Material shear force detection device, detection method and shear sample thereof

Abstract

The application provides a material shear force detection device, a detection method and a shear sample thereof. The material shear force detection device comprises a base plate, a strip-shaped opening is arranged on the base plate in the longitudinal axis direction, and a first groove is symmetrically arranged on both sides of the strip-shaped opening; a sliding block has a strip-shaped end in the longitudinal axis direction, the strip-shaped end is matched with the strip-shaped opening, and a second groove is arranged on the strip-shaped end; two clamping jaws are fixedly arranged on the base plate; and a clamping bridge is fixed on the strip-shaped end of the sliding block, and the clamping bridge is matched with the second groove and used for clamping the middle part of the shear sample up and down. The material shear force detection device, the detection method and the shear sample thereof can determine the assembly quality of frameless windows, improve the readability and usability of shear force measurement data, and improve the accuracy of finite element simulation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical measurement, in particular to a material shear force detection device, a detection method and a shear sample thereof. BACKGROUND

[0002] In order to save the cost of real vehicle collision in the development process of automobile vehicles, a large number of finite element calculation resources need to be used for collision simulation verification and optimization in the early stage of vehicle development. In order to accurately simulate and predict the damage of the vehicle in the collision, the performance of the automobile parts material needs to be accurately calibrated in the finite element model. The shear strength of the material is an important performance evaluation index. The traditional material shear performance test is usually tested according to the Chinese aviation industry standard HB 6736-1993. The test standard specifies the test method for determining the shear strength of metal sheet. The existing test method has the following problems: in order to enable the material to effectively fail under the action of shear force, the size of the standard sample defined by the standard sample results in that the actual gauge length is very small. Figure 1 The structure diagram of the standard sample in the prior art is shown. As shown in the figure, the shear force action distance h of the center area of the standard sample 101 is only about 2mm. The data measured in this area cannot be used for calibration in finite element simulation. The readability and usability of the data are very poor. If the gauge length is expanded, the sample cannot fail under the action of shear force, or is affected by tension, and the shear performance cannot be obtained through the test.

[0003] Therefore, in order to improve the shear strength performance test of the material, improve the readability and usability of the data, effectively use the shear strength of the material in the finite element model for material performance calibration and prediction of structure weak points, and improve the accuracy of finite element simulation, it is necessary to design a new material test sample and detection method. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a material shear force detection device, a detection method and a shear sample thereof, which can improve the readability and usability of the shear force measurement data, thereby improving the accuracy of finite element simulation.

[0005] Specifically, the present application provides a material shear force detection device for measuring the height of a frameless front door and a frameless rear door assembled on a body-in-white, comprising:

[0006] A base plate is provided with a strip-shaped opening in the longitudinal direction thereof, and a first groove is symmetrically formed on both sides of the strip-shaped opening;

[0007] The slider has a strip-shaped end in the longitudinal direction of the slider, the strip-shaped end is adapted to the strip-shaped opening, a second groove is formed on the strip-shaped end, and the second groove cooperates with the first groove to form a mounting groove for accommodating a shear sample;

[0008] Two clamping jaws are fixedly arranged on the base plate and located on both sides of the strip-shaped opening, and the length direction of the clamping jaws is perpendicular to the longitudinal direction of the base plate, the clamping jaws are provided with a bayonet, and the bayonet cooperates with the first groove to clamp the end of the shear sample up and down;

[0009] A clamping bridge is fixed on the strip-shaped end of the slider, and the clamping bridge cooperates with the second groove to clamp the middle part of the shear sample up and down.

[0010] According to an embodiment of the present application, the material shear force detection device further comprises a bolt and a nut, the clamping jaw is provided with an oblong hole in the length direction of the clamping jaw, the base plate is provided with a first assembly hole, the nut is arranged at the bottom of the base plate, the bolt penetrates the oblong hole and the first assembly hole, and is threadedly fixed with the nut;

[0011] The clamping bridge is provided with a fixing hole, the strip-shaped end of the slider is provided with a second assembly hole, the nut is arranged at the bottom of the slider, and the bolt penetrates the fixing hole and the second assembly hole and is threadedly fixed with the nut.

