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Meeting NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
Symposium NUMISHEET 2021
Presentation Title Study on Ductile Fracture Behavior during Hole Expansion Test Using Microstructure Based Dual-scale Approach
Author(s) Siwook Park, Jinwook Jung, Byeong Seok Jeong, Sung Il Kim, Myoung-Gyu Lee, Heung Nam Han
On-Site Speaker (Planned) Siwook Park
Abstract Scope A dual-scale finite element approach was conducted to predict the Hole Expansion Ratios (HERs) of single phase and two phase steel. In macro-scale, the uniaxial tensile test and hole expansion simulation were performed. The strain history obtained from macroscale simulation was used as a boundary condition of micro-scale Representative Volume Element (RVE) model. Mechanical properties of constituent phases were measured from nanoindentation tests and the microscale parameters of dislocation based continuum model were optimized using stress strain behaviors obtained from macroscale nanoindentation simulations. The equilibrium dislocation density was found by enforcing condition, which the Peach-Kohler force vanish during the pile-up of dislocations. The strain developed in the microstructure during plastic deformation calculated by simulation was compared with experimentally measured data such as Kernel Average Misorientation (KAM). For the failure modeling, microstructure-based finite element approach was conducted. The experimentally observed hole-expansion formability was well explained by using the presented dual-scale model.
Proceedings Inclusion? Definite: At-meeting proceedings

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