利用磁记忆信号特征参数表征拉伸应力状态
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TH140.7; TG115.28

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国家自然科学基金资助项目(51578449,51478383,51378413);陕西省自然科学基金资助项目(2015JM5192)


Using the Characteristic Parameters of Magnetic Memory Signal to Evaluate the Tensile Stress State
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    摘要:

    通过对Q345B钢试件静载拉伸时法向磁场的在线测量,得到了不同载荷作用下的磁信号特征,研究了试件断裂处法向分量H p(y)和特征参量随应力的变化,并建立了磁场梯度指数与应力的量化关系。试验结果表明:当拉应力大于308 MPa时,H p(y)相对于弹性阶段磁信号发生反转现象;根据梯度最大值Kmax的极大值可准确判定试件是否进入塑性阶段;梯度最大值的算术平均值Kavgmax随应力变化的3个阶段分别对应力位移曲线的弹性阶段、塑性阶段和破坏阶段;Kavgmax值和断裂处Hp(y)值均可反映试件的损伤程度;梯度指数ξ值可表征试件的应力状态。分析结果表明:Jiles-Atherton模型可解释磁信号的反转现象;感应磁场模型可定性解释试件断裂处的磁信号变化原因,与试验结果一致。该研究为利用磁记忆检测技术进行应力表征提供了一种有效方法。

    Abstract:

    To investigate the signal characteristics of the specimen under different tensile loads, the normal component of surface spontaneous magnetic signal is measured on-line by the static tensile test of the Q345B steel plate specimen. The effects of stress on the normal component Hp(y) at the fracture position and characteristic parameters are analyzed. The quantitative correlation between the stress and magnetic field gradient index is obtained. The results show that Hp(y) signal reverses to the magnetic field in elastic stage when the stress is greater than 308 MPa. The maximum value of maximum gradient Kmax can be used to determine whether the specimen enters the plastic stage. The arithmetic mean of maximum gradient Kmax , namely Kavg max which varies with stress agrees with the elastic, plastic and failure stage of the force-displacement curve. Both Kavg max and Hp(y) at the fracture position can reflect the degree of damage, and gradient indexξcan evaluate the stress state of the specimen. Analyzed results reveal that Jiles-Atherton model can well explain the reversal phenomenon of magnetic signal. The model of inductive magnetic field can qualitatively explain the reason of the variation of magnetic field at the fracture position, which is consistent with the experimental results. The study suggests an effective stress evaluation method based on metal magnetic memory technique.

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  • 在线发布日期: 2017-09-03
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