CN115326592A - Bending test device for large-scale complex structural part and installation method thereof - Google Patents
Bending test device for large-scale complex structural part and installation method thereof Download PDFInfo
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- CN115326592A CN115326592A CN202211051118.8A CN202211051118A CN115326592A CN 115326592 A CN115326592 A CN 115326592A CN 202211051118 A CN202211051118 A CN 202211051118A CN 115326592 A CN115326592 A CN 115326592A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
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Abstract
The invention discloses a bending test device for a large-scale complex structural member and an installation method thereof, wherein the bending test device comprises a test system bearing frame, a first load applying mechanism and a second load applying mechanism are arranged on the test system bearing frame, and the first load applying mechanism and the second load applying mechanism respectively comprise a sample bearing flange, a loading oil cylinder and a bending loading reaction frame. The invention discloses a bending test device for a large-scale complex structural member and an installation method thereof, wherein the device has good expansibility, can meet bending fatigue tests of complex structural member samples under different test forces, different load loading situations and different structural conditions, has wide application prospect and economic benefit, provides an important theoretical basis for comprehensive mechanical property research and fatigue property evaluation of the large-scale complex structural member, and ensures safe and reliable service of large-scale equipment.
Description
Technical Field
The invention relates to the technical field of material mechanical property testing, in particular to a bending test device for a large-scale complex structural member and an installation method thereof.
Background
With the increasing demand of China for fossil energy such as petroleum and natural gas, oceans become more and more important strategic targets of resource development, and the smooth development and utilization of ocean resources depend on the service performance and safety of ocean platforms to a great extent. The ocean platform is large in size, complex in structure, capable of bearing complex load and poor in service environment, so that the research on the fatigue performance of the key welding structure is beneficial to reasonable fatigue design of key fatigue dangerous positions, further accidents such as structural failure are avoided, and the safe service of the large ocean platform is guaranteed.
The large-scale complex structural part is often used in the environment with complex load and severe environment, so a reasonable and reliable test system needs to be built to effectively analyze the complex stress condition of the large-scale complex structural part, and reliable fatigue performance data is obtained, thereby ensuring the reasonability of fatigue design. At present, domestic loading tests mostly concentrate on conventional tension and compression loads and four-point bending loads, researches on a biaxial bending loading test system with a complex structure are less, and particularly, few reports are provided on the test system with the test force reaching 20000kN level on the basis. The reason is that a device and a method for performing a bending test on a large complex structural member are lacked at present, and a bending load loading method cannot be improved.
Disclosure of Invention
The invention aims to provide a bending test device for a large-scale complex structural member and an installation method thereof, which are used for solving the problem that the bending load loading method cannot be improved due to the lack of a bending test device and a bending test method for the large-scale complex structural member at present.
The invention provides a bending test device for a large-scale complex structural part, which is used for performing a bending test on a structural sample to be tested and comprises a test system bearing frame, wherein a first load applying mechanism and a second load applying mechanism are arranged on the test system bearing frame, the first load applying mechanism and the second load applying mechanism respectively comprise a sample bearing flange, a loading oil cylinder and a bending loading reaction frame, the structural sample to be tested is a cube, and the structural sample to be tested is arranged on the test system bearing frame; sample bearing flanges of the first load applying mechanism and the second load applying mechanism are respectively arranged on two adjacent side surfaces of the structural sample to be tested; the bending loading reaction frame of the first load applying mechanism and the bending loading reaction frame of the second load applying mechanism are respectively arranged right in front of the side face of the structural sample to be tested, where the corresponding sample bearing flange is located; two ends of a loading oil cylinder of the first load applying mechanism are respectively connected with a sample bearing flange and a bending loading reaction frame of the first load applying mechanism, and two ends of a loading oil cylinder of the second load applying mechanism are respectively connected with a sample bearing flange and a bending loading reaction frame of the second load applying mechanism; and the loading oil cylinders of the first load applying mechanism and the second load applying mechanism are respectively connected with the test system through wires.
Preferably, the bending loading reaction frame comprises a horizontal bottom plate, a rectangular vertical plate and two triangular reinforcing plates, the rectangular vertical plate is vertically welded at the outer end of the horizontal bottom plate, the two triangular reinforcing plates are respectively arranged at two sides of the horizontal bottom plate, two edges of the triangular reinforcing plate are respectively welded with the outer parts of the horizontal bottom plate and the rectangular vertical plate, and the horizontal bottom plate, the rectangular vertical plate and the two triangular reinforcing plates are jointly welded and combined into the bending loading reaction frame with an upper opening and a side opening.
