Test assembly for material tensile shear performance testing

Abstract

The present invention relates to a test assembly for material tensile shear performance testing, the test assembly comprising: a loading disc; and a clamp, the clamp comprising an upper end clamp and a lower end clamp, the upper end clamp and the lower end clamp clamping an edge portion of the loading disc from above and below respectively via respective clamping slots, the clamping slots of the clamp being shaped to fit the edge portion of the loading disc such that relative movement of the clamping slots and the edge portion is prevented when the clamp is clamped and the edge portion is allowed to slide along the clamping slots and the loading disc is allowed to rotate when the clamp is unclamped.

Description

TECHNICAL FIELD

[0001] The present application relates to a test assembly for material tensile shear performance test, in particular to a tensile shear composite loading test device for a tensile testing machine to obtain arbitrary proportional loading of tensile force and shear force by changing loading angle. BACKGROUND

[0002] During flight, the structural load acting on the aircraft is not pure uniaxial form, and the structure usually fails in the form of mixed loading, such as tensile shear and compressive shear. Generally, the influence of mixed loading mode on mechanical properties is not evaluated due to cost considerations, but it is crucial for predicting the fracture behavior of structural materials, such as crack path and crack propagation rate. Therefore, in order to accurately characterize the mechanical behavior of materials, it is necessary to explore the material behavior under mixed loading form through tests.

[0003] In the prior art, there are test devices that allow variable proportional loading, such as an arbitrary proportional loading tensile / compressive shear composite loading test device and method (CN115201030A) for material tensile / compressive shear strength test, and a composite material tensile / compressive-shear composite fatigue loading device and test method (CN116499903A) for composite material tensile / compressive shear static or fatigue strength test.

[0004] However, for an arbitrary proportional loading tensile / compressive shear composite loading test device, the device design is complex, with 4 loading discs, and the debugging and assembly process is complex. In order to achieve a large range of changes in loading ratio, it is necessary to disassemble and assemble the bolts, and the angle selection involves higher requirements for bolt hole positioning and accuracy. For a composite material tensile / compressive-shear composite fatigue loading device, the device design and debugging assembly are complex, with 4 loading discs, and the bolt hole positioning and accuracy requirements are high, and the arbitrary adjustment of the loading ratio cannot be achieved.

[0005] In addition, for the thin-walled structure commonly used in aircraft structures, the thickness of the test piece to be tested is relatively thin. In the test devices involved in the prior art, for relatively thin test pieces, according to ASTM D6484 Standard Test Method for Open Hole Compressive Strength of Polymer Matrix Composite Laminates, under compressive load, if the test piece is not supported by an in-plane clamp, the expected test results cannot be achieved.

[0006] Therefore, it is urgent to propose a test assembly for material tensile shear performance test that can easily adjust the loading ratio and is suitable for thin plate-shaped material test pieces of metal or composite materials. SUMMARY

[0007] The inventors provide a test assembly for material tensile shear performance test, which is simple in structure, easy to adjust loading ratio, has no hole positioning and precision requirement, and is simple to operate.

[0008] In a first example of the test assembly, the test assembly comprises: a loading disc; and a clamp, the clamp comprising an upper end clamp and a lower end clamp, the upper end clamp and the lower end clamp clamping an edge portion of the loading disc from above and below respectively via respective clamping grooves, the clamping grooves of the clamp being shaped to fit the edge portion of the loading disc such that relative motion between the clamping grooves and the edge portion is prevented when the clamp is clamped and allowed when the clamp is unclamped.

[0009] In a second example of the test assembly, optionally comprising the first example, the clamp comprises a first clamp half and a second clamp half, wherein the first clamp half and the second clamp half each comprise a respective first clamping groove half and a second clamping groove half that cooperate to form the clamping groove, the first clamping groove half and the second clamping groove half abutting the edge portion from two sides of the loading disc, facilitating placement of the edge portion of the loading disc and the protruding portion into the clamping groove, and placement of the loading disc and the clamp into position.

