Apparatus and method for testing in-situ triaxial tension fatigue under multi-field coupling

Abstract

The invention relates to an apparatus and method for testing in-situ triaxial tension fatigue under multi-field coupling, belonging to the field of precise scientific instruments. The apparatus comprises a triaxial tension, fatigue loading and measuring subsystem, a thermal-field loading subsystem and a cantilever indentation loading and measuring subsystem. Loading of triaxial tension is realized as a motor, after decelerated by a two-grade worm and gear, drives a screw-screw nut pair mechanism to drive an tension platform; fatigue testing is realized via a flexible hinge driven by three piezoelectric ceramics; a thermal field is loaded as a heating system composed of a silicon nitride heating plate and a heating bench carries out heat-radiation heating on a test piece; cantilever indentation is applied as the piezoelectric ceramics drive the flexible hinge to allow a cantilever beam to generate downward displacement; and a main platform is provided with a location hole, a microscope can be integrated on the main platform through an installation platform, so in-situ observation of the test piece in loading is realized. The apparatus is reliable in principle and compact in structure and can accurately characterize micro-nano mechanical properties of a material under multi-field coupling like triaxial tension.

Description

technical field [0001] The invention relates to the field of precision scientific instruments, in particular to an in-situ triaxial tensile fatigue testing device and method under multi-field coupling. It is used to test the mechanical properties of materials under the combined loading of triaxial tension, fatigue and indentation, while loading the thermal field. Background technique [0002] It is well known that the destruction of materials is the result of the joint action of various external factors under specific circumstances. Therefore, it is necessary to predict the performance of materials under service conditions in advance. At present, universities and scientific research institutes at home and abroad are fiercely competing and competing in the field of in-situ testing under service conditions. Who can take the lead in seizing the commanding heights will not only promote my country's in-situ testing instruments to seize the new high ground in the international in...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an in-situ triaxial tensile fatigue test device and method under multi-field coupling, which solves the above-mentioned problems in the prior art, especially solves the measurement of the properties of coupled multi-fields in the case of multi-axial tension of materials question

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