Through the analysis of the J-A model, the metal magnetic memory signal of Δ B (the distance between Br and -Br) can reflect the fatigue degree, and can be verified by bending fatigue test of 45# steel. The test results show that Δ B has three stages in the fatigue process, which correspond to the entire crack propagation process. By measuring the Δ B values, the fatigue state of the specimen can be evaluated.
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