type non-equidistant hearth is of a hollow rectangular block structure, and a truncated cone-shaped cavity is formed in the hollow rectangular block structure; the resistance wires 22 are embedded on the inner wall of the circular truncated cone-shaped cavity in a non-equidistant spiral arrangement mode; the single-sided non-equidistant hearth is of a pentahedron structure with a right triangle cross section, and the resistance wires 22 are embedded on the inclined plane of the single-sided non-equidistant hearth in a periodic curve arrangement mode.
Specifically, the surrounding type non-equidistant hearth is of a hollow rectangular block structure, and a truncated cone-shaped cavity is formed in the hollow rectangular block structure; the external dimension of the hollow rectangular block structure is matched with the internal dimension of the temperature control box 1, and the hollow rectangular block structure is embedded in the temperature control box 1; the hollow rectangular block structure is made of refractory materials; a rectangular through hole is formed in the top of the hollow rectangular block structure, the size and the position of the rectangular through hole are matched with those of the laser incident window 14, and the rectangular through hole is used for irradiating laser beams into an inner cavity of the hollow rectangular block structure; the shape of the truncated cone-shaped cavity accords with the vibration movement characteristics of the cantilever beam structure in the vibration fatigue test process.
In the surrounding non-equidistant hearth, the arrangement form of the resistance wires 22 is matched with the shape of the truncated cone-shaped cavity; i.e. according to a non-equidistant spiral line; one end of the resistance wire 22 is a spiral line with a smaller pitch, and along with the extension of the axis direction of the circular-table-shaped cavity, the pitch and the spiral radius of the resistance wire 22 are gradually increased; at the rectangular through hole, the pitch of the resistance wire 22 is equal to or greater than the length of the rectangular through hole or the laser incident window; when the resistance wires 22 are embedded on the inner wall of the circular truncated cone-shaped cavity in a non-equidistant spiral arrangement mode, a temperature field with a temperature gradient can be generated in the circular truncated cone-shaped cavity under the action of power on; wherein, the principle of producing gradient temperature field in the non-equidistant furnace of enclosing formula includes: (1) The uneven density degree of the resistor wire arrangement is set, and (2) the distance between the inner wall of the surrounding non-equidistant hearth and the test piece to be tested is set non-equidistant.
The single-sided non-equidistant furnace is of a pentahedron structure with a right triangle-shaped cross section, the bottom surface of the single-sided non-equidistant furnace is a horizontal straight surface and is in close contact with the bottom plate 13 of the temperature control box 1, and the top surface of the single-sided non-equidistant furnace is an inclined surface and is arranged close to one side of a test piece 6 to be tested.
In the single-sided non-equidistant hearth, the arrangement form of the resistance wires 22 is a periodic curve form and is embedded on the inclined plane of the single-sided non-equidistant hearth; under the electrifying action, the heating distance of the single-sided non-equidistant hearth to the test piece to be tested is non-equidistant, and the test piece 6 to be tested has a single-sided heating effect only; therefore, a temperature field having a temperature gradient can be generated inside the temperature control box 1; wherein, the principle of producing gradient temperature field in the single-sided non-equidistant furnace chamber includes: (1) And (2) heating the test piece to be tested on one side only, wherein the distance between the inclined surface of the single-side non-equidistant hearth and the test piece is non-equidistant.
In this embodiment 1, the specimen holding panel 3 includes a holding panel body 31, a connecting plate 32, a fixing ring 33, a plurality of reinforcing plates 34, and a handle 35; the clamping panel body 31 is vertically arranged at the opening of the first end of the temperature control box 1, and the fixed circular ring 33 is fixedly arranged at the center of the inner side of the clamping panel body 31; the inner arc surface of the fixed ring 33 and the inner surface of the clamping panel body 31 are surrounded to form a cylindrical groove, and the test piece clamp 5 is rotatably arranged in the cylindrical groove; the connecting flat plate 32 is horizontally arranged at the bottom end of the outer side of the clamping panel body 31, and a plurality of stiffening plates 34 are uniformly distributed between the connecting flat plate 32 and the clamping panel body 31; wherein, a plurality of connecting bolt holes are formed on the connecting flat plate 32, and the connecting bolt holes are used for connecting the connecting flat plate 32 with the excitation mechanism by bolts; the handles 35 are symmetrically arranged on the outer side of the clamping panel body 31 and used for installing the test piece clamping panel 3 on the excitation mechanism and installing the test piece 6 to be tested.
