き裂近傍変位場測定データを用いたJ積分評価手順

概要

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A method for estimating J-integral from optically measured displacement fields for a power-law hardening material is described in this paper. The displacement gradients and strains along the circular path of the integration are determined from the measured displacement fields using the method of least-squares. Then, the stresses are determined using the elastic-plastic constitutive relations. J-integral values are then obtained by performing the numerical integration along the path. The effectiveness is demonstrated by applying the method to the displacement fields obtained using elastic-plastic finite element analysis and digital image correlation for single edge notched specimens. Results show that the J-integral values can be obtained by the proposed procedure.
日本実験力学会の論文