Abstract
軽水炉におけるLOCA-ECCS作動時の圧力容器に対する熱衝撃は安全評価の上で重要な問題である.本論文では実厚圧力容器綱平板を熱衝撃破壊実験に供し,非線形破壊力学のパラメータを用いて三次元解解を行った.この解析に先立ち,非線形破壊力学のパラメータであるJ積分,J^^^積分を三次元場へ拡張し,ここでは,おのおの2種の方法を提案した.さらに,ここで定式化したJ積分の評価式を用いて三次元き裂の解析例も示した.
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