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Military weapons and equipment have been working under harsh and complex conditions for a long time during their service. Due to external loads and environmental corrosion, load-bearing beams, engine blades, fixed connectors and other stressed components are prone to fatigue defects and even brittle fractures caused by stress concentration. Socio-economic and operating personnel’s life safety poses a huge threat. Based on electromagnetic eddy current testing, this paper mainly studies the influence of metal material stress on material conductivity and establishes a mathematical model of conductivity and stress through experiments to provide theoretical help for sensor measurement signal processing.

A non-destructive testing method for metal stress based on conductivity measurement