Polymer matrix composite material shear fatigue test tool

Abstract

The embodiment of the utility model provides a shear fatigue test tool for a polymer-based composite material, and relates to the technical field of performance test of composite material fan blade materials. The problem that a composite material fan blade material characteristic detection tool clamp can only provide one-way compression loading is solved. The device comprises an upper equipment connecting structure, a lower equipment connecting structure, a rigid connecting rod, a panel, a base plate, a sample upper chuck and a sample lower chuck, wherein the top end of the rigid connecting rod is detachably fixed with the upper equipment connecting structure; the panel is fixed with the bottom end of the rigid connecting rod, the base plate is fixed with the lower equipment connecting structure, the sample upper chuck is fixed with the panel, the sample lower chuck is fixed with the base plate, and the height distance between the panel and the base plate is adjustable, so that the sample upper chuck and the sample lower chuck do reverse movement in the height direction. In the process of stretching or compressing the rigid connecting rod, the rigid connecting rod can keep the central axis unchanged all the time, so that the sample is prevented from being eccentrically loaded and distorted.

Description

TECHNICAL FIELD

[0001] The utility model relates to composite material fan blade material performance test technical field, specifically, relate to a kind of polymer matrix composite shear fatigue test tooling. BACKGROUND

[0002] Compared with metal material, resin matrix polymer composite material has low density, high specific strength, high specific rigidity and good durability and other excellent characteristics.Currently, the fan blade and other components of commercial aircraft engine adopt resin matrix polymer composite material, which is a technical approach to realize engine weight reduction and efficiency improvement, and can meet the requirements of "low noise, low pollution and low cost" of new generation commercial aircraft engine.

[0003] During the use of composite material structure, various damage forms such as fiber fracture, matrix cracking, fiber / matrix interface debonding and delamination may occur.In order to fully develop the application potential of composite material and avoid catastrophic failure of composite material structure during use, it is necessary to conduct in-depth research on the damage mechanism of composite material.High interlaminar stress is one of the unique damage mechanisms of composite material, which is caused by interlaminar normal stress and shear stress of composite material, so the test of shear performance of composite material is the focus of engineering and research institutes.

[0004] Since the application range of ASTM D5379 standard is only static shear performance test, the recommended clamp can only provide unidirectional compression loading, and the test equipment supplier cannot realize shear fatigue test according to the standard clamp provided by ASTM D5379.Furthermore, shear fatigue test has a long cycle, and if load eccentricity occurs during loading, the sample may be twisted, thereby affecting the final fatigue test result.Therefore, the test equipment has higher requirements for shear tooling clamp for shear fatigue test. SUMMARY

[0005] The following gives a brief summary of one or more aspects to provide a basic understanding of these aspects.This summary is not an exhaustive overview of all contemplated aspects, and neither is it intended to identify key or critical elements of all aspects nor to delineate the scope of any or all aspects.Its only purpose is to give some concepts of one or more aspects in a simplified form to sequence the more detailed description given later.

[0006] The utility model aims to, for example, provide a kind of polymer matrix composite shear fatigue test tooling, which can improve the problem that composite material fan blade material characteristic detection tooling clamp can only provide unidirectional compression loading.

[0007] The embodiment of the utility model can be realized as follows:

[0008] The embodiment of the utility model provides a kind of polymer matrix composite material shear fatigue test tool, including upper equipment connection structure, lower equipment connection structure, rigid connecting rod, panel, substrate, sample upper chuck and sample lower chuck, the rigid connecting rod is vertically arranged between the upper equipment connection structure and the lower equipment connection structure, the top of the rigid connecting rod is detachably fixed with the upper equipment connection structure;

[0009] The panel is fixed with the bottom of the rigid connecting rod, the substrate is fixed with the lower equipment connection structure, the sample upper chuck is fixed with the panel, the sample lower chuck is fixed with the substrate, the sample upper chuck and the sample lower chuck are transversely misaligned, the side of the sample upper chuck is provided with first space, the side of the sample lower chuck is provided with second space, the first space of the sample upper chuck is used to accommodate half of sample, the second space of the sample lower chuck is used to accommodate the other half of sample, the height distance between the panel and the substrate is adjustable, so that the sample upper chuck and the sample lower chuck are reversely moved along the height direction, and the sample is sheared.