[0010] In a third example of the test assembly, optionally comprising one or more of the first example and the second example, the clamp comprises an interface groove shaped to fit a joint in an interface portion of a tensile arm of a testing machine, and the first clamp half and the second clamp half each comprise a respective first interface groove half and a second interface groove half that cooperate to form the interface groove, the first interface groove half and the second interface groove half abutting the joint from two sides of the joint, the joint being easily accommodated in the interface groove.

[0011] In a fourth example of the test assembly, optionally comprising one or more of the first example to the third example, the clamp is wedge-shaped shaped to fit the interface portion of the testing machine, the clamp being easily placed into the interface portion of the testing machine.

[0012] In a fifth example of the test assembly, optionally comprising one or more of the first example to the fourth example, the edge portion of the loading disc comprises a protruding portion shaped to fit the clamping groove and protruding towards two sides of the loading disc.

[0013] In a sixth example of the test assembly, optionally comprising one or more of the first example to the fifth example, the edge portion of the loading disc comprises a plurality of angle guide lines arranged at intervals in a circumferential direction of the loading disc, and the angle guide lines are, for example, at intervals of 2 degrees, 5 degrees and / or 10 degrees in the circumferential direction according to actual needs.

[0014] In a seventh example of the test assembly, optionally including one or more of the first through sixth examples, the angle cue line is any form of linear pattern capable of visibly cueing the operator, including but not limited to an incised recess, an embossed relief, or a colored material.

[0015] In an eighth example of the test assembly, optionally including one or more of the first through seventh examples, the loading disc includes a first loading disc half and a second loading disc half, the first loading disc half and the second loading disc half each including a respective recess for securing the test piece in the middle region, and the test assembly further includes clamping tabs, the two ends of the test piece in the tensile direction being clamped between the two recesses of the loading disc and the two clamping tabs, respectively.

[0016] In a ninth example of the test assembly, optionally including one or more of the first through eighth examples, the clamping tab has a thickness-reduced portion, the thickness-reduced portion at least partially covering the end of the test piece in the tensile direction, and the sum of the thickness of the thickness-reduced portion and the thickness of the test piece is at least not less than the thickness of the clamping tab at the remaining positions other than the thickness-reduced portion.

[0017] In a tenth example of the test assembly, optionally including one or more of the first through ninth examples, the clamping tab has a clamping tab fastener hole at the remaining positions other than the thickness-reduced portion, and the recess of the loading disc has a corresponding recess fastener hole, and the test assembly further includes a fastener assembly clamping the clamping tab and the test piece to the loading disc through the clamping tab fastener hole and the recess fastener hole.

[0018] The present application overcomes the shortcomings of the disc-type tensile shear test device that can only realize specific angle composite loading or inconvenient switching operation of loading angle, and high positioning precision requirement of assembly holes, overcomes the shortcomings of the double-shaft test device that design and assembly are complex, and two groups of actuators in horizontal and vertical directions are needed to realize combined loading, and overcomes the shortcomings of the tensile shear test piece clamping that needs to be holed.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The present application has simple design, and only one set of loading system and two loading discs are needed to realize combined loading.

[0021] 2. The present application is simple to manufacture, the bolt holes on the device are used for clamping the test piece, rather than for adjusting the loading angle, and there is no hole positioning and precision requirement, and the problems of loading eccentricity and slight deflection of the test piece during loading do not occur.

[0022] 3. The present application is simple to assemble, does not need additional loading joints, and can be directly assembled on a universal testing machine, and the test piece itself does not need other additional assembly except for clamping.

[0023] 4、The present application is simple to operate, and the tensile-shear loading ratio is adjusted by rotating the loading disc by a certain angle, without disassembling the bolts, and the loading disc is provided with scales, facilitating angle adjustment.

