【6月6日9:30】Dr. Ruijie Liu：
Simulation of Multi-Crack Propagation in Ductile Media Using An Interface-Oriented Finite Element Method
【来源：AG真人 | 发布日期：2019-06-04 】
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报告题目：Simulation of Multi-Crack Propagation in Ductile Media Using An Interface-Oriented Finite Element Method
报 告 人：Ruijie Liu 副教授
Dr. Ruijie Liu is currently an associate professor in the Mechanical Department at The University of Texas at San Antonio. He graduated from Tianjin University in 1987 and obtained his Ph.D. in computational mechanics from The University of Texas at Austin in 2004. He worked as a finite element developer in ANSYS during 2005-2012 and contributed to develop many nonlinear material models such as Gurson and Cap plasticity and coupled fluid flow and geomechanics. Before joining UTSA as a faculty, he worked in BP as a computational physicist in developing parallel computer code for multiphase flow in porous rock at pore-scale with billion unknowns solved in HPC clusters. His current research is on developing computational methods for modeling failure of ductile materials, composites, and multiphysics problems.
It is challenging for standard finite element methods to achieve high-fidelity simulations on the initiation, propagation, coalescence of multiple cracks in ductile media under finite plastic deformation. For example, Cohesive Zone Method (CZM) or CZM-based Extended Finite Element Method (XFEM) is most popular in modeling crack propagation in elastic media but encounters a difficulty in simulating failure of ductile materials under plastic deformation with regard to their inconsistence in crack tip physics and instability during crack openings. This talk focuses on applying discontinuous Galerkin (DG) finite element methods to handle this challenge. By breaking continuous elements along potential crack paths, DG methods: a) provide a nature data structure for crack opening events; b) accommodate crack tip physics; and c) substantially improve the instability issue of crack openings through implementing a traction-relaxation scheme. Following the DG formulation, the talk will demonstrate a good performance of DG in simulating the structural failure of a nuclear fuel cladding with multiple hydride defects under extreme conditions.