Specifically, two ends of the inner side of the clamping panel body 31 are vertically provided with sliding rail protrusions, and the sliding rail protrusions are matched and arranged in the rail grooves of the side plates 12; the center of the inner surface of the clamping panel body 31 is also uniformly provided with a plurality of bolt holes, and the bolt holes are arranged in a circular array and are used for fixedly connecting a cylindrical fixing part 51 in the test piece clamp 5 with the clamping surface body 31 through bolts so as to realize rotatable fixing of the test piece clamp 5; the connecting flat plate 32 is arranged at the same level with the bottom end of the outer side of the clamping panel body 31 and is vertically arranged with the clamping panel body 31; the stiffening plates 34 are equidistantly distributed between the connecting flat plate 32 and the clamping panel body 31, and the connecting flat plate 34 is fixedly connected with the excitation mechanism through bolts.
In this embodiment 1, the observation window panel 4 is rotatably disposed at the second end opening of the temperature control box 1; the observation window panel 4 is connected with one of the side plates by adopting a hinge mechanism, and the hinge mechanism is arranged in a hinge groove at the second end of the side plate and is connected with a threaded hole in the hinge groove by a bolt; the center of the observation window panel 4 is provided with a visual observation window body for observing the internal test process of the temperature control box 1.
In this embodiment 1, the specimen holder 5 includes a cylindrical fixing portion 51, a semi-cylindrical clamping portion 52, and a specimen pressing block 53; the cylindrical fixing part 51 is matched and arranged in the circular arc-shaped groove; wherein a first end of the cylindrical fixing portion 51 is in close contact with an inner surface of the chucking panel body 31, and an outer circumferential surface of the cylindrical fixing portion 51 is in close contact with an inner circumferential surface of the cylindrical groove; the semi-cylindrical clamping part 52 is concentrically fixed at the second end of the cylindrical fixing part 51, and a rectangular groove 54 is arranged at the center of the rectangular bottom surface of the semi-cylindrical clamping part 52; the test piece pressing block 53 is arranged in the rectangular groove 54 in a matched mode, and the test piece 6 to be tested is clamped between the test piece pressing block 53 and the rectangular groove 54.
Specifically, the test piece fixture 5 includes a cylindrical fixing portion 51 and a semi-cylindrical clamping portion 52 that are sequentially connected, a rectangular groove 54 is formed in the center of the rectangular bottom surface of the semi-cylindrical clamping portion 52, and a fixing bolt hole is formed in the bottom of the rectangular groove 54, so as to fix the test piece 6 to be tested through a bolt; the cylindrical fixing portion 51 is provided with a plurality of bolt through holes, and the plurality of bolt through holes are distributed in a circular array and are arranged in one-to-one correspondence with the bolt holes on the clamping panel body 31; the test piece pressing block 53 is a rectangular block with holes, the size of the test piece pressing block 53 is matched with the size of the rectangular groove 54, and the depth of the rectangular groove 54 is equal to the sum of the thicknesses of the test piece pressing block 53 and the test piece 6 to be tested.
In this embodiment 1, the test piece 6 to be tested has a flat plate structure, and includes a clamping section 61 and a test section 62 that are axially connected in sequence; circular arc-shaped necking structures are symmetrically arranged on two sides of the clamping section 61, and a circular through hole 63 is formed in the center of the end part of the clamping section 61; a fixing bolt hole is formed in the bottom of the rectangular groove 54, and a through hole 55 is formed in the center of the test piece pressing block 53; the through holes 55, the circular through holes 63 and the fixing bolt holes are arranged in a penetrating manner from top to bottom and have the same size; and a fixing bolt sequentially penetrates through the through hole 55, the circular through hole 63 and the fixing bolt hole so as to fix the test piece pressing block 53, the test piece 6 to be tested and the semi-cylindrical clamping part 52 together.