[0024] 5、The present application is suitable for sheet-shaped material test pieces of metal or composite materials. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to describe the embodiments of the above and other features of the present application, a more particular description will be rendered by reference to the accompanying drawings. It is appreciated that these drawings depict only example embodiments of the application and are therefore not to be considered limiting of its scope. The application will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0026] Figure 1 is a perspective view of a test assembly for material tensile-shear performance testing according to an embodiment of the present application in operation;

[0027] Figure 2 is an exploded view of the test assembly according to an embodiment of the present application;

[0028] Figure 3 is an elevational view of a portion of a loading disc of the test assembly according to an embodiment of the present application;

[0029] Figure 4 is a perspective view of a clamping piece of the test assembly according to an embodiment of the present application;

[0030] Figure 5 is a side view of the test assembly clamping a test piece according to an embodiment of the present application;

[0031] Figure 6 is an elevational view of a test piece of the test assembly according to an embodiment of the present application;

[0032] Figure 7 is another elevational view of a test piece of the test assembly according to an embodiment of the present application; and

[0033] Figure 8 is an elevational view of a loading disc of the test assembly under tensile force during testing according to an embodiment of the present application.

[0034] The drawings are not necessarily to scale and the dimensions of the various drawings are merely illustrative and are not necessarily strictly adhered to in scale, but are intended to more clearly illustrate the subject matter. Other relative dimensions can be used in other embodiments.

[0035] Throughout this document and in the following claims, the same features appearing in different drawings are denoted by the same or similar reference numerals.

[0036] List of reference numerals in the attached diagram:

[0037] 1 Test Component

[0038] 100 Loading disk

[0039] 101 First loading disk half

[0040] 102 Second loading disk half

[0041] 110 Edge

[0042] 111 Protrusion

[0043] 112 Angle Indicator Line

[0044] 120 Recess

[0045] 121 Recessed fastener hole

[0046] 200 clamps

[0047] 200a Upper Clamp

[0048] 200b Lower end clamp

[0049] 201 First clamp half

[0050] 202 Second clamp half

[0051] 210 Clamping slot

[0052] 211 First clamping groove half

[0053] 212 Second clamping slot half

[0054] 220 Interface Slot

[0055] 221 First interface slot half

[0056] 222 Second interface slot half

[0057] 300 test pieces

[0058] 400 clamping plate

[0059] 401 Clamping plate fastener hole

[0060] 410 Thickness Reduction Section

[0061] 500 Fastener Assembly Detailed Implementation

[0062] First, the present invention is generally directed to testing devices related to testing the tensile shear properties of materials in any manufacturing field. In particular, the present invention is directed to a tensile-shear combined loading testing device that allows for arbitrary ratio loading of tensile and shear forces by varying the loading angle, for example, for testing the properties of thin sheet-shaped test pieces, but is not limited to testing of this type of test pieces.

[0063] The term "clamping" as used herein is intended to describe two components abutting a third component from both sides of at least a portion of the third component, enabling the three to maintain their relative positions to each other, and enabling force to be transmitted from one component to another.

[0064] "Shape adaptation" in the context of the present invention is intended to describe that at least a portion of one component can be shaped to mate with at least a portion of another component, which "shape adaptation" does not require a complete shape match, but can be a partial shape match, such as one component being spherical and the other component having a curved recess, or a key of one component being partially received in a slot of another component, as long as there is a force transmission path, no matter how many, within the scope of the present invention.

[0065] Directional terms as used herein, such as "top," "bottom," "upper," "lower," are used for ease of description to describe the orientations of embodiments shown in the drawings. Unless otherwise stated, the directional terms are not absolute up, down, horizontal, vertical, etc., and should not be construed to limit the invention to any particular orientation.

[0066] The terms "comprising," "having," "including," and "containing," and variations thereof, as used herein, are intended to be open-ended transitional phrases, terms, or words that require the presence of the named ingredients / steps and that also permit the presence of other ingredients / steps.

[0067] In the present invention, unless specifically stated otherwise, the terms "first," "second," and / or the like are not intended to imply any order, location, number, or importance, but are simply used to identify one element, component, region, and / or location from another element, component, region, and / or location.

[0068] The terms "about" and "approximately" can be used to include any numerical value having slight deviations from the value in question, without changing the basic function of the numerical value. Generally, the terms "about" and "approximately" can refer to plus or minus 10% of the number in question. When used with a range, "about" and "approximately" also disclose the range defined by the absolute values of the two endpoints, e.g., "about 2 to about 4" also discloses the range "from 2 to 4." All ranges disclosed herein are inclusive of the endpoints, and the endpoints are independently combinable with each other (e.g., ranges of "from 2 to 4" are inclusive of the endpoints 2 and 4, as well as all intermediate values).