[0012] According to an embodiment of the present application, the nut is fixed at the bottom of the base plate and the slider in a riveting manner.

[0013] According to an embodiment of the present application, the bottom of the clamping bridge is provided with a clamping block, and the clamping block cooperates with the second groove to clamp the middle part of the shear sample up and down.

[0014] According to an embodiment of the present application, the material shear force detection device further comprises an auxiliary handle, the clamping jaw is provided with a first positioning hole, the base plate is provided with a sliding groove, the length direction of the sliding groove is consistent with the length direction of the clamping jaw, and the bottom end of the auxiliary handle penetrates the first positioning hole and falls into the sliding groove, and the auxiliary handle is fixed with the sliding groove.

[0015] According to an embodiment of the present application, the material shear force detection device further comprises a mounting auxiliary device, a plurality of second positioning holes are formed on the base plate and the slider, and the mounting auxiliary device cooperates with the plurality of second positioning holes to align the second groove of the slider and the first groove of the base plate.

[0016] The present application also provides a shearing sample suitable for the material shearing force detection device, the shearing sample is matched with the mounting groove, the front and back surfaces of the shearing sample are provided with two double concave areas along the width direction, the mountain-shaped transition areas are formed at the two ends of the double concave areas, the inner shoulder parts are formed between the two double concave areas, and the outer shoulder parts are formed at the outer sides of the two double concave areas.

[0017] Part of the outer shoulder part is clamped between the clamping jaw and the base plate, and part of the inner shoulder part is clamped between the clamping bridge and the sliding block.

[0018] According to one embodiment of the present application, the width Wt of the shearing sample ranges from 15 to 30 mm, the length lt ranges from 45 to 70 mm, the thickness tt is the original processing thickness of the sample to be tested, the length l1 of the outer shoulder part ranges from 6 to 10 mm, the length l2 of the inner shoulder part ranges from 15 to 22 mm, the concave radius Rr1 of the double concave area ranges from 1.5 to 3.1 mm, and the concave thickness t is less than 0.65 mm.

[0019] The thickness tt and the concave thickness t of the shearing sample satisfy the following relationship: t = 0.5tt.

[0020] The present application also provides a material shearing force detection method suitable for the material shearing force detection device, which comprises the following steps:

[0021] S1, setting the ambient temperature as a constant temperature, and resetting the force measuring system of the tensile and compressive material testing machine to zero;

[0022] S2, inserting the strip-shaped end of the sliding block into the strip-shaped opening of the base plate, matching the second groove with the first groove to form a mounting groove, and placing the shearing sample into the mounting groove;

[0023] S3, fixing the two clamping jaws to the base plate, matching the bayonet with the first groove to clamp the ends of the shearing sample up and down, and fixing the clamping bridge to the strip-shaped end of the sliding block, matching the clamping bridge with the second groove to clamp the middle part of the shearing sample up and down;

[0024] S4, fixing the base plate and the sliding block to the tensile and compressive material testing machine;

[0025] S5, the tensile and compressive material testing machine pulls the sliding block along the longitudinal axis direction of the sliding block at a constant tensile speed, and a digital image measuring device is used to measure the displacement area of the shearing sample.

[0026] According to one embodiment of the present application, the sheared sample has double concave regions, in step S2, the gap between the clamping jaw and the clamping bridge has the double concave regions located in the gap, in step S4, the double concave regions of the sheared sample are measured by the digital image measuring device.

[0027] The present application provides a material shear force detection device, a detection method and a sheared sample, which can expand the gauge length section, thereby improving the readability and usability of the shear force measurement data, and improving the accuracy of finite element simulation.

[0028] It should be understood that the above general description and the following detailed description of the application are exemplary and illustrative, and are intended to provide further explanation of the application as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application, illustrate embodiments of the application, and together with the description serve to explain the principles of the application.

[0030] In the drawings:

[0031] Figure 1 A structural schematic diagram of a standard sample in the prior art is shown.

[0032] Figure 2 A structural schematic diagram of a material shear force detection device according to one embodiment of the present application is shown.