In this embodiment 1, the carrying platform 7 includes a carrying platform 71 and four mutually independent lifting legs 72; the bearing table top 71 is horizontally arranged below the bottom surface of the temperature control box 1, and the upper surface of the bearing table top 71 is fixed with the bottom surface of the temperature control box 1 through the connecting sheet 7; the four lifting legs 72 are symmetrically arranged below the lower surface of the bearing table 71 and are uniformly arranged at four corners of the bearing table 71.
Specifically, the carrying platform 71 has a rectangular flat plate structure; four bolt holes are respectively arranged at each corner of the bearing table top 71 and are used for being connected with the connecting sheet 15 through bolts so as to achieve the effect of being fixedly connected with the temperature control box 1; the lifting support leg 72 comprises a ratchet slide bar 73, a track bar 74, a ratchet 75 and a pin; the ratchet slide bar 73 and the track bar 74 are vertically arranged up and down, the ratchet 75 is rotatably arranged at the lower end of the ratchet slide bar 73 through a pin, and the side surface of the ratchet 75 is matched and connected with the upper end of the track bar 74.
The ratchet slide bar 73 is a rectangular bar with a variable cross section, a groove for installing the ratchet 75 is formed at the small cross section end of the ratchet slide bar 73, and two pairs of pin through holes are symmetrically formed on the side surface of the groove; the center of the ratchet wheel 75 is provided with a center hole, the circumference of the ratchet wheel 75 is provided with stop holes, and the stop holes are positioned on gear teeth of the ratchet wheel 75 and are uniformly distributed along the circumference; a pair of pin through holes for fixing the center of the ratchet 75 by pins to support the rotation of the ratchet 75; the other pair of pin through holes is used to fix the stopper hole on the ratchet 75 by the pin to restrict the rotation of the ratchet 75.
The track rod 74 is also a rectangular rod with a variable cross section, and a rectangular sleeve is arranged at the small cross section end of the track rod 74 and used for limiting the movement of the ratchet slide rod 73 in the horizontal direction, so that the formed lifting support leg only moves in the vertical direction; and a rack structure is provided on the inner side of the small section end of the track rod 74, and the rack structure is used for meshing with the ratchet wheel to move.
The width of the ratchet wheel 75 is matched with the width of the rack structure, and the ratchet wheel 75 is meshed with the rack structure, so that the vertical upgrading function of the bearing platform 7 can be realized; the function of resting on a certain height is achieved by providing a stop hole on each tooth of the ratchet 75 for the insertion of a locating pin, thus limiting the rotation of the ratchet.
The working principle and the test method are as follows:
when a vibration fatigue test is performed using the vibration fatigue test apparatus for realizing a gradient temperature field described in this embodiment 1, the following is specific:
firstly, fixing a high-temperature furnace on a bearing platform through a connecting sheet, respectively pulling out positioning pins of the bearing platform, adjusting the height of the bearing platform to be the same as the table top height of an excitation mechanism through lifting supporting legs, and then inserting the positioning pins into pin holes in a ratchet wheel and a ratchet wheel slide rod to fix the height of the bearing platform.
Then, fixing the connecting flat plate on the table top of the excitation mechanism by using bolts; and placing the clamping section of the test piece to be tested into the rectangular groove of the semicircular column type clamping part, pressing the test piece pressing block, and screwing the test piece pressing block into the bolt hole of the test piece to be tested and the semicircular column type clamping part by using a bolt to finish clamping the test piece.
Then, opening a laser incidence window and an observation window panel, installing a test piece clamp for clamping a test piece into a fixed circular ring on the inner side of the test piece clamping panel, and after adjusting the angle of the test piece clamp, fixedly installing the test piece clamp on the inner side of the clamping panel body.
Then, covering quartz glass of the laser incident window, fixedly mounting the quartz glass on a temperature control box through a glass cover plate, and closing the observation window panel; the amplitude of the free end of the test piece is acquired and monitored in real time by using a blue laser displacement sensor; the laser displacement sensor is arranged right above the laser incidence window, so that laser is incident on a test piece in the furnace, and the distance between a laser monitoring point and the free end of the test piece is adjusted to be 1-2 mm; thus, the installation of the equipment and the test piece is completed.
