A micro-mechanical property testing device and method

Abstract

The application discloses a micro-mechanical property testing device and method. The device comprises an electric micro-nano operation platform 1, which is connected with a clamping device 1; and an electric micro-nano operation platform 2, which is connected with a clamping device 2. The clamping device 1 and the clamping device 2 are respectively fixed with two ends of a sample to be tested, and are movable to perform alignment and force application. The method comprises the following steps: S1, fixing the two ends of the sample to be tested on the clamping device 1 and the clamping device 2 respectively; S2, adjusting the operation platform 1 and the operation platform 2 to make the sample to be tested horizontal; and S3, moving the operation platform 1 and recording deformation of the clamping device until the sample is broken. The application can in-situ measure the shear strength of a micro sample.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of instrument science and technology, and particularly relates to a micro mechanical property testing device and method. BACKGROUND

[0002] Micro mechanical characterization technology is an important technical means for characterizing the micro-nano mechanical 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 measured, material fixation, application of shear force, and unloading of force. However, due to the small size of micro materials, the applied shear force must be extremely small, and the deformation process of the material must also be observed using a microscope. Therefore, traditional shear property measurement methods are not applicable, and a micro-scale shear force and deformation observation and measurement method must be developed.

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

[0005] In view of the need for micro material shear strength measurement, the application provides a method for measuring the shear mechanical properties of micro-scale materials, which can fill the existing research gap. SUMMARY

[0006] In view of the above problems, the application provides a micro mechanical property testing device and method, which can realize the application and measurement of micro-scale shear force, has high precision, strong adaptability, and is easy to operate.

[0007] To achieve the above purpose, the technical scheme adopted by the application is:

[0008] A micro mechanical property testing device, comprising an operation table one, an operation table two, a clamping device one, a clamping device two and a clamping device three, the sample to be measured is arranged between the operation table one and the operation table two, and a suitable clamping device is selected according to the stiffness of the sample to be measured, the suitable clamping device being the clamping device two or the clamping device three, and the two ends of the sample to be measured are fixed on the clamping device one and the corresponding suitable clamping device respectively

[0009] The operation platform one includes a base one, an X-direction movement motor one, a Y-direction movement motor one, a motor support module, a Z-direction movement motor one, a connecting device fixed platform one and a connecting device one, the base one is fixedly connected with the lower end of the X-direction movement motor one through bolts, the X-direction movement motor one is fixedly connected with the lower end of the Y-direction movement motor one through bolts, the Y-direction movement motor one is fixedly connected with the lower end of the motor support module through bolts, the motor support module is fixedly connected with the Z-direction movement motor one through bolts at the front end, the Z-direction movement motor one is fixedly connected with the connecting device fixed platform one through bolts at the front end, the connecting device fixed platform one is fixedly connected with the upper end of the connecting device one through bolts at the front end, and the connecting device one is fixedly connected with the clamping device one through bonding at the lower end.

[0010] The operation platform two includes a connecting device two, a connecting device fixed platform two, a Z-direction movement motor two, an X-direction movement motor two, a Y-direction movement motor two and a base two, the base two is fixedly connected with the Y-direction movement motor two through bolts at the upper end, the Y-direction movement motor two is fixedly connected with the X-direction movement motor two through bolts at the upper end, the X-direction movement motor two is fixedly connected with the Z-direction movement motor two through bolts at the upper end, the Z-direction movement motor two is fixedly connected with the connecting device fixed platform two through bolts at the front end, the connecting device fixed platform two is fixedly connected with the upper end of the connecting device two through bolts at the front end, and the connecting device two is fixedly connected with the clamping device two or the clamping device three through bonding at the lower end.

[0011] As a further improvement of the application, the connecting device one and the connecting device two are Z-shaped.

[0012] As a further improvement of the application, the clamping device one is a glass tube, the clamping device two is a metal sheet, and the clamping device three is a glass sheet.

[0013] The application provides a working method of a micro-mechanical property testing device, and the specific steps are as follows.