[0033] Figure 3 is a structural schematic diagram of the base plate and the slider in cooperation. Figure 2

[0034] Figure 4 is a structural schematic diagram of the base plate. Figure 2

[0035] Figure 5 is a structural schematic diagram of the clamping jaw. Figure 1

[0036] Figure 6 is a structural schematic diagram of the clamping bridge. Figure 1

[0037] Figure 7 is a sectional view of Figure 1 . Figure 1

[0038] Figure 8 is a sectional view of Figure 1 . Figure 2

[0039] Figure 9A ​​​​​​A structural schematic diagram of a shear sample of one embodiment of the present application is shown.

[0040] Figure 9B is a bottom view of Figure 9A

[0041] Figure 10 A structural schematic diagram of a non-metal material shear sample processing mold is shown.

[0042] Figure 11 A flow chart of a material shear force detection method of one embodiment of the present application is shown.

[0043] Among the above drawings, the following reference signs are included:

[0044] Standard sample 101

[0045] Material shear force detection device 200

[0046] Base plate 201

[0047] Slide 202

[0048] Clamping jaw 203

[0049] Clamping bridge 204

[0050] Bar-shaped opening 205

[0051] First groove 206

[0052] Bar-shaped end 207

[0053] Second groove 208

[0054] Bayonet 209

[0055] Bolt 210

[0056] Nut 211

[0057] Long waist hole 212

[0058] First assembly hole 213

[0059] Fixing hole 214

[0060] Second assembly hole 215

[0061] Clamping block 216

[0062] Auxiliary handle 217

[0063] First positioning hole 218

[0064] Slide groove 219

[0065] Ball 220 ​

[0066] Fine groove 221

[0067] Mounting aid 222

[0068] Second positioning hole 223

[0069] First positioning device 224

[0070] Second positioning device 225

[0071] Sheared sample 800

[0072] Double concave region 801

[0073] Mountain-shaped transition region 802

[0074] Inner shoulder 803

[0075] Outer shoulder 804

[0076] Processing die 900

[0077] Groove plate 901

[0078] Double-sided groove 902 DETAILED DESCRIPTION

[0079] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0080] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0081] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combination thereof.

[0082] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0083] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0084] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0085] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0086] Figure 2 A schematic diagram of a material shear force detection device according to an embodiment of the present invention is shown. Figure 3 yes Figure 2 A schematic diagram of the structure of the middle substrate and the slider. Figure 4 yes Figure 2 A schematic diagram of the structure of the middle substrate. Figure 5 yes Figure 1 A schematic diagram of the middle gripper structure. Figure 6 yes Figure 1 A schematic diagram of the structure of the clamping bridge. Figure 7 yes Figure 1 Cross-section Figure 1 . Figure 8 yes Figure 1 Cross-section Figure 2 As shown in the figure, the present invention provides a material shear force detection device 200, which mainly includes a base plate 201, a slider 202, two grippers 203 and a clamping bridge 204.

[0087] Among them, reference Figure 4 The substrate 201 has a strip-shaped opening 205 in its longitudinal direction. The substrate 201 has first grooves 206 symmetrically formed on both sides of the strip-shaped opening 205.

[0088] refer to Figure 3 The slider 202 has a strip-shaped end 207 in its longitudinal direction, which is adapted to the strip-shaped opening 205. The substrate 201 is aligned with the longitudinal direction of the slider 202. A second groove 208 is formed on the strip-shaped end 207, which cooperates with the first groove 206 to form a mounting groove for accommodating a sheared sample.

[0089] Two grippers 203 are fixedly mounted on the substrate 201 and located on both sides of the elongated opening 205 of the substrate 201. The length direction of the grippers 203 is perpendicular to the longitudinal axis of the substrate 201. (Reference) Figure 5 and Figure 8 The gripper 203 is provided with a slot 209, which cooperates with the first groove 206 to clamp the end of the sheared sample from the top and bottom.

[0090] Referring to Figure 2 and Figure 3 , the clamping bridge 204 is fixed on the strip-shaped end 207 of the slider 202, and the length direction of the clamping bridge 204 is consistent with the longitudinal axis direction of the slider 202. The clamping bridge 204 cooperates with the second groove 208 to clamp the middle part of the shear sample up and down.

