Micromechanical property testing device and method

Abstract

The invention discloses a micromechanical property testing device and method, and the device comprises an electric micro-nano operating platform 1 which is connected with a clamping device 1, and an electric micro-nano operating platform 2 which is connected with a clamping device 2. The clamping devices are used for fixing the two ends of the sample to be tested respectively and can move to align and apply force. The method comprises the following steps: step 1, fixing two ends of a sample to be detected on a clamping device 1 and a clamping device 2 respectively; step 2, adjusting an operation table 1 and an operation table 2 to make the to-be-detected sample horizontal; and step 3, moving the operation table 1 and recording deformation of the clamping device until the sample is fractured. The device and the method can be used for in-situ measurement of the shear strength of a microcosmic sample.

Description

Technical Field

[0001] The invention belongs to the field of instrument science and technology, and specifically relates to a micromechanical property testing device and method. Background Art

[0002] Micromechanical characterization technology is an important technical means to characterize the micro-nanomechanical properties of materials, and is of great significance for studying the microstructure and properties of materials. Shear strength, as an important parameter in mechanical properties, helps to understand the basic structure and properties of materials, provides data support for establishing theoretical models of material behavior, and assists in improving material manufacturing processes and developing new materials.

[0003] The main steps of measuring the shear mechanical properties of materials include: preparation of the material to be tested, fixation of the material, application of shear force, and unloading of force. However, due to the small size of microscopic materials, the shear force applied is required to be extremely small, and the deformation process of the material must be observed under a microscope. Therefore, the traditional shear property measurement method is not applicable, and it is necessary to develop a method for observing and measuring microscopic shear force and deformation.

[0004] Currently, nanoindentation technology and atomic force microscopy are widely used in micromechanics measurements. However, these methods mainly focus on the elastic strength of materials and have not yet involved the shear properties of materials. How to design microscopic shear mechanics measurement devices and methods is still a difficult problem.

[0005] In view of the need for measuring the shear strength of microscopic materials, the present invention provides a method for measuring the shear mechanical properties of microscopic materials, which can fill the gap in existing research. Summary of the invention

[0006] In view of the above problems, the present invention proposes a micro-mechanical property testing device and method, which can realize the application and measurement of shear force at a micro scale, with high precision, strong adaptability and easy operation.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A micromechanical property testing device comprises an operating table 1, an operating table 2, a clamping device 1, a clamping device 2 and a clamping device 3. The sample to be tested is arranged between the operating table 1 and the operating table 2. A suitable clamping device is selected according to the stiffness of the sample to be tested. The suitable clamping device is the clamping device 2 or the clamping device 3. The two ends of the sample to be tested are fixed on the clamping device 1 and the corresponding suitable clamping device.

[0009] The operating table 1 includes a base 1, a motor 1 for X-direction movement, a motor 1 for Y-direction movement, a motor support module, a motor 1 for Z-direction movement, a connecting device fixing platform 1 and a connecting device 1, wherein the base 1 is fixedly connected to a lower end of the motor for X-direction movement by bolts, the motor 1 for X-direction movement is fixedly connected to a lower end of the motor for Y-direction movement by bolts, the motor 1 for Y-direction movement is fixedly connected to a lower end of the motor support module by bolts, the front end of the motor support module is fixedly connected to the motor 1 for Z-direction movement by bolts, the front end of the motor 1 for Z-direction movement is fixedly connected to a connecting device fixing platform 1 by bolts, the front end of the connecting device fixing platform 1 is fixedly connected to an upper end of a connecting device 1 by bolts, and the lower end of the connecting device is fixedly connected to a clamping device 1 by bonding;

[0010] The second operating platform includes a second connecting device, a second connecting device fixing platform, a second motor for Z-direction movement, a second motor for X-direction movement, a second motor for Y-direction movement and a second base. The upper end of the second base is fixedly connected to the second motor for Y-direction movement by bolts, the upper end of the second motor for Y-direction movement is fixedly connected to the second motor for X-direction movement by bolts, the upper end of the second motor for X-direction movement is fixedly connected to the second motor for Z-direction movement by bolts, the front end of the second motor for Z-direction movement is fixedly connected to the second connecting device fixing platform by bolts, the front end of the second connecting device fixing platform is fixedly connected to the upper end of the second connecting device by bolts, and the lower end of the second connecting device is fixedly connected to the second clamping device or the third clamping device by bonding.

[0011] As a further improvement of the present invention, the connecting device 1 and the connecting device 2 are Z-shaped.

[0012] As a further improvement of the present invention, the first clamping device is a glass tube, the second clamping device is a metal sheet, and the third clamping device is a glass sheet.

