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Hysteresis and acoustic emission as non-destructive measures of the fatigue process in metals
Summary
Magnetic hysteresis and acoustic emission were investigated as non-destructive indicators of fatigue damage accumulation in steel, based on how microplastic processes alter grain texture and dislocation structure over repeated loading cycles. The results support using these piezomagnetic and acoustic signals as early warning indicators of structural fatigue degradation.
Abstract : Piezomagnetic effects are due to interactions between the mechanical and magnetic mesostructure of materials. In particular, under repeated loading cycles, microplastic processes generate dislocations and modify the texture of grains, voids, inclusions, and other defects. These mechanical changes in turn alter the arrangement of the coextensive ferromagnetic domain structure and affect the intensity of the associated magnetic fields.