溶接部に存在する表面き裂の安定成長試験　第２報　Ｑファクタの解析

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  • Stable Crack Growth of Surface Crack across the Fusion Line. 2nd Report. Analysis of Q-Factor.
  • ヨウセツブ ニ ソンザイスル ヒョウメン キレツ ノ アンテイ セイチョウ シ

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Stable crack growth tests are conducted using CT specimens and surface-cracked specimens welded of A533B steel and HT80 steel. The distribution patterns of SZW and Δa values along the crack front are measured, and the effects of welding and fusion line are considered. The results show that the effects of fusion line appear clearly in Δa distribution along the crack front. Δa is much larger in HT80 steel than in A533B steel. Three dimensional finite element analyses are then conducted. The J-integral distribution along the crack front is obtained and the crack tip fields are compared with HRR (Huthcinson, Rice and Rosengren) solutions. The Q-factor is also evaluated along the three-dimensional crack front. It is found that the Q-factor controls the local crack growth behavior near the fusion line.

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