선택적 M/S요소를 이용한 2차원 스트레칭 공정의 탄소성 유한요소해석

Abstract

The study is concerned with two-dimensional elastic-plastic finite element analysis of stretch forming by using the selective-membrane/shell elements. The membrane analysis is frequently used due to the short computational time. However, in the