[0014] 1) According to the rigidity of the sample to be measured, a suitable clamping device is selected, the suitable clamping device is the clamping device two or the clamping device three, and the sample to be measured is fixed at the two ends of the clamping device one and the suitable clamping device.

[0015] 2) The sample is moved to the center of the field of view of the microscope, and according to the imaging result of the microscope, the operation platform one and the operation platform two are adjusted in real time so that the sample is located at a horizontal position.

[0016] 3) A shearing force is applied, the operation platform one is moved along the y direction, and the deformation of the clamping device and the sample to be measured is observed and recorded by using the microscope until the sample to be measured is broken.

[0017] 4) When the sample is broken, the clamping device is theoretically calculated as an Euler-Bernoulli beam, and the deflection curve thereof should satisfy:

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

[0019] Wherein a = P / 6EI, P is the applied force, E is the Young's modulus, I is the moment of inertia, b is a constant parameter, the values of a and b can be obtained by fitting the deflection curve according to the above formula, and the values of E and I can be obtained according to the material and shape parameters of the clamping device, then P = 6aEI, that is, the shear force received by the sample when broken, so that the shear strength value of the sample can be measured.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] 1) The present application can realize the initial position level of the sample through the cooperative movement of the double micro-nano operation table, and ensure the accuracy of force measurement.

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

[0023] 3) The measuring device of the present application has multiple degrees of freedom, large stroke and large working space, and can realize automatic measurement of multiple degrees of freedom through cooperation with the microscopic imaging device, can measure various shape materials such as strips, sheets and columns, has wide adaptability, high precision, and has great significance for scientific research in the fields of materials and biological engineering. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of the micro material shear strength measuring device in the present application;

[0025] Figure 2 is a work flow chart for measuring the shear strength of the micro material in the present application;

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

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

[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. Connection device fixed platform 1; 7. Connection device 1; 8. Clamping device 1; 9. Clamping device 2; 10. Connection device 2; 11. Connection device fixed 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 application will be further described in detail below in combination with the drawings and specific embodiments:

[0031] The application comprises a micro-mechanical property testing device. The device comprises an electrically driven micro-nano operation platform 1, which can realize x-y-z three-axis movement, and a clamping device is installed at the end of the operation platform 1, which can realize the fixation of the sample to be tested, and the clamping device can also apply shear force, and the applied shear force can be calculated through the deformation of the clamping device, so as to calculate the shear strength; an electrically driven micro-nano operation platform 2, on which a clamping device 2 is connected, which can realize the fixation of the other end of the sample to be tested. Through the cooperative movement of the operation platform 1 and the operation platform 2, the sample to be tested can be moved to a horizontal initial position and the shear force can be applied.

[0032] The shear strength measurement method has a working process as shown in Figure 2 , and is used for shear strength measurement as shown in Figure 3 , which comprises the following steps: step 1, selecting a clamping device with appropriate rigidity, and fixing the two ends of the sample to be tested on the clamping device 1 and the corresponding appropriate clamping device respectively; step 2, adjusting the operation platform 1 and the operation platform 2, so that the sample to be tested is in a horizontal initial position; step 3, moving the operation platform 1 and recording the deformation of the clamping device 1, until the sample breaks.

[0033] Example 1:

[0034] As shown in Figure 1 , the application comprises a device for micro-shear strength measurement. First, the two ends of the sample to be tested are fixed on the clamping device 1 and the clamping device 2. If the sample strength is high, the clamping device 1 can be replaced by the clamping device 3. Then, the sample is moved to the center of the microscope field of view. According to the imaging results of the microscope, the operation platform 1 and the operation platform 2 are adjusted in real time, so that the sample is in a horizontal position. Then, the operation platform 1 is moved along the y direction, and the deformation of the clamping device and the sample to be tested is observed and recorded using the microscope, 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 Figure 4 . The clamping device is calculated as an Euler-Bernoulli beam, and its deflection curve should satisfy:

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

[0036] Wherein, a=P / 6EI, P is the applied force, E is the Young's modulus, I is the moment of inertia, b is a constant parameter. According to the above formula to fit the deflection curve, the value of a and b can be obtained. According to the material and shape parameters of the clamping device, the values of E and I can be obtained respectively, then P=6aEI, that is the shear force received by the sample when breaking. Thus the shear strength value of the sample can be measured.

