金属磁记忆检测技术在机械设备早期故障诊断中的应用概述

摘要

Metal Magnetic Memory Testing (MMMT)is a kind of Non-Destructive Testing which can detect the position of stress concentration by the use of Metal Magnetic Memory effects.Using this method the stress concentration area caused by micro-defect and initial failure and damage can be found.So the paroxysmal fatigue damage can be avoided. By now,MMMT is the only effective NDT new method that can do early diagnosis to metal parts.By choosing proper signal characteristics to analyze the magnetic memory signals, the danger positions with characteristic stress concentration on tested metal parts could be detected reliably and accurately.The MMMT theory and signal characteristics were summarized.%金属磁记忆检测技术(Metal Magnetic Memory Testing)是一种利用金属磁记忆效应来检测部件应力集中部位的无损检测方法.它能够对铁磁金属构件内部的应力集中区,即微观缺陷、早期失效和损伤等进行诊断,防止突发性的疲劳损伤.金属磁记忆检测技术是迄今为止对金属部件进行早期诊断唯一行之有效的一种无损检测新方法.选择适当的特征值对磁记忆信号进行分析,可以准确可靠地探测出被测对象上以应力集中区为特征的危险部位.介绍了金属磁记忆技术理论,并总结了用于机械设备早期故障诊断的特征值.