CN114252362B - Double-shaft loading fretting wear testing machine - Google Patents
Double-shaft loading fretting wear testing machine Download PDFInfo
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- CN114252362B CN114252362B CN202111461040.2A CN202111461040A CN114252362B CN 114252362 B CN114252362 B CN 114252362B CN 202111461040 A CN202111461040 A CN 202111461040A CN 114252362 B CN114252362 B CN 114252362B
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- 238000012360 testing method Methods 0.000 title claims abstract description 106
- 238000006073 displacement reaction Methods 0.000 claims abstract description 80
- 230000005284 excitation Effects 0.000 claims abstract description 30
- 238000005299 abrasion Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 abstract description 7
- 238000011160 research Methods 0.000 abstract description 7
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000013142 basic testing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- G01N3/56—Investigating resistance to wear or abrasion
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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
- G01N3/02—Details
-
- 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
Abstract
The invention discloses a double-shaft loading fretting wear testing machine which comprises a test piece clamp for fixing a test piece, a normal contact load loading assembly for applying a normal load to the test piece and a transverse displacement loading assembly for applying a transverse load to the test piece and detecting displacement. The invention designs the double-shaft loading device, can realize the fretting wear test under the action of alternating normal contact load, so that the experimental research of the fretting wear is closer to the actual working condition of engineering problems, the research range of the fretting wear is expanded, the fretting running state in the fretting wear test process can be better regulated and controlled, an ideal test means is provided for researching the fretting wear mechanism under different fretting running states, the micrometer-level displacement loading is realized by designing the displacement excitation plate spring structure, the simpler structure is applied, the higher loading precision is realized, the requirement on the precision of loading equipment is reduced, and the cost of the tester is reduced. The displacement of the micro-motion pad and the test piece is measured respectively to obtain real relative displacement data, so that the accuracy of micro-motion abrasion research is improved.
Description
Technical Field
The invention relates to the field of fretting wear tests, in particular to a double-shaft loading fretting wear testing machine.
Background
When two elastic bodies in contact with each other are in a vibration working condition, the contact surface is kept in a nearly fastened state from the macroscopic level under the action of normal (normal direction of the contact surface), but relative sliding is generated locally in the contact area under the action of tangential (parallel direction of the contact surface) load and non-cooperative deformation of the two elastic bodies at the microscopic level, and the relative sliding is generally in the micrometer scale and is called "inching". Micro-movements can cause frictional wear of the contact surfaces, causing seizure, loosening, increased noise, etc. of the components. The micro-motion can also act together with the far-end load to cause the formation and expansion of fatigue cracks, so that the fatigue life of the component is greatly reduced. Eventually leading to failure of the mechanical system. Fretting wear refers to a compound wear between friction pair surfaces due to small amplitude relative displacement. Micro-motion phenomena can easily occur in the states of bolt connection, riveting, pin connection, spline connection and the like under the vibration state. In fretting wear, only a localized contact load exists between the contact pairs, and the relative motion between the contact pairs is caused by external vibrations.
In the existing fretting wear field, a fretting pad is contacted with a flat test piece under the action of a constant normal load, and the fretting pad is fixed by a fretting pad clamp (which can be equivalent to a spring). And applying displacement (generally in the micron order) with a certain amplitude and period to the test piece, and generating fretting wear at the contact position of the test piece and the fretting pad. Basic test principle of fretting wear test the present technical proposal is based on the model, and is mostly focused on improving the simulation aspect of the environment. For example, there are some fretting wear test devices for specific structures such as wire ropes and heat transfer tubes of heat exchangers, which simulate fretting wear in high temperature and high pressure, water environments, corrosive environments, etc. In the above devices, however, the normal load is typically a constant load, or not independently controllable. In many fretting engineering cases, however, the normal load to which the structure is subjected is variable in real time. In addition, fretting wear is also controlled by the jog operation mechanism. Different jog operation mechanisms are affected by normal load, displacement amplitude, and jog pad clamp stiffness. The conventional fretting wear test device does not show a case of adjusting the rigidity of the fretting pad, so that the controllability of the fretting state is poor.
Disclosure of Invention
The invention aims to solve the problems and provide a double-shaft loading fretting wear testing machine.
