The Relationship between Stress Concentration and Magnetic Signal under the Fatigue Test
摘 要
选用机械制造业广泛使用的优质合金钢40Cr试件,对其进行高周疲劳试验,研究疲劳试验过程中磁信号的特征值与应力集中位置及应力集中程度的关系,引入李萨如图分析法将磁信号法向、切向分量联合绘制二维检测曲线,探讨李萨如图面积与试件的疲劳损伤状态之间存在的关系。结果表明:利用微分后的梯度值突变特征,可准确确定试件疲劳加载引起的应力集中部位;磁信号在初始加载条件下会出现很大变化,随着疲劳循环次数的增加,磁信号变化缓慢,当试件进入裂纹萌生阶段时,磁信号显著增加;李萨如图面积与试件的疲劳损伤状态之间存在良好的对应关系。结果可望为磁记忆二维检测定量分析提供可靠的试验依据。
Abstract
High quality alloy steel 40Cr is widely used in mechanical manufacturing industry and is selected for the high-cycle fatigue experiments in the paper. The relationship between the characteristic value of magnetic signals during the process of fatigue testing and the stress concentration position and the degree of stress concentration has been researched. The normal component and the tangential component are together detected. The method of Lissajous figure is used to draw two-dimensional curve, the relationship between area of Lissajous figure and the fatigue damage state of the specimen is discussed. It turns out that the mutation characteristics of differential gradient value can be used to accurately determine the stress concentration area caused by fatigue loading; very big change appears in magnetic signals under the beginning of the loading condition, while with the increase of fatigue cycles, the magnetic signal changes slowly. When the crack propagation stage in the specimen is aroused, magnetic signals increase significantly; and there is a good corresponding relationship between area of Lissajous figure and the fatigue damage state of the specimen. It is expected to provide test analysis basis for the quantitative analysis of two-dimensional detection of magnetic memory effect.
中图分类号 TG115.28
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51065022)
收稿日期 2013/11/27
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备注方发胜(1963-),男,高级工程师,主要从事无损检测技术的研究与工程应用。
引用该论文: FANG Fa-sheng,ZHOU Pei,ZHANG Li-ming,RAO Qi,REN Ji-lin. The Relationship between Stress Concentration and Magnetic Signal under the Fatigue Test[J]. Nondestructive Testing, 2014, 36(3): 30~35
方发胜,周培,张利明,饶琪,任吉林. 疲劳试验下应力集中与磁信号的关系[J]. 无损检测, 2014, 36(3): 30~35
被引情况:
【1】高庆敏,丁红胜,刘波, "金属磁记忆信号的有限元模拟与影响因素",无损检测 37, 86-91(2015)
【2】胥永刚,孙兴芝,崔玲丽,张建宇, "高频疲劳损伤齿轮磁记忆效应的仿真",无损检测 37, 28-32(2015)
【3】任尚坤,黄隐,习小文,赵珍燕,段振霞, "Q235钢在扭转载荷作用下的磁化反转效应",无损检测 38, 30-33(2016)
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参考文献
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