Preferably, the horizontal bottom plate and the rectangular vertical plate are made of high-strength steel plates.
Preferably, the bottom of the horizontal bottom plate of the bending loading reaction frame is provided with a plurality of bending loading reaction frame key grooves for bearing lateral shearing force.
Preferably, the horizontal bottom plate and the rectangular vertical plate of the bending loading reaction frame are provided with a plurality of bending loading reaction frame threaded holes for penetrating bolts to connect with the end part of the loading oil cylinder; and two ends of the loading oil cylinders of the first load applying mechanism and the second load applying mechanism are respectively connected to the corresponding sample bearing flange and the bending loading reaction frame through bolts.
Preferably, the first load applying mechanism and the second load applying mechanism are longitudinally and mutually vertically installed on two adjacent side surfaces of the structural sample to be tested, and the vertical loading on the two adjacent side surfaces of the structural sample to be tested is realized through a loading bending loading reaction frame.
Preferably, the loading oil cylinder of the first load applying mechanism and the loading oil cylinder of the second load applying mechanism work independently or simultaneously, and under the cooperation of a test system, a uniaxial bending and biaxial bending composite loading test can be realized under different waveform loading conditions.
The invention also discloses an installation method of the bending test device for the large-scale complex structural part, which comprises the following steps:
the bending loading reaction frames of the first load applying mechanism and the second load applying mechanism are respectively fixed on a bearing frame of the test system through a plurality of bending loading reaction frame threaded holes pre-tightening bolts on the horizontal bottom plate;
the bending loading reaction frames of the first load applying mechanism and the second load applying mechanism are fixedly connected with corresponding loading oil cylinders through a plurality of bending loading reaction frame threaded hole pre-tightening bolts on the rectangular vertical plate;
determining the levelness of the bending loading reaction frame of the first load applying mechanism and the second load applying mechanism relative to the bearing frame of the test system and the verticality of the bending loading reaction frame of the second load applying mechanism relative to the side surface of the test sample of the structure to be tested by using a level gauge, and respectively locking bolts of the first load applying mechanism and the second load applying mechanism if the levelness and the verticality meet requirements;
welding a sample bearing flange on the side surface of the structural sample to be tested at a position corresponding to the loading plate of the loading oil cylinder, and fixedly connecting the sample and the loading oil cylinder through a locking bolt;
under the cooperation of the loading oil cylinder, the bending loading reaction frame rotates properly relative to the sample bearing flange, and the application direction of the bending moment of the structural sample to be tested is adjusted, so that the multi-angle bending load is applied.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention discloses a bending test device for a large-scale complex structural member, which has the bending test capability of a structural sample to be tested under the condition of large bearing capacity through firm connection between a bending loading reaction frame and a loading oil cylinder as well as between the bending loading reaction frame and a bearing frame of a test system. Through the matching of the bending loading reaction frame and the bending loading oil cylinders and the independent or synergistic action of the two groups of loading oil cylinders, the uniaxial bending and biaxial bending composite loading fatigue test of the structural sample to be tested under the condition of vertical or different angles can be realized.
(2) The invention discloses an installation method of a bending test device for a large-scale complex structural member, which is safe, reliable, stable in performance and accurate in measurement, and is beneficial to realizing a fatigue test of the large-scale complex structural member under a complex load condition, so that the comprehensive mechanical behavior characteristics of the large-scale complex structural member are obtained, reliable data support is provided for the performance research and the fatigue design of the large-scale complex structural member, guidance is provided for the fatigue design of the large-scale complex structural member, the fatigue performance of a large-scale welding structure under the complex load condition is ensured, and theoretical guidance is provided for the fatigue design of the complex structural member of an ocean platform.
(3) The invention discloses a bending test device for a large-scale complex structural member and an installation method thereof, wherein the device has good expansibility, can meet bending fatigue tests of complex structural member samples under different test forces, different load loading situations and different structural conditions, has wide application prospect and economic benefit, provides an important theoretical basis for comprehensive mechanical property research and fatigue property evaluation of the large-scale complex structural member, and ensures safe and reliable service of large-scale equipment.