[0069] Numerical values as used herein should be understood to include the same numerical value if modified by a term or terms such as "about," "approximately," "substantially," or "essentially." A value modified by one or more of these terms should be interpreted in the context of the application and should not be overly construed as exact.

[0070] Finally, the numerical values given in the various embodiments are to be regarded only as examples and not as limiting the scope of the present application.

[0071] In one non-limiting example, the tensile testing machine to which the present application relates is generally referred to as a "universal tensile testing machine", which can include an upper portion, a lower portion of tensile arms and a middle test space, and the interface portion of the tensile arms is configured to be connected with the test assembly 1 for material tensile shear property test of the present application, which can have a wedge-shaped accommodation space and include a joint therein.

[0072] In one non-limiting example, the test assembly 1 for material tensile shear property test of the present application includes a loading disc 100, which can be separable in shape and include two or more components and have a generally partial disc shape as a whole.

[0073] The edge portion 110 of the loading disc 100 can include a protruding portion 111 protruding towards both sides of the loading disc 100, which is preferably annularly surrounded in the circumferential direction of the loading disc 100.

[0074] The edge portion 110 of the loading disc 100 can include a plurality of angle prompt lines 112 arranged at intervals in the circumferential direction of the loading disc 100. These angle prompt lines 112 are used to conveniently prompt the operator that the loading disc 100 has been rotated by an angle.

[0075] The angle prompt lines 112 can be equidistantly or non-equidistantly spaced, for example, at an angle of 2 degrees from each other at a smaller angle of rotation compared to the initial state and at an angle of 5 degrees and / or 10 degrees from each other at a larger angle of rotation compared to the initial state according to actual needs.

[0076] The angle prompt lines 112 can be any form of line pattern capable of giving a clear prompt to the operator, such as but not limited to engraved intaglio, embossed relief or colored material, and the lines can be, for example but not limited to, solid lines, dashed lines, dot-dash lines, etc.

[0077] In one non-limiting example, the test assembly 1 for material tensile shear property test of the present application includes a clamp 200 for clamping the edge portion 110 of the loading disc 100. In order to be suitable for the tensile testing machine described above, the clamp 200 includes an upper end clamp 200a and a lower end clamp 200b, corresponding to the upper portion, the lower portion of the tensile arms of the tensile testing machine.

[0078] The clamp 200 can have a clamping groove 210 for clamping the edge portion 110 of the loading disc 100, and the upper end clamp 200a and the lower end clamp 200b clamp the edge portion 110 of the loading disc 100 from above and below, respectively, by the respective clamping groove 210.

[0079] The clamping groove 210 of the clamp 200 can be shaped to fit the edge portion 110 of the loading disc 100, the clamping groove 210 can have a curvature corresponding to the edge portion 110, i.e. have the curvature of the circular outer circumference of the loading disc 100, ensuring that the clamping groove 210 is prevented from moving relative to the edge portion 110 when the clamp 200 is clamped, and allowing the edge portion 110 to slide along the clamping groove 210 when the clamp 200 is released. In other words, viewed from the loading disc 100, the edge portion 110 of the loading disc 100 is clamped from above and below by the clamp 200, and is allowed to rotate around its own center when the clamp 200 is released.

[0080] The outer shape of the clamp 200 can be a wedge shape that fits the wedge-shaped accommodation space in the interface portion of the stretching arm of the testing machine, and the clamp can be easily placed into the interface portion of the testing machine. In addition, the clamp 200 can include an interface groove 220 that fits the shape of the joint in the interface portion of the stretching arm of the testing machine, and the clamp 200 can be fixed to the interface portion of the testing machine by the combination of the joint-interface groove-wedge-shaped accommodation space.

[0081] The clamp 200 can include a first clamp half 201 and a second clamp half 202, preferably two clamp halves that move independently of each other, wherein the first clamp half 201 and the second clamp half 202 each include a corresponding first clamping groove half 211 and a second clamping groove half 212 that cooperate to form the clamping groove 210, the two clamping groove halves can abut the edge portion 110 of the loading disc 100, preferably the protrusion 111 at the edge portion 110, from both sides of the loading disc 100. By moving the first clamp half 201 away from the second clamp half 202, a gap can be created for at least a portion of the loading disc 100 to easily pass through, facilitating the placement of the edge portion 110 of the loading disc 100, as well as the protrusion 111, into the clamping groove 210, allowing the loading disc 100 to be placed in position with the clamp 200.

