A tension-shear composite loading test strength measurement fixture device and measurement method

Abstract

The present invention proposes a strength measurement fixture device and a measurement method for a tension-shear composite loading test, which belongs to the technical field of strength measurement. It includes a support structure, a lateral tension pressure sensor, a tangential tension pressure sensor, a left pressure plate, a right pressure plate, a connecting rod mechanism, a horizontal drive mechanism and a vertical drive mechanism. The side surface of the right pressure plate is connected to the horizontal drive mechanism through a horizontal long pull rod, and the top surface of the right pressure plate is connected to the vertical drive mechanism through a vertical long pull rod. The horizontal drive mechanism and the vertical drive mechanism are both connected to the support structure. The side surface of the right pressure plate is connected to the support structure through a connecting rod mechanism. The left pressure plate is arranged opposite to the right pressure plate. The side surface of the left pressure plate is connected to the support structure through a lateral tension pressure sensor, and the bottom surface of the left pressure plate is connected to the support structure through a tangential tension pressure sensor. It is mainly used for strength measurement of tension-shear composite loading tests.

Description

Technical Field

[0001] The invention belongs to the technical field of strength measurement, and in particular relates to a tension-shear composite loading test strength measurement fixture device and a measurement method. Background Art

[0002] The automobile body shell is a complex structural part. It is made of more than 100 kinds of thin sheet stamping parts connected by welding, riveting, mechanical connection and bonding. Since the material of the body stamping parts is mostly low-carbon steel with good welding performance, welding is the most widely used connection method in modern body manufacturing. At present, with the continuous development of lightweight technology, composite materials have gradually replaced traditional metal materials and are widely used in automobile bodies due to their low density and good mechanical properties. Therefore, composite bonding is also becoming an important connection form in the body manufacturing process. In the engineering structure of the automobile body, the load-bearing components are in a state of unidirectional tension, compression and shear composite stress, and the strength of this type of components under the state of tension and shear composite stress is an important research content in the mechanics of the body structure. For a long time, it has been very difficult to load this type of components with tension and shear composite. At present, it can be achieved by using a multi-channel coordinated loading system or a multi-axis testing machine and an auxiliary fixture, but due to the high price of the equipment and the difficulty of the test process, it is rarely used. Especially in modern car body manufacturing and design, it is necessary to study the strength of welding points of low-carbon steel plate load-bearing components and bonding points of composite materials under complex loads. There is an urgent need for corresponding equipment to test this load state in the experiment to analyze the strength of the material. Summary of the invention

[0003] In view of this, the present invention aims to provide a tension-shear composite loading test strength measurement fixture device and a measurement method to solve the problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a tension-shear composite loading test strength measurement fixture device, which includes a supporting structure, a lateral tension pressure sensor, a tangential tension pressure sensor, a left pressure plate, a right pressure plate, a connecting rod mechanism, a horizontal driving mechanism and a vertical driving mechanism. The side surface of the right pressure plate is connected to the horizontal driving mechanism through a horizontal long pull rod, and the top surface of the right pressure plate is connected to the vertical driving mechanism through a vertical long pull rod. The horizontal driving mechanism and the vertical driving mechanism are both connected to the supporting structure. The side surface of the right pressure plate is connected to the supporting structure through a connecting rod mechanism. The left pressure plate is arranged opposite to the right pressure plate. The side surface of the left pressure plate is connected to the supporting structure through the lateral tension pressure sensor, and the bottom surface of the left pressure plate is connected to the supporting structure through the tangential tension pressure sensor.

[0005] Furthermore, the supporting structure includes four long I-beams and two short I-beams, the long I-beams and the short I-beams are both vertically arranged, the short I-beams are connected to the long I-beams through support rods to form a frame structure, the left side of the frame structure is connected to the left support plate, the middle is connected to the middle support plate, the right side is connected to the right support plate, the lower part is connected to the bottom support platform, and the upper part is connected to the top support platform, the lateral tensile pressure sensor is connected to the left support plate, the tangential tensile pressure sensor is connected to the bottom support platform, the vertical drive mechanism is adjacent to the top support platform, the horizontal drive mechanism is connected to the right support plate, and the horizontal long pull rod passes through the middle support plate.

[0006] Furthermore, the horizontal driving mechanism is a horizontal plug-type cylinder, and the vertical driving mechanism is a vertical plug-type cylinder.

[0007] Furthermore, the connecting rod mechanism is a parallelogram connecting rod mechanism, the number of the connecting rod mechanisms is two, the two connecting rod mechanisms are at the same height and are symmetrically arranged along the right pressure plate.

[0008] Furthermore, the number of the lateral pulling pressure sensors is three, and the three lateral pulling pressure sensors are evenly distributed along the circumferential direction of the left pressure plate, and the center of the cross section of the horizontal long pull rod is at the same center as the three lateral pulling pressure sensors.

[0009] Furthermore, there are two tangential pull pressure sensors, which are symmetrically arranged at the bottom of the left pressure plate. The center of the cross section of the vertical long pull rod is located on the symmetry line of the two tangential pull pressure sensors and is in the same plane with the two tangential pull pressure sensors.

[0010] Furthermore, the lateral tension pressure sensor and the tangential tension pressure sensor are both connected to the left pressure plate and the supporting structure through a force transmission rod.

[0011] Furthermore, both ends of the horizontal long pull rod are connected to the right pressure plate and the horizontal drive mechanism through a U-shaped hinge support, both ends of the vertical long pull rod are connected to the right pressure plate and the vertical drive mechanism through a U-shaped hinge support, both ends of the connecting rod mechanism are connected to the right pressure plate and the supporting structure through a U-shaped hinge support, and the force transmission rod is connected to the left pressure plate and the supporting structure through a U-shaped hinge support.

[0012] Furthermore, two circular specimen material plates are respectively fixed between the left pressure plate and the right pressure plate, the centers of the circular specimen material plates coincide with the centers of the left pressure plate and the right pressure plate, the projection of the cross-sectional center of the horizontal long pull rod in the YOZ coordinate plane coincides with the position of the center of the circular specimen material plates, and the projection of the cross-sectional center of the vertical long pull rod in the XOY coordinate plane coincides with the top center of the right pressure plate.

[0013] The present invention also provides a method for measuring the strength measurement fixture device of the tension-shear composite loading test.

[0014] The horizontal plug-type oil cylinder and the vertical plug-type oil cylinder are used to apply horizontal loading force and vertical loading force to the right pressure plate respectively, so as to realize coordinated and synchronous loading of tensile and shear loads on the test material plate, and the tensile and shear composite load is decomposed into horizontal loading force and vertical loading force through the transverse tensile pressure sensor and the tangential tensile pressure sensor;

[0015] The measured values ​​of the three transverse tension and pressure sensors are P X1 , P X2 , P X3 The test material plate is subjected to the lateral tensile load P X , then P X With P X1 , P X2 , P X3 The relationship is:

[0016] P X =P X1 +P X2 +P X3

[0017] The measured values ​​of the two tangential tension and pressure sensors are P Y1 , P Y2 The test material plate is subjected to the longitudinal shear load P Y , then P Y With P Y1 , P Y2 The relationship is:

[0018] P Y =P Y1 +P Y2

[0019] The test material plate is subjected to a transverse tensile load P X and the longitudinal shear load P Y , then the test material plate is subjected to a composite load P, then P and P X , P Y The relationship is:

[0020]

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has the characteristics of compact structure, convenient use, high reliability, low manufacturing cost, etc., can solve the technical problems of tension-shear composite loading in structural mechanics, and provides a simple and easy test method for studying structural strength. It is suitable for large-scale test pieces of welding points of body steel plates and bonding strength of composite materials, and can lay a theoretical foundation for further research and design of body structural parts. It can realize tension-shear composite loading tests of different proportions of test materials, and can also realize pure tensile and pure shear tests. The principle structure of the test device is clear, easy to use, low manufacturing cost, and reusable. It is very suitable for large-scale test pieces of automotive steel stamping materials, riveted materials, and new composite materials for structural stability and strength, and has high engineering application value.

[0022] The right pressure plate of the present invention is connected with two sets of symmetrical parallelogram linkage mechanisms of the same size through a hinge support, which effectively ensures the restriction of the freedom of the pressure plate during loading, so that the pressure plate only performs a small variable phase translation movement without deflection, thereby reducing test errors.

[0023] The horizontal long pull rod and the vertical long pull rod of the present invention are designed with a longer size, which effectively reduces the angle error of the pull rod deflection during loading and reduces the test error.

[0024] The left and right pressure plates of the present invention each have a circular through hole, and the radius of the circular through hole should be as large as possible, larger than the size of the head of the hexagon socket screw, to ensure that there is extra space between the head of the hexagon socket screw and the hole wall, to facilitate the installation and removal of the screw, to avoid interference during the loading process that affects the test results, and to reduce test errors.

[0025] Three tension and pressure sensors are fixed on the side of the left pressure plate of the present invention. The three sensors are evenly distributed on the same circle. The principle of three-point plane determination is applied. According to the measurement data of the three sensors, the exact position of the pressure plate side plane can be effectively detected to prevent the side deviation of the pressure plate from affecting the test results. Compared with the measurement of a single sensor, the measurement result is more accurate and effective.

[0026] The entire clamp device of the present invention has a simple structure, is easy to process, convenient to clamp, and easy to use, and can effectively measure the tensile-shear composite strength value of the test piece for reference in engineering design.

[0027] The tension-shear composite loading test strength measurement fixture device of the present invention has two square through holes in the bottom support platform, which is convenient for installing the tangential tension pressure sensor. The force transmission rod at the bottom of the tangential tension pressure sensor is connected to the square shaft sleeve rod fixed on the bottom support platform through a pin shaft, which effectively reduces the height of the two side support plates and improves the rigidity of the side support plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic structural diagram of a tension-shear composite loading test strength measurement fixture device according to the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the circular specimen material plate of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the left pressure plate of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the right pressure plate of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the left pressure plate, the right pressure plate and the circular specimen material plate according to the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the connecting rod mechanism of the present invention;

[0035] Figure 7 This is a schematic diagram of the connection structure of the lateral tension and pressure sensor of the present invention;

[0036] Figure 8 This is a schematic diagram of the connection structure of the tangential tension pressure sensor described in the present invention.

[0037] 1-long I-beam, 2-left support plate, 3-middle support plate, 4-right support plate, 5-force transmission rod, 6-lateral tension pressure sensor, 7-tangential tension pressure sensor, 8-bottom support platform, 9-left pressure plate, 10-right pressure plate, 11-connecting rod mechanism, 12-horizontal long pull rod, 13-vertical long pull rod, 14-top support platform, 15-support rod, 16-short I-beam, 17-horizontal plug cylinder, 18-vertical plug cylinder. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0039] See also Figure 1-8The present embodiment is described, which is a tension-shear composite loading test strength measurement fixture device, which includes a supporting structure, a lateral tension pressure sensor 6, a tangential tension pressure sensor 7, a left pressure plate 9, a right pressure plate 10, a connecting rod mechanism 11, a horizontal driving mechanism and a vertical driving mechanism. The side surface of the right pressure plate 10 is connected to the horizontal driving mechanism through a horizontal long pull rod 12, and the top surface of the right pressure plate 10 is connected to the vertical driving mechanism through a vertical long pull rod 13. The horizontal driving mechanism and the vertical driving mechanism are both connected to the supporting structure. The side surface of the right pressure plate 10 is connected to the supporting structure through a connecting rod mechanism 11. The left pressure plate 9 is arranged opposite to the right pressure plate 10. The side surface of the left pressure plate 9 is connected to the supporting structure through the lateral tension pressure sensor 6, and the bottom surface of the left pressure plate 9 is connected to the supporting structure through the tangential tension pressure sensor 7.

[0040] The supporting structure described in this embodiment includes four long I-beams 1 and two short I-beams 16, and the long I-beams 1 and the short I-beams 16 are both vertically arranged. The short I-beams 16 are connected to the long I-beams 1 through support rods 15 to form a frame structure. The left side of the frame structure is connected to the left support plate 2, the middle is connected to the middle support plate 3, the right side is connected to the right support plate 4, the lower part is connected to the bottom support platform 8, and the upper part is connected to the top support platform 14. The lateral tensile pressure sensor 6 is connected to the left support plate 2, the tangential tensile pressure sensor 7 is connected to the bottom support platform 8, the vertical drive mechanism is adjacent to the top support platform 14, the horizontal drive mechanism is connected to the right support plate 4, and the horizontal long pull rod 12 passes through the middle support plate 3.

[0041] In this embodiment, the horizontal driving mechanism is a horizontal plug-type oil cylinder 17 , and the vertical driving mechanism is a vertical plug-type oil cylinder 18 .

[0042] In this embodiment, the connecting rod mechanism 11 is a parallelogram connecting rod mechanism. There are two connecting rod mechanisms 11 . The two connecting rod mechanisms 11 are at the same height and are symmetrically arranged along the right pressure plate 10 .

[0043] In this embodiment, there are three lateral pulling pressure sensors 6 , which are evenly distributed along the circumference of the left pressure plate 9 , and the center of the cross section of the horizontal long pull rod 12 is at the same center as the three lateral pulling pressure sensors 6 .

[0044] In this embodiment, there are two tangential pull pressure sensors 7, which are symmetrically arranged at the bottom of the left pressure plate 9. The center of the cross section of the vertical long pull rod 13 is located on the symmetry line of the two tangential pull pressure sensors 7 and is in the same plane as the two tangential pull pressure sensors 7.

[0045] In this embodiment, the lateral tension pressure sensor 6 and the tangential tension pressure sensor 7 are both connected to the left pressure plate 9 and the supporting structure through the force transmission rod 5.

[0046] In this embodiment, both ends of the horizontal long pull rod 12 are connected to the right pressure plate 10 and the horizontal drive mechanism through a U-shaped hinge support, both ends of the vertical long pull rod 13 are connected to the right pressure plate 10 and the vertical drive mechanism through a U-shaped hinge support, both ends of the connecting rod mechanism 11 are connected to the right pressure plate 10 and the supporting structure through a U-shaped hinge support, and the force transmission rod 5 is connected to the left pressure plate 9 and the supporting structure through a U-shaped hinge support.

[0047] In this embodiment, two circular specimen material plates are respectively fixed between the left pressure plate 9 and the right pressure plate 10, and the centers of the circular specimen material plates coincide with the centers of the left pressure plate 9 and the right pressure plate 10. The projection of the cross-sectional center of the horizontal long pull rod 12 in the YOZ coordinate plane coincides with the center position of the circular specimen material plates. The projection of the cross-sectional center of the vertical long pull rod 13 in the XOY coordinate plane coincides with the top center of the right pressure plate 10.

[0048] The device has a simple and compact structure, is easy to use and clamp, has high reliability and low manufacturing cost. It can solve the technical problems of tension-shear composite loading in structural mechanics, and provides a simple and easy test method for studying structural strength. It is suitable for large-scale test pieces of welding points of car body steel plates and bonding strength of composite panels.

[0049] In this embodiment, the size of the left pressure plate 9 is: length × width × thickness = 300mm × 300mm × 25mm, and the size of the right pressure plate 10 is: length × width × thickness = 300mm × 300mm × 25mm. The top surface of the right pressure plate 10 is connected to the vertical long pull rod 13 with a U-shaped hinge support, and the outer thickness is 50mm.

[0050] like Figure 2-5As shown, two circular specimen material plates are fixed between the left pressure plate 9 and the right pressure plate 10, respectively. The radius of the circular specimen material plates is 140 mm, and the center position of the circle between the two circular specimen material plates is the strength measurement point required for the connection. The inner sides of the left pressure plate 9 and the right pressure plate 10 are respectively provided with threaded holes for fixing the circular specimen material plates. There are four threaded holes on each of the left pressure plate 9 and the right pressure plate 10, and the four threaded holes can form a circle. The four threaded holes are evenly distributed at 90 degrees on the circumference of the left pressure plate 9 and the right pressure plate 10. The radius of the circle formed by the threaded holes on the left pressure plate 9 and the right pressure plate 10 is the same, and the threaded holes on the two pressure plates are staggered at 45 degrees to ensure that when fixing the circular specimen material plates, the tightening hexagon socket screws on the two pressure plates do not affect each other. The center of the circular specimen material plate coincides with the center of the circle formed by the threaded holes, so that the tightening screws are evenly stressed when loaded. The number, position and size of the threaded holes on the two circular specimen material plates are the same as those on the two pressure plates, which is convenient for fastening screw installation. A circular through hole is opened on the circular specimen material plate and the pressure plate on the side of the hexagon socket screw head, which is concentric with the circular head of the hexagon socket screw. The radius of the circular through hole should be as large as possible to ensure that there is extra space between the hexagon socket screw head and the hole wall, which is convenient for loading and unloading and avoids interference during the loading process that affects the test results.

[0051] like Figure 1 As shown, the upper and bottom parts of the four long I-beams 1 are respectively welded with angle steels with a thickness of 20 mm, which is convenient for the limiting and fixing of the left support plate 2, the middle support plate 3, the bottom support platform 8 and the top support platform 14. A triangular reinforcing rib is welded at the bottom of the angle steel to improve the structural strength and rigidity. The length of the four long I-beams 1 is 1700 mm, which is convenient for installing the vertical long tie rod 13 and the vertical plug-type oil cylinder. The left support plate 2 and the middle support plate 3 are respectively fixed to the angle steel parts welded by the four long I-beams 1 and fixed with hexagon socket screws. The left support plate 2, the middle support plate 3 and the right support plate 4 are stress-bearing plates. In order to prevent stress deformation during loading and affect the measurement results, the outer sides of the left support plate 2, the middle support plate 3 and the right support plate 4 are all provided with strip reinforcing ribs. The length dimension should not be too large and the thickness should not be too small. The dimensions used in this embodiment are length × width × thickness = 500mm × 400mm × 30mm.

[0052] The threaded holes of the flanges on the horizontal plug-type oil cylinder 17 and the vertical plug-type oil cylinder 18 are matched with the threaded holes on the outside of the right support plate 4 and the top support platform 14, respectively. Each oil cylinder is fixed to the outside of the support plate with eight hexagon socket screws. According to the force principle, compared with fixing the flange to the inside of the support plate, the advantage is that the force of the hexagon socket screws can be reduced. The screws that fix the oil cylinder only play a fixed limit role and do not participate in the force during the loading process.

[0053] The horizontal plug-type oil cylinder 17 and the vertical plug-type oil cylinder 18 are respectively connected to the U-shaped hinge support on one side of the horizontal long tie rod 12 and the vertical long tie rod 13 through a pin shaft. The other side of the horizontal long tie rod 12 and the vertical long tie rod 13 are respectively connected to the U-shaped hinge support fixed on the side and top of the right pressure plate 10 to ensure that the connecting plane between the tie rod and the pressure plate is in a vertical state.

[0054] In order to effectively reduce the angle error of the rod deflection during loading and reduce the test error, the horizontal long rod 12 and the vertical long rod 13 need to be longer in size. The length size used in this embodiment is 600mm. The horizontal long rod 12 and the vertical long rod 13 only participate in the stretching effect, without the problem of compression rod stability, and the diameter of the circular cross-section size can be relatively reduced. The cross-section diameter size used in this embodiment is 25mm.

[0055] To facilitate the installation of the horizontal long tie rod 12 and the vertical long tie rod 13, circular through holes with diameters larger than the tie rod diameter are opened on the middle support plate 3, the right support plate 4 and the top support platform 14. In order to generate only horizontal tensile force and tangential shear force during loading, without generating bending moment, and not affecting the measurement of the lateral tension pressure sensor 6 and the tangential tension pressure sensor 7, the projection of the center of the circular cross section of the horizontal long tie rod 12 in the YOZ coordinate plane coincides with the center of the middle of the circular specimen material plate, that is, coincides with the measurement point of the test material plate's fixed strength. The projection of the center of the circular cross section of the vertical long tie rod 13 in the XOY coordinate plane coincides with the top center of the right pressure plate 10.

[0056] Three U-shaped hinge supports are fixed on the left side of the left pressure plate 9 with hexagon socket screws. The U-shaped hinge supports are connected to the force transmission rod 5 through a pin shaft. The length of the force transmission rod 5 should not be too large. The force transmission rod 5 is threadedly connected to the lateral tension pressure sensor 6, and the lateral tension pressure sensor 6 is connected to the U-shaped hinge support on the left support plate 2 through the force transmission rod 5.

[0057] In the horizontal direction, the three lateral pulling pressure sensors 6 are perpendicular to the planes of the left support plate 2 and the left pressure plate 9. The YOZ coordinate planes of the three lateral pulling pressure sensors 6 are on the same circumference on the left plane of the left pressure plate 9, and are evenly distributed at intervals of 120 degrees. The center of the cross section of the horizontal long pull rod 12 is concentric with the circle where the three lateral pulling pressure sensors 6 are located. Using the principle of three-point determination of the plane, the position of the pressure plate side plane can be determined according to the measurement data of the three lateral pulling pressure sensors 6, and it can be judged whether the pressure plate is deflected along the Z-axis and Y-axis directions.

[0058] The bottom of the left pressure plate 9 is connected to two tangential tension pressure sensors 7 in the vertical direction. The two tangential tension pressure sensors 7 are symmetrically distributed about the left pressure plate 9. The center of the cross section of the vertical long pull rod 13 is on the symmetry line and is in the same plane as the two tangential tension pressure sensors 7. According to the measurement data of the two tangential tension pressure sensors 7, the position of the bottom surface of the pressure plate can be determined to judge whether the pressure plate is deflected along the X-axis direction.

[0059] Two square through holes are provided on the bottom support platform 8, and the size of the square holes is larger than that of the tangential tension pressure sensor 7, so as to facilitate the installation of two tangential tension pressure sensors 7 at the bottom of the left pressure plate 9. Four square shaft sleeve rods are installed on the bottom support platform 8, which are respectively fixed to the bottom support platform 8 by two hexagonal nuts and washers, and the two hexagonal screws can prevent loosening. The force transmission rods 5 at the bottom of the two tangential tension pressure sensors 7 are connected to the four square shaft sleeve rods fixed on the bottom support platform 8 by pins. The connection method of the tangential tension pressure sensor 7 can effectively reduce the height of the two side support plates and improve the rigidity of the side support plates.

[0060] One side of the parallelogram linkage 11 is connected to the right pressure plate 10 through four U-shaped hinge supports, and the other side is fixed on the middle support plate 3. The two sets of parallelogram linkages 11 are at the same height with respect to the Z-axis direction and are symmetrically distributed with respect to the right pressure plate 10. The two sets of parallelogram linkages 11 are parallel to each other and perpendicular to the right pressure plate 10 and the middle support plate 3, ensuring that during the loading process, the pressure plate only makes a small variable phase horizontal movement without deflection under the freedom restriction of the parallelogram linkage 11.

[0061] The force transmission rod 5, the horizontal long pull rod 12 and the vertical long pull rod 13 are all connected to the U-shaped hinge support on the pressure plate by a pin shaft, and a slight deflection may occur during the loading process. This connection method will not cause the lateral tension pressure sensor 6 and the tangential tension pressure sensor 7 to interfere with each other during measurement, and will not affect the measurement results of the lateral tension pressure sensor 6 and the tangential tension pressure sensor 7.

[0062] This embodiment is a measurement method of a tension-shear composite loading test strength measurement fixture device.

[0063] The horizontal plug-type oil cylinder 17 and the vertical plug-type oil cylinder 18 are used to apply horizontal loading force and vertical loading force to the right pressure plate 10 respectively, so as to realize coordinated and synchronous loading of the tensile and shear loads on the test material plate. The left pressure plate 9 is connected to the transverse tensile pressure sensor 6 and the tangential tensile pressure sensor 7 through the force transmission rod 5 respectively, and the tensile and shear composite load is decomposed into horizontal loading force and vertical loading force through the transverse tensile pressure sensor 6 and the tangential tensile pressure sensor 7;

[0064] The measured values ​​of the three transverse tension pressure sensors 6 are P X1 , P X2 , PX3 The test material plate is subjected to the lateral tensile load P X , then P X With P X1 , P X2 , P X3 The relationship is:

[0065] P X =P X1 +P X2 +P X3

[0066] The measured values ​​of the two tangential tension pressure sensors 7 are P Y1 , P Y2 The test material plate is subjected to the longitudinal shear load P Y , then P Y With P Y1 , P Y2 The relationship is:

[0067] P Y =P Y1 +P Y2

[0068] The test material plate is subjected to a transverse tensile load P X and the longitudinal shear load P Y , then the test material plate is subjected to a composite load P. In the actual loading process, the angle θ between the horizontal long tie rod 12 and the vertical long tie rod 13 can be approximated to 90 degrees, and the error can be ignored. Then P and P X , P Y The relationship is:

[0069]

[0070] The device and the measuring method can be used to carry out tension-shear composite loading tests of different proportions on the test material, as well as pure tension and pure shear tests. The test device has a clear principle and structure, is easy to use, has low manufacturing cost, and is reusable. It is very suitable for testing large quantities of test pieces of automotive steel stamping materials, riveted materials, and new composite materials for structural stability and strength.

[0071] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A tension-shear composite loading test strength measurement fixture device, characterized in that: It comprises a supporting structure, a lateral tension pressure sensor (6), a tangential tension pressure sensor (7), a left pressure plate (9), a right pressure plate (10), a connecting rod mechanism (11), a horizontal driving mechanism and a vertical driving mechanism. The side surface of the right pressure plate (10) is connected to the horizontal driving mechanism via a horizontal long pull rod (12), the top surface of the right pressure plate (10) is connected to the vertical driving mechanism via a vertical long pull rod (13), the horizontal driving mechanism and the vertical driving mechanism are both connected to the supporting structure, the side surface of the right pressure plate (10) is connected to the supporting structure via a connecting rod mechanism (11), the left pressure plate (9) is arranged opposite to the right pressure plate (10), the side surface of the left pressure plate (9) is connected to the supporting structure via the lateral tension pressure sensor (6), and the bottom surface of the left pressure plate (9) is connected to the supporting structure via the tangential tension pressure sensor (11). The force sensor (7) is connected to the support structure. The connecting rod mechanism (11) is a parallelogram connecting rod mechanism. There are two connecting rod mechanisms (11). The two connecting rod mechanisms (11) are at the same height and are symmetrically arranged along the right pressure plate (10). Two circular specimen material plates are fixed between the left pressure plate (9) and the right pressure plate (10). The centers of the circular specimen material plates coincide with the centers of the left pressure plate (9) and the right pressure plate (10). The projection of the center of the cross section of the horizontal long pull rod (12) in the YOZ coordinate plane coincides with the center of the circular specimen material plate. The projection of the center of the cross section of the vertical long pull rod (13) in the XOY coordinate plane coincides with the top center of the right pressure plate (10). The center position between the two circular specimen material plates is the strength measurement point required for the connection.

2. A tension-shear composite loading test strength measurement fixture device according to claim 1, characterized in that: The support structure comprises four long I-beams (1) and two short I-beams (16), wherein the long I-beams (1) and the short I-beams (16) are both arranged vertically, and the short I-beams (16) are connected to the long I-beams (1) via support rods (15) to form a frame structure, wherein the left side of the frame structure is connected to a left support plate (2), the middle is connected to a middle support plate (3), the right side is connected to a right support plate (4), the lower part is connected to a bottom support platform (8), and the upper part is connected to a top support platform (14), the lateral tension pressure sensor (6) is connected to the left support plate (2), the tangential tension pressure sensor (7) is connected to the bottom support platform (8), the vertical drive mechanism is adjacent to the top support platform (14), the horizontal drive mechanism is connected to the right support plate (4), and the horizontal long pull rod (12) passes through the middle support plate (3).

3. A tension-shear composite loading test strength measurement fixture device according to claim 1, characterized in that: The horizontal driving mechanism is a horizontal plug-type oil cylinder (17), and the vertical driving mechanism is a vertical plug-type oil cylinder (18).

4. A tension-shear composite loading test strength measurement fixture device according to claim 1, characterized in that: The number of the lateral pulling pressure sensors (6) is three, and the three lateral pulling pressure sensors (6) are evenly distributed along the circumferential direction of the left pressure plate (9). The center of the cross section of the horizontal long pull rod (12) and the three lateral pulling pressure sensors (6) are at the same center.

5. The tension-shear composite loading test strength measurement fixture device according to claim 1, characterized in that: There are two tangential pulling pressure sensors (7), which are symmetrically arranged at the bottom of the left pressure plate (9). The center of the cross section of the vertical long pull rod (13) is located on the symmetry line of the two tangential pulling pressure sensors (7) and is in the same plane as the two tangential pulling pressure sensors (7).

6. A tension-shear composite loading test strength measurement fixture device according to any one of claims 1 to 5, characterized in that: The lateral pulling pressure sensor (6) and the tangential pulling pressure sensor (7) are both connected to the left pressure plate (9) and the supporting structure via a force transmission rod (5).

7. A tension-shear composite loading test strength measurement fixture device according to claim 6, characterized in that: Both ends of the horizontal long pull rod (12) are connected to the right pressure plate (10) and the horizontal drive mechanism through a U-shaped hinge support, both ends of the vertical long pull rod (13) are connected to the right pressure plate (10) and the vertical drive mechanism through a U-shaped hinge support, both ends of the connecting rod mechanism (11) are connected to the right pressure plate (10) and the supporting structure through a U-shaped hinge support, and the force transmission rod (5) is connected to the left pressure plate (9) and the supporting structure through a U-shaped hinge support.

8. A measuring method for the tension-shear composite loading test strength measuring fixture device according to claim 1, characterized in that: A horizontal plug-type oil cylinder (17) and a vertical plug-type oil cylinder (18) are used to apply a horizontal loading force and a vertical loading force to the right pressure plate (10) respectively, so as to realize coordinated and synchronous loading of the tensile and shear loads on the test material plate, and the tensile and shear composite loads are decomposed into a horizontal loading force and a vertical loading force by means of a transverse tensile pressure sensor (6) and a tangential tensile pressure sensor (7); The measured values ​​of the three transverse tension and pressure sensors (6) are P X1 , P X2 , P X3 The test material plate is subjected to the lateral tensile load P X , then P X With P X1 , P X2 , P X3 The relationship is: P X =P X1 +P X2 +P X3 The measured values ​​of the two tangential tension pressure sensors (7) are P Y1 , P Y2 The test material plate is subjected to the longitudinal shear load P Y , then P Y With P Y1 , P Y2 The relationship is: P Y =P Y1 +P Y2 The test material plate is subjected to a transverse tensile load P X and the longitudinal shear load P Y , then the test material plate is subjected to a composite load P, then P and P X , P Y The relationship is:

Images