CN113514354A - Device and method for measuring fretting fatigue strength of press-fitting structure - Google Patents
Device and method for measuring fretting fatigue strength of press-fitting structure Download PDFInfo
- Publication number
- CN113514354A CN113514354A CN202110621003.7A CN202110621003A CN113514354A CN 113514354 A CN113514354 A CN 113514354A CN 202110621003 A CN202110621003 A CN 202110621003A CN 113514354 A CN113514354 A CN 113514354A
- Authority
- CN
- China
- Prior art keywords
- sample
- press
- clamping
- lantern ring
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 238000009661 fatigue test Methods 0.000 claims description 25
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 239000011888 foil Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- 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
- G01N3/02—Details
- G01N3/04—Chucks
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device and a method for measuring the fretting fatigue strength of a press-mounting structure, wherein the device comprises a clamping mechanism, a lantern ring, a supporting mechanism and a contact pressure stress adjusting part; the supporting mechanism is provided with a unthreaded hole, and a threaded section of the test sample penetrates through the unthreaded hole to be matched with the contact pressure stress adjusting piece; the lantern ring and the conical section of the sample have the same conicity, the lantern ring is used for being matched with the conical section of the sample, and the lantern ring is connected with the supporting mechanism through a fastener; the clamping mechanism is used for clamping the clamping section of the sample. Through the lantern ring of the same tapering of design and sample toper section, then through the axial force that contacts compressive stress regulating part produced of screwing cause the sample to produce the displacement to the left end, sample major diameter end gradually with the contact of the little diameter end of lantern ring to contact compressive stress grow, according to experimental purpose, the adjustment is proper to contact compressive stress.
Description
Technical Field
The invention belongs to the field of fatigue strength measurement, and particularly discloses a test device and a method for measuring fretting fatigue strength of a press-fitting structure.
Background
At present, standard instruments or structures for carrying out the micro-motion fatigue test of the press-fitting structure in a unified mode are not available, and researchers usually need to design the corresponding press-fitting structure to carry out the micro-motion fatigue test according to the expected test expectation. For example, the existing axle is a typical press-fitting structure, and in order to perform fretting fatigue tests on the existing axle, an existing vertical or horizontal axle test bed is generally adopted for testing. Obviously, the test stand and the test method are different according to the test purpose and the test sample, and there is no unified test device. However, through investigation, the contact compressive stress of the press-fitting structural sample is determined when the sample is processed (generally, the sample is a press-fitting part, and the contact compressive stress is determined by the interference and the shape of the sample); the current fretting fatigue test bed cannot realize the function of changing the contact pressure stress.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fretting fatigue test device and a fretting fatigue test method with a press-fitting structure and adjustable contact pressure stress, and the device and the method can realize the control of the contact pressure stress of a test sample.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides an apparatus for measuring fretting fatigue strength of a press-fitting structure, including a supporting mechanism, a collar, a contact compressive stress adjusting member, and a clamping mechanism;
along the horizontal direction, the supporting mechanism is provided with a light hole, and the light hole is used for a sample to pass through and support the sample;
the contact pressure stress adjusting piece is used for being matched with the threaded section of the sample to adjust the contact pressure stress of the sample;
the lantern ring is used for matching with the conical section of the sample, and the conical degrees of the lantern ring and the conical section are the same;
the fastener is used for connecting the lantern ring and the supporting mechanism;
the clamping mechanism is used for clamping the clamping section of the sample.
In the invention, because the test sample at the press-fitting end and the lantern ring have the same proportion of conicity, the axial force generated by screwing the contact pressure stress regulating piece causes the test sample to displace towards the left end, and the large-diameter end of the test sample gradually contacts with the small-diameter end of the lantern ring, so that the contact pressure stress is increased, and the contact pressure stress is regulated to be proper according to the test purpose.
As a further technical proposal, an axial strain gauge is stuck on the sample; a circumferential strain gauge is adhered to the lantern ring; along with the screw in of contact compressive stress regulating part, elastic deformation can take place for the sample atress, be elongated promptly, then axial foil gage can give the feedback, simultaneously, along with the screw in of contact compressive stress regulating part, the sample can take place to expand in the direction of radius for the atress, circumference foil gage can detect its deformation in the direction of radius, data through two foil gages detection, can obtain the size of the contact compressive stress of exerting at present, then according to the size of the contact compressive stress who records, the contact compressive stress of this pressure equipment structure of real time control, and then reach the purpose that contact compressive stress adjusted.
