繰り返し荷重を受ける亀裂を有する鋼板の弾塑性挙動とJ積分による評価

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Finite element analysis was performed to analyze the elastic-plastic behavior of cracked steel plate subjected to monotonic or repeating load. Variations of J-integrals obtained by integral paths around crack following the changes of loads are evaluated by the data of finite element analysis based on the stress-strain simulation of steel for arbitrary cycles. Independency of J-value from integration paths acrossing the elastic and plastic zones is proved numerically for the cases of monotonically increasing external loads. The variation of the J integral for the changes of clip gauge displacements for 3 mm thick steel compact tensions specimen obtained by FEM analyses of nine contributors and the experimental J value are agreed well with the corresponding results obtained by authors^<3)>. Bucci's estimation^<7)> between J-integral and over all strain for single cracked plate subjected to tension at ends, obtained by the elastic and rigid plastic analyses is proved clarifying continuous transition from linear to nonlinear behavior by authors' analysis. Changes of J-integral values for the cyclic change of tensile load obtained from the results of FEM analyses are shown. Finally, the estimation formula of crack growth rate da/dn of steel plate subjected to pulsating tension is expressed by the variation of J integral taking the Elber's crack closure effect into account is proposed and showed better agreement with the experimental data comparing with Paris' formula expressed by effective change of stress intensity factor.
社団法人日本船舶海洋工学会の論文

繰り返し荷重を受ける亀裂を有する鋼板の弾塑性挙動とJ積分による評価

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