Variable-temperature tension-torsion combined-load in-situ testing device and method for mechanical properties of materials

Abstract

The invention relates to a variable-temperature tension-torsion combined-load in-situ testing device and method for mechanical properties of materials, and belongs to the field of precise instruments.The device adopts a vertical type structure, and comprises a tension unit, a torsion unit, a force and displacement detection unit, a high- / low-temperature loading system and a sealed cavity. The mechanical properties of the materials under the loading of a single tension or torsion load in a variable-temperature environment can be tested, and particularly can also be tested in a tension and torsion combined load mode in the variable-temperature environment. A variable-temperature load module carries out loading by adopting the high- / low-temperature loading system, continuous temperature changing from -100 DEG C to 300 DEG C can be achieved, and thus, a complicated environment of the materials in an actual service environment is simulated. A biaxial-tension and forward-and-reverse-torsionload test is ingeniously achieved through a symmetrical mechanical structure, the microarea position invariance of in-situ monitored materials is thoroughly guaranteed, and thus, mechanical behaviorsand damage mechanisms of specific microareas of specimen materials can be dynamically monitored in situ.

Description

technical field [0001] The invention relates to a precision scientific instrument in the field of testing the microscopic mechanical properties of materials, in particular to an in-situ testing device and method for the mechanical properties of materials under variable temperature, tensile and torsion composite loads. It can accurately test and analyze the mechanical behavior and damage mechanism of materials subjected to tensile-torsional combined loads under high and low temperature environments. Background technique [0002] The in-situ testing technology of material micromechanical properties can dynamically monitor the micromechanical service behavior and deformation damage mechanism of materials, which has broad application prospects and important scientific significance. The means of in-situ monitoring include: scanning electron microscope technology, atomic force microscope technology, infrared absorption spectroscopy technology, X-ray diffraction technology, neutron...

AI Technical Summary

Problems solved by technology

However, the existing mechanical-thermal coupling devices can only realize high-temperature or low-temperature loading alone, and it is still difficult to study the mechanical properties of materials in the continuous temperature range from low temperature to high temperature.

[0004] The loading force of the existing tensile and torsion devices is small, such as the in-situ tester for the micromechanical properties of tensile-torsion composite load materials applied by Cui Lina et al. in 2014 (CN203811485U); Automobile clutch tension and torsion combination testing machine applied by Weimin et al. (CN204085884U)

In addition, the existing tensile torsion mechanical performance testing device is difficult to be coupled with the thermal field to achieve a temperature loading range of 83K~600K

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