Biaxial tensile-fatigue test system and test method for material micromechanical properties

Abstract

The invention relates to a biaxial tension-fatigue test system and a test method for the micromechanical properties of materials, belonging to the field of precision scientific instruments. The test method applies an orthogonal tensile load to the specimen so that there are two mutually perpendicular tensile stresses on a plane, and at the same time, fatigue loads can also be applied to the specimen on the basis of the tensile load, which is used for research Micromechanical properties of materials under different load forms and load magnitudes. The system consists of precision loading-transmission unit, fatigue unit, mechanical and deformation signal detection unit, specimen clamping unit and other parts. The advantage is that the test system is novel and compact in structure, and can respectively realize uniaxial tensile test, biaxial tensile test, uniaxial tensile-fatigue test, biaxial tensile-fatigue test, and has good compatibility with optical microscopes, and can Dynamically study the correlation law between the microstructure of materials and the deformation and damage mechanism under the action of tensile-fatigue loads.

Description

technical field [0001] The invention relates to the field of precision scientific instruments, in particular to a biaxial tension-fatigue test system and a test method for the micromechanical properties of materials. It can be used as a test platform for uniaxial tension, biaxial tension, single-cycle tension-fatigue, and biaxial tension-fatigue material micromechanical properties, and it can also be used as a biaxial tension-fatigue material micromechanical property test. Axial co-frequency fatigue and biaxial non-coherent frequency fatigue tests. Moreover, the system can perform the above-mentioned micro-mechanical performance tests of various materials under some optical microscopes, so as to realize real-time observation of the micro-mechanical behavior and deformation damage process of the tested materials. At the same time, the quasi-static loading technology in the stretching process is realized through the reducer and the worm gear with a large reduction ratio; throug...

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Problems solved by technology

[0004] In addition, most of the plate and shell structural components in actual engineering are subjected to two-way loads, including single crystal metals, concrete, and some anisotropic composite materials. Only the mechanical properties of their single bearings under tensile loads are studied, and not objective

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