[0010] In addition, the polymer matrix composite material shear fatigue test tool provided by the embodiment of the utility model can also have the following additional technical features:

[0011] Optionally, the rigid connecting rod includes a first tapered portion, a cylindrical portion and a second tapered portion connected in sequence and integrally formed, the first tapered portion and the second tapered portion are symmetrically arranged relative to the cylindrical portion, and the cross sections of the first tapered portion and the second tapered portion gradually increase in a direction away from each other, the first tapered portion is fixed with the upper equipment connection structure, and the second tapered portion is fixed with the panel.

[0012] Optionally, the polymer matrix composite material shear fatigue test tool further includes a plurality of vertical guide mechanisms, and the plurality of vertical guide mechanisms are arranged at intervals between the panel and the substrate, so that the panel and the substrate always move up and down along the same height direction.

[0013] Optionally, the vertical guide mechanism includes a guide cylinder, a linear bearing and a guide column, the guide cylinder is fixed with the panel along the height direction, the guide column is fixed with the substrate along the height direction, the linear bearing is arranged in the guide cylinder, and the guide column and the linear bearing are slidingly fitted along the height direction, so that the guide cylinder and the guide column are coaxially arranged and slidingly fitted along the height direction.

[0014] Optionally, the number of vertical guide mechanisms is four, the four vertical guide mechanisms are distributed in quadrilateral, and the sample upper chuck and the sample lower chuck are arranged between the four vertical guide mechanisms.

[0015] Optionally, the polymer matrix composite shear fatigue test tool further comprises a first wedge, a second wedge, a first adjustable screw and a second adjustable screw; the first wedge is arranged in the first space in a transverse direction, the first adjustable screw is threadedly connected with the upper clamp and the first wedge; the second wedge is arranged in the second space in a transverse direction, and the second adjustable screw is threadedly connected with the upper clamp and the second wedge;

[0016] The first wedge is used for pressing the sample in the first space from top to bottom during rotation of the first adjustable screw, and the second wedge is used for pressing the sample in the second space from bottom to top during rotation of the second adjustable screw.

[0017] Optionally, the polymer matrix composite shear fatigue test tool further comprises a connecting rod and a spherical bearing, the connecting rod is connected with the spherical bearing, the top end of the connecting rod and the rigid connecting rod is switchably connected and fixed with the upper equipment connecting structure, and the bottom end of the spherical bearing and the rigid connecting rod is switchably connected and fixed with the panel.

[0018] Optionally, the connecting rod is a rectangular connecting rod, and the rectangular connecting rod is connected with the upper equipment connecting structure through a coupling bolt.

[0019] Optionally, the polymer matrix composite shear fatigue test tool further comprises an upper coupling disc and a lower coupling disc, the upper coupling disc is fixed with the upper equipment connecting structure, the lower coupling disc is fixed with the panel, and the upper coupling disc and the lower coupling disc are used for fixing the rigid connecting rod.

[0020] Optionally, the upper equipment connecting structure comprises an upper equipment clamping end and an upper equipment adaptive connecting disc, the lower equipment connecting structure comprises a lower equipment clamping end and a lower equipment adaptive connecting disc, the upper equipment adaptive connecting disc is fixed with the upper coupling disc, the upper equipment clamping end is fixed at the top of the upper equipment adaptive connecting disc and is used for being connected with equipment, the lower equipment adaptive connecting disc is fixed with the lower coupling disc, and the lower equipment clamping end is fixed at the bottom of the lower equipment adaptive connecting disc and is used for being connected with equipment.

[0021] The polymer matrix composite shear fatigue test tool has the following beneficial effects, for example:

[0022] The polymer matrix composite shear fatigue test tooling comprises an upper equipment connecting structure, a lower equipment connecting structure, a rigid connecting rod, a panel, a base plate, a sample upper chuck and a sample lower chuck, the rigid connecting rod is vertically arranged between the upper equipment connecting structure and the lower equipment connecting structure, and the top end of the rigid connecting rod is detachably fixed with the upper equipment connecting structure;

[0023] The panel is fixed with the bottom end of the rigid connecting rod, the base plate is fixed with the lower equipment connecting structure, the sample upper chuck is fixed with the panel, the sample lower chuck is fixed with the base plate, the sample upper chuck and the sample lower chuck are transversely arranged in a staggered manner, the side of the sample upper chuck is provided with a first space, the side of the sample lower chuck is provided with a second space, the first space of the sample upper chuck is used for accommodating one half of a sample, the second space of the sample lower chuck is used for accommodating the other half of the sample, and the height distance between the panel and the base plate is adjustable, so that the sample upper chuck and the sample lower chuck are reversely moved along the height direction to shear the sample.

