Flexural fatigue mode adjustable tester for testing mechanical properties of materials, and testing method thereof

Abstract

The invention relates to a flexural fatigue mode adjustable tester for testing mechanical properties of materials, and a testing method thereof, belonging to the field of precision instruments. The tester comprises a flexural fatigue loading unit, a test piece clamping unit, an associated movement unit and a precise detection unit, wherein the flexural fatigue loading unit is powered by a direct current servo motor, a crank and rocker mechanism is driven to realize reciprocating swinging of a rocker by primary worm gear reduction, the rocker drives the clamping unit to realize reciprocating rotation, a bended test sample is repeatedly bent along with the reciprocating rotation of the clamping unit, and the associated movement unit does associated rotation and translation under the driving of the bended test sample. The tester has the advantages that the error of converting bending moment in three-point bending loading is avoided, the influence of the friction force of a support roller on the testing result is avoided, the bending moment and the bending angle can be accurately measured, different fatigue modes can be realized, and fatigue testing with different stress amplitudes and different average stresses can be realized.

Description

technical field [0001] The invention relates to the field of precision instruments, in particular to a material mechanical performance tester and a test method that can adjust a bending fatigue mode. Different from the common three-point bending loading mode, an approximate cantilever bending load can be applied to the specimen. Fatigue tests with different stress amplitudes and different average stresses can be realized. The fatigue test platform provides a brand-new method for bending fatigue test detection. Background technique [0002] Statistical analysis shows that fracture, wear and corrosion are the main failure modes of mechanical parts, and the economic losses caused by wear and corrosion are huge every year in the world. However, since the wear and corrosion of mechanical parts are carried out slowly during the working process of the machine, the normal operation of the machine can be ensured by overhauling and replacing parts, and accidents can be avoided. The...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a material mechanical performance tester and testing method that can adjust the bending fatigue mode, which solves the problems of the single fatigue load mode and the inability to accurately measure the bending moment and bending angle.

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