The invention realizes the above purpose through the following technical scheme:
the double-shaft loading fretting wear testing machine comprises a test piece clamp for fixing a test piece, a normal contact load loading assembly for applying a normal load to the test piece and a transverse displacement loading assembly for applying a transverse load and detecting displacement to the test piece, wherein the normal contact load loading assembly and the transverse displacement loading assembly are arranged at the upper end of a base of the testing machine, the lower end of the normal contact load loading assembly is matched with the test piece clamp, the lateral end face of the test piece clamp is connected with the transverse displacement loading assembly, the normal contact load loading assembly and the transverse displacement loading assembly are connected with an external controller through cables, and the controller is communicated with an industrial computer through the cables;
the normal contact load loading assembly comprises a normal loading actuator, a normal loading bearing frame, a normal loading force sensor, a normal loading ejector rod, a normal loading roller and a micro-motion pad supporting base, wherein the micro-motion pad supporting base is provided with the micro-motion pad supporting roller, the upper side of the micro-motion pad supporting roller is provided with a micro-motion pad clamp, two sides of the micro-motion pad clamp are provided with micro-motion pad rigidity adjusting leaf springs, the micro-motion pad rigidity adjusting leaf springs are supported by the leaf spring support, the leaf spring support is arranged on the tester base, the micro-motion pad clamp is provided with the micro-motion pad, the lower end of the test piece clamp is provided with the test piece, the upper end of the test piece clamp is matched with the normal loading ejector rod, the upper end of the normal loading ejector rod is connected with the movable end of the normal loading actuator, the normal loading force sensor is arranged between the normal loading ejector rod and the normal loading actuator, the normal loading fixed end is connected with the normal loading bearing frame, and the normal loading bearing frame is arranged on the tester base;
the transverse displacement loading assembly comprises a transverse loading push rod support, a transverse actuator support, a transverse loading actuator, a transverse loading force sensor, a displacement excitation leaf spring, a friction force measuring sensor, a displacement measuring sensor assembly and a test piece clamp, wherein one end of the test piece clamp is provided with the displacement measuring sensor assembly, the other end of the test piece clamp is connected with the friction force measuring sensor through a push rod, one end of the friction force measuring sensor is connected with the displacement excitation leaf spring through a push rod, the displacement excitation leaf spring is connected with the transverse loading push rod support through a bolt, the friction force measuring sensor and the outside of the displacement excitation leaf spring are provided with the transverse loading push rod support, the power end of the displacement excitation leaf spring is connected with a movable part of the transverse loading actuator, the transverse loading force sensor is arranged between the displacement excitation leaf spring and the transverse loading actuator, and a fixing part of the transverse loading actuator is fixed on a base of the tester through the transverse actuator support.
Preferably: and the roller between the normal loading ejector rod and the test piece clamp is connected with the normal loading ejector rod.
By means of the arrangement, the two are contacted through the rollers to form a movable line contact mode, so that the influence of the application of normal contact load force on the application of lateral displacement is avoided.
Preferably: the micro-motion pad support base is connected with the micro-motion pad rigidity adjusting plate spring through a bolt, and the micro-motion pad rigidity adjusting plate spring is fixed on the tester base through a plate spring bracket.
The device is arranged in such a way, the effective working length of the micro-motion pad adjusting plate spring is changed by changing the mounting position of the plate spring support, so that the rigidity of the micro-motion pad clamp is adjusted.
Preferably: the test piece fixture is connected with the displacement excitation plate spring through a push rod, the displacement excitation plate spring is installed on a transverse loading push rod support through a bolt, and the displacement excitation plate spring is connected with the transverse loading actuator through a push rod.
The device is arranged in such a way, so that the thrust of the transverse loading actuator is converted into the deformation of the displacement excitation plate spring, and the deformation of the displacement excitation plate spring is utilized to realize the displacement loading with micron-scale precision.
Preferably: the bottom of the micro-motion pad clamp is connected with the micro-motion pad support base through the micro-motion pad support roller, and the micro-motion pad support base is arranged on the tester base.
The arrangement ensures that the motion of the micro-motion pad clamp in the displacement loading direction is not influenced by the normal loading assembly.
Preferably: the normal loading bearing frame is connected with the transverse actuator support and the transverse loading push rod support through bolts, the normal loading force sensor is connected with the normal loading actuator and the normal loading push rod through bolts, and the transverse loading force sensor is connected with the displacement excitation leaf spring and the transverse loading actuator through bolts.
So set up, guarantee through the connection and connect rigidity, improve the measurement accuracy.
