Evaluation of Residual Stresses in Butt-Welded Joints by Residual Magnetic Field Measurements
Measuring residual stray field (RMF) signals provides a promising tool to analyze the stress in ferromagnetic welded materials. In this paper, the variations of the normal component of the RMF, Hp(y), perpendicular to welded seam are measured. The finite element method is used to model residual stress in the specimen. The influence of residual stress on the Hp(y) component is shown. It is found that the distributions of the Hp(y) component are described by a Boltzmann fitting curve, show a good qualitative correlation with residual stress. A quantitative method for the evaluation of residual stress in ferromagnetic steels based on the gradient of the Hp(y) component and equivalent (vonMises) stress is presented.
Xianghua Liu, Zhenhua Bai, Yuanhua Shuang, Cunlong Zhou and Jian Shao
B. Liang et al., "Evaluation of Residual Stresses in Butt-Welded Joints by Residual Magnetic Field Measurements", Applied Mechanics and Materials, Vols. 217-219, pp. 2427-2434, 2012