关于利用金属磁记忆方法进行应力定量化评价问题的讨论

Discussion on Stress Quantitative Evaluation using Metal Magnetic Memory Method

对利用金属磁记忆检测技术在应力评价方面的研究现状进行总结,分析磁记忆检测原理和磁机械效应理论之间、应力磁化反转现象和接近定律之间的关系,认为金属磁记忆效应,是稳恒弱磁场激励下的一种力磁效应,符合磁机械效应理论的相关描述和结论。指出弱磁激励情况下力磁关系的非线性、以及检测结果易受众多干扰因素影响的特点,给利用磁记忆检测技术进行应力定量化评价带来实质性困难。磁记忆检测技术的优势,应在研究铁磁材料塑性阶段濒临损伤前的微观缺陷和信号异变的复杂关系以及应力集中和损伤综合作用下异变磁信号的快速和有效识别等方面。

Research status on stress quantitative evaluation using metal magnetic memory method is summarized. The relationship between magnetic memory principle and magnetomechanical effect theory, and the relationship between stress-induced magnetization reversal phenomenon and “law of approach” are analyzed, respectively. Magnetic memory effect is stress-magnetic effect in steady weak magnetic field excitation, consistent with the relevant descriptions and conclusions of magneticmechanical effect theory. The factors that the non-linear relationship of stress-magnetization in weak magnetic field excitation and the testing results susceptible to numerous interference factors bring substantial difficulties for stress quantitative evaluation. The complex relationship between microscopic defects and magnetic field aberration in plastic stage of ferromagnetic material, and the rapid and effective identification of abnormal magnetic signal under the combined effect of stress concentration and damage should be focused on in the future.