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金属磁记忆检测技术作为一种新的无损检测方法,其突出的优点是不仅能发现铁磁构件的宏观缺陷,而且能指示出微观缺陷的应力集中部位。本文论述了金属磁记忆检测技术的基本原理,用有限元软件模拟了带孔Q345E钢板在拉伸试验下的应力分布,探讨了不同拉伸载荷下试板的磁记忆信号变化规律,研究了应力集中与磁记忆曲线梯度之间的关系。
As a new non-destructive testing method, metal magnetic memory detection technology has the outstanding advantages of not only finding the macroscopic defects of ferromagnetic components, but also indicating the stress concentration sites of micro-defects. In this paper, the basic principle of metal magnetic memory testing is discussed. The stress distribution of Q345E steel with holes under tensile test is simulated by finite element software. The variation of magnetic memory signal under different tensile loads is discussed. The relationship between concentration and magnetic memory gradient.