28 溶接継手脆性き裂伝播挙動に及ぼす入熱・集合組織の影響 : 溶接継手脆性き裂伝播のシミュレーション(第2報)

概要

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In the previous paper, influence of applied stress, residual stress and toughness of welded joint on brittle crack propagation was analyzed based on a fracture mechanics model developed by the authors. This model assumes that a crack propagates along the cleavage plane with the highest tensile normal stress among the cleavage planes. Results of numerical simulation were compared with the experimental results which were carried out in the SR 147 research committee of the Shipbuilding Research Association of Japan, and it was shown that the model used could explain the experimental results. In this paper, influence of weld heat input and texture of base metal on brittle crack propagation behavior along welded joint is analyzed using the above mentioned model. Weld heat input involves influence of residual stress (small or large) and toughness of welded joint (welded joint is divided into weld metal, CGHAZ and other HAZ, and toughness of each zone is assumed to be different). Texture of base metal is reflected by normal distribution, and by random for comparison. It is concluded that crack propagation path is dependent very much on weld heat input, but is not dependent on texture of base metal when a crack propagates in welded joint.