[0082] In addition, the interface groove 220 of the clamp 200, which is fixedly coupled to the interface of the testing machine, can be formed in a similar manner, i.e. the first clamp half 201 and the second clamp half 202 of the clamp 200 can each include a first interface groove half 221 and a second interface groove half 222 that correspond to form the interface groove 220, the two interface groove halves abut the joint in the interface portion of the stretching arm of the testing machine from both sides of the joint, thus the joint can be easily accommodated in the interface groove 220.

[0083] In one non-limiting example, the test assembly 1 for material tensile shear property testing of the present application includes a test piece 300, the specific shape of which is designed according to a standard test protocol, which will be described in detail below.

[0084] In one non-limiting example, the loading disc 100 can include a first loading disc half 101 and a second loading disc half 102, preferably two loading disc halves that move independently of each other, and the two ends of the test piece 300 in the tensile direction are fixed to the two loading disc halves of the loading disc 100, respectively.

[0085] Preferably, the first loading disc half 101 and the second loading disc half 102 are both substantially semicircular, and are mated to form a complete disc shape. It can be understood that the shape of the loading disc half is not limited thereto, but can be any shape as long as it can be mated to provide fixation to the two ends of the test piece 300 and provide a disc-shaped edge.

[0086] The present application will be further described below in conjunction with specific embodiments and drawings, more details are set forth in the following description in order to fully understand the present application, but the present application can be implemented in many different ways other than described, and those skilled in the art can make similar generalizations, deductions, and extrapolations according to actual application without departing from the spirit of the present application, therefore the protection scope of the present application should not be limited by the content of this specific embodiment.

[0087] A coordinate system is provided in the drawings for reference, the x-axis can be a vertical axis (e.g., parallel to the direction of gravity), and the y-axis can be a horizontal axis (e.g., parallel to the horizontal direction).

[0088] Figure 1 A perspective view of the test assembly 11 for material tensile shear property testing according to an embodiment of the present application is schematically shown. The test assembly 1 for material tensile shear property testing of the present application further includes a clamping sheet 400 and a fastener assembly 500 for fixing the test piece 300. The fastener assembly 500 fixes the clamping sheet 400 to the loading disc 100 and the test piece 300 is clamped between the clamping sheet 400 and the loading disc 100.

[0089] In this embodiment, the flange portion 111 of the loading disc 100 has a T-shaped cross-sectional shape with respect to the edge portion 110. The angle guide line 112 is not only arranged on the outer periphery of the edge portion 110, but also on the surface of the flange portion 111 facing the two sides of the loading disc 100.

[0090] Figure 2An exploded view of the test assembly 1 according to an embodiment of the present application is shown schematically. The first loading disc half 101 and the second loading disc half 102 each comprise a respective recess 120 for fixing the test piece 300 in the middle region. The two ends of the test piece 300 in the tensile direction can be clamped between the two recesses 120 of the loading disc 100 and the two clamping pieces 400 respectively. Thus, the test piece can be fixed to the loading disc by means of punching holes in the test piece 300 can be avoided.

[0091] Figure 3 A front view of the first loading disc half 101 of the loading disc 100 is shown schematically. Figure 4 A perspective view of the clamping piece 400 is shown schematically. In conjunction with Figures 2 to 4 The clamping of the test piece 300 by the loading disc 100, the clamping piece 400 is described.

[0092] The clamping piece 400 has a thickness-reduced portion 410 which, when clamping the test piece 300, at least partially covers one of the ends of the test piece 300 in the tensile direction, and the sum of the thickness of the thickness-reduced portion 410 and the thickness of the test piece 300 is at least not smaller than the thickness of the clamping piece 400 at the remaining positions of the clamping piece 400 other than the thickness-reduced portion 410.