[0024] The rigid connecting rod is vertically fixed between the upper equipment connecting structure and the panel, the central axis of the rigid connecting rod is kept unchanged during stretching or compression of the rigid connecting rod, stable stretching or compression load can be provided, and eccentric loading of the sample and twisting of the sample are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above features and advantages of the present application can be better understood after reading the detailed description of embodiments of the present application in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related functions or features can have the same or similar reference labels.

[0026] Figure 1 A structural schematic diagram of the polymer matrix composite shear fatigue test tooling provided by the embodiments of the present application is shown in the figure;

[0027] Figure 2 A front view of the rectangular connecting rod with a spherical bearing of the polymer matrix composite shear fatigue test tooling provided by the embodiments of the present application is shown in the figure;

[0028] Figure 3 A side view of the rectangular connecting rod with a spherical bearing of the polymer matrix composite shear fatigue test tooling provided by the embodiments of the present application is shown in the figure.

[0029] Icon: Polymer matrix composite shear fatigue test fixture-10; upper equipment clamping end-100; upper equipment adapter flange-110; lower equipment clamping end-120; lower equipment adapter flange-130; upper coupling flange-200; lower coupling flange-210; rigid link-220; rectangular link-230; spherical bearing-240; faceplate-300; baseplate-310; upper specimen collet-320; lower specimen collet-330; guide cylinder-400; linear bearing-410; guide post-420; first wedge-500; second wedge-510; first adjustable screw-520; second adjustable screw-530; specimen-600; coupling bolt-700. DETAILED DESCRIPTION

[0030] The utility model will be described in detail below in combination with the drawings and specific embodiments. Note that the aspects described below in combination with the drawings and specific embodiments are only exemplary and should not be understood as limiting the scope of protection of the utility model.

[0031] In the description of the utility model, it should be noted that if the terms "upper", "lower", "inner", "outer", "vertical" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, and not the orientation or positional relationship of the device or element indicated or implied, therefore, it cannot be understood as a limitation of the utility model.

[0032] At the same time, it should be noted that if the terms "first", "second" and the like are used only for differentiation description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the utility model, it should also be noted that unless otherwise specified or limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, integrally connected, or detachably connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements, etc. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] The following will be described in detail Figures 1 to 3 The polymer matrix composite shear fatigue test fixture 10 provided in the embodiment will be described in detail.

[0035] Please refer to Figure 1The utility model discloses an embodiment provides a kind of polymer matrix composite material shear fatigue test tool 10, including upper equipment connection structure, lower equipment connection structure, rigid link 220, panel 300, substrate 310, sample upper chuck 320 and sample lower chuck 330, rigid link 220 vertically between upper equipment connection structure and lower equipment connection structure is arranged, and the top of rigid link 220 is detachably fixed with upper equipment connection structure;

[0036] Panel 300 is fixed with the bottom of rigid link 220, substrate 310 is fixed with lower equipment connection structure, sample upper chuck 320 is fixed with panel 300, sample lower chuck 330 is fixed with substrate 310, sample upper chuck 320 and sample lower chuck 330 are transversely direction misplacement setting, the side of sample upper chuck 320 is provided with first space, the side of sample lower chuck 330 is provided with second space, the first space of sample upper chuck 320 is used to accommodate half part of sample, the second space of sample lower chuck 330 is used to accommodate other half part of sample, the height distance between panel 300 and substrate 310 is adjustable, to make sample upper chuck 320 and sample lower chuck 330 along height direction make reverse motion to sample 600 during shear effect.

[0037] One end of sample is clamped into first space, and the other end of sample is clamped into second space, sample upper chuck 320 and sample lower chuck 330 always along height direction make reverse motion, when sample upper chuck 320 and sample lower chuck 330 along height direction make mutual close movement, sample upper chuck 320 compresses sample downward, and sample lower chuck 330 compresses sample upward;When sample upper chuck 320 and sample lower chuck 330 along height direction make mutual away movement, sample upper chuck 320 compresses sample upward, and sample lower chuck 330 compresses sample downward, through mutual close compression of sample upper chuck 320 and sample lower chuck 330, or mutual away stretching of sample upper chuck 320 and sample lower chuck 330, can carry out shear load test to sample 600.