[0013] The present invention provides a working method of a micromechanical property testing device, and the specific steps are as follows:

[0014] 1) Select a suitable clamping device according to the stiffness of the sample to be tested, the suitable clamping device is clamping device 2 or clamping device 3, and fix the two ends of the sample to be tested on the two ends of clamping device 1 and the suitable clamping device;

[0015] 2) Move the sample to the center of the microscope field of view, and adjust the operating table 1 and the operating table 2 in real time according to the microscope imaging results so that the sample is in a horizontal position;

[0016] 3) Apply shear force to move the operating table 1 along the y direction, and use a microscope to observe and record the deformation of the clamping device and the sample to be tested until the sample to be tested breaks;

[0017] 4) When the sample breaks, the clamping device is used as an Euler-Bernoulli beam for theoretical calculation, and its deflection curve should satisfy:

[0018] w(x)=ax 3 +bx 2

[0019] Among them, a=P / 6EI, P is the applied force, E is Young's modulus, I is the moment of inertia, and b is a constant parameter. The deflection curve is fitted according to the above formula to obtain the values ​​of a and b. The values ​​of E and I can be obtained respectively according to the material and shape parameters of the clamping device. Then P=6aEI, that is, the shear force received by the sample when it breaks, and the shear strength value of the sample can be measured accordingly.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The present invention can achieve the initial level of the sample through the coordinated movement of the dual micro-nano operating tables, thereby ensuring the accuracy of force measurement.

[0022] 2) According to the mechanical properties of the material, different clamping devices and measuring devices can be selected, with a wide measuring range and high accuracy.

[0023] 3) The measuring device of the present invention has multiple degrees of freedom, a large stroke, and a large working space. By cooperating with a microscopic imaging device, it can realize automatic measurement of multiple degrees of freedom and can measure materials of various shapes such as strips, sheets, and columns. It has a wide range of applications and high precision, and is of great significance to scientific research in the fields of materials and bioengineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the device for measuring the shear strength of microscopic materials in the present invention;

[0025] Figure 2 It is a work flow chart for measuring the shear strength of microscopic materials in the present invention;

[0026] Figure 3 is a schematic diagram for shear strength measurement in the present invention;

[0027] Figure 4 It is a schematic diagram of deformation calculation of the clamping device of the present invention;

[0028] The component names are as follows:

[0029] 1. Base 1; 2. Motor 1 for X-direction movement; 3. Motor 1 for Y-direction movement; 4. Motor support module; 5. Motor 1 for Z-direction movement; 6. Connecting device fixing platform 1; 7. Connecting device 1; 8. Clamping device 1; 9. Clamping device 2; 10. Connecting device 2; 11. Connecting device fixing platform 2; 12. Motor 2 for Z-direction movement; 13. Motor 2 for X-direction movement; 14. Motor 2 for Y-direction movement; 15. Base 2; 16. Clamping device 3. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0031] The present invention includes a micromechanical property testing device. The device includes an electric micro-nano operation table 1, which can realize xyz three-axis movement. A clamping device is installed at the end of the operation table 1, which can realize the fixation of the sample to be tested. At the same time, the clamping device can apply shear force. The applied shear force can be calculated through the deformation of the clamping device, so as to calculate the shear strength; the electric micro-nano operation table 2, on which the clamping device 2 is connected, can realize the fixation of the other end of the sample to be tested. Through the coordinated movement of the operation table 1 and the operation table 2, the sample to be tested can be moved to the horizontal initial position and the shear force can be applied.

[0032] Shear strength measurement method, its workflow is as follows Figure 2 For shear strength measurements, see Figure 3 As shown, it includes: step 1, selecting a clamping device with suitable stiffness, and fixing the two ends of the sample to be tested on the clamping device 1 and the corresponding suitable clamping device respectively; step 2, adjusting the operating table 1 and the operating table 2 so that the sample to be tested is in a horizontal initial position; step 3, moving the operating table 1 and recording the deformation of the clamping device 1 until the sample breaks.

[0033] Embodiment 1:

[0034] like Figure 1 As shown, the present invention includes a device for measuring micro shear strength. First, fix the two ends of the sample to be tested at the two ends of the clamping device 1 and the clamping device 2. If the sample strength is relatively high, the clamping device 1 can be replaced by the clamping device 3. Then, move the sample to the center of the microscope field of view. According to the microscope imaging results, adjust the operating table 1 and the operating table 2 in real time so that the sample is in a horizontal position. Then, move the operating table 1 along the y direction, and use a microscope to observe and record the deformation of the clamping device and the sample to be tested until the sample to be tested breaks. When the sample breaks, the deformation of the clamping device 1 or the clamping device 3 is as shown in FIG. Figure 4 As shown. The clamping device is used as an Euler-Bernoulli beam for theoretical calculation, and its deflection curve should satisfy:

[0035] w(x)=ax 3+bx 2

[0036] Among them, a=P / 6EI, P is the applied force, E is Young's modulus, I is the moment of inertia, and b is a constant parameter. According to the above formula, the values ​​of a and b can be obtained by fitting the deflection curve. According to the material and shape parameters of the clamping device, the values ​​of E and I can be obtained respectively, then P=6aEI, which is the shear force received by the sample when it breaks. In this way, the shear strength value of the sample can be measured.

