デジタル画像相関法による溶接部材表面のひずみ分布評価

抄録

Non-uniform strain distribution was measured and the effect of a crack on the distribution was investigated on fatigue specimens with a repair weld portion. The strain distribution in the initial loading showed that an elastic deformation mainly occurred in the welded portion while a large plastic deformation occurred in the base material. This behavior was reproduced qualitatively by the finite element analysis where the materials properties on the basis of the strain measurement were applied. The length of the region where a crack affected the strain distribution was defined on the basis of the strain between two facets across a crack. It was confirmed that the length corresponded to the crack length on the painted surface that was read from the images taken.