And finally, setting a target temperature value of the test through a temperature control panel of the temperature control box, and starting an excitation mechanism when the internal temperature of the hearth reaches a set value, so that the vibration fatigue test under the gradient temperature field can be performed.
It should be noted that, in the test process of embodiment 1, the high temperature furnace may be divided into two parts according to the motion state of the parts, one part is a test piece clamping panel for clamping the test piece and moving up and down along with the vibration table, and the other part is a static temperature control box part for providing an uneven temperature field for the test piece; the two parts are a track sliding mechanism formed by two track bulges on the inner side of the clamping panel body and a groove structure on the end surface of the temperature control box; in the high-temperature vibration test process, high-temperature lubricating grease can be injected into the track sliding mechanism so as to achieve the purpose of reducing friction coefficient in the movement process, so that stability in the test process is improved, and positive promotion effect is achieved on further improving the test accuracy.
Because the traditional high-temperature furnace cage clamp and the test piece have obvious heat loss in a heating mode, an additional water cooling device is needed to cool the high-temperature exposed parts such as the clamp body, the high-temperature furnace floor and the like. Not only can cause a large amount of heat loss, but also greatly improves the complexity of the equipment and reduces the reliability of the equipment in the use process. In order to simplify the design of the equipment and improve the heating efficiency of the equipment; in this embodiment 1, the fixture is embedded into the high-temperature furnace, and the closed structure does not cause heat loss, so that the device does not need an additional water cooling device to cool. The reliability of the equipment in the test process is effectively improved, and the extra energy loss of the vibration test is reduced.
Secondly, the temperature field used by the related high temperature vibration technology at present cannot provide a high temperature field with a temperature gradient, and more conventional vibration tests are performed at room temperature; in the embodiment 1, a non-equidistant hearth structure and a spiral resistance wire with gradually increased pitch and diameter are adopted in a heating structure, so that a stable high-temperature field with temperature gradient is provided for a vibration test; therefore, the simulation of the real working environment of the turbine blade of the aero-engine is realized, and the design purpose of performing vibration fatigue test on the test piece under the uneven temperature field is achieved; in addition, through the rotation of the clamp and the fixation of the bolt, the vibration test of the test piece under different clamping angles can be realized, the selection range of the clamping angles in the test piece vibration fatigue test process is improved, and the test content of the high-temperature vibration fatigue test is enriched.
In the embodiment 1, the temperature control box is fixedly connected with the lifting bearing table through bolts so as to achieve the purpose of randomly adjusting the working height of the high-temperature furnace; the temperature control box comprises a non-equidistant hearth and a plurality of electric heating elements, so as to generate an uneven temperature field around a test piece; the test piece clamping surface of the temperature control box is fixedly connected with the vibrating table through a flat plate structure with holes at the bottom by bolts so as to realize the transmission of exciting force to the test piece; the blue laser displacement sensor is injected into the hearth through an incidence window at the top of the high-temperature furnace, and monitors the amplitude of the free end of the test piece clamped in the hearth; the vibration fatigue test device and the vibration fatigue test method of the embodiment 1 realize the generation of an uneven temperature field in a high-temperature vibration fatigue test and are suitable for researching the vibration response of a test piece in different excitation directions; the test piece clamping device is convenient to clamp, has a simple structure, and can be directly used for a vibration test bed of a common model; no additional opening is needed to be carried out on the equipment, and no additional water cooling circulation system is needed to be added to the equipment; the device is simple to operate in the test process and high in reliability, so that the purposes of turbine blade vibration response and vibration fatigue life test under different excitation directions can be obtained in a high-temperature vibration test, and the defects and the shortcomings in the prior art are overcome.
Example 2
As shown in fig. 17, the vibration fatigue testing device for implementing a gradient temperature field according to embodiment 2 is different from the basic box of the structure and principle of the vibration fatigue testing device for implementing a gradient temperature field according to embodiment 1 described above in that:
in the embodiment 2, the test piece clamping panel 3 is connected with the temperature control box 1 by adopting a hinge structure, a bearing platform is not arranged at the bottom of the temperature control box 1, and the temperature control box 1 is fixed on the table top of the excitation mechanism through the connecting sheet and vibrates together with the excitation mechanism; the rest of the structure of embodiment 2 is the same as that of embodiment 1, and will not be described here again.
