Quasi-static in-situ biaxial tensile property testing instrument

Abstract

The invention relates to a quasi-static in-situ biaxial tensile property testing instrument, and belongs to the field of precise scientific instruments. The quasi-static in-situ biaxial tensile property testing instrument includes a driving unit, a transmission unit, a clamping unit and a detection unit. According to the driving unit, two direct-current servo motors provide power sources for the X direction and the Y direction respectively, motor output torque is firstly decelerated and reversed through a turbine mechanism of the transmission unit, two pairs of four precise trapezoidal lead screw nut pairs in the X direction or the Y direction are driven, and the clamping unit is driven to complete linear motion; The clamping unit is used for clamping the test piece by virtue of a clamp body mounted on a sliding nut seat so as to realize load loading; the Y-direction clamp has a prefabricated inclination angle of 25 degrees, and the X-direction clamp is provided with a hinge. The quasi-static in-situ biaxial tensile property testing instrument has the advantages of small volume and compact structure, can be placed in most large-chamber scanning electron microscopes, and belongs to the field of precise scientific instruments. The in-situ biaxial tensile test in a plane stress state can be provided for a tested sample under a scanning electron microscope.

Description

technical field [0001] The invention relates to the field of precision scientific instruments, in particular to a quasi-static in-situ biaxial tensile performance testing instrument compatible with a scanning electron microscope, which is a biaxial biaxial tensile testing platform integrating driving, loading, detection, and force environments, and It is a high-performance comprehensive precision experimental testing platform that can be placed under a scanning electron microscope to observe and analyze the microscopic crystal structure and macroscopic mechanical properties of materials. Background technique [0002] In-situ mechanical performance testing refers to the process of testing the mechanical properties of specimen materials at the micro / nano scale, through electron microscopes, atomic force microscopes, optical microscopes and other instruments to measure the microscopic deformation and damage of materials under various loads. A mechanical testing method with full...

AI Technical Summary

Problems solved by technology

[0003] Because the existing in-situ biaxial testing device cannot provide two-way movement, the central area of ​​the sample will inevitably cause unidirectional movement during the test when it is stretched. For in-situ observation zones that require quasi-static and high resolution very inconvenient

[0004] The structure of the existing biaxial tensile test system is too large and the cooperation between the various modules is not compact enough. The problem is that it cannot match the existing imaging technology such as the scanning electron microscope, so it can only complete the out-of-position detection, and the detection of each There is a lack of effective research on the micromechanical behavior and damage mechanism of anisotropic materials under biaxial tensile loading

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