Edge Fracture Prediction Using Uncoupled Ductile Fracture Models for DP780 Sheet
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This paper is a contribution to the prediction of edge fracture behavior using uncoupled ductile fracture models. A fully integrated simulation framework for the edge fracture prediction is proposed with the shear-induced pre-damage considered. User-defined material subroutines are coded with uncoupled ductile fracture models (Lou-Huh, Oh, Brozzo) incorporated, which are calibrated using the fracture strains of various loading paths. A series of 3D numerical simulations are performed and compared with the results of hole-expansion tests. The effects of pre-damage field and fracture models are analyzed and discussed.
KeywordsEdge fracture Ductile fracture Uncoupled model Finite element simulation Hole-expansion test
Financial support from China Scholarship Council (No. 201506460060) is gratefully acknowledged. Thanks are also extended to Dr. Zhiqiang Sheng at University of Michigan, Professor Taylan Altan and Professor Farhang Pourboghrat at The Ohio State University for their helpful discussions.
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