When a vibration fatigue test is performed using the vibration fatigue test apparatus for realizing a gradient temperature field described in this embodiment 2, the following is specific:
first, the high temperature furnace is fixed on the table top of the excitation mechanism through the connecting sheet.
Then, opening the test piece clamping panel, and detaching a test piece clamp on the test piece clamping panel; and placing the clamping section of the test piece to be tested into the rectangular groove of the semicircular column type clamping part, pressing the test piece pressing block, and screwing the test piece pressing block into the bolt hole of the test piece to be tested and the semicircular column type clamping part by using a bolt to finish clamping the test piece.
And then, installing a test piece clamp for clamping the test piece into the fixed ring at the inner side of the test piece clamping panel, and after adjusting the angle of the test piece clamp, fixedly installing the test piece clamp at the inner side of the clamping panel body.
Then, the specimen holding panel and the observation window panel are closed. The method comprises the steps of using a blue laser displacement sensor to collect and monitor real-time data of the amplitude of a free end of a test piece to be tested; the laser displacement sensor is arranged right above the laser incidence window, so that laser is incident on a test piece in the furnace, and the distance between a laser monitoring point and the free end of the test piece is adjusted to be 1-2 mm; thus, the equipment and the test piece are installed, and the equipment and the test piece are installed.
And finally, setting a target temperature value of the test through a temperature control panel of the temperature control box, and starting the vibration table when the internal temperature of the hearth reaches a set value, so that the vibration fatigue test under the gradient temperature field can be performed.
Example 3
As shown in fig. 18, embodiment 3 provides a high-temperature vibration fatigue test system, which comprises a vibration fatigue test device, a vibration controller, a power amplifier, a cooling unit and an acceleration sensor 9; wherein the vibration fatigue test device adopts the vibration fatigue test device for realizing the gradient temperature field as described in the embodiment 2, and in the vibration fatigue test device for realizing the gradient temperature field, the excitation mechanism adopts an electric vibration test stand; the vibration fatigue test system is formed into a closed loop system through a laser displacement sensor 8 and an acceleration sensor 9; in the testing process, the PC is utilized to run vibration test control interface software to realize man-machine interaction functions such as compiling of input load; the laser displacement sensor 8 and the acceleration sensor 9 respectively collect acceleration signals of the electric vibration test bed and displacement signals of the free end of the test piece; the collected vibration signals are fed back to the vibration controller; after the signals are analyzed and processed, the signals are compared with the set test targets, and the driving signals are corrected in a real-time closed loop mode so as to ensure that the vibration of the vibration table is consistent with the set test targets.
In the test process, the test piece to be tested in the vibration fatigue test device for realizing the gradient temperature field described in the embodiment 2 vibrates along with the electric vibration test bed; in a high-temperature vibration fatigue test, the vibration frequency of an electric vibration test bed is excited near the first-order natural frequency of a test piece to be tested; when the first-order natural frequency of the vibration fatigue test device is designed to be remarkably different from the first-order natural frequency of the test piece, and when the excitation frequency of the electric vibration test reaches the vicinity of the first-order natural frequency of the test piece to be tested, the excessive vibration response of a high-temperature furnace in the vibration fatigue test device is avoided, so that the test purpose that the test piece to be tested vibrates at the vicinity of the first-order natural frequency under the high-temperature condition is achieved; specifically, the first-order natural frequency of the vibration fatigue test device and the first-order natural frequency of the test piece to be tested are designed in a different mode, namely the first-order natural frequency of the vibration fatigue test device and the first-order natural frequency of the test piece to be tested are obviously different and do not have intersection; when the excitation frequency of the electric vibration test bed reaches the first-order natural frequency of the test piece to be tested, the vibration fatigue test device is not caused to generate resonance phenomenon, and the test purpose that the test piece to be tested vibrates near the first-order natural frequency under the high-temperature condition is achieved.