Compared with the prior art, the invention has the following beneficial effects:
1. aiming at the problem that the dynamic normal contact load loading cannot be realized in the prior art, the bidirectional loading of alternating normal contact load and transverse displacement is realized by designing a normal load loading device. By changing the loading parameters of the two channels, the fretting wear test under the proportional/non-proportional loading working condition is realized. The experimental research of fretting wear is closer to the actual working condition of engineering problems, the research range of fretting wear is expanded, and a more comprehensive experimental means is provided for the research of the fretting wear mechanism.
2. The device is designed for adjusting the rigidity of the micro-motion pad clamp, so that the rigidity adjustment in a large range can be realized, and the controllability of test parameters is improved. The method can better regulate and control the inching operation state in the inching abrasion test process, and provides an ideal test means for researching the inching abrasion mechanism under different inching operation states.
3. The method aims at solving the problems that in the prior art, high-precision and small-displacement control is difficult to realize and the requirement on the displacement and loading precision of the loading actuator is high. By designing the structure of the displacement excitation plate spring, the micron-sized displacement loading is realized. The simple structure is applied, so that higher loading precision is realized, the requirement on the precision of loading equipment is reduced, and the cost of the testing machine is reduced.
4. The displacement measuring device is designed for solving the problem that the real relative slippage between the micro-motion pad and the test piece cannot be directly measured in the prior art, and the real relative displacement data are obtained by measuring the displacement data of the micro-motion pad and the test piece respectively, so that the accuracy of micro-motion abrasion research is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a dual-axis loading fretting wear testing machine according to the present invention;
FIG. 2 is a front view of a dual-axis loading fretting wear testing machine according to the present invention;
FIG. 3 is a schematic diagram of the micro-motion pad and test piece clamp of the dual-axis loading micro-motion wear testing machine according to the present invention.
The reference numerals are explained as follows:
1. a normal contact load loading assembly; 2. a lateral displacement loading assembly; 3. a base of the testing machine; 4. an industrial computer; 5. a controller; 6. normal loading of the actuator; 7. normal loading of the load-bearing frame; 8. a normal loading force sensor; 9. normal loading ejector rods; 10. a displacement measurement sensor assembly; 11. the micro-motion pad supports the base; 12. transversely loading a push rod bracket; 13. a transverse actuator support; 14. a transverse loading actuator; 15. a lateral loading force sensor; 16. a displacement excitation plate spring; 17. a friction force measuring sensor; 18. a test piece clamp; 19. a normal loading roller; 20. a test piece; 21. a micro-motion pad; 22. micro-motion pad rigidity adjusting plate spring; 23. the micro-motion pad supports the roller; 24. a micro-motion pad clamp; 25 leaf spring support.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention is further described below with reference to the accompanying drawings:
example 1
As shown in fig. 1-3, the dual-shaft loading fretting wear testing machine comprises a test piece clamp 18 for fixing a test piece, a fretting pad clamp 24 for fixing a fretting pad, a normal contact load loading assembly 1 for applying a normal load to the test piece and a transverse displacement loading assembly 2 for applying a transverse load and detecting displacement to the test piece, wherein the normal contact load loading assembly 1 and the transverse displacement loading assembly 2 are arranged at the upper end of a base 3 of the testing machine, the lower end of the normal contact load loading assembly 1 is matched with the test piece clamp 18 and the fretting pad clamp 24, the lateral end surface of the test piece clamp 18 is provided with the transverse displacement loading assembly 2, the normal contact load loading assembly 1 and the transverse displacement loading assembly 2 are connected with an external controller 5 through cables, and the controller 5 is communicated with an industrial computer 4 through the cables;
the normal contact load loading assembly 1 comprises a normal load actuator 6, a normal load bearing frame 7, a normal load force sensor 8, a normal load ejector rod 9, a normal load roller 19 and a micro-motion pad support base 11, wherein the micro-motion pad support roller 23 is arranged on the micro-motion pad support base 11, the upper end of a test piece clamp 18 is matched with the normal load ejector rod 9, the normal load ejector rod 9 is contacted with the test piece clamp 18 through the normal load roller 19, the upper end of the normal load ejector rod 9 is connected with a movable end of the normal load actuator 6, the normal load force sensor 8 is arranged between the normal load ejector rod 9 and the normal load actuator 6, the fixed end of the normal load actuator 6 is connected with the normal load bearing frame 7, and the normal load bearing frame 7 is arranged on a tester base;
the transverse displacement loading assembly 2 comprises a transverse loading push rod support 12, a transverse actuator support 13, a transverse loading actuator 14, a transverse loading force sensor 15, a displacement excitation plate spring 16, a friction force measuring sensor 17, a displacement measuring sensor assembly 10 and a test piece clamp 18, wherein one end of the test piece clamp 18 is connected with the displacement measuring sensor assembly 10, the other end of the test piece clamp 18 is connected with the displacement excitation plate spring 16, the friction force measuring sensor 17 is arranged between the test piece clamp 18 and the displacement excitation plate spring 16, the displacement excitation plate spring 16 is arranged on the transverse loading push rod support 12, the transverse loading push rod support 12 is fixed on the tester base 3, the power end of the displacement excitation plate spring 16 is connected with a movable part of the transverse loading actuator 14, the transverse loading force sensor 15 is arranged between the displacement excitation plate spring 16 and the transverse loading actuator 14, and the fixed part of the transverse loading actuator 14 is fixed on the tester base 3 through the transverse actuator support 13.