[0038] In the embodiment, rigid link 220 is vertically fixed between upper equipment connection structure and panel 300, in the process of stretching or compressing rigid link 220, rigid link 220 can always keep central axis unchanged, can provide stable stretching or compression load, avoids that sample is eccentric under load, and produces distortion.

[0039] Rigid link 220 is suitable for shear fatigue test of all stress ratio conditions, and the cross section of link is designed as circular cross section. Especially for shear fatigue test of R=-1, fatigue load is directly transmitted to sample through link. The fatigue test of stress ratio R=0.1 and R=-1 can be realized, wherein stress ratio (stress ratio) is the ratio of minimum stress and maximum stress in any single cycle in fatigue test.

[0040] Referring to Figure 1 In this embodiment, the rigid connecting rod 220 comprises a first tapered portion, a cylindrical portion and a second tapered portion connected in sequence and integrally formed, the first tapered portion and the second tapered portion are symmetrically arranged relative to the cylindrical portion, and the cross section of the first tapered portion and the cross section of the second tapered portion gradually increase in the direction away from each other, the first tapered portion is fixed with the upper equipment connecting structure, and the second tapered portion is fixed with the panel 300.

[0041] The two ends of the rigid connecting rod 220 adopt a tapered body, which can increase the connection contact area of the upper and lower ends of the rigid connecting rod 220, improve the fixing stability of the rigid connecting rod 220, and the middle part of the rigid connecting rod 220 adopts a cylindrical portion, which can not only ensure the strength, but also reduce the weight, and can ensure that the center position remains unchanged during stretching and compression, and can complete the fatigue test of stress ratio R=0.1 tension and R=-1 compression shear.

[0042] Referring to Figure 1 In this embodiment, the polymer matrix composite shear fatigue test tool 10 further comprises a plurality of vertical guide mechanisms, and the plurality of vertical guide mechanisms are arranged between the panel 300 and the base plate 310 in a spaced manner, so that the panel 300 and the base plate 310 always move up and down along the same height direction.

[0043] The plurality of vertical guide mechanisms ensure the verticality of the up and down movement of the upper specimen chuck 320 and the lower specimen chuck 330, avoid the eccentricity of the specimen under load during the process of applying load to the specimen 600, and improve the test precision.

[0044] Referring to Figure 1 In this embodiment, the vertical guide mechanism comprises a guide cylinder 400, a linear bearing 410 and a guide column 420; the guide cylinder 400 is fixed with the panel 300 along the height direction, the guide column 420 is fixed with the base plate 310 along the height direction, the linear bearing 410 is arranged in the guide cylinder 400, and the guide column 420 and the linear bearing 410 are slidingly matched along the height direction, so that the guide cylinder 400 and the guide column 420 are coaxially arranged and slidingly matched along the height direction.

[0045] The guide column 420 and the guide cylinder 400 are slidingly matched, and the linear bearing 410 ensures that the up and down sliding between the guide column 420 and the guide cylinder 400 will not be skewed, improves the vertical precision of the up and down movement of the upper specimen chuck 320 and the lower specimen chuck 330, and avoids the eccentricity of the specimen under load, which produces distortion.

[0046] Referring to Figure 1 In this embodiment, the number of vertical guide mechanisms is four, the four vertical guide mechanisms are distributed in a quadrilateral shape, and the upper specimen chuck 320 and the lower specimen chuck 330 are arranged between the four vertical guide mechanisms.

[0047] The number of vertical guide mechanisms can be set according to actual needs. In the embodiment, the number of vertical guide mechanisms is multiple, which improves the processing and assembly difficulty, thereby improving the vertical precision of the upward and downward movement of the upper specimen chuck 320 and the lower specimen chuck 330, and improving the test precision.