Therefore, the simulation of the non-uniform temperature field in the actual working condition of the turbine blade can be realized, and the fatigue life and vibration response of the test piece under the high-temperature condition can be measured; the rotatable test piece clamp is used for clamping the test piece to be tested at different angles, so that the vibration fatigue life and vibration response of the test piece to be tested in different excitation directions can be realized; because the temperature control box is strong in integrity, and the equipment is not provided with the open through holes for the fixture to be inserted, an additional water cooling module is not needed for circularly cooling the fixture body or the vibrating table, the reliability of the test is greatly improved, and the complexity of the equipment structure and the energy loss are reduced. In the actual use process, the operation process is simple, the test working efficiency can be greatly improved, and the test cost can be reduced.
The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. The vibration fatigue test device for realizing the gradient temperature field is characterized by comprising a high-temperature furnace, a test piece (6) to be tested and an excitation mechanism; the excitation mechanism is used for providing excitation force and transmitting the excitation force to a test piece (6) to be tested through the high-temperature furnace;
the high-temperature furnace comprises a temperature control box (1), a hearth (2), a test piece clamping panel (3), an observation window panel (4) and a test piece clamp (5); the temperature control box (1) is of a box-shaped structure with two open ends and is hollow, and the hearth (2) is embedded in the temperature control box (1); wherein the hearth (2) is used for forming a gradient temperature field in the temperature control box (1);
the test piece clamping panel (3) is arranged at the opening of the first end of the temperature control box (1) in a matched mode, and the observation window panel (4) is arranged at the opening of the second end of the temperature control box (1) in a matched mode; the test piece clamp (5) is rotatably arranged on the inner side of the test piece clamping panel (3), one end of the test piece (6) to be tested is clamped and fixed on the test piece clamp (5), and the other end of the test piece (6) to be tested extends to the inside of the temperature control box (1); the outer side of the test piece clamping panel (3) or the bottom of the temperature control box (1) is connected with the excitation mechanism.
2. The vibration fatigue test device for realizing a gradient temperature field according to claim 1, wherein the temperature control box (1) comprises a top plate (11), two side plates (12) and a bottom plate (13); the top plate (11) and the bottom plate (13) are arranged in parallel up and down, and the two side plates (12) are vertically arranged between the top plate (11) and the bottom plate (13) in parallel; a laser incidence window (14) is formed in the top plate (11), and quartz glass is adopted at the laser incidence window (14) for covering and sealing; the outside of the laser incidence window (14) is provided with a laser displacement sensor, and the laser incidence window (14) is used for radiating laser beams emitted by the laser displacement sensor into the temperature control box (1).
3. The vibration fatigue test device for realizing a gradient temperature field according to claim 1, wherein the furnace (2) comprises a furnace body (21) and a resistance wire (22), and the resistance wire (22) is arranged in the furnace body (21);
the hearth body (21) is an enclosed non-equidistant hearth or a single-sided non-equidistant hearth;
the surrounding type non-equidistant hearth is of a hollow rectangular block structure, and a truncated cone-shaped cavity is formed in the hollow rectangular block structure; the resistance wires (22) are embedded on the inner wall of the circular truncated cone-shaped cavity in a non-equidistant spiral arrangement mode;
the single-sided non-equidistant hearth is of a pentahedron structure with a right triangle cross section, and the resistance wires (22) are embedded on the inclined plane of the single-sided non-equidistant hearth in a periodic curve arrangement mode.
4. The vibration fatigue test device for realizing the gradient temperature field according to claim 1, wherein the test piece clamping panel (3) comprises a clamping panel body (31) and a fixed ring (33); the clamping panel body (31) is vertically arranged at the opening of the first end of the temperature control box (1), and the fixed ring (33) is fixedly arranged at the center of the inner side of the clamping panel body (31); the inner arc surface of the fixed ring (33) and the inner surface of the clamping panel body (31) are surrounded to form a cylindrical groove, and the test piece clamp (5) is rotatably arranged in the cylindrical groove.