[0037] The above description is only the preferred embodiment of the present application, not any other form of the application is limited, and any modification or equivalent change according to the technical essence of the present application still belongs to the scope of the present application.

Claims

1. A micro-mechanical property testing device, comprising an operating table one, an operating table two, a clamping device one (8), a clamping device two (9) and a clamping device three (16), a sample to be tested is arranged between the operating table one and the operating table two, and a suitable clamping device is selected according to the stiffness of the sample to be tested, the suitable clamping device is the clamping device two (9) or the clamping device three (16), and the two ends of the sample to be tested are fixed on the clamping device one and the corresponding suitable clamping device respectively. The operating table one comprises a base one (1), an X-direction motor one (2), a Y-direction motor one (3), a motor support module (4), a Z-direction motor one (5), a connecting device fixed platform one (6) and a connecting device one (7), the base one (1) is fixedly connected with the lower end of the X-direction motor one (2) through bolts, the X-direction motor one (2) is fixedly connected with the lower end of the Y-direction motor one (3) through bolts, the Y-direction motor one (3) is fixedly connected with the lower end of the motor support module (4) through bolts, the front end of the motor support module (4) is fixedly connected with the Z-direction motor one (5) through bolts, the front end of the Z-direction motor one (5) is fixedly connected with the connecting device fixed platform one (6) through bolts, the front end of the connecting device fixed platform one (6) is fixedly connected with the upper end of the connecting device one (7) through bolts, and the lower end of the connecting device one (7) is fixedly connected with the clamping device one (8) through adhesion. The operation platform two includes a connecting device two (10), a connecting device fixed platform two (11), a Z direction movement motor two (12), an X direction movement motor two (13), a Y direction movement motor two (14) and a base two (15), the upper end of the base two (15) is fixedly connected with the Y direction movement motor two (14) through bolts, the upper end of the Y direction movement motor two (14) is fixedly connected with the X direction movement motor two (13) through bolts, the upper end of the X direction movement motor two (13) is fixedly connected with the Z direction movement motor two (12) through bolts, the front end of the Z direction movement motor two (12) is fixedly connected with the connecting device fixed platform two (11) through bolts, the front end of the connecting device fixed platform two (11) is fixedly connected with the upper end of the connecting device two (10) through bolts, and the lower end of the connecting device two (10) is fixedly connected with the clamping device two (9) or the clamping device three (16) in a bonding mode, characterized in that: The specific steps are as follows: 1) selecting a suitable clamping device according to the stiffness of the sample to be tested, the suitable clamping device is the clamping device two (9) or the clamping device three (3), and the two ends of the sample to be tested are fixed on the clamping device one (8) and the suitable clamping device; 2) moving the sample to the center of the microscope field of view, adjusting the operating table one and the operating table two in real time according to the imaging results of the microscope, so that the sample is located in a horizontal position; 3) applying a shear force, moving the operating table one along the y direction, observing and recording the deformation of the clamping device and the sample to be tested using a microscope 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 the deflection curve thereof should satisfy: ； wherein, P = 6aEI, where P is the applied force, E is the Young's modulus, I is the moment of inertia, a and b are constant parameters, and the values of a and b can be obtained by fitting the deflection curve according to the above formula, and the values of E and I can be obtained according to the material and shape parameters of the clamping device, respectively. Thus, the shear strength value of the sample can be measured.

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

3. The working method of the micro-mechanical property testing device according to claim 1, characterized in that: The clamping device one (8) is a glass tube, the clamping device two (9) is a metal sheet, and the clamping device three (16) is a glass sheet.

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