Device for testing micro-torsion mechanical property of low-dimension material

Abstract

The invention provides a device for testing the micro-torsion mechanical property of a low-dimension material. The device comprises a stander, a force sensor, a micro-torsion sensor, a torsion wire rotation angle measurement component, an upper chuck, a lower chuck, a stepping motor, a three-dimensional translation table, a screw and nut component, a servo controller, an analog-to-digital collection card and a computer system, wherein both ends of a tension wire of the micro-torsion sensor are tensioned and fixed on a bracket and have high rigidity and stability; by replacement of the torsion wire, a measurement range can be adjusted; moreover, the force sensor is arranged at the upper end of the micro-torsion sensor, so that an axial force during torsion test can be detected in real time. In the device, a rotation angle of the torsion wire is measured in a manner of combining a light target and a photoelectric displacement sensor; and compared with a conventional light lever method, the device has a compact structure, high automation degree and high stability. By regulation of the three-dimensional translation table, an upper chucking point and a lower chucking point can be aligned. The computer system can obtain a torque-rotation-angle curve of a test sample in real time. The device is applicable to micro-torsion mechanical property of the low-dimension material.

Description

technical field [0001] The invention relates to a device for testing the micro-torsion mechanical properties of low-dimensional materials such as fibers and films, and belongs to the field of precise measurement of mechanical properties of micro-scale materials. Background technique [0002] Micro-electromechanical systems (MEMS) are integrated microsystems that integrate sensing, information processing and execution, and have been widely used in acceleration sensors, inertial, pressure sensors, micro jet engines, large-scale data storage systems and Miniature biochemical analysis equipment, etc., the application field is still expanding. The design and material selection of MEMS systems use a large number of low-dimensional materials such as silicon films, metal films, and various fibers with geometric feature sizes on the order of microns or submicrons. Therefore, accurate and reliable testing of the mechanical behavior of such materials is not only crucial for the safety...

AI Technical Summary

Problems solved by technology

The problem with this method is that the calibration of the driving force is difficult, the small size of the sample affects the test results, and the measuring range of the device is small

The device still has disadvantages such as inconvenient clamping and centering of the sample, poor structural stability, and low efficiency in reading angle data.

[0004] To sum up, the micro-torsion experiment is the most direct and effective means to observe the scale effect and torsional mechanical properties of low-dimensional materials, and its testing method is still far from perfect.

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