Method and system used for detecting metal material fatigue state

Abstract

The invention provides a method and a system used for detecting a metal material fatigue state. According to the invention, an acoustic emission sensor is adopted; acoustic emission voltage signals released by fatigue metal material are acquired; acquired acoustic emission energy signals are converted into energy accumulation within a specific frequency range; a fatigue state is converted according to the energy accumulation within the specific frequency range; and service life forecast is obtained.

Description

technical field [0001] The present invention relates to metal detection technology, more specifically, to a method and system for detecting the fatigue state of metal materials. Background technique [0002] Under the long-term action of variable stress and strain, the fracture phenomenon caused by cumulative damage of metal components is called fatigue. Many parts in actual work work under variable loads. In fact, most of the damage of auto parts is caused by fatigue, and 60%-80% of the fractures in aerospace engineering are caused by fatigue damage of structural materials. Fatigue problems not only appear in machinery, aerospace, civil engineering and other departments, but also in almost all engineering fields such as nuclear engineering and water and land transportation. [0003] At present, as a new dynamic non-destructive testing method, acoustic emission technology has been widely used in industries such as aerospace, bridges, materials, and geology. The phenomenon ...

AI Technical Summary

Problems solved by technology

However, due to various defects on the surface or inside of the actual part, under the loading of cyclic stress, micro-cracks may exist inside or on the surface, and the direction of expansion is uncertain, so it is difficult to measure with existing equipment

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