Quasi-static in situ biaxial tensile mechanical properties testing device under scanning electron microscope

Abstract

The invention relates to a quasi-static in-situ biaxial tensile mechanical performance testing device under a scanning electron microscope, which belongs to the field of precision scientific instruments. It includes power and transmission components, wedge transmission components, clamping components, support platforms and detection components; the power and transmission components are driven by a DC servo motor, which drives the trapezoidal screw after being decelerated by the gear box, and drives the wedge transmission mechanism. Realize the simultaneous stretching of the specimen by the clamping component along the X and Y directions, and use the strain gauge force sensor and the capacitive displacement sensor to detect the force and displacement during the stretching process. In the wedge transmission assembly, the wedge and the sliding seat contact through a 45-degree inclined plane, which has high rigidity and high transmission precision, ensuring accurate and synchronous loading during biaxial stretching. The overall structure is compact, and the size is within 106mm×106mm×64mm. It can be used in various scanning electron microscopes to realize in-situ observation of biaxial tensile experiments. It has a good application prospect and is of great significance to the study of the microscopic mechanical properties of materials.

Description

Technical field [0001] The present invention relates to the field of precision scientific instruments, in particular to a quasi-static in situ biaxial tensile mechanical performance test apparatus under scanning electron microscopy. Background [0002] Biaxial tensile experiment is an important method in the mechanical properties testing technology of materials, through the test piece two perpendicular directions simultaneously applied to the two directions of the two sides of the two sides of the tensile load of the method of the mechanical properties of the material to be measured, biaxial tensile tensile experiment can determine the elastic modulus, yield strength, tensile strength, Poisson's ratio and other important mechanical parameters, reflecting the stress state of the material under the two-way load, especially for the opposite-sex materials, can accurately describe its mechanical properties. Material in situ performance testing technology refers to a test technology th...

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Problems solved by technology

[0003] The existing in-situ biaxial stretching instruments are mostly aimed at in-situ observation methods such as optical microscopes, industrial CCD cameras, and high-speed cameras. These methods all have the problem of insufficient magnification, and the atomic force microscope has a small imaging range, Compared with the above methods, the scanning electron microscope has the advantages of high magnification and high imaging resolution, while there are few in-situ biaxial stretching instruments that use the scanning electron microscope as the in-situ observation method

In addition, the existing in-situ biaxial stretching instruments still have problems such as large size affecting observation and high synchronization requirements caused by the use of multiple power sources, so it is difficult to popularize

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