Drawings
Fig. 1 is a top view of a bending test apparatus for a large complex structural member provided in embodiment 1 of the present invention;
fig. 2 is a side view of a first load applying mechanism provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a bending loading reaction frame provided in embodiment 1 of the present invention.
Description of reference numerals: 1-a test system bearing frame, 2-a first load applying mechanism, 3-a second load applying mechanism, 41-a sample bearing flange, 42-a loading oil cylinder and 43-a bending loading reaction frame; 430-bending loading reaction frame threaded hole, 431-bending loading reaction frame key groove; 100-structural sample to be tested.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In order to solve the problem that the bending test device and method aiming at the large-scale complex structural member are lacked at present and the loading method of the bending load cannot be improved, the invention discloses a bending test device and an installation method of the large-scale complex structural member, and the bending test device has the bending test capability of a structural sample 100 to be tested under the condition of large bearing capacity through firm connection between a bending loading reaction frame 43, a loading oil cylinder 42 and a test system bearing frame; through the matching of the bending loading reaction frame 43 and the bending loading oil cylinders 42 and the independent or synergistic action of the two groups of loading oil cylinders 42, the uniaxial bending and biaxial bending composite loading fatigue test of the structural sample 100 to be tested under the condition of being vertical or different angles can be realized.
Example 1
Referring to fig. 1 and 2, the bending test device for large-scale complex structural members comprises a test system bearing frame 1, wherein a first load applying mechanism 2 and a second load applying mechanism 3 are arranged on the test system bearing frame 1,
the first load applying mechanism 2 and the second load applying mechanism 3 each comprise a sample bearing flange 41, a loading cylinder 42, a bending loading reaction frame 43,
the structural sample 100 to be tested is a cube, and the structural sample 100 to be tested is arranged on the bearing frame 1 of the test system;
the sample bearing flanges 41 of the first load applying mechanism 2 and the second load applying mechanism 3 are respectively arranged on two adjacent side surfaces of the structural sample 100 to be tested;
the bending loading reaction frame 43 of the first load applying mechanism 2 and the bending loading reaction frame 43 of the second load applying mechanism 3 are respectively arranged right in front of the side face of the structural sample 100 to be tested where the corresponding sample bearing flange 41 is located;
two ends of a loading oil cylinder 42 of the first load applying mechanism 2 are respectively connected with a sample bearing flange 41 and a bending loading reaction frame 43 of the first load applying mechanism 2, and two ends of a loading oil cylinder 42 of the second load applying mechanism 3 are respectively connected with a sample bearing flange 41 and a bending loading reaction frame 43 of the second load applying mechanism 3;
the test system is arranged in the test system bearing frame 1, and the loading oil cylinders 42 of the first load applying mechanism 2 and the second load applying mechanism 3 are respectively connected with the test system through wires.
The bottom end of the structural sample 100 to be tested is fixed on the test system bearing frame 1 through four shafts, the loading oil cylinder 42 applies push-pull force, and the bending loading reaction frame 43 applies bending load to the structural sample 100 to be tested.
Referring to fig. 3, the bending loading reaction frame 43 includes a horizontal bottom plate, a rectangular vertical plate and two triangular reinforcing plates, the rectangular vertical plate is vertically welded at the outer end of the horizontal bottom plate, the two triangular reinforcing plates are respectively disposed at two sides of the horizontal bottom plate, two sides of the triangular reinforcing plate are respectively welded with the outside of the horizontal bottom plate and the outside of the rectangular vertical plate, and the horizontal bottom plate, the rectangular vertical plate and the two triangular reinforcing plates are jointly welded and combined to form the bending loading reaction frame 43 with an open upper side and an open side.
The bending loading reaction frame 43 is formed by welding and processing a high-strength steel plate, and specifically, the horizontal bottom plate and the rectangular vertical plate are high-strength steel plates.
Specifically, the bottom of the horizontal bottom plate of the bending load reaction frame 43 is machined with a plurality of bending load reaction frame keyways 431 for bearing lateral shear forces.
More specifically, the horizontal bottom plate and the rectangular vertical plate of the bending loading reaction frame 43 are provided with a plurality of bending loading reaction frame threaded holes 430 for penetrating bolts to connect with the end of the loading oil cylinder 42; two ends of the loading oil cylinder 42 of the first load applying mechanism 2 and the second load applying mechanism 3 are respectively connected to the corresponding sample bearing flange 41 and the bending loading reaction frame 43 through bolts.