As a further technical scheme, the clamping mechanism comprises an upper clamping piece and a lower clamping piece, an arc-shaped groove is formed in the bottom surface of the upper clamping frame, the arc-shaped groove is formed in the top surface of the lower clamping piece, and the upper clamping piece and the lower clamping piece are connected together through a connecting piece after clamping the clamping section.
As a further technical scheme, a stress conduction rod is arranged in the arc-shaped groove.
As a further technical scheme, a first pair of middle grooves in the sample pair are arranged on the upper clamping piece, and the center line of the first pair of middle grooves is superposed with the center line of the upper clamping piece.
As a further technical scheme, the upper surface and the lower surface of the clamping section are planes, a second centering groove is arranged on the end face of the clamping section, and the center line of the second centering groove passes through the center of the cross section of the sample and is perpendicular to the upper surface and the lower surface of the sample clamping section.
As a further technical scheme, a centering block for keeping centering is embedded in the first centering groove and the second centering groove.
As a further technical scheme, the upper clamping piece comprises a rectangular block and a cylindrical rod arranged at the center of the rectangular block, and the extension line of the axial line of the cylindrical rod is perpendicular to and intersects with the axial line of the sample.
As a further technical scheme, the supporting mechanism comprises an X-direction position adjusting device and a Y-direction position adjusting device.
In a second aspect, an embodiment of the present invention is based on the foregoing apparatus, and further provides a detection method, including:
a: and (3) sample installation: firstly, a sample is matched with a left end sleeve ring, a thread section of the sample penetrates through an unthreaded hole on a supporting mechanism, the sleeve ring is fixed on the supporting mechanism by using a fastener, two stress conduction rods are respectively placed into circular grooves prefabricated by an upper clamping piece and the sample, a lower clamping piece and the sample, the clamping mechanism and the sample are screwed by the fastener, the relative positions of a part disc and a test bed mounting seat are adjusted until the upper clamping piece at the right end can be placed into an upper chuck of a fatigue testing machine, and the position of the chuck of the fatigue testing machine is adjusted;
b: adjusting the contact pressure stress of the press mounting structure: because the test sample at the press-fitting end and the lantern ring have the same proportion of conicity, the axial force generated by screwing the contact pressure stress adjusting piece causes the test sample to displace towards the left end, the large-diameter end of the test sample gradually contacts with the small-diameter end of the lantern ring, so that the contact pressure stress is increased, and the contact pressure stress is adjusted to be proper according to the test purpose;
c: applying a load: applying a cyclic load to the tool through a fatigue testing machine, keeping a lower hydraulic chuck of the fatigue testing machine still, and applying a reciprocating load to an upper hydraulic chuck;
d: and (4) checking test results: according to the purpose of the test, the required test data is extracted.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
1. the invention aims to provide a device and a method for measuring the fretting fatigue strength of a press mounting structure, wherein the device can realize controllable contact pressure stress of the press mounting structure; specifically, through the lantern ring of the same tapering of design and sample toper section, then through the axial force that the contact compressive stress regulating part produced of screwing cause the sample to produce the displacement to the left end, sample major diameter end gradually with the contact of the little diameter end of lantern ring to contact compressive stress grow, according to experimental purpose, adjusts suitable contact compressive stress.
2. The method is suitable for the electro-hydraulic servo fatigue testing machine, and has applicability to samples with different lengths in a certain range by reasonably designing the clamping mechanism and the sample clamping mechanism (the upper clamping piece and the lower clamping piece);
3. after the stress conduction rod is added into the device, the contact is changed into line contact, when a testing machine applies load, the sample is slowly stressed and deformed, the deformation space is large, and the deformation can share a part of force, so that the problem of sudden change of stress of the clamping end in the process of circulating load is avoided.
4. According to the invention, the centering grooves are formed in the end part of the sample and the upper clamping piece, so that the sample can be conveniently and quickly centered with the clamping mechanism when the clamping end sample is installed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a fretting fatigue test device of a press-fitting structure, which is provided by the invention;
FIG. 2 is a schematic cross-sectional view of the press-fitting arrangement (excluding the base and mount) of FIG. 1;
FIG. 3 is a right side view of the clamping section (including the clamping mechanism and test sample) of the press-fit arrangement of FIG. 2;
in the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.
