Ductile Fracture Behavior of AS4P Under Mixed Mode (I/II) Loading

The aim of this study is to investigate the ductile fracture behavior under mixed mode (I/II) loading using SA533B pressure vessel steel. Anti-symmetric 4-point (AS4P) bending tests were performed to obtain theJ-R curves under two different mixed mode (I/II) loadings. In addition, finite element analysis using Rousselier Ductile Damage Theory was carried out to predict theJ-R curves under mixed mode (I/II) loadings. In conclusions, theJ-R curves under Mixed Mode (I/II) loading were located between those of Mode I and Mode II loading. When the mixity of mixed mode (I/II) loading was high, theJ-R curve of mixed mode (I/II) loading approached that of pure mode I loading after some amount of crack propagation. In contrast with the above fact, if the mixity was low, theJ-R curve took after that of pure mode II loading. Finally, it was found that the predictedJ-R curves made a good agreement with the test data through the tuning procedures of β values at the different mixed mode (I/II) loading.[PUBLICATION ABSTRACT]