Numerical simulation and magnetic characteristic of typical ferromagnetic components in loading state
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摘要: 研究了鐵磁構件在受載狀態下表面產生漏磁的磁記憶現象,對含小孔平板進行了有限元分析,實測了受拉伸載荷時的漏磁場值.結果表明,應力集中對構件的磁特性有顯著影響,在應力引起的小范圍塑性變形區域存在有效的磁記憶信號,采用磁記憶方法對設備承載鐵磁構件由應力集中造成的早期損傷進行檢測是可行的.Abstract: The phenomenon of magnetic memory that the magnetic leakage field generates on the surface offerromagnetic components in loading state was investigated. The stress of the plate with a hole in the center was calculated by the finite element method and the magnetic leakage field of the plate under the load of tension was measured. The results indicate that stress concentration strongly affects the magnetic properties of ferromagnetic components. Valid magnetic memory signals exist in a small scale of plastic deformation zone. It is feasible to detect the initial damage of ferromagnetic components caused by stress concentration by the magnetic memory testing method.
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