[0091] Preferably, the material shear force detection device 200 further comprises a bolt 210 and a nut 211. Referring to Figure 2 , Figure 4 , Figure 7 and Figure 8 , the clamping jaw 203 is provided with an oblong hole 212 along the length direction thereof. The first assembly hole 213 is provided on the base plate 201. The nut 211 is arranged at the bottom of the base plate 201. The bolt 210 penetrates the oblong hole 212 and the first assembly hole 213, and is threadedly fixed with the nut 211. Referring to Figure 2 , Figure 6 and Figure 8 , the fixing hole 214 is provided on the clamping bridge 204, and the second assembly hole 215 is provided on the strip-shaped end 207 of the slider 202. The nut 211 is arranged at the bottom of the slider 202, and the bolt 210 penetrates the fixing hole 214 and the second assembly hole 215, and is threadedly fixed with the nut 211. Specifically, the clamping bridge 204 is bridged on the mounting groove, and is used to clamp the shear sample arranged in the mounting groove. More preferably, the nut 211 is fixed at the bottom of the base plate 201 and the slider 202 in a riveting manner. Some of the nuts 211 are aligned with the first assembly hole 213 of the base plate 201, and some of the nuts 211 are aligned with the second assembly hole 215 of the slider 202, which is beneficial to the assembly and fixation of the clamping jaw 203 and the clamping bridge 204 through the bolt 210.

[0092] Preferably, referring to Figure 6 , the clamping bridge 204 is provided with a clamping block 216 at the bottom thereof. The clamping block 216 cooperates with the second groove 208 to clamp the middle part of the shear sample 800 up and down.

[0093] Preferably, the material shear force detection device 200 further comprises an auxiliary handle 217. Referring to Figure 2 , Figure 5 , Figure 7 and Figure 8The first positioning hole 218 is formed on the clamping jaw 203. The slide groove 219 is formed on the base plate 201, and the length direction of the slide groove 219 is consistent with the length direction of the clamping jaw 203, and the slide groove 219 is matched with the first positioning hole 218. The bottom end of the auxiliary handle 217 penetrates the first positioning hole 218 and falls into the slide groove 219, and is matched and fixed with the slide groove 219. It is easy to understand that the auxiliary handle 217 and the bolt 210 are used for fixing the clamping jaw 203. Through the design of the long waist hole 212 and the slide groove 219, the clamping jaw 203 can be slightly moved along the length direction of the slide groove 219 when the clamping jaw 203 is not fixed, and the assembly of the bolt 210 and the auxiliary handle 217 is not affected. The position of the bayonet 209 arranged at the bottom of one end of the clamping jaw 203 is adjusted through the slight movement of the clamping jaw 203, so that the bayonet 209 is matched with the first groove 206, and the effective clamping of the end of the shearing sample is improved. More preferably, a ball 220 is formed at the top of the auxiliary handle 217, and a plurality of fine grooves 221 are formed on the surface of the ball 220 in the longitudinal direction. The plurality of fine grooves 221 are the operation contact parts of the auxiliary handle 217, and the plurality of fine grooves 221 can increase the friction, provide effective tightening force, and make the bottom end of the auxiliary handle 217 tightly matched with the slide groove 219.

[0094] Preferably, the material shearing force detection device 200 further comprises a mounting auxiliary device 222. Referring to Figure 2 and Figure 3 A plurality of second positioning holes 223 are formed on the base plate 201 and the slide block 202. The mounting auxiliary device 222 is matched and fixed with the plurality of second positioning holes 223, so that the second groove 208 of the slide block 202 and the first groove 206 of the base plate 201 are aligned, and the two form a mounting groove. In the assembly process of the detection device, the longitudinal axes of the base plate 201 and the slide block 202 are aligned through the mounting auxiliary device 222, and the second groove 208 and the first groove 206 of the base plate 201 are aligned. After the assembly of the detection device is completed, that is, after the fixed assembly of the clamping jaw 203 and the clamping bridge 204 is completed, the mounting auxiliary device 222 is removed.

[0095] Preferably, referring to Figure 2 The first positioning device 224 is arranged on the base plate 201, and the second positioning device 225 is arranged on the slide block 202. The base plate 201 and the slide block 202 are respectively fixed to the tensile and compressive material testing machine through the first positioning device 224 and the second positioning device 225.

