溶接残留応力場の再配分と疲労き裂伝播方向に関する研究

概要

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In order to investigate the effect of welding residual stress field on the fatigue crack propagation direction, the plate specimen which had crossed beads and asymmetric residual stress field, and another specimen which had one bead parallel to the load axis and located in the center of the specimen width were prepared. The material was high tensile strength steel and the welding was done by electron beam welding. Fatigue crack propagation tests were conducted under constant amplitude loading and stress ratio was nearly equal to zero. As the results, it was clarified that the direction of maximum tensile principal stress on a certain point beyond the crack tip was rotated to the direction of load axis, the crack tip coming near and loading being applied. And also it was recognized that the fatigue crack even though on the crossed beads specimen was propagated straightly perpendicular to the load axis, and that the fatigue crack propagation rate was plotted on same scatter band obtained in base metal against to ΔK_<eff>.
社団法人溶接学会の論文
1987-05-05