[0048] Referring to Figure 1 In the embodiment, the polymer matrix composite shear fatigue test tool 10 further comprises a first wedge block 500, a second wedge block 510, a first adjustable screw 520, and a second adjustable screw 530. The first wedge block 500 is slidingly arranged in the first space in the transverse direction, and the first adjustable screw 520 is threadedly connected with the upper specimen chuck 320 and the first wedge block 500. The second wedge block 510 is slidingly arranged in the second space in the transverse direction, and the second adjustable screw 530 is threadedly connected with the upper specimen chuck 320 and the second wedge block 510.

[0049] The first wedge block 500 is used to press the specimen in the first space from top to bottom during the rotation of the first adjustable screw 520, and the second wedge block 510 is used to press the specimen in the second space from bottom to top during the rotation of the second adjustable screw 530.

[0050] The first wedge block 500 and the second wedge block 510 are used to clamp the specimen in the first space and the second space. The first wedge block 500 and the second wedge block 510 make the clamping space of the first space and the second space adjustable, and can test specimens of different sizes.

[0051] Referring to Figure 2 and Figure 3 In the embodiment, the polymer matrix composite shear fatigue test tool 10 further comprises a connecting rod and a spherical bearing 240. The connecting rod is connected with the spherical bearing 240. The top ends of the connecting rod and the rigid connecting rod 220 are switchably connected and fixed with the upper equipment connecting structure. The bottom ends of the spherical bearing 240 and the rigid connecting rod 220 are switchably connected and fixed with the panel 300.

[0052] The spherical bearing 240 can automatically center in the case of stretching of the equipment, thereby ensuring that the specimen is eccentrically loaded and twisted in the case of performing a tensile load test.

[0053] The rigid connecting rod 220 can perform a tensile or compressive load test. When R=-1, a compressive fatigue test is performed, and when R=0.1, a tensile fatigue test is performed. When only a shear fatigue test of R=0.1 is performed, the rigid connecting rod 220 can be replaced with a rectangular connecting rod 230 with a spherical bearing 240. Figure 2As shown. Only need to replace the rigid connecting rod 220 part of the rectangular connecting rod 230 part, including, the lower connecting disc 210, spherical bearing 240, rectangular connecting rod 230, connecting bolt and the upper connecting disc 200.

[0054] Referring to Figure 2 and Figure 3 , in this embodiment, the connecting rod is a rectangular connecting rod 230, and the rectangular connecting rod 230 is connected to the upper equipment connecting structure through a connecting bolt 700.

[0055] The rectangular connecting rod 230 has a large cross-sectional area and can provide a connection and fixing position with the upper equipment connecting structure.

[0056] Referring to Figure 1 , Figure 2 and Figure 3 , in this embodiment, the polymer matrix composite shear fatigue test tool 10 further comprises an upper connecting disc 200 and a lower connecting disc 210, the upper connecting disc 200 is fixed with the upper equipment connecting structure, and the lower connecting disc 210 is fixed with the panel 300, and the upper connecting disc 200 and the lower connecting disc 210 are used to fix the rigid connecting rod 220.

[0057] The upper connecting disc 200 and the lower connecting disc 210 can increase the contact area of the connecting position and improve the stability of the connection and fixation of the rigid connecting rod 220 or the spherical bearing 240.

[0058] The sample is fixed in the upper and lower sample clamps by a wedge and an adjustable screw, the panel 300 is integrated with the upper sample clamp 320 and is fastened and connected with the lower connecting disc 210 through a bolt. The base plate 310 is integrated with the lower sample clamp 330 and is fastened and connected with the equipment adapter disc through a bolt. Through the four pairs of guide cylinders 400, linear bearings 410 and guide columns 420, the upper sample clamp 320 and the lower sample clamp 330 can realize relative sliding. The linear bearing 410 reduces the friction force when sliding, and the four guide columns 420 ensure the coaxiality during loading.

[0059] Referring to Figure 1 , Figure 2 and Figure 3 , in this embodiment, the upper equipment connecting structure comprises an upper equipment clamping end 100 and an upper equipment adapter disc 110; the lower equipment connecting structure comprises a lower equipment clamping end 120 and a lower equipment adapter disc 130, the upper equipment adapter disc 110 is fixed with the upper connecting disc 200, and the upper equipment clamping end 100 is fixed on the top of the upper equipment adapter disc 110 for connecting with the equipment; the lower equipment adapter disc 130 is fixed with the lower connecting disc 210, and the lower equipment clamping end 120 is fixed on the bottom of the lower equipment adapter disc 130 for connecting with the equipment.

