ABSTRACT

The goal of this research is to correlate the piezomagnetic field with the stress and the stress concentration degree of ferromagnetic steels. Specimens of X80 steels were machined into smooth plates with circular holes in the center and tensile tests were carried out to detect the online piezomagnetic field on the surface of defective specimens. The relationship between the distribution of the stress and the distribution of the piezomagnetic field components was systematically investigated. Compared with the normal component and its gradient, the tangential component showed a better correlation with the distribution of the stress. A piezomagnetic parameter was defined to characterize the abnormal changes of the tangential component around the defect. Quantitative algorithms were established to evaluate the stress concentration degree on the basis of piezomagnetic parameters. This research will be a supplement of stress evaluation methods based on magnetic measurement technologies.

摘要

本研究的目标是将压电磁场与铁磁钢的应力和应力集中程度相关联。将X80钢试样加工成中心带有圆孔的光滑板，并进行拉伸试验，检测缺陷试样表面的在线压电磁场。系统地研究了应力分布与压电磁场分量分布之间的关系。与法向分量及其梯度相比，切向分量与应力分布具有更好的相关性。定义了一个压磁参数来表征缺陷周围切向分量的异常变化。建立了基于压磁参数评估应力集中程度的定量算法。本研究将是对基于磁测量技术的应力评估方法的补充。