In the figure: 1-base, 2-mounting seat, 3-part disc, 4-lantern ring, 5-fastener, 6-clamping mechanism, 7-stress conduction rod, 8-centering groove, 9-upper clamping piece, 10-sample, 11-axial strain gauge, 12-circumferential strain gauge, 13-contact pressure stress adjusting nut, 14-fastener and 15-lower clamping piece.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as introduced in the background art, the invention provides a device and a method for measuring the micro fatigue strength of a press-fitting structure aiming at the existing test sample because the existing press-fitting structure micro fatigue test device cannot realize the adjustment of the contact pressure stress. The structure of the sample used in this embodiment is shown in fig. 2 and 3, and the orientation shown in fig. 2 is used as a reference standard, the sample 10 corresponding to the device provided in this embodiment is a threaded section, a tapered section, a cylindrical section and a clamping section from left to right, and different sections are transited through an arc. The left side of the conical section of the sample is a small-diameter end, the right side of the conical section of the sample is a large-diameter end, the diameter of the large-diameter end is the same as that of the cylindrical section, in the embodiment, the taper of the conical section is 1:30, and the shape of the clamping section of the sample is as follows: the cylindrical rod is formed by cutting off a part of the cylindrical rod along the cross section of the cylindrical section in an up-down symmetrical manner, namely, as shown in fig. 3, the upper surface of the clamping section is a plane, and the lower surface of the clamping section is also a plane.
In a typical embodiment of the present invention, as shown in fig. 1, fig. 1 schematically depicts an embodiment of a device for measuring the fretting fatigue strength of a press-fitting structure, which is built based on a common electro-hydraulic servo fatigue testing machine and has wide applicability; the device according to the embodiment of fig. 1 comprises a base 1, a mounting seat 2, a part disc 3, a collar 4, a fastener 5, a clamping mechanism 6, a stress conducting rod 7, an upper clamping piece 9, an axial strain gauge 11, a circumferential strain gauge 12, a contact compressive stress adjusting nut 13, a fastener 14 and a lower clamping piece 15; the base 1 is provided with an installation seat 2, a part disc 3 is fixed on the installation seat 2, the part disc 3 is provided with a unthreaded hole, the axis of the unthreaded hole is horizontally arranged, and one end of a sample 10 penetrates through the unthreaded hole and is matched with a contact compressive stress adjusting nut 13; the position of the part disc 3 is fixed through the contact pressure stress adjusting nut 13, and the contact pressure stress adjusting nut 13 can adjust the contact pressure stress; the other end of the sample 10 is clamped by an upper clamping piece 9 and a lower clamping piece 15; stress conducting rods 7 are arranged on the surfaces of the upper clamping piece and the lower clamping piece, which are in contact with the sample; a section of the sample close to the matching position of the part disc 3 has a certain taper, the section is matched with the lantern ring 4, the lantern ring 4 is connected with the part disc 3 through a fastener 5, the circumferential strain gauge 12 is pasted on the lantern ring 4, and the axial strain gauge 11 is pasted on the sample 10; the contact pressure stress adjusting nut 13 in the embodiment is a contact pressure stress adjusting part, and when the micro fatigue strength of the press mounting structure needs to be detected, the device is matched with the existing fatigue testing machine to realize the test of the micro fatigue strength of the press mounting structure; namely, the device realizes the functions of sample clamping and contact pressure stress adjustment.
The following is a detailed description of the structure and interconnection of the various components used in the present device;
as shown in fig. 1, the base 1 disclosed in this embodiment is a rectangular block structure as a whole, a plurality of sliding grooves are provided on the upper surface of the rectangular block structure, and assuming that the installation direction of the sliding grooves is the X direction, in this embodiment, three sliding grooves are provided in the X direction, the three sliding grooves are parallel to each other, the bottom of the mounting base 2 is connected to a slider, the slider can move in the sliding grooves, the purpose of providing the sliding grooves on the base is mainly to realize the position adjustment of the sample in the X direction, and when the sample is adjusted to a set position, the positions of the mounting base 2 and the base 1 are fixed by a fastening member 14. It should be noted that, in this embodiment, the sliding groove is an inverted T-shaped groove, in other embodiments, the sliding groove may also be in other shapes, and the number of the sliding grooves is not limited to three disclosed in this embodiment.