As a specific embodiment, a plurality of bending loading reaction frame threaded holes 430 with the same size are processed on the horizontal bottom plate of the bending loading reaction frame 43 for installing bolts; specifically, the number of bending load reaction frame threaded holes 430 on the horizontal floor of the bending load reaction frame 43 is 20.
As a specific embodiment, a plurality of bending loading reaction frame threaded holes 430 with the same size are machined on the rectangular vertical plate of the bending loading reaction frame 43 for installing bolts. Specifically, the number of bending loading reaction frame threaded holes 430 on the rectangular riser of the bending loading reaction frame 43 is 12.
More specifically, the side of the structural sample 100 to be tested includes four vertical plates, wherein two adjacent vertical plates are fixed with the sample bearing flange 41, and the structural sample 100 to be tested is arranged on the test system bearing frame 1 through the two vertical plates.
The first load applying mechanism 2 and the second load applying mechanism 3 are vertically and mutually perpendicular to each other on two adjacent side surfaces of the structural sample 100 to be tested, and the vertical loading on the two adjacent side surfaces of the structural sample 100 to be tested is realized through the loading bending loading reaction frame 43.
Further, the loading oil cylinder 42 of the first load applying mechanism 2 and the loading oil cylinder 42 of the second load applying mechanism 3 work independently or simultaneously, and under the cooperation of a test system, a uniaxial bending and biaxial bending composite loading test can be realized under different waveform loading conditions.
Example 2
the bending loading reaction frame 43 of the first load applying mechanism 2 and the second load applying mechanism 3 is respectively fixed on the bearing frame 1 of the test system through a plurality of bending loading reaction frame threaded holes 430 pre-tightening bolts on the horizontal bottom plate;
the bending loading reaction frame 43 of the first load applying mechanism 2 and the second load applying mechanism 3 is fixedly connected with the corresponding loading oil cylinder 42 through a plurality of bending loading reaction frame threaded holes 430 pre-tightening bolts on the rectangular vertical plate;
determining the levelness of the bending loading reaction frame 43 of the first load applying mechanism 2 and the second load applying mechanism 3 relative to the test system bearing frame 1 and the verticality of the side surface of the structural sample 100 to be tested by using a level gauge, and respectively locking bolts of the first load applying mechanism 2 and the second load applying mechanism 3 if the levelness and the verticality meet requirements;
welding a sample bearing flange 41 on the side surface of the structural sample 100 to be tested at a position corresponding to a loading plate of a loading oil cylinder 42, and fixedly connecting a sample 4 and the loading oil cylinder 42 through a locking bolt;
under the coordination of the loading oil cylinder 42, the bending loading reaction frame 43 rotates properly relative to the sample bearing flange 41, and the application direction of the bending moment of the structural sample 100 to be tested is adjusted, so that the multi-angle bending load is applied.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (8)
1. A bending test device for a large-scale complex structural member is used for performing a bending test on a structural sample (100) to be tested and is characterized by comprising a test system bearing frame (1),
the testing system is characterized in that a first load applying mechanism (2) and a second load applying mechanism (3) are arranged on the testing system bearing frame (1), the first load applying mechanism (2) and the second load applying mechanism (3) respectively comprise a sample bearing flange (41), a loading oil cylinder (42) and a bending loading reaction frame (43),
the structure sample to be tested (100) is a cube, and the structure sample to be tested (100) is arranged on the bearing frame (1) of the test system;
sample bearing flanges (41) of a first load applying mechanism (2) and a second load applying mechanism (3) are respectively arranged on two adjacent side surfaces of the structural sample (100) to be tested;
the bending loading reaction frame (43) of the first load applying mechanism (2) and the bending loading reaction frame (43) of the second load applying mechanism (3) are respectively arranged right in front of the side face of the structural sample (100) to be tested, where the corresponding sample bearing flange (41) is located;
two ends of a loading oil cylinder (42) of the first load applying mechanism (2) are respectively connected with a sample bearing flange (41) and a bending loading reaction frame (43) of the first load applying mechanism (2), and two ends of a loading oil cylinder (42) of the second load applying mechanism (3) are respectively connected with a sample bearing flange (41) and a bending loading reaction frame (43) of the second load applying mechanism (3);
and a test system is arranged in the test system bearing frame (1), and the loading oil cylinders (42) of the first load applying mechanism (2) and the second load applying mechanism (3) are respectively connected with the test system through wires.
