不同材料在不同应力状态下的磁记忆信号特征

发布时间：2018-04-08 10:48

本文选题：铁磁材料　切入点：无损检测　出处：《钢铁研究学报》2017年02期

【摘要】：磁记忆是力磁效应的一种表现,目前关于力磁效应的基本规律及机理研究还没有统一的定论。为了进一步对磁记忆效应的机理及不同材料不同应力状态下磁记忆信号特征进行试验性的研究,对不同铁磁材料(Q235,20号钢,45号钢)圆棒试件进行静载拉伸试验,分别测量某固定点处在线加载和在线卸载2种不同应力状态下的磁记忆信号。试验结果表明:3种不同材料在线加载时磁记忆信号各表现出了不同的力磁效应;在线卸载时测得的磁记忆信号更能有利地分析构件的应力阶段;弹性阶段时磁荷梯度GF变化幅度不大,接近屈服阶段时,磁荷梯度变化幅度变大,可以利用磁荷梯度对低碳钢材料应力定量评价。试验结果为磁记忆效应机理研究提供了一定的依据,也为金属磁记忆检测的定量检测提供了潜在可能性。
[Abstract]:Magnetic memory is an expression of magnetoforce effect. At present, there is no unified conclusion on the basic law and mechanism of force magnetic effect.In order to further study the mechanism of magnetic memory effect and the characteristics of magnetic memory signal under different stress states of different materials, the static tensile tests of round bar specimens with different ferromagnetic materials (Q235,20, 45) were carried out.The magnetic memory signals under two different stress states were measured at a fixed point under two different stress states: on-line loading and on-line unloading.The experimental results show that the magnetic memory signals of three different materials exhibit different force and magnetic effects when they are loaded on line, and the magnetic memory signals obtained during on-line unloading can be used to analyze the stress phase of the components more advantageously.The change of magnetic charge gradient GF is small in elastic stage, but the change range of magnetic charge gradient is larger at near yield stage, so the stress of low carbon steel can be quantitatively evaluated by magnetic charge gradient.The experimental results provide a certain basis for the study of the mechanism of magnetic memory effect, and also provide the potential for quantitative detection of metal magnetic memory.
【作者单位】：南昌航空大学无损检测技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(51261023)
【分类号】：TG115.28

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