As shown in fig. 1, the mounting base 2 disclosed in this embodiment is also a rectangular block structure, a plurality of sliding grooves are provided on an upper surface of the rectangular block structure, the direction of the sliding grooves is the Y direction, in this embodiment, three sliding grooves are provided in the Y direction, the three sliding grooves are parallel to each other, the bottom of the part disc 3 is connected to a slider, the slider can move in the sliding grooves, the purpose of providing the sliding grooves on the mounting base 2 is mainly to adjust the position of the sample in the Y direction, and when the sample is adjusted to a set position, the positions of the part disc 3 and the mounting base 2 are fixed by the fastening member 14. In this embodiment, the position of the sample in the horizontal plane is adjusted by providing the sliding grooves in the base 1 and the mounting seat 2. It should be noted that, in this embodiment, the sliding groove is an inverted T-shaped groove, in other embodiments, the sliding groove may also be in other shapes, and the number of the sliding grooves is not limited to three disclosed in this embodiment.
The part disc 3 disclosed in the embodiment comprises a horizontal bottom plate and a vertical plate which are perpendicular to each other and are integrally formed, the bottom of the horizontal bottom plate is fixed on a sliding block, and the sliding block slides back along a sliding groove in the upper surface of the mounting seat 2; the vertical part is provided with a unthreaded hole, the axis direction of the unthreaded hole is the X direction, and the periphery of the unthreaded hole is also provided with a circle of threaded holes; and a triangular reinforcing rib plate is fixed between the horizontal bottom plate and the vertical plate of the part disc 3 and used for reinforcing the horizontal bottom plate and the vertical plate.
As shown in fig. 2, the collar 4 disclosed in this embodiment is a ring-shaped structure, and the central hole of the collar 4 is a tapered hole, and the taper of the central hole is the same as that of the tapered section of the test piece 10; the taper of the tapered section of the sample 10 in this example is 1:30, so the taper of the collar 4 is also 1: 30; the lantern ring 4 is mainly used for being sleeved on the conical section of the sample in a matching mode, and the lantern ring 4 is fixed on a vertical plate of the part disc 3 through a plurality of bolts (namely the bolts are matched with threaded holes in the part disc 3); and further, in the present embodiment, with reference to the orientation shown in fig. 2, the right portion of the collar 4 has an outer protrusion with a reduced diameter and integrally formed therewith, and the circumferential strain gauge 12 is disposed on the outer protrusion for detecting the deformation of the collar 4.
As shown in fig. 2 and 3, the holding mechanism 6 of the test specimen 10 disclosed in the present embodiment is composed of an upper holding member 9 and a lower holding member 15; the upper clamping piece 9 is composed of a cylindrical rod used for clamping an upper clamping head of the fatigue testing machine and a rectangular plate fixed together with the cylindrical rod; the lower clamping piece 15 is a rectangular plate; rectangular plates of the upper clamping piece and the lower clamping piece are fixed on an upper plane and a lower plane of the sample clamping section through at least two bolts; meanwhile, the bottom surface of the upper clamping piece 9 is provided with an arc-shaped groove, the top surface of the lower clamping piece 15 is also provided with an arc-shaped groove, and the two stress conduction rods 7 are respectively arranged in the arc-shaped groove on the bottom surface of the rectangular plate of the upper clamping piece and the arc-shaped groove on the top surface of the lower clamping piece.
Further preferably, in this embodiment, a centering groove 8 is formed on the right end face (with reference to the orientation shown in fig. 2) of the clamping section of the sample 10, and the center line of the centering groove 8 passes through the center of the cross section of the sample and is perpendicular to the upper and lower planes for clamping the sample 10; therefore, in order to realize the centering between the clamping mechanism and the sample in the embodiment, another pair of middle grooves is also formed on the right end surface (the orientation shown in fig. 2 is taken as a reference) of the rectangular plate of the upper clamping piece 9, and the center lines of the other pair of middle grooves are coincident with the center line of the rectangular plate; after the sample 10 is clamped between the upper clamping member and the lower clamping member, a centering block for keeping centering is embedded in a centering groove on the sample 10 and another centering groove on the upper clamping member 9, and an extension line of an axial lead of a cylindrical rod of the upper clamping member 9 is vertical and intersects with the axial lead of the sample. After the stress conducting rod 7 is added, the contact is changed into line contact, when a testing machine applies load, the sample is slowly stressed and deformed, the deformation space is large, and the deformation can share part of force, so that the problem of sudden change of stress of the clamping end in the process of circulating load is avoided.
