焊缝中疲劳裂纹萌生与扩展的磁记忆信号特征研究
首发时间:2014-01-13
摘要:根据金属磁记忆检测原理,通过分析Q235钢带缺口的焊缝疲劳试样表面在固定通道不同疲劳载荷波形下Hp(y)及其梯度dHp(y)/dx的变化,探讨疲劳裂纹在焊缝处萌生、扩展过程中磁记忆信号的变化规律。结果表明:在整个疲劳加载过程中,焊缝区的磁记忆信号法向分量的幅值及其梯度随疲劳次数的增加呈现规律性变化;随着疲劳次数的增加磁记忆信号法向分量过零点的位置和其强度梯度曲线出现极大值的位置向试件断裂处靠近。可以通过焊缝的磁记忆信号预测其损伤状态和应力集中部位。
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Study on the Metal Magnetic Memory Signal Feature of Fatigue Crack Initiation and Propagation in Welding Joints
Abstract:This research based on metal magnetic memory testing principle,through the analysis of notched weld fatigue specimen surface of Q235 under different load waveform of Hp (y) and its gradient dHp (y) /dx changes in fixed channel , to investigate the changes of fatigue crack stress concentration in the process of initiation, propagation in weld joint.The results demonstrate: In the whole loading process, the maximum value of the normal components and its gradient of metal magnetic memory signal of weld zone change with fatigue cycle increasing regularity; with fatigue cycle increasing magnetic memory signal normal component in zero position and gradient curve in maximum value position near to the specimen fracture zone. The magnetic memory signal of weld joint can predict the damage state and the stress concentration position.
Keywords: nondestructive testing magnetic memory signal fatigue load weld joint
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No.4579808948047138****
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