An improved looping method for quadrilateral finite element generation, effective especially for automatic metal forming simulation, was presented in this paper. A new splitting criterion to improve the conventional looping method, an artificial boundary scheme to reduce mesh transition regions and an optimal nodal placement scheme to enhance local and global mesh quality were introduced in the standpoint of metal forming engineering. Various application examples were given, which show versatility and applicability of the presented approaches and the developed mesh generator. Application examples including automatic computer simulation of a forging process showed that the presented approaches are powerful for metal forming simulation.
SUMMARYIn this paper, a general approach to automatic generation of quadrilaterals on three-dimensional surfaces is presented. The approach is based on the mapping method for surface meshing and the looping method for generation of quadrilaterals on the mapped plane. Several schemes including a coedge treatment scheme, an allowable tolerance and distance scheme, a multipatch treatment scheme with new mapping functions and a remapping scheme are proposed. Several realistic application examples are given, which show the generality of the presented approach. #
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