Finite Element Evaluation of J-integral in 3D for Nuclear Grade Graphite using COMSOL Multiphysics®
Evaluation of J-integral in three dimensional bimodular stress field has been carried out for a cracked three point bend specimen having properties of nuclear grade graphite (2020). The additional area integral has an important role in J-integral. The stress dependent elasticity formulation required for this study has been carried out using commercial finite element software COMSOL Multiphysics®. It has been observed that in contrast to unimodular models the degree of path independency is inferior in nature as the ET/EC ratio deviates from the value of unity. The ET/EC ratio influences the value of the J-integral significantly. The severity of bimodular 3d crack progression behavior has been delineated with asymmetry of stress-distribution and distortion of neutral surface.
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