Further, as shown in fig. 2, an axial strain gauge 11 is provided on the cylindrical section of the test specimen 10 for detecting strain of the test specimen 10 in the axial direction thereof; a circumferential strain gage 12 is provided on the collar 4, the circumferential strain gage 12 being used to detect strain of the test specimen 10 in a radial direction thereof; it should be noted that a plurality of axial strain gauges 11 and circumferential strain gauges 12 may be provided in this embodiment, and a plurality of data may be detected in time. The specific principle of detection is as follows: along with the screw in of contact compressive stress adjusting nut 13, the sample atress can take place elastic deformation, be elongated promptly, then axial foil gage 11 can give the feedback, simultaneously, along with the screw in of contact compressive stress adjusting nut 13, sample 10 can take place the expansion by the atress, be propped big in the radius direction promptly, then circumference foil gage 12 can detect its deformation in the radius direction, data through two foil gages detection, can obtain the size of the contact compressive stress of exerting at present, then according to the size of the contact compressive stress who records, the contact compressive stress of this pressure equipment structure of real-time control, and then reach the purpose that contact compressive stress adjusted.
Further, based on the above-mentioned device for measuring the micro-motion fatigue strength of the press-fitting structure, the embodiment further provides a method for measuring the micro-motion fatigue strength of the press-fitting structure, and the method partially needs to be matched with the existing fatigue testing machine to detect the micro-motion fatigue strength of the press-fitting structure, which specifically comprises the following steps:
a: and (3) sample installation: firstly, a sample is matched with a left end sleeve ring, the sample is fixed on a part disc by using a fastener, two stress conduction rods are respectively placed in circular grooves prefabricated by an upper clamping piece and the sample, and a lower clamping piece and the sample, a clamping mechanism and the sample are screwed by the fastener, the relative positions of the part disc and a test bed mounting seat are adjusted until the upper clamping piece at the right end can be placed in a hydraulic chuck on a fatigue testing machine, and the position of the chuck of the fatigue testing machine is adjusted;
b: adjusting the contact pressure stress of the press mounting structure: because the test sample at the press-fitting end and the lantern ring have the same proportion of conicity, the axial force generated by screwing the contact pressure stress adjusting nut 13 causes the test sample to displace towards the left end, the large-diameter end of the test sample gradually contacts with the small-diameter end of the lantern ring, so that the contact pressure stress is increased, and the proper contact pressure stress is adjusted according to the test purpose;
c: applying a load: applying a cyclic load to the tool through a fatigue testing machine, keeping a lower hydraulic chuck of the fatigue testing machine still, and applying a reciprocating load to an upper hydraulic chuck;
d: and (4) checking test results: according to the purpose of the test, the required test data is extracted.
According to the device and the method provided by the embodiment, the contact pressure stress can be changed in real time, different from the traditional matched samples, the contact pressure stress of a pair of samples cannot be changed after the press mounting, if the contact pressure stress after the press mounting is not required by the test, the samples need to be recalculated and processed, and the press mounting is carried out again, so that not only is the time wasted, but also the manpower and material resources are wasted.
Finally, it is also noted that relational terms such as first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A device for measuring the fretting fatigue strength of a press-fitting structure is characterized by comprising a supporting mechanism, a lantern ring, a contact pressure stress adjusting piece and a clamping mechanism;
along the horizontal direction, the supporting mechanism is provided with a light hole, and the light hole is used for a sample to pass through and support the sample;
the contact pressure stress adjusting piece is used for being matched with the threaded section of the sample to adjust the contact pressure stress of the sample;
the lantern ring is used for matching with the conical section of the sample, and the conical degrees of the lantern ring and the conical section are the same;
the fastener is used for connecting the lantern ring and the supporting mechanism;
the clamping mechanism is used for clamping the clamping section of the sample.
