The Characteristics of the Magnetic Memory Signal Under Different States for Q235 Steel Defect Samples
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摘要: 为了能够利用磁记忆曲线对试件的应力状态进行评估, 加工了Q235钢缺陷非对称试件。研究了在循环拉伸应力下, 其在在线加载、在线卸载和离线卸载三种不同状态下的磁记忆特征。结果表明, 弹性范围内三种状态下磁场强度曲线与初始曲线明显不同, 在整个弹性范围内各自保持自己的形状趋于稳定; 进入屈服阶段之后, 在线加载和在线卸载曲线开始在缺陷位置出现波峰波谷; 进入颈缩阶段后, 在线卸载曲线出现了大的跳跃。可见, 通过磁记忆曲线对试件的受力状态进行评估是可行的。Abstract: To evaluate the stress states of the components by the magnetic memory signal, Q235 steel defect asymmetrical samples were made. The characteristics of magnetic memory of Q235 steel in the three different states which are online-loading, online-unloading and offline-unloading under circle tensile stress have been studied. The results show that magnetic memory signals have different characteristics under different states. The curves in elastic range are different form that of initial stage and the curves of three states keep their shape on the whole elastic range respectively. In yielding stage, the curves of online-loading and online-unloading are beginning to appear wave peak and wave valley at the defect position. On the verge of necking, the curves of online-unloading appear a jump. From elastic range to necking, the curves of offline-unloading have no obvious change till fracture. It is feasible to preliminarily evaluate the stress state by the magnetic memory signal.
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[1] 崔常京, 董世运, 王逾涯, 等.疲劳载荷作用下应力集中部位金属的磁记忆现象[J].机械工程材料, 2008, 32(12): 51-54. [2] 任吉林, 林俊明.金属磁记忆检测技术[M].北京: 中国电力出版社, 2000. [3] Yang En, Li Luming, Chen Xing. Magnetic field aberration induced by cycle stress[J]. Journal of Magnetism Magnetic Materials, 2007, 312: 72-77. [4] 任吉林, 邬冠华, 宋凯, 等.金属磁记忆检测机理的探讨[J].无损检测, 2002, 24(1): 29-31. [5] 徐章英, 徐英, 王建斌, 等.裂纹漏磁场定量检测原理与应用[M].北京: 国防工业出版社, 2005. [6] Li Luming, Huang Songling, Wang Xiaofeng, et al. Magnetic field abnormality caused by welding residual stress[J]. Journal of Magnetism and magnetic materials, 2003, 261: 385-391. [7] 王丹, 董世运, 徐滨士, 等.应力集中部位的金属磁记忆检测研究[J].失效分析与预防, 2007, 2(2): 12-15. [8] 任尚坤, 李新蕾, 任吉林, 等.金属磁记忆检测技术的物理机理[J].理论研究, 2008, 22(2): 11-17. [9] 徐明秀.基于磁记忆检测技术的铁磁性材料旋转弯曲疲劳损伤诊断研究[D].哈尔滨: 哈尔滨工业大学, 2008. [10] 尹大伟, 徐滨士, 董世运, 等.不同检测环境下磁记忆曲线变化研究[J].兵工学报, 2007, 28(3): 319-323. [11] 尹大伟, 徐滨士, 董世运, 等.中碳钢疲劳试验的磁记忆检[J].机械工程学报, 2007, 43(3): 60-65. [12] 宋凯, 任吉林, 任乾坤, 等.基于畴壁聚合模型的磁记忆效应机理研究[J].无损检测, 2007, 29(6): 312-361. [13] Dong Lihong, Xu Binshi, Dong Shiyun etc. Study on magnetic memory signals of medium carbon specimens with surface crack precut during loading process[J]. Rare Metals, 2006(25): 431-435. [14] 蹇兴亮.金属磁记忆无损检测技术[J].现代物理知识, 2005, 17(6): 33-34.
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