[0096] The present application also provides a shearing sample suitable for the material shearing force detection device 200. The shearing sample is matched with the mounting groove, and is suitable for being arranged in the mounting groove formed by the first groove 206 and the second groove 208. Figure 9A The structure diagram of the shearing sample of one embodiment of the present application is shown. Figure 9B is Figure 9AThe figure shows a bottom view. As shown, the shear specimen 800 has two double-concave regions 801 along its width on both sides. A mountain-shaped transition region 802 is formed at both ends of the double-concave regions 801. The mountain-shaped transition regions 802 are symmetrically arranged along the axis of the double-concave regions 801, and their edges are formed by connecting arc segments with the same radius but different centers. (Reference) Figure 9A Along the length of the shear specimen 800, an inner shoulder 803 is formed between two double-recessed areas 801, and an outer shoulder 804 is formed on the outer side of the two double-recessed areas 801. During the assembly of the material shear force testing device 200, the jaws 209 of the gripper 203 engage with the first groove 206 of the base plate 201 to clamp a portion of the outer shoulder 804 of the shear specimen. The clamping block 216 of the clamping bridge 204 engages with the second groove 208 to clamp a portion of the inner shoulder 803. Specifically, the double-recessed areas 801 are the target locations for shear force testing of the shear specimen 800 and must not be obscured during the testing process. After the gripper 203 and the clamping bridge 204 fix the ends and middle of the shear specimen 800, a gap is left between the gripper 203 and the clamping bridge 204 to facilitate the testing of the double-recessed areas 801.

[0097] Preferably, the width Wt of the sheared specimen ranges from 15 to 30 mm, the length lt ranges from 45 to 70 mm, the thickness tt is the original machining thickness of the tested specimen, the length l1 of the outer shoulder 804 ranges from 6 to 10 mm, the length l2 of the inner shoulder 803 ranges from 15 to 22 mm, the radius of curvature Rr1 of the double concave region 801 ranges from 1.5 to 3.1 mm, and the concave thickness t < 0.65 mm;

[0098] The thickness tt of the sheared specimen and the indentation thickness t have the following relationship: t = 0.5tt.

[0099] More preferably, the edge of the mountain-shaped transition zone 802 is formed by connecting arc segments with radius Rr2, the radius of which ranges from 1.3 to 3.5 mm.

[0100] Figure 10A schematic diagram of a non-metal material shear specimen machining mold structure is shown. When performing a non-metal material test, the non-metal shear specimen must be machined by a slotter plate machine through injection molding. As shown in the figure, the machining mold 900 of the slotter plate machine includes two slot plates 901 with high unidirectionality, and two double-sided grooves 902 are opened in the slot plate 901. The double-sided groove 902 has a groove width of 1-3 mm. When performing a metal material test, the metal material shear specimen needs to be machined into a shear specimen that meets the requirements by a linear or laser cutting machine. Preferably, the upper and lower tolerances of the shear specimen machining are 0 and -0.05 mm, respectively. The arrow direction in the figure is the injection direction, and the dark area in the figure is the shape of the shear specimen 800. Linear or laser cutting is performed along the edge of the shape to obtain the shear specimen.

[0101] The present application also provides a material shear force detection method suitable for the material shear force detection device described above. Figure 11 A flow chart of a material shear force detection method of an embodiment of the present application is shown. As shown in the figure, the material shear force detection method includes the following steps:

[0102] S1, set the ambient temperature to a constant temperature, and reset the force measuring system of the tensile and compressive material testing machine to zero;

[0103] S2, insert the strip-shaped end portion 207 of the slider 202 into the strip-shaped opening 205 of the base plate 201, make the second groove 208 cooperate with the first groove 206 to form a mounting groove, and place the shear specimen 800 into the mounting groove;

[0104] S3, fix the two clamping jaws 203 to the base plate 201, and make the bayonet 209 of the clamping jaw 203 cooperate with the first groove 206 to clamp the end portion of the shear specimen up and down. Fix the clamping bridge 204 to the strip-shaped end portion 207 of the slider 202, and make the clamping bridge 204 cooperate with the second groove 208 to clamp the middle portion of the shear specimen 800 up and down;

[0105] S4, fix the base plate 201 and the slider 202 to the tensile and compressive material testing machine. The first positioning device 224 is arranged on the base plate 201, and the second positioning device 225 is arranged on the slider 202. The base plate 201 and the slider 202 are fixed to the tensile and compressive material testing machine through the first positioning device 224 and the second positioning device 225, respectively.