Preferably: the normal loading roller 19 between the normal loading ejector rod 9 and the test piece clamp 18 is connected with the normal loading ejector rod 9, and a movable line contact form is formed between the normal loading ejector rod 9 and the test piece clamp, so that the influence of the application of normal contact load force on the application of transverse displacement is avoided; the micro-motion pad clamp 24 is connected with the micro-motion pad rigidity adjusting plate spring 22 through a bolt, the micro-motion pad rigidity adjusting plate 22 is connected with the plate spring bracket 25 through a bolt, and the effective working length of the micro-motion pad rigidity adjusting plate spring 22 is changed by changing the installation position of the plate spring bracket 25, so that the rigidity of the micro-motion pad clamp 24 is adjusted; the micro-motion pad support base 11 is provided with the micro-motion pad support roller 23, so that the motion of the micro-motion pad clamp 24 in the transverse displacement loading direction is completely regulated by the displacement excitation plate spring 16; the method comprises the steps of carrying out a first treatment on the surface of the The normal loading bearing frame 7, the transverse actuator support 13 and the transverse loading push rod support 12 are connected with the tester base 3 through bolts, the normal loading force sensor 8 is connected with the normal loading actuator 6 and the normal loading push rod 9 through bolts, the transverse loading force sensor 15 is connected with the displacement excitation plate spring 16 and the transverse loading actuator 14 through bolts, the connection rigidity is guaranteed through fastening connection, and the measurement accuracy is improved.
Working principle: the test piece 20 is fixed on the test piece clamp 18, the micro-motion pad 21 is fixed on the micro-motion pad clamp, the position of the plate spring bracket 25 is regulated according to the requirement, the normal loading actuator 6 is utilized to drive the normal loading ejector rod 9, the normal loading roller 19 applies a normal load to the test piece on the test piece clamp 18, the initial position of the two displacement sensors on the displacement measurement sensor assembly is regulated, normal contact load and transverse displacement loading control parameters are input through special control software on the industrial computer 4, the test parameters of the industrial computer are communicated with the controller 5 in real time through a cable, the controller 5 controls the actuator through the cable so as to operate the test machine, the transverse loading actuator 14 is started and then applies a certain alternating load to the displacement excitation plate spring 16 so as to deform the displacement excitation plate spring, the test piece clamp 18 is driven to generate transverse reciprocating displacement, the normal loading actuator 6 synchronously applies alternating normal contact load, micro-motion is generated between the micro-motion pad 21 and the test piece 20, in the test process, the test system realizes closed loop control of the transverse loading through the transverse loading sensor 15, realizes control of the normal loading through the normal loading sensor 8, in the test process, the test piece clamp is stopped through the normal loading sensor 8, and the real-time data acquisition of the test piece clamp is stopped through the normal loading sensor assembly, and the real-time data acquisition of the test piece assembly is realized when the test piece is stopped, and the test piece is tested, and the real-time data acquisition of the test piece is tested.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (6)
1. The utility model provides a biax loading fretting wear testing machine which characterized in that: the test piece testing device comprises a test piece clamp (18) for fixing a test piece, a normal contact load loading assembly (1) for applying a normal load to the test piece and a transverse displacement loading assembly (2) for applying a transverse load and detecting displacement to the test piece, wherein the normal contact load loading assembly (1) and the transverse displacement loading assembly (2) are arranged at the upper end of a base (3) of the test machine, the lower end of the normal contact load loading assembly (1) is matched with the test piece clamp (18), the lateral end face of the test piece clamp (18) is connected with the transverse displacement loading assembly (2), the normal contact load loading assembly (1) and the transverse displacement loading assembly (2) are connected with an external controller (5) through cables, and the controller (5) is connected with an industrial computer (4) through a data bus;