[0060] The upper equipment adapting connecting disc 110 is fixed with the upper connecting disc 200, and the lower equipment adapting connecting disc 130 is fixed with the lower connecting disc 210, so as to increase the contact area, improve the connection strength and stability, and facilitate installation and replacement.

[0061] The equipment connecting part includes the upper and lower equipment adapting connecting discs 130 and the equipment clamping end. According to different equipment models, the equipment clamping end can be appropriately adjusted. For example, for the test equipment with the upper chuck moving, the base plate 310 can be directly fixed on the platform below the equipment, and the upper equipment clamping end can be designed as a circular or flat plate type boss for clamping by the upper chuck.

[0062] According to the polymer matrix composite shear fatigue test tool 10 provided in the embodiment, the working principle of the polymer matrix composite shear fatigue test tool 10 includes: a special shear fatigue test tool is designed to realize the shear fatigue test based on the V-shaped notched beam sample, there are clamping parts above and below the clamp, the rigid connecting rod 220 is adopted for the shear fatigue test under all stress ratio conditions, and the cross section of the connecting rod is designed as a circular cross section. In particular for the shear fatigue test of R=-1, the fatigue load is directly transmitted to the sample through the connecting rod.

[0063] For the tensile load shear fatigue test of R=0.01, the connecting rod part adopts the rectangular connecting rod 230 with the spherical bearing 240 as shown in the figure. Figure 2 The rigid connecting rod 220 part is replaced by the rectangular connecting rod 230 part, the rectangular connecting rod 230 transmits the load through the spherical bearing 240, the spherical bearing 240 has a self-centering effect when subjected to a tensile load, which is beneficial to improving the coaxiality of the sample under load, and the rectangular connecting rod 230 is fixed with the upper connecting disc 200 through the coupling bolt 700.

[0064] The composite material shear fatigue test tool is suitable for composite materials prepared under different process conditions such as autoclave and RTM molding, can realize the fatigue test requirements of different stress ratios of out-of-plane and in-plane shear of the composite material, and solves the problem of shear fatigue test under conditions such as R=-1 and R=0.01.

[0065] The polymer matrix composite shear fatigue test tool 10 provided in the embodiment has at least the following advantages:

[0066] The shear fatigue test tool realizes that the upper and lower chucks of the equipment can be clamped through the rigid connecting rod 220 part, the sample clamping part and the equipment connecting part, the equipment load can exert the fatigue load in two directions of tension and compression on the sample 600, a special composite material shear fatigue test tool is designed, and the problem that the composite material shear fatigue test cannot be implemented is solved.

[0067] The shearing fatigue test tool can realize fatigue test of V-shaped notch beam sample, ensure coaxiality of loading in test process, and avoid load eccentricity; the shearing fatigue test tool can realize fatigue test under tensile and compression fatigue load, such as under stress ratio R=-1 and R=0.01.

[0068] The vertical guide mechanism is provided with four pairs of guide cylinders 400, linear bearings 410 and guide columns 420, so as to ensure coaxiality in the fatigue test process, avoid load eccentricity of the sample, and avoid torsion.

[0069] The shearing fatigue test tool is assembled in a split mode, and by replacing the rigid connecting rod 220 with a rectangular connecting rod 230 provided with a spherical bearing 240, the coaxiality in the tensile fatigue test process can be further improved.

[0070] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A polymer matrix composite shear fatigue test fixture characterized by, The application relates to a polymer-based composite material shear fatigue test tool. The polymer-based composite material shear fatigue test tool comprises an upper equipment connecting structure, a lower equipment connecting structure, a rigid connecting rod, a panel, a base plate, an upper sample chuck and a lower sample chuck. The rigid connecting rod is vertically arranged between the upper equipment connecting structure and the lower equipment connecting structure, and the top end of the rigid connecting rod is detachably fixed with the upper equipment connecting structure. The panel is fixed with the bottom end of the rigid connecting rod, the base plate is fixed with the lower equipment connecting structure, the upper sample chuck is fixed with the panel, the lower sample chuck is fixed with the base plate, the upper sample chuck and the lower sample chuck are arranged in a transverse direction, the side of the upper sample chuck is provided with a first space, the side of the lower sample chuck is provided with a second space, the first space of the upper sample chuck is used for accommodating one half of a sample, the second space of the lower sample chuck is used for accommodating the other half of the sample, and the height distance between the panel and the base plate is adjustable so that the upper sample chuck and the lower sample chuck can perform reverse movement along the height direction to shear the sample. The rigid connecting rod comprises a first tapering portion, a cylindrical portion and a second tapering portion which are sequentially connected and integrally formed.