2. The apparatus for measuring fretting fatigue strength of a press-fit structure according to claim 1, further comprising an axial strain gage, said axial strain gage being disposed on the test specimen.
3. The apparatus for measuring fretting fatigue strength of a press-fit structure according to claim 1, further comprising a circumferential strain gage; the circumferential strain gauge is arranged on the lantern ring.
4. The apparatus according to claim 1, wherein the clamping mechanism comprises an upper clamping member and a lower clamping member, the bottom surface of the upper clamping member is provided with an arc-shaped groove, the top surface of the lower clamping member is provided with an arc-shaped groove, and the upper clamping member and the lower clamping member are connected together through a connecting member after clamping the clamping section of the test sample.
5. The apparatus for measuring fretting fatigue strength of a press-fit structure according to claim 4, wherein said arcuate slot houses a stress conducting bar.
6. An apparatus for measuring fretting fatigue strength of a press-fit structure as claimed in claim 4, wherein a first pair of middle grooves aligned with the test piece is provided on said upper clamping member, and a center line of the first pair of middle grooves coincides with a center line of the upper clamping member.
7. The apparatus for measuring fretting fatigue strength of a press-fit structure according to claim 6, wherein the first centering groove is embedded with a centering block for keeping the specimen centered with the upper holding member.
8. The apparatus for measuring fretting fatigue strength of a press-fitting structure according to claim 4, wherein said upper holding member comprises a rectangular block and a cylindrical rod disposed at the center of the rectangular block, and an extension line of an axis line of the cylindrical rod is perpendicular to and intersects with an axis line of the test piece.
9. A device for measuring fretting fatigue strength of a press-fitting structure as in claim 1, wherein said support mechanism is placed on a base, said base comprising X-direction and Y-direction position adjustment means.
10. A method for testing fretting fatigue strength of press-fitting structures using the device of claims 1-9, characterized in that:
mating the sample with the collar; the threaded section of the sample penetrates through the unthreaded hole in the supporting mechanism, and then the lantern ring is connected with the supporting mechanism through the fastener;
respectively placing two stress conduction rods into circular grooves prefabricated by an upper clamping piece and a sample, and a lower clamping piece and the sample, screwing a clamping mechanism and the sample through fasteners, adjusting the relative positions of a supporting mechanism and a test bed mounting seat so that the upper clamping piece can be placed into an upper chuck of a fatigue testing machine, and adjusting the position of the chuck of the fatigue testing machine;
installing a contact compressive stress adjusting piece on the threaded section of the sample, and adjusting the contact compressive stress adjusting piece to enable the contact compressive stress of the contact compressive stress adjusting piece and the sample to be adjusted to a set value;
applying a cyclic load to the tool through a fatigue testing machine, keeping a lower hydraulic chuck of the fatigue testing machine still, and applying a reciprocating load to an upper hydraulic chuck;
and (4) checking test results: according to the purpose of the test, the required test data is extracted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110621003.7A CN113514354A (en) | 2021-06-03 | 2021-06-03 | Device and method for measuring fretting fatigue strength of press-fitting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110621003.7A CN113514354A (en) | 2021-06-03 | 2021-06-03 | Device and method for measuring fretting fatigue strength of press-fitting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113514354A true CN113514354A (en) | 2021-10-19 |
Family
ID=78065259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110621003.7A Pending CN113514354A (en) | 2021-06-03 | 2021-06-03 | Device and method for measuring fretting fatigue strength of press-fitting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113514354A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598647A (en) * | 2009-07-14 | 2009-12-09 | 中国矿业大学 | A kind of steel wire fretting fatigue testing machine and method |
| CN202562808U (en) * | 2012-05-07 | 2012-11-28 | 长春新试验机有限责任公司 | Sample prestress clamping device |
