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中文摘要：
为探索金属磁记忆信号在材料疲劳过程中的变化规律，选用48MnV钢为材料，以其疲劳极限为负载作标准拉压疲劳试验，并采用金属磁记忆诊断仪检测材料疲劳过程中磁记忆信号的变化。试验结果表明，磁记忆信号在整个疲劳过程中表现出振荡、突变和收敛三大规律，即：磁记忆信号随疲劳循环次数的增加而上下振荡；在500万次疲劳循环附近，磁记忆信号存在一个突变点；该突变点前后，磁记忆信号随疲劳循环次数增加均有明显的收敛现象。
英文摘要：
To develop the variation law of magnetic memory signals during the fatigue of material, 48MnV steel was used to carry through tension-compression fatigue test under the load of its fatigue limit. During the test, magnetic memory signals were measured by metal magnetic memory instrument. The results show that magnetic memory signals have following three laws. magnetic memory signals vibrate during the whole fatigue process; a break point exists near 5 million cycles; before and after the break point, the magnetic memory signals both have a trend of concentration.
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