[0037] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A micromechanical property testing device, comprising an operating table 1, an operating table 2, a clamping device 1 (8), a clamping device 2 (9) and a clamping device 3 (16), characterized in that The sample to be tested is set between the operating table 1 and the operating table 2. A suitable clamping device is selected according to the stiffness of the sample to be tested. The suitable clamping device is the clamping device 2 (9) or the clamping device 3 (16). The two ends of the sample to be tested are fixed on the clamping device 1 and the corresponding suitable clamping device respectively. The operating table comprises a base (1), an X-direction movement motor (2), a Y-direction movement motor (3), a motor support module (4), a Z-direction movement motor (5), a connecting device fixing platform (6) and a connecting device (7), wherein the base (1) is fixedly connected to the lower end of the X-direction movement motor (2) by bolts, the X-direction movement motor (2) is fixedly connected to the lower end of the Y-direction movement motor (3) by bolts, the Y-direction movement motor (3) is fixedly connected to the lower end of the motor support module (4) by bolts, the front end of the motor support module (4) is fixedly connected to the Z-direction movement motor (5) by bolts, the front end of the Z-direction movement motor (5) is fixedly connected to the connecting device fixing platform (6) by bolts, the front end of the connecting device fixing platform (6) is fixedly connected to the upper end of the connecting device (7) by bolts, and the lower end of the connecting device (7) is fixedly connected to the clamping device (8) by bonding. The operating platform 2 comprises a connecting device 2 (10), a connecting device fixing platform 2 (11), a Z-direction moving motor 2 (12), an X-direction moving motor 2 (13), a Y-direction moving motor 2 (14) and a base 2 (15). The upper end of the base 2 (15) is fixedly connected to the Y-direction moving motor 2 (14) by bolts, the upper end of the Y-direction moving motor 2 (14) is fixedly connected to the X-direction moving motor 2 (13) by bolts, the upper end of the X-direction moving motor 2 (13) is fixedly connected to the Z-direction moving motor 2 (12) by bolts, the front end of the Z-direction moving motor 2 (12) is fixedly connected to the connecting device fixing platform 2 (11) by bolts, the front end of the connecting device fixing platform 2 (11) is fixedly connected to the upper end of the connecting device 2 (10) by bolts, and the lower end of the connecting device 2 (10) is fixedly connected to the clamping device 2 (9) or the clamping device 3 (16) by bonding.

2. The working method of the micromechanical property testing device according to claim 1, characterized in that: The connecting device 1 (7) and the connecting device 2 (10) are Z-shaped.

3. The working method of a micromechanical property testing device according to claim 1, characterized in that: The first clamping device (8) is a glass tube, the second clamping device (9) is a metal sheet, and the third clamping device (16) is a glass sheet.

4. A working method of a micromechanical property testing device according to any one of claims 1 to 3, characterized in that: The specific steps are as follows; 1) Select a suitable clamping device according to the stiffness of the sample to be tested, the suitable clamping device being the second clamping device (9) or the third clamping device (3), and fix the two ends of the sample to be tested on the first clamping device (8) and the two ends of the suitable clamping device; 2) Move the sample to the center of the microscope field of view, and adjust the operating table 1 and the operating table 2 in real time according to the microscope imaging results so that the sample is in a horizontal position; 3) Apply shear force to move the operating table 1 along the y direction, and use a microscope to observe and record the deformation of the clamping device and the sample to be tested until the sample to be tested breaks; 4) When the sample breaks, the clamping device is used as an Euler-Bernoulli beam for theoretical calculation, and its deflection curve should satisfy: w(x)=ax 3 +bx 2 Among them, a=P / 6EI, P is the applied force, E is Young's modulus, I is the moment of inertia, and b is a constant parameter. The deflection curve is fitted according to the above formula to obtain the values ​​of a and b. The values ​​of E and I can be obtained respectively according to the material and shape parameters of the clamping device. Then P=6aEI, that is, the shear force received by the sample when it breaks, and the shear strength value of the sample can be measured accordingly.

Images