Study on Magnetic Memory Signal Character of Metal Plastic Deformation Based on OLCAO Algorithm

doi:10.3901/JME.2017.22.022

Abstract

Abstract: The plastic deformation is the early damage stage of metal under the stress. It can pre-judge the danger and achieve to early warning for equipment damage through effectively testing plastic deformation. Aimed at metal magnetic memory, force magnetic coupling calculation model of ferromagnetic material is build based on quantum mechanics density functional theory. The orthogonalized linear combination atomic orbitals (OLCAO) algorithm is used to calculate the magnetic characteristic change and magnetic memory signal character of ferromagnetic crystal under different stress. The results show that the stress induces electron motion state and distribution character change inside crystal, and then results in the change of band structure and the density of electron states. Material magnetic characteristic changes. Atomic magnetic moment quantitative changes with stress increase. Tensile stress induces atomic magnetic moment decrease. Compressive stress induces atomic magnetic moment increase. When the plastic deformation of metal emerges, system atomic magnetic moment changes suddenly and the curve appears knee point, as well as change velocity decreases. The special change characters of metal magnetic memory appear. The correctness of theory calculation results is validated by tensile test and compression test of ferromagnetic material.

Key words: electron motion, force magnetic coupling, magnetic memory, plastic deformation

CLC Number:

TH701

WANG Guoqing, YANG Lijian, YAN Ping, WEI Liwa, LIU Bin. Study on Magnetic Memory Signal Character of Metal Plastic Deformation Based on OLCAO Algorithm[J]. Journal of Mechanical Engineering, 2017, 53(22): 22-29.

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