2. The polymeric matrix composite shear fatigue test fixture of claim 1, wherein, The first tapering portion and the second tapering portion are symmetrically arranged relative to the cylindrical portion, the cross section of the first tapering portion and the cross section of the second tapering portion gradually increase in a direction away from each other, the first tapering portion is fixed with the upper equipment connecting structure, and the second tapering portion is fixed with the panel.

3. The polymeric matrix composite shear fatigue test fixture of claim 1, wherein, The polymer-based composite material shear fatigue test tool further comprises a plurality of vertical guide mechanisms which are arranged between the panel and the base plate in a spaced manner so that the panel and the base plate always move up and down along the same height direction.

4. The polymeric matrix composite shear fatigue test fixture of claim 3, wherein, The vertical guide mechanism comprises a guide cylinder, a linear bearing and a guide column.

5. The polymeric matrix composite shear fatigue test fixture of claim 4, wherein, The guide cylinder is fixed with the panel along the height direction, the guide column is fixed with the base plate along the height direction, the linear bearing is arranged in the guide cylinder, and the guide column and the linear bearing are slidably connected along the height direction so that the guide cylinder and the guide column are coaxially arranged and slidably connected along the height direction.

6. The polymeric matrix composite shear fatigue test fixture of claim 1, wherein, The number of the vertical guide mechanisms is four, the four vertical guide mechanisms are distributed in a quadrilateral shape, and the upper sample chuck and the lower sample chuck are arranged between the four vertical guide mechanisms. The polymer-based composite material shear fatigue test tool further comprises a first wedge-shaped block, a second wedge-shaped block, a first adjustable screw and a second adjustable screw. The first wedge-shaped block is slidably arranged in the first space along the transverse direction, the first adjustable screw is threadedly connected with the upper sample chuck and the first wedge-shaped block, the second wedge-shaped block is slidably arranged in the second space along the transverse direction, and the second adjustable screw is threadedly connected with the upper sample chuck and the second wedge-shaped block. The first wedge-shaped block is used for pressing the sample in the first space from top to bottom during the rotation of the first adjustable screw, and the second wedge-shaped block is used for pressing the sample in the second space from bottom to top during the rotation of the second adjustable screw.

7. The polymeric matrix composite shear fatigue test fixture of any of claims 1-6, wherein, The polymer matrix composite shear fatigue test tool further comprises a connecting rod and a spherical bearing, the connecting rod is connected with the spherical bearing, the top end of the connecting rod and the rigid connecting rod is switchably connected and fixed with the upper equipment connecting structure, and the bottom end of the spherical bearing and the rigid connecting rod is switchably connected and fixed with the panel.

8. The polymeric matrix composite shear fatigue test fixture of claim 7, wherein, The connecting rod is a rectangular connecting rod, and the rectangular connecting rod is connected with the upper equipment connecting structure through a coupling bolt.

9. The polymeric matrix composite shear fatigue test fixture of claim 1, wherein, The polymer matrix composite shear fatigue test tool further comprises an upper coupling disc and a lower coupling disc, the upper coupling disc is fixed with the upper equipment connecting structure, the lower coupling disc is fixed with the panel, and the upper coupling disc and the lower coupling disc are used for fixing the rigid connecting rod.

10. The polymeric matrix composite shear fatigue test fixture of claim 9, wherein, The upper equipment connecting structure comprises an upper equipment clamping end and an upper equipment adaptive connecting disc, and the lower equipment connecting structure comprises a lower equipment clamping end and a lower equipment adaptive connecting disc; the upper equipment adaptive connecting disc is fixed with the upper coupling disc, and the upper equipment clamping end is fixed at the top of the upper equipment adaptive connecting disc for being connected with equipment; the lower equipment adaptive connecting disc is fixed with the lower coupling disc, and the lower equipment clamping end is fixed at the bottom of the lower equipment adaptive connecting disc for being connected with equipment.

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