[0093] The clamping piece 400 has a clamping piece fastener hole 401 at the remaining positions of the clamping piece 400 other than the thickness-reduced portion 410, and the recess 120 of the loading disc 100 has a corresponding recess fastener hole 121, allowing the fastener assembly 500 to pass through the clamping piece fastener hole 401 and the recess fastener hole 121 to fix the clamping piece 400 to the recess 120 of the loading disc 100, and thus the clamping piece 400 and the loading disc 100 clamp the ends of the test piece 300 in the tensile direction.

[0094] Preferably, the dimensions of the test piece 300, the clamping piece 400 and the recess 120 of the loading disc 100 are matched with each other, so that the sum of the thickness of the recess 120 of the loading disc 100 and the thickness of the clamping piece 400 at the fastener assembly 500 fixing position is consistent with the thickness of the loading disc 100, and the center of the thickness of the test piece 300 is collinear with the force transmission line.

[0095] The fastener assembly 500 can be, but is not limited to, a bolt-nut assembly, which clamps the clamping piece 400 on the loading disc 100 by means of a bolt, which is used to adjust the clamping degree. The tensile force exerted by the tensile arm of the testing machine is transmitted to the loading disc 100 through the wedge-shaped clamp 200, and then to the test piece 300 through the clamping of the test piece 300 by the clamping piece 400 and the loading disc 100 fixed by the bolt.

[0096] Figures 5-7A clamped test piece 300 is shown schematically according to an embodiment of the present application. Figure 5 is a side view of the clamped test piece 300, and Figure 6 , Figure 7 is a front view of the test piece 300. The overhang distance h of the test piece 300 is 10.2 mm according to the ASTM D6484 Standard Test Method for Open Hole Compressive Strength of Polymer Matrix Composite Laminates. In addition, the outer shape of the test piece 300 is designed according to An Evaluation of the Arcan Specimen for Determining the Shear Moduli of Fiber-reinforced Composites. As shown in Figure 6 , the V-notch angle of the test piece 300 is preferably a rounded 90-degree angle shape. As shown in Figure 7 , the test piece 300 is designed with a length L of 16.1 mm at the minimum length of the test piece, an exposed tensile distance h of 10.2 mm after clamping of the test piece, and a rounded radius R of 2.4 mm.

[0097] Figure 8 A front view of the loading disc 100 is shown schematically during the test, where θ is the magnitude of the angle between the test piece 300 and the tensile force direction of the tensile testing machine. At the V-notch of the test piece, the direction of the loading disc 100 and the loading ratio, i.e. the ratio of tensile stress σ to shear stress τ, is related to θ as follows:

[0098]

[0099]

[0100]

[0101] where A is the cross-sectional area of the V-notch of the test piece, and F is the vertical applied load.

[0102] The installation steps of the test assembly 1 according to the present application will be described below.

[0103] 1. Assemble the test piece 300, the loading disc 100, and the clamping piece 400 together, and apply a pre-tightening force to the clamping piece 400 by the fastener assembly 400, so that the loading disc 100 and the clamping piece 400 clamp the test piece 300.

[0104] 2. Insert the four wedge-shaped clamp halves of the clamp 200 into the wedge-shaped receiving spaces of the interface portions of the upper and lower tensile arms of the testing machine.

[0105] 3. Place the edge 110 of the assembled loading disk 100 into the lower clamp 200 (200b), and adjust the clamping degree of the clamp 200 to the point that it can slightly clamp the loading disk 100, while still allowing the loading disk 100 to rotate.

[0106] 4. Adjust the orientation of the loading disk 100 by rotating it according to the required orientation and loading ratio.

[0107] 5. Operate the lower clamp 200 (200b) to clamp the loading disk, ensuring the loading disk is in the correct orientation at this time.

[0108] 6. Use the upper clamp 200 (200a) to clamp the loading disk, and then the corresponding tensile and shear test can begin.

[0109] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention have been clearly and completely described above in conjunction with the specific embodiments and accompanying drawings.

[0110] It should be understood that the steps shown above in conjunction with specific embodiments are illustrative. Those skilled in the art can add or delete corresponding steps, adjust the execution order of one or more steps, or replace one or more steps with similar steps.