[0106] S5, the tensile and compressive material testing machine pulls the slider 202 along the longitudinal axis direction of the slider 202 at a constant tensile speed, and a digital image measuring device is used to measure the displacement area of the shear specimen 800.

[0107] Preferably, the shear specimen has a double concave region 801 as a gauge section for detecting the shear force. In step S2, the double concave region 801 is located in the gap between the clamping jaw 203 and the clamping bridge 204 after the assembly of the clamping jaw 203 and the clamping bridge 204. In step S4, the double concave region 801 of the shear specimen, i.e. the displacement area, is measured by the digital image measurement device. Referring to Figure 9A , the area marked by the dashed box is the measurement area of the digital image measurement device.

[0108] Preferably, in step S1, the ambient temperature is set to a constant temperature, and the temperature range is 20-26°C, preferably 23°C.

[0109] Preferably, the material shear force detection device 200 further comprises a mounting auxiliary device 222. Referring to Figure 2 and Figure 3 A plurality of second positioning holes 223 are formed on the base plate 201 and the sliding block 202. The mounting auxiliary device 222 is fixed in cooperation with the plurality of second positioning holes 223 to align the second groove 208 of the sliding block 202 and the first groove 206 of the base plate 201, and the two form a mounting groove. Before step S2 is performed, the mounting auxiliary device 222 is used to align the longitudinal axes of the base plate 201 and the sliding block 202, and the second groove 208 and the first groove 206 of the base plate 201 are aligned. After step S4 is performed and before step S5 is performed, i.e. after ensuring that the longitudinal axes of the base plate 201 and the sliding block 202 are aligned with the longitudinal axis of the tensile and compressive material testing machine, the mounting auxiliary device 222 is removed.

[0110] Preferably, the material shear force detection device 200 further comprises a bolt 210 and a nut 211 for fixing the clamping jaw 203 and the clamping bridge 204 to the base plate 201 and the sliding block 202, respectively. In step S3, the torque wrench is used to tighten the bolt 210 to a tightening torque of 15-30 Nm, preferably a tightening torque of 20 Nm.

[0111] Preferably, in step S5, the constant tensile speed of the tensile and compressive material testing machine is 0.1-2 mm / s until a force drop of 0.9*Fmax is reached, wherein Fmax is the maximum tensile force reached during the detection. The constant tensile speed is preferably 0.1 mm / s or 1 mm / s.

[0112] The effective distance of the gauge length section of the conventional material shear force detection standard sample is 2-3mm, and the measured data cannot be used in finite element simulation for calibration work, and the data reading and usability are very poor. The material shear force detection device, detection method and shear sample provided by the application can increase the effective distance of the gauge length section to 15mm, compared with the conventional material shear performance test, the actual gauge length section is increased by 7-8 times on the basis of ensuring the shear performance, which not only significantly improves the data reading, but also enables the measured data to be effectively used in finite element simulation for calibration work, greatly improving the data usability.

