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|Title: ||Adaptive RKPM for Fragment-Impact Problems|
|Authors: ||P.C. Guan;S.W. Chi;J.S. Chen;T.R. Slawson;M.J. Roth|
|Contributors: ||NTOU:Department of Systems Engineering and Naval Architecture|
|Issue Date: ||2012-06-15T07:38:02Z
|Publisher: ||11th US National Congress on Computational Mechanics|
|Abstract: ||abstract:An adaptive semi-Lagrangian reproducing kernel particle method (RKPM) is proposed for modeling of fragment-impact problems. The adaptive semi-Lagrangian reproducing kernel formulation is introduced to achieve simultaneous computational efficiency and accuracy. Under the semi-Lagrangian reproducing kernel formulation [1,2], the kernel functions are reevaluated using distance measure in the deformed configuration to allow the particle neighbor and shape functions to be redefined during the deformation or adaptive process. We consider both intrinsic and extrinsic p- refinements and h- refinement for path dependent problems. Issues to be addressed in RKPM based adaptive refinement include ill-conditioning in the moment matrix, numerical wave reflections, update of state-field in path-dependent material models and contact problems, and regularization of mesh dependent solution in strain localizations. The proposed adaptive RKPM method is applied to several fragment-Impact problems.|
|Appears in Collections:||[系統工程暨造船學系] 演講及研討會|
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