[0111] Although various embodiments have been described above, it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of them, and are presented by way of example rather than limitation. It will be apparent to those skilled in the art that the disclosed subject matter may be implemented in other specific forms without departing from its spirit and essential characteristics.

[0112] In this process, various elements important to the present invention or elements conducive to further development of the present invention will be mentioned in the specific examples. However, some of these elements may also be used to further develop the present invention when departing from the content and other features of the corresponding examples. Therefore, the embodiments described above are considered exemplary in all respects and not restrictive, and are not intended to limit the present invention in any way.

[0113] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. This disclosure also includes various modifications and equivalent variations. In addition, various combinations and methods, further including only one element, one or more or less other combinations and methods, also fall within the scope and concept of this disclosure.

Claims

1. A test assembly for material tensile shear property test, for a tensile testing machine, the test assembly (1) comprising: a loading disc (100); and a clamp (200) comprising an upper end clamp (200a) and a lower end clamp (200b) clamping an edge portion (110) of the loading disc (100) from above and below respectively through respective clamping grooves (210), the clamping grooves (210) of the clamp (200) being shaped to fit the edge portion (110) of the loading disc (100) such that when the clamp (200) is clamped, the clamping grooves (210) are prevented from moving relative to the edge portion (110) and when the clamp (200) is released, the edge portion (110) is allowed to slide along the clamping grooves (210) and the loading disc (100) is allowed to rotate, wherein the clamp (200) comprises a first clamp half (201) and a second clamp half (202), wherein the first clamp half (201) and the second clamp half (202) comprise respective first clamping groove half (211) and second clamping groove half (212) fitting to form the clamping grooves (210), the first clamping groove half (211) and the second clamping groove half (212) abutting against the edge portion (110) from two sides of the loading disc (100), wherein the clamp (200) comprises an interface groove (220) shaped to fit a joint in an interface portion of a tensile arm of the testing machine, and the first clamp half (201) and the second clamp half (202) comprise respective first interface groove half (221) and second interface groove half (222) fitting to form the interface groove (220), the first interface groove half (221) and the second interface groove half (222) abutting against the joint from two sides of the joint, wherein the clamp (200) is wedge-shaped shaped to fit the interface portion of the testing machine.

2. The test assembly according to claim 1, wherein the edge portion (110) of the loading disc (100) comprises a raised portion (111) shaped to fit the clamping grooves (210) and protruding towards two sides of the loading disc (100).

3. The test assembly according to claim 1, wherein the edge portion (110) of the loading disc (100) comprises a plurality of angle guide lines (112) arranged at intervals in a circumferential direction of the loading disc (100), and the angle guide lines (112) are at intervals of 2 degrees, 5 degrees and / or 10 degrees in the circumferential direction.

4. The test assembly according to claim 3, wherein the angle guide lines (112) are engraved intaglio, embossed, or colored material.

5. The test assembly according to claim 1, wherein The loading disc (100) comprises a first loading disc half (101) and a second loading disc half (102), the first loading disc half (101) and the second loading disc half (102) respectively comprise respective recesses (120) for fixing a test piece (300) in a middle region, and The test assembly further comprises clamping pieces (400), two ends of the test piece (300) in a stretching direction are respectively clamped between the two recesses (120) of the loading disc (100) and the two clamping pieces (400).

6. The test assembly according to claim 5, wherein, The clamping piece (400) has a thickness reduction part (410), the thickness reduction part (410) at least partially covers an end of the test piece (300) in a stretching direction, and a sum of a thickness of the thickness reduction part (410) and a thickness of the test piece (300) is at least not less than a thickness of the clamping piece (400) at a remaining position other than the thickness reduction part (410).

7. The test assembly according to claim 6, wherein, The clamping piece (400) has a clamping piece fastener hole (401) at a remaining position other than the thickness reduction part (410), and the recess (120) of the loading disc (100) has a corresponding recess fastener hole (121), and The test assembly further comprises a fastener assembly (500), the fastener assembly (500) clamps the clamping piece (400) and the test piece (300) to the loading disc (100) through the clamping piece fastener hole (401) and the recess fastener hole (121).

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