力学的性質の急変部に切欠きをもつ材の塑性変形挙動とき裂開口変位

概要

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Fracture performance of welds is influenced by mechanical and/or metallurgical heterogeneity caused inevitably in the welded joint. In the present paper, consideration has been carried out of plastic deformations and crack opening behaviors of cracked welds with mechanical heterogeneity, in particular, in strength. Finite element analyses based on elasto-plastic theory have been conducted for overmatched and undermatched weld joints with crack existing along fusion line under tension or bending. A considerably unsymmetrical plastic behavior is observed in the notched welds with heterogeneity in strength. Accordingly, the plastic behavior results in unsymmetriccal crack opening. As the degree of unsymmetrical opening is affected by the strength ratio of weld metal to base metal, the total opening displacement calculated from global COD does not necessarily control deformation of each material in the vicinity of crack tip. The local COD defined in the present paper may become an appreciate measure of deformation of crack tip as same in homogeneous material, exclusive of the part of which strength level is considerably higher than that of other part.
社団法人溶接学会の論文
1983-02-05