The metal magnetic memory testing method is a new technique for early nondestructive testing of ferromagnetic materials,and it can be adopted to detect the spontaneous leakage magnetic field of ferromagnetic members under the combined action of external stress and geomagnetic field.The magneto-mechanical effect refers to the changing relationship between magnetization and stress in a constant external magnetic field,and the two are essentially similar.Therefore,the physical essence of the magnetic memory effect is the magneto-mechanical effect under a weak magnetic field(geomagnetic field).Aiming at the classical Jiles-Atherton model of magneto-mechanical effect,a systematic,comprehensive,and complete formula derivation is carried out to analyze the physical and mathematical relations between its internal different variables,and the shortcomings of the Jiles-Atherton model are pointed out.Finally,the improvement research based on theoretical model is discussed,and the improved model well explains the asymmetric magnetization behavior under tensile and compressive stress.
Jiles-Atherton modelferromagnetic materialsnondestructive testingmagnetic memory effecttensile and compressive stress
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