| CN203350112U (en) * | 2013-08-12 | 2013-12-18 | 北京航空航天大学 | Special clamping load application device for fretting fatigue test |
| CN104181031A (en) * | 2014-09-09 | 2014-12-03 | 西南交通大学 | Point contact type fretting fatigue test device and point contact type fretting fatigue test method |
| CN104931366A (en) * | 2015-06-08 | 2015-09-23 | 天津大学 | Fretting fatigue testing method allowing contact load to be adjusted in real time and testing machine adopting fretting fatigue testing method |
| CN105675412A (en) * | 2016-01-14 | 2016-06-15 | 西南交通大学 | Bending fretting fatigue experimental equipment and experimental method |
| CN105699214A (en) * | 2016-01-14 | 2016-06-22 | 西南交通大学 | Torsional fretting fatigue testing equipment and experiment |
| CN106950107A (en) * | 2017-03-30 | 2017-07-14 | 南京航空航天大学 | A kind of three-point bending fatigue experimental device |
| CN109612855A (en) * | 2018-12-12 | 2019-04-12 | 同济大学 | A kind of fretting fatigue testing device for High Temperature Rotating fatigue bending machine |
-
2021
- 2021-06-03 CN CN202110621003.7A patent/CN113514354A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598647A (en) * | 2009-07-14 | 2009-12-09 | 中国矿业大学 | A kind of steel wire fretting fatigue testing machine and method |
| CN202562808U (en) * | 2012-05-07 | 2012-11-28 | 长春新试验机有限责任公司 | Sample prestress clamping device |
| CN203350112U (en) * | 2013-08-12 | 2013-12-18 | 北京航空航天大学 | Special clamping load application device for fretting fatigue test |
| CN104181031A (en) * | 2014-09-09 | 2014-12-03 | 西南交通大学 | Point contact type fretting fatigue test device and point contact type fretting fatigue test method |
| CN104931366A (en) * | 2015-06-08 | 2015-09-23 | 天津大学 | Fretting fatigue testing method allowing contact load to be adjusted in real time and testing machine adopting fretting fatigue testing method |
| CN105675412A (en) * | 2016-01-14 | 2016-06-15 | 西南交通大学 | Bending fretting fatigue experimental equipment and experimental method |
| CN105699214A (en) * | 2016-01-14 | 2016-06-22 | 西南交通大学 | Torsional fretting fatigue testing equipment and experiment |
| CN106950107A (en) * | 2017-03-30 | 2017-07-14 | 南京航空航天大学 | A kind of three-point bending fatigue experimental device |
| CN109612855A (en) * | 2018-12-12 | 2019-04-12 | 同济大学 | A kind of fretting fatigue testing device for High Temperature Rotating fatigue bending machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103616295B (en) | A kind of non-standard rock sample bar mechanics parameter testing device and method of testing | |
| CN105628496A (en) | Multifunctional shearing test fixture used for composite material parameter identification | |
| CN109507037B (en) | Small punch creep test device and method capable of realizing accurate continuous loading | |
| CN106644772B (en) | Metal material elongation detecting and positioning device | |
| US5377549A (en) | Alignment device and method of aligning | |
| CN102087186A (en) | Fretting fatigue test platform | |
| CN109556944B (en) | High-flux mechanical test device | |
| CN104596695B (en) | Loading device for accurately controlling rivet preload of riveting member | |
| CN113514354A (en) | Device and method for measuring fretting fatigue strength of press-fitting structure | |
| CN206095662U (en) | Furniture structure joint endurance bending strength testing arrangement | |
| CN211317987U (en) | Clamp for testing small sample small plunger | |
| CN111496710A (en) | Fixture for elastic ring rigidity test | |
| CN110864651B (en) | Differential mechanism shell quality detection equipment | |
| CN209673356U (en) | A kind of automobile controller test fixture | |
| CN212228559U (en) | Positioning device of axial deformation extensometer | |
| CN212123006U (en) | Fixture for elastic ring rigidity test | |
| CN105241358A (en) | Experiment clamp with an angle adjusting function and a height adjusting function | |
| CN106018077A (en) | Test fixture for multi-axial fatigue crack propagation performance of CT samples | |
| CN111289357B (en) | Clamp device for vacuum high-temperature indentation creep test | |
| CN212123055U (en) | Magnetic circuit system assembling tool | |
| CN211179250U (en) | Device for adjusting perpendicularity of actuating rod of portable micrometer press-in instrument | |
| CN112985344A (en) | Internal thread coaxiality detection device | |
| CN205910057U (en) | Tired capability test anchor clamps of pole sample multiaxis | |
| CN112798405B (en) | Clamp for testing small punch rod of small sample | |
| CN111442971B (en) | Positioning device and positioning method for axial deformation extensometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |