A complex loading system for polyhedral materials

Abstract

The invention discloses a complex loading system for multi-cell materials, and the technical scheme mainly adopted is: a plurality of specimen clamping devices, on which a rectangular space structure for mounting and fixing the specimen and matching the specimen structure size is arranged, and the size of the rectangular space structure on each specimen clamping device is different and matches different specimen structure sizes; a loading condition angle adjustment device, which comprises an upper loading condition angle adjustment device and a lower loading condition angle adjustment device, the upper part of the specimen clamping device is embedded in the upper loading condition angle adjustment device and is detachably connected to the upper loading condition angle adjustment device, and the lower part of the specimen clamping device is embedded in the lower loading condition angle adjustment device; a stress monitoring device, which is embedded in the lower loading condition angle adjustment device and is detachably connected to the lower part of the specimen clamping device and the lower loading condition angle adjustment device respectively; and a data acquisition and analysis device, which is connected to the stress monitoring device.

Description

Technical Field

[0001] The invention relates to the technical field of mechanics research, and in particular to a complex loading system for polyhedral materials. Background Art

[0002] In the study of the mechanical properties of polyhedral materials, the mechanical behavior of material structures under complex stress states has become a major research hotspot. In order to better study the mechanical properties of materials, it is necessary to conduct relevant complex stress loading test verification. However, traditional testing devices such as universal testing machines can only perform unidirectional compression tests on materials, which cannot meet the needs of complex stress conditions; testing machines that can achieve complex loading, such as the planar biaxial testing system manufactured by MTS in the United States, are subject to high prices and are not universal. Therefore, a complex loading system based on a universal testing machine was born. The complex loading system needs to be able to apply stress in at least two directions to the material structure at the same time, namely, the normal stress perpendicular to the loading surface and the shear stress parallel to the loading surface. In order to adapt to more loading conditions, the complex loading system has a loading angle adjustment function to match more test requirements.

[0003] The complex loading system of the prior art glues the specimen to two pads with screw holes, connects the pads to the grooves in the middle of the two semicircles through bolts, opens a hole every 10° on the edge of the semicircular plate, and connects the upper and lower tooling claws connected to the testing machine through bolts to meet the test requirements at different angles. The test data is collected by sensors installed on the testing machine.

[0004] However, the complex loading system of the prior art has the following three shortcomings:

[0005] 1. The specimen and the device are connected by gluing, and the thickness of the glue layer needs to be controlled during the gluing process. If the glue layer is too thin, it may lead to loose gluing during the test, thus affecting the completion of the test; if the glue layer is too thick, it will affect the accuracy of the test results. At the same time, due to the inconsistent thickness of the upper and lower glue layers, the initial position of the specimen will not be in the center of the system, and the requirement of variable angle cannot be achieved, which is not conducive to the development of the test. 2. The data acquisition of the system is completed by the sensor on the test machine, and complex loading requires data in at least two directions. Therefore, certain requirements are put forward for the sensor of the test machine. When the sensor of the test machine cannot measure the data in two directions at the same time, the test data converted by multiplying the trigonometric function value of the angle will inevitably have a large error, which is not conducive to the research and verification. 3. The size of the middle groove of the system limits the size of the specimen. The system can only test specimens with a size not much different from the pad, and the universality of the specimen is low. Therefore, the complex loading system of the prior art cannot meet the needs of technicians in this field. Summary of the invention

[0006] In view of this, the present invention provides a complex loading system for polyhedral materials, the main purpose of which is to provide a complex loading system for polyhedral materials under various working conditions, which is independent of the sensor level on the universal testing machine and can complete multi-axis data acquisition work independently.

[0007] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0008] An embodiment of the present invention provides a complex loading system for multi-cell materials. The system comprises:

[0009] A plurality of specimen clamping devices, each of which is provided with a rectangular space structure for mounting and fixing the specimen and matching the structural dimensions of the specimen, wherein the dimensions of the rectangular space structure on each of the specimen clamping devices are different and match the structural dimensions of different specimens;

[0010] A loading condition angle adjustment device, comprising an upper loading condition angle adjustment device and a lower loading condition angle adjustment device, wherein the upper portion of the specimen clamping device is embedded in the upper loading condition angle adjustment device and is detachably connected to the upper loading condition angle adjustment device, and the lower portion of the specimen clamping device is embedded in the lower loading condition angle adjustment device; the upper loading condition angle adjustment device and the lower loading condition angle adjustment device have an angle adjustment range of -50° to -50° in the vertical direction;

[0011] A stress monitoring device, which is embedded in the lower loading condition angle adjustment device and is detachably connected to the lower part of the specimen clamping device and the lower loading condition angle adjustment device, respectively, and the stress monitoring device is located between the specimen clamping device and the lower loading condition angle adjustment device; the stress monitoring device is used to collect stress data of the specimen in the axial and tangential directions in real time and send the collected stress data to the data acquisition device;

[0012] A data acquisition and analysis device is connected to the stress monitoring device and is used to receive the stress data and perform test analysis on the stress data.

[0013] As mentioned above, the specimen clamping device comprises an upper pad having a first rectangular groove and a lower pad having a second rectangular groove, and the upper pad is butted with the lower pad so that the first rectangular groove and the second rectangular groove form a rectangular space structure matching the structural dimensions of the specimen;

[0014] The upper cushion block is embedded in the upper loading condition angle adjustment device and is detachably connected to the upper loading condition angle adjustment device;

[0015] The lower cushion block is embedded in the lower loading condition angle adjustment device and is detachably connected to the stress monitoring device.

[0016] As mentioned above, the size of the lower pad is consistent with the size of the upper portion of the stress monitoring device.

[0017] As mentioned above, the upper loading working condition angle adjustment device includes an upper semi-circular disc detachably connected to the upper pad and an upper claw detachably connected to the upper semi-circular disc at any angle between -50° and 50° in the vertical direction.

[0018] As mentioned above, the edge of the upper semi-disc is provided with a plurality of first through holes at intervals of 10°, and the upper claw is detachably connected to the upper semi-disc at any angle between -50° and 50° in the vertical direction through any three of the first through holes.

[0019] As mentioned above, the lower loading condition angle adjustment device includes a lower semi-circular disc detachably connected to the stress monitoring device and a lower claw detachably connected to the lower semi-circular disc at any angle between -50° and 50° in the vertical direction.

[0020] As mentioned above, the edge of the lower semi-disc is provided with a plurality of second through holes at intervals of 10°, and the lower claw is detachably connected to the lower semi-disc at any angle between -50° and 50° in the vertical direction through any three of the second through holes.

[0021] As mentioned above, the stress monitoring device is a three-axis force sensor.

[0022] As mentioned above, the data acquisition and analysis device includes a signal amplifier connected to the stress monitoring device, a data acquisition card connected to the signal amplifier, and a data acquisition and analysis module connected to the data acquisition card.

[0023] By means of the above technical solution, the complex loading system of multi-cell materials of the present invention has at least the following advantages:

[0024] The complex loading system for multi-cellular materials of the present invention is provided with a specimen clamping device and adopts a non-adhesive connection method, and there is no need to consider the influence of the thickness of the adhesive layer. During the installation of the specimen, it can ensure that the specimen is always in the central position of the system to achieve the requirement of variable angle, and by providing a stress monitoring device, the stress data of the specimen in the axial and tangential directions are collected in real time, and the multi-axis data collection work of the complex loading test can be effectively completed. The collection accuracy is high, and it is not restricted by the limitations of the sensors of the universal testing machine itself, and the multi-axis data collection work can be completed independently. In addition, by arranging the upper pad and the lower pad to dock, the first rectangular groove and the second rectangular groove form a rectangular space structure that matches the structural size of the specimen. For specimens of different sizes, the test can be completed by matching the upper pad and the lower pad with different groove sizes. The installation of the specimen is simpler and more effective, and has good universality.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the complex loading system of multicellular materials of the present invention;

[0027] Figure 2 The present invention is a schematic diagram of the installation structure of the specimen clamping device, the loading condition angle adjustment device and the stress monitoring device. Figure 1 ;

[0028] Figure 3 The present invention is a schematic diagram of the installation structure of the specimen clamping device, the loading condition angle adjustment device and the stress monitoring device. Figure 2 ;

[0029] Figure 4 It is a schematic cross-sectional view of the installation structure of the test piece clamping device, the loading condition angle adjustment device and the stress monitoring device of the present invention. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention application are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] like Figure 1 As shown, an embodiment of the present invention proposes a complex loading system for multi-cell materials, which includes: multiple specimen clamping devices 1, a loading condition angle adjustment device 2, a stress monitoring device 3 and a data acquisition and analysis device 4.

[0032] like Figures 1 to 4As shown, the specimen clamping device 1 is provided with a rectangular space structure for installing and fixing the specimen 5 and matching the structural dimensions of the specimen 5, and the dimensions of each rectangular space structure on the specimen clamping device 1 are different and match different structural dimensions of the specimen 5; specifically, the specimen clamping device 1 includes an upper pad 12 with a first rectangular groove 11 and a lower pad 14 with a second rectangular groove 13, and the upper pad 12 is docked with the lower pad 14 so that the first rectangular groove 11 and the second rectangular groove 13 form a rectangular space structure matching the structural dimensions of the specimen 5. The loading condition angle adjustment device 2 comprises an upper loading condition angle adjustment device 21 and a lower loading condition angle adjustment device 22. The upper part of the specimen clamping device 1 is embedded in the upper loading condition angle adjustment device 21 and is detachably connected to the upper loading condition angle adjustment device 21, and the lower part of the specimen clamping device 1 is embedded in the lower loading condition angle adjustment device 22. The angle adjustment range of the upper loading condition angle adjustment device 21 and the lower loading condition angle adjustment device 22 in the vertical direction is -50°-50°. Specifically, the upper pad 12 is embedded in the upper loading condition angle adjustment device 21 and is detachably connected to the upper loading condition angle adjustment device 21, and the lower pad 14 is embedded in the lower loading condition angle adjustment device 22 and is detachably connected to the stress monitoring device 3. The upper loading condition angle adjustment device 21 includes an upper semi-circular disk 211 detachably connected to the upper pad 12 and an upper claw 212 detachably connected to the upper semi-circular disk 211 at any angle between -50° and 50° in the vertical direction. In the present invention, the upper pad 12 is embedded in the lower semi-circular disk 221, and the edge of the disk of the upper semi-circular disk 211 is provided with a plurality of first through holes 2111 at intervals of every 10°. The upper claw 212 is detachably connected to the upper semi-circular disk 211 at any angle between -50° and 50° in the vertical direction through any three first through holes 2111. In the present invention, the upper pad 12 is threadedly connected to the upper semi-circular disk 211 through the upper pad bolt 121. The lower loading working condition angle adjustment device 22 includes a lower semi-disc 221 and a lower claw 222 that can be detachably connected to the lower semi-disc 221 at any angle between -50° and 50° in the vertical direction. The edge of the lower semi-disc 221 is provided with a plurality of second through holes 2211 at intervals of 10°. The lower claw 222 can be detachably connected to the lower semi-disc 221 at any angle between -50° and 50° in the vertical direction through any three of the second through holes 2211.The stress monitoring device 3 is embedded in the lower loading condition angle adjustment device 22 and is detachably connected to the lower part of the specimen clamping device 1 and the lower loading condition angle adjustment device 22, respectively. Specifically, the stress monitoring device 3 is embedded in the lower semi-circular disk 221 and is detachably connected to the lower semi-circular disk 221, and the lower pad 14 is embedded in the lower semi-circular disk 221 and is detachably connected to the stress monitoring device 3. The stress monitoring device 3 is used to collect stress data of the specimen 5 in the axial and tangential directions in real time and send the collected stress data to the data acquisition and analysis device 4; in the present invention, the stress monitoring device 3 is a three-axis force sensor, the size of the lower pad 14 is consistent with the size of the upper part of the three-axis force sensor, and the lower pad 14 and the three-axis force sensor are threadedly connected to the lower semi-circular disk 221 through the sensor fixing bolt 31 when the lower pad 14 and the three-axis force sensor are aligned. In the present invention, both the upper claw 212 and the lower claw 222 are provided with a claw plate 2121, the claw plate 2121 of the upper claw 212 is clamped on the upper semi-circular disk 211 and connected with any three first through holes 2111 through the claw plate connecting bolt 2122 so that the upper claw 212 is threadedly connected to the upper semi-circular disk 211, and the claw plate 2121 of the lower claw 222 is clamped on the lower semi-circular disk 221 and connected with any three second through holes 2211 through the claw plate connecting bolt 2122 so that the lower claw 222 is threadedly connected to the lower semi-circular disk 221. The data acquisition and analysis device 4 is connected to the stress monitoring device 3 and is used to receive the stress data and perform experimental analysis on the stress data. The data acquisition and analysis device 4 includes a signal amplifier 41 connected to the stress monitoring device 3, a data acquisition card 42 connected to the signal amplifier 41, and a data acquisition and analysis module 43 connected to the data acquisition card 42. The signal amplifier 41 is used to amplify the stress data collected by the stress monitoring device 3 and send it to the data acquisition card 42. The data acquisition card 42 is used to receive the stress data sent by the signal amplifier 41 and send the stress data to the data acquisition and analysis module 43. The data acquisition and analysis module 43 is used to perform experimental analysis and research on the collected stress data.

[0033] During the specific work, the position of the first through hole connecting the upper semi-circular disk and the upper claw and the position of the second through hole connecting the lower semi-circular disk and the lower claw are adjusted, the auxiliary loading condition angle required for the test is adjusted at an angle of -50°-50° in the vertical direction, the connection between the three-axis force sensor and the signal amplifier, the data acquisition card and the data acquisition and analysis module is completed, the specimen is fixed to the specimen clamping device, and the data acquisition device collects stress data of the specimen in the axial and tangential directions, so as to complete the experimental analysis and research on the complex loading conditions of polyhedral materials.

[0034] The complex loading system for multi-cellular materials in the embodiment of the present invention adopts a specimen clamping device and a non-adhesive connection method, and there is no need to consider the influence of the thickness of the glue layer. During the installation of the specimen, it can ensure that the specimen is always in the central position of the system to achieve the requirement of variable angle. By setting a stress monitoring device, stress data of the specimen in the axial and tangential directions are collected in real time, and the multi-axis data collection of the complex loading test can be effectively completed. The collection accuracy is high and is not restricted by the limitations of the sensors of the universal testing machine itself. The multi-axis data collection work can be completed independently. By setting the upper pad and the lower pad to dock, the first rectangular groove and the second rectangular groove form a rectangular space structure that matches the structural size of the specimen. For specimens of different sizes, the test can be completed by matching the upper pad and the lower pad with different groove sizes. The installation of the specimen is simpler and more effective, and has good universality.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A complex loading system for multi-cell materials, characterized by: It includes: A plurality of specimen clamping devices, each of which is provided with a rectangular space structure for mounting and fixing the specimen and matching the structural dimensions of the specimen, wherein the dimensions of the rectangular space structure on each of the specimen clamping devices are different and match the structural dimensions of different specimens; A loading condition angle adjustment device, comprising an upper loading condition angle adjustment device and a lower loading condition angle adjustment device, wherein the upper portion of the specimen clamping device is embedded in the upper loading condition angle adjustment device and is detachably connected to the upper loading condition angle adjustment device, and the lower portion of the specimen clamping device is embedded in the lower loading condition angle adjustment device; the upper loading condition angle adjustment device and the lower loading condition angle adjustment device have an angle adjustment range of -50° to -50° in the vertical direction; A stress monitoring device, which is embedded in the lower loading condition angle adjustment device and is detachably connected to the lower part of the specimen clamping device and the lower loading condition angle adjustment device respectively; the stress monitoring device is used to collect stress data of the specimen in the axial and tangential directions in real time and send the collected stress data to the data acquisition and analysis device; A data acquisition and analysis device is connected to the stress monitoring device and is used to receive the stress data and perform test analysis on the stress data.

2. The complex loading system of multiple materials according to claim 1, characterized in that: The specimen clamping device comprises an upper pad having a first rectangular groove and a lower pad having a second rectangular groove, wherein the upper pad is butted against the lower pad so that the first rectangular groove and the second rectangular groove form a rectangular space structure matching the structural dimensions of the specimen; The upper cushion block is embedded in the upper loading condition angle adjustment device and is detachably connected to the upper loading condition angle adjustment device; The lower cushion block is embedded in the lower loading condition angle adjustment device and is detachably connected to the stress monitoring device.

3. The complex loading system of multiple materials according to claim 2, characterized in that: The size of the lower pad is consistent with the size of the upper portion of the stress monitoring device.

4. The complex loading system of multiple materials according to claim 2, characterized in that: The upper loading working condition angle adjustment device includes an upper semi-circular disc detachably connected to the upper cushion block and an upper claw detachably connected to the upper semi-circular disc at any angle between -50° and 50° in the vertical direction.

5. The complex loading system of multiple materials according to claim 4, characterized in that: The edge of the upper semi-circular disk is provided with a plurality of first through holes at intervals of 10°, and the upper claw is detachably connected to the upper semi-circular disk at any angle between -50° and 50° in the vertical direction through any three of the first through holes.

6. The complex loading system of multiple materials according to claim 1, characterized in that: The lower loading condition angle adjustment device comprises a lower semi-circular disc detachably connected to the stress monitoring device and a lower claw detachably connected to the lower semi-circular disc at any angle between -50° and 50° in the vertical direction.

7. The complex loading system of multiple materials according to claim 6, characterized in that: The edge of the lower semi-circular disk is provided with a plurality of second through holes at intervals of 10°, and the lower claw is detachably connected to the lower semi-circular disk at any angle between -50° and 50° in the vertical direction through any three of the second through holes.

8. The complex loading system of multiple materials according to claim 1, characterized in that: The stress monitoring device is a three-axis force sensor.

9. The complex loading system of multiple materials according to claim 1, characterized in that: The data acquisition and analysis device comprises a signal amplifier connected to the stress monitoring device, a data acquisition card connected to the signal amplifier, and a data acquisition and analysis module connected to the data acquisition card.

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