Ultralow-temperature in-situ stretching table and scanning electron microscope ultralow-temperature in-situ stretching test system

Abstract

The invention discloses an ultralow-temperature in-situ stretching table and a scanning electron microscope ultralow-temperature in-situ stretching testing system, and relates to the field of ultralow-temperature mechanical property testing. According to the invention, the problem that crack initiation, expansion, necking and fracture of a material in an ultralow temperature environment cannot be dynamically captured in a traditional tensile property test is solved. A low-temperature refrigerator is installed in a refrigerator reserved square hole of a bottom plate, a first lead screw assembly and a second lead screw assembly are arranged above the bottom plate side by side, the two ends of the first lead screw assembly and the two ends of the second lead screw assembly are rotationally connected with two side plates correspondingly, and a driving device is installed on the outer end face of one side plate of a rack. The two power output ends of the driving device are connected with the first lead screw assembly and the second lead screw assembly correspondingly. The first clamp assembly is installed on the end face of the side, close to the low-temperature refrigerator, of the first sliding block fixing assembly, and the second clamp assembly is installed on the end face of the side, close to the low-temperature refrigerator, of the second sliding block fixing assembly. The ultralow-temperature in-situ stretching table and the scanning electron microscope ultralow-temperature in-situ stretching testing system are used for dynamically capturing crack initiation, expansion, necking and fracture of the material in an ultralow-temperature environment.

Description

technical field [0001] The invention relates to the field of ultra-low temperature mechanical property testing, in particular to an ultra-low temperature in-situ stretching platform and a scanning electron microscope ultra-low temperature in-situ stretching test system. Background technique [0002] With the rapid development of science and technology, the requirements for materials (metals, ceramics, polymers, composite materials and coating materials) are becoming more and more stringent, especially in the fields of aerospace, petroleum and petrochemical industries, when materials are used in low temperature environments When the temperature is high, the properties of the material, especially the mechanical properties, will show significant changes. In general, as the temperature decreases, the strength and hardness of the material increase, while the plasticity and toughness decrease. Metal materials may experience a sharp drop in plasticity and toughness at a certain lo...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional tensile performance test cannot dynamically capture the crack initiation, expansion, necking and fracture of the material in the ultra-low temperature environment, and further provide an ultra-low temperature in-situ stretching table and scanning electron microscope ultra-low temperature in-situ stretching test system

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