5. The vibration fatigue test device for realizing a gradient temperature field according to claim 4, wherein the test piece fixture (5) comprises a cylindrical fixing part (51), a semi-cylindrical clamping part (52) and a test piece pressing block (53);
the cylindrical fixing part (51) is matched and arranged in the circular arc-shaped groove; wherein a first end of the cylindrical fixing portion (51) is in close contact with an inner surface of the clamping panel body (31), and an outer circumferential surface of the cylindrical fixing portion (51) is in close contact with an inner circumferential surface of the cylindrical groove;
the semicircular column type clamping part (52) is concentrically fixed at the second end of the cylindrical fixing part (51), and a rectangular groove (54) is formed in the center of the rectangular bottom surface of the semicircular column type clamping part (52); the test piece pressing block (53) is arranged in the rectangular groove (54) in a matched mode, and the test piece (6) to be tested is clamped between the test piece pressing block (53) and the rectangular groove (54).
6. The vibration fatigue test device for realizing the gradient temperature field according to claim 5, wherein the test piece (6) to be tested is of a flat plate-shaped structure and comprises a clamping section (61) and a test section (62) which are axially connected in sequence; circular arc-shaped necking structures are symmetrically arranged on two sides of the clamping section (61), and a circular through hole (63) is formed in the center of the end part of the clamping section (61);
A fixed bolt hole is formed in the bottom of the rectangular groove (54), and a through hole (55) is formed in the center of the test piece pressing block (53); the through holes (55), the round through holes (63) and the fixing bolt holes are arranged in a penetrating manner from top to bottom; and the through hole (55), the circular through hole (63) and the fixing bolt hole are sequentially penetrated by a fixing bolt, so that the test piece pressing block (53), the test piece (6) to be tested and the semi-cylindrical clamping part (52) are fixed together.
7. A vibration fatigue testing device for realizing a gradient temperature field according to claim 3, wherein the specimen holding panel (3) further comprises a connecting flat plate (32) and a plurality of stiffening plates (34); the connecting flat plate (32) is horizontally arranged at the bottom end of the outer side of the clamping panel body (31), and a plurality of stiffening plates (34) are uniformly distributed between the connecting flat plate (32) and the clamping panel body (31); the connecting plate (32) is provided with a plurality of connecting bolt holes, and the connecting bolt holes are used for connecting the connecting plate (32) with the excitation mechanism by bolts.
8. The vibration fatigue test device for realizing the gradient temperature field according to claim 1, wherein a connecting sheet (15) is arranged on the bottom surface of the temperature control box (1), and the connecting sheet (15) is arranged at four corners of the bottom surface of the temperature control box (1); the connecting sheet (15) is used for fixedly connecting the temperature control box (1) with the excitation mechanism or the bearing platform (7).
9. The vibration fatigue test device for realizing the gradient temperature field according to claim 8, wherein the bearing platform (7) comprises a bearing table top (71) and four mutually independent lifting support legs (72);
the bearing table top (71) is horizontally arranged below the bottom surface of the temperature control box (1), and the upper surface of the bearing table top (71) is fixed with the bottom surface of the temperature control box (1) through the connecting sheet (15); the four lifting support legs (72) are symmetrically arranged below the lower surface of the bearing table top (71) and are uniformly distributed at four corners of the bearing table top (71).
10. A vibration fatigue test method for realizing a gradient temperature field, characterized in that a vibration fatigue test apparatus for realizing a gradient temperature field according to any one of claims 1-9 is utilized;
the vibration fatigue test method comprises the following steps:
fixing a test piece (6) to be tested in the test piece clamp (5), and then installing the test piece clamp (5) with the test piece (6) to be tested on the test piece clamping panel (3); then, connecting the temperature control box (1) or the test piece clamping panel (3) with an excitation mechanism; and finally, setting and waiting for the internal temperature of the hearth (2) to reach a target temperature value, and starting the excitation mechanism until the test is finished.
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|---|---|---|---|
| CN202310877309.8A CN116929687A (en) | 2023-07-17 | 2023-07-17 | Vibration fatigue test device and method for realizing gradient temperature field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310877309.8A CN116929687A (en) | 2023-07-17 | 2023-07-17 | Vibration fatigue test device and method for realizing gradient temperature field |
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