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Hybrid Method for Updating Geometry 3n Non-steady State Metal Forming Analysis by Rigid Plastic FEM  

최영 (인제대학교 기계자동차공학부)
여홍태 (동의대학교 기계공학부)
허관도 (동의대학교 기계공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.11, 2004 , pp. 155-162 More about this Journal
Abstract
The volume of the metal is not changed for the plastic deformation. For metal forming simulation, rigid-plastic FEM codes are widely used. Updating geometry using Euler method in the simulation, the volume loss is occurred. In this paper, hybrid method is introduced to perform a more accurate simulation reducing computation time. In the proposed hybrid method, RK2 method is used for geometry updating at first time step and after the boundary condition of the node is changed. At the others, Adams-Bashforth or theta method is applied to update geometry. The results show that the simulations of upsetting and side-pressing can be performed within 0.02％.
Keywords
Geometry update; Rigid plastic FEM; RX2 method; Taylor method of order two; Multi-step method; Theta method; Hybrid method;
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