[0113] It is obvious for those skilled in the art that various modifications and variations can be made to the above-mentioned exemplary embodiments of the application without departing from the spirit and scope of the application. Therefore, it is intended to cover the modifications and variations of the application falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A material shear force detection device applied to a shear sample, the detection device comprising: a base plate provided with a strip-shaped opening in the longitudinal direction thereof, the base plate being provided with a first groove symmetrically on both sides of the strip-shaped opening; a slider provided with a strip-shaped end portion in the longitudinal direction thereof, the strip-shaped end portion being adapted to the strip-shaped opening, a second groove being formed on the strip-shaped end portion, the second groove cooperating with the first groove to form a mounting groove for accommodating a shear sample; two clamping jaws fixedly arranged on the base plate and located on both sides of the strip-shaped opening, the length direction of the clamping jaws being perpendicular to the longitudinal direction of the base plate, the clamping jaws being provided with a bayonet, the bayonet cooperating with the first groove to clamp the end portion of the shear sample up and down; a clamping bridge fixedly arranged on the strip-shaped end portion of the slider, the clamping bridge cooperating with the second groove to clamp the middle portion of the shear sample up and down; the shear sample cooperating with the mounting groove, the shear sample being provided with two double concave regions in the width direction of the front and back surfaces thereof, a mountain-shaped transition region being formed at both ends of the double concave regions, an inner shoulder being formed between the two double concave regions, and an outer shoulder being formed on the outer side of the two double concave regions; a part of the outer shoulder being clamped between the clamping jaws and the base plate, and a part of the inner shoulder being clamped between the clamping bridge and the slider.

2. The material shear force detecting apparatus according to claim 1, wherein a bolt and a nut are further included, a long waist hole being formed in the length direction of the clamping jaws, a first assembly hole being formed in the base plate, the nut being arranged at the bottom of the base plate, the bolt being inserted into the long waist hole and the first assembly hole and being threadedly fixed with the nut; a fixing hole being formed in the clamping bridge, a second assembly hole being formed in the strip-shaped end portion of the slider, the nut being arranged at the bottom of the slider, the bolt being inserted into the fixing hole and the second assembly hole and being threadedly fixed with the nut.

3. The material shear force detecting apparatus according to claim 2, wherein the nut is fixed to the bottom of the base plate and the slider in a riveting manner.

4. The material shear force detecting apparatus according to claim 1, wherein a clamping block is arranged at the bottom of the clamping bridge, the clamping block cooperating with the second groove to clamp the middle portion of the shear sample up and down.

5. The material shear force detecting apparatus according to claim 2, wherein an auxiliary handle is further included, a first positioning hole being formed in the clamping jaws, a sliding groove being formed in the base plate, the length direction of the sliding groove being consistent with the length direction of the clamping jaws, the bottom end of the auxiliary handle being inserted into the first positioning hole and falling into the sliding groove, and the auxiliary handle being fixed with the sliding groove.

6. The material shear force detecting apparatus according to claim 1, wherein an installation auxiliary device is further included, a plurality of second positioning holes being formed in the base plate and the slider, the installation auxiliary device cooperating with the plurality of second positioning holes to align the second groove of the slider and the first groove of the base plate.

7. The material shear force detecting apparatus according to claim 1, wherein The width Wt of the sheared sample ranges from 15 to 30 mm, the length lt ranges from 45 to 70 mm, and the thickness t ranges from 0.5 to 1.5 mm t The original machining thickness of the tested sample is 0.5 to 1.5 mm, the length li of the outer shoulder ranges from 6 to 10 mm, the length 12 of the inner shoulder ranges from 15 to 22 mm, the concave radius Rrl of the double concave region ranges from 1.5 to 3.1 mm, and the concave thickness t < 0.65 mm; The thickness t of the sheared sample t and the recess thickness t are related by t = 0.5t t。 8.A material shear force detection method applied to the material shear force detection device of claim 1, the method comprising the steps of: S1, setting the ambient temperature to be constant, and resetting the force measuring system of the tensile and compressive material testing machine to zero; S2, inserting the strip-shaped end portion of the slider into the strip-shaped opening of the base plate, cooperating the second groove with the first groove to form a mounting groove, and placing a shear sample into the mounting groove. S3, fixing two clamps on the substrate, the bay is matched with the first groove for clamping the end of the shear sample, fixing a clamping bridge on the strip end of the slider, the clamping bridge is matched with the second groove for clamping the middle of the shear sample; S4, fixing the substrate and slider on the tensile and compressive material testing machine; S5, the tensile and compressive material testing machine pulls the slider along the longitudinal axis of the slider at a constant stretching speed, and a digital image measuring device is used to measure the displacement area of the shear sample.

9. The material shear force detecting method according to claim 8, wherein The shear sample has double concave areas, there is a gap between the clamps and the clamping bridge in step S2, the double concave areas are located in the gap, and the double concave areas of the shear sample are measured by a digital image measuring device in step S4.

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