the normal contact load loading assembly (1) comprises a normal loading actuator (6), a normal loading bearing frame (7), a normal loading force sensor (8), a normal loading ejector rod (9) and a micro-motion pad supporting base (11), wherein micro-motion pad supporting rollers (23) are arranged on the micro-motion pad supporting base (11), the micro-motion pad supporting rollers (23) are in contact with micro-motion pad clamps (24), the upper ends of test piece clamps (18) are matched with the normal loading ejector rod (9), the contact surfaces on the normal loading ejector rod (9) and the test piece clamps (18) are tightly pressed through rollers, the upper ends of the normal loading ejector rods (9) are connected with the normal loading force sensor (8), the movable ends of the normal loading actuator (6) are connected with the normal loading force sensor (8), the fixed ends of the normal loading actuator (6) are connected with the normal loading bearing frame (7), and the normal loading bearing frame (7) is arranged on the tester base (3);
the transverse displacement loading assembly (2) comprises a transverse loading push rod support (12), a transverse actuator support (13), a transverse loading actuator (14), a transverse loading force sensor (15), a displacement excitation plate spring (16), a friction force measuring sensor (17) and a displacement measuring sensor assembly (10), wherein the displacement measuring sensor assembly (10) is arranged at one end of a micro-motion pad support base (11), the friction force measuring sensor (17) is mounted on the transverse loading push rod support (12) through a push rod and a linear bearing, a friction force measuring sensor (17) is arranged between a test piece clamp (18) and the displacement excitation plate spring (16), the power end of the displacement excitation plate spring (16) is connected with the movable end of the transverse loading actuator (14), the transverse loading force sensor (15) is arranged between the displacement excitation plate spring (16) and the transverse loading actuator (14), and the transverse loading actuator (14) is fixed on the tester base (3) through the transverse actuator support (13).
2. The dual-axis loading fretting wear testing machine of claim 1, wherein: the normal loading ejector rod (9) is contacted with the test piece clamp (18) through a normal loading roller (19).
3. The dual-axis loading fretting wear testing machine of claim 1, wherein: the test piece (20) is installed on the bottom surface of the test piece clamp (18) through a bolt, the micro-motion pad (21) is installed on the micro-motion pad clamp (24) through a bolt, the bottom surface of the test piece (20) is contacted with the top surface of the micro-motion pad (21), so that micro-motion abrasion is generated in the test, the micro-motion pad clamp (24) is placed on the micro-motion pad support roller (23), and the micro-motion pad support roller and the micro-motion pad support base (11) are installed together through a bearing.
4. The dual-axis loading fretting wear testing machine of claim 1, wherein: the bottom of the micro-motion pad supporting base (11) is fixed on the tester base (3) through bolts.
5. The dual-axis loading fretting wear testing machine of claim 1, wherein: the micro-motion pad clamp (24) is connected with the micro-motion pad rigidity adjusting plate spring (22) through a bolt, the micro-motion pad rigidity adjusting plate spring (22) is connected with the plate spring support (25) through a bolt, and the plate spring support (25) is connected with the tester base (3) through a bolt; the rigidity of the micro-motion pad rigidity adjusting plate spring (22) is adjusted by adjusting the mounting position of the plate spring support (25).
6. The dual-axis loading fretting wear testing machine of claim 1, wherein: the normal loading bearing frame (7) and the transverse actuator support (13) are connected with the tester base (3) through bolts, the normal loading force sensor (8) is connected with the normal loading actuator (6) and the normal loading ejector rod (9) through bolts, and the transverse loading force sensor (15) is connected with the displacement excitation plate spring (16) and the transverse loading actuator (14) through bolts.
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| CN202111461040.2A CN114252362B (en) | 2021-12-02 | 2021-12-02 | Double-shaft loading fretting wear testing machine |
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| CN202111461040.2A CN114252362B (en) | 2021-12-02 | 2021-12-02 | Double-shaft loading fretting wear testing machine |
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| CN114252362B true CN114252362B (en) | 2024-03-19 |
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| CN112557224B (en) * | 2021-02-25 | 2021-06-25 | 中国科学院地质与地球物理研究所 | Alternating stress fatigue test equipment |
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