OS1406 溶接残留応力場における表面き裂の進展評価(エネルギー機器の経年変化に関する健全性評価,オーガナイズドセッション)

概要

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This study presents evaluation method of crack growth rates and behaviors for semi-elliptical surface cracks in plates subjected to arbitrarily stress distributions. In order to calculate stress intensity factors, we developed influence coefficients based on the influence function method used finite element method. We enable to calculate stress intensity factors directly from arbitrarily stress distributions evaluated by finite element method, because of arbitrarily stress distributions as weld residual stress on the crack surface are difficult to approximate by polynomial equations. As a result of comparison between our calculations and the Newman-Raju formula, both stress intensity factors agreed well. From calculated stress intensity factors, we evaluated asymmetrical crack growth rates and behaviors in a short time.
2009-07-24