2. The bending test device for large-scale complex structural members according to claim 1,
the bending loading reaction frame (43) comprises a horizontal bottom plate, a rectangular vertical plate and two triangular reinforcing plates, the rectangular vertical plate is vertically welded at the outer end of the horizontal bottom plate, the two triangular reinforcing plates are respectively arranged at two sides of the horizontal bottom plate, two edges of the triangular reinforcing plate are respectively welded with the outer parts of the horizontal bottom plate and the rectangular vertical plate, and the horizontal bottom plate, the rectangular vertical plate and the two triangular reinforcing plates are jointly welded and combined into the bending loading reaction frame (43) with an upper opening and a side opening.
3. The bending test device for large-scale complex structural members according to claim 2,
the horizontal bottom plate and the rectangular vertical plate are high-strength steel plates.
4. The large-scale complex structural member bending test device according to claim 2,
the bottom of the horizontal bottom plate of the bending loading reaction frame (43) is provided with a plurality of bending loading reaction frame key grooves (431) for bearing lateral shearing force.
5. The bending test device for large-scale complex structural members according to claim 2,
a horizontal bottom plate and a rectangular vertical plate of the bending loading reaction frame (43) are provided with a plurality of bending loading reaction frame threaded holes (430) for penetrating bolts to connect with the end part of the loading oil cylinder (42);
and the two ends of the loading oil cylinders (42) of the first load applying mechanism (2) and the second load applying mechanism (3) are respectively connected to the corresponding sample bearing flange (41) and the bending loading reaction frame (43) through bolts.
6. The bending test device for large-scale complex structural members according to claim 2,
the longitudinal mutually vertical installation of the first load applying mechanism (2) and the second load applying mechanism (3) is arranged on two adjacent side surfaces of the structural sample (100) to be tested, and the vertical loading of the two adjacent side surfaces of the structural sample (100) to be tested is realized through the loading bending loading reaction frame (43).
7. The large-scale complex structural member bending test device according to claim 6,
the loading oil cylinder (42) of the first load applying mechanism (2) and the loading oil cylinder (42) of the second load applying mechanism (3) work independently or simultaneously, and under the cooperation of a test system, a single-shaft bending and double-shaft bending combined loading test can be realized under different waveform loading conditions.
8. The installation method of the large-scale complex structural part bending test device according to any one of claims 2 to 7, characterized by comprising the following steps:
the bending loading reaction frames (43) of the first load applying mechanism (2) and the second load applying mechanism (3) are respectively fixed on the bearing frame (1) of the test system through a plurality of bending loading reaction frame threaded holes (430) on the horizontal bottom plate by pre-tightening bolts;
bending loading reaction frames (43) of the first load applying mechanism (2) and the second load applying mechanism (3) are fixedly connected with corresponding loading oil cylinders (42) through a plurality of pre-tightening bolts of bending loading reaction frame threaded holes (430) on the rectangular vertical plates;
determining the levelness of a bending loading reaction frame (43) of the first load applying mechanism (2) and the second load applying mechanism (3) relative to a bearing frame (1) of the test system and the verticality of the bending loading reaction frame relative to the side surface of a structural sample (100) to be tested by using a level gauge, and respectively locking bolts of the first load applying mechanism (2) and the second load applying mechanism (3) if the levelness and the verticality meet requirements;
a sample bearing flange (41) is welded on the side surface of the structural sample (100) to be tested at a position corresponding to a loading plate of a loading oil cylinder (42), and the sample (4) is fixedly connected with the loading oil cylinder (42) through a locking bolt;
under the coordination of the loading oil cylinder (42), the bending loading reaction frame (43) rotates properly relative to the sample bearing flange (41), and the application direction of the bending moment of the structural sample (100) to be tested is adjusted, so that the multi-angle bending load is applied.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116718497A (en) * | 2023-07-17 | 2023-09-08 | 天津大学 | Mechanical property testing device for special-shaped node sample |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116718497A (en) * | 2023-07-17 | 2023-09-08 | 天津大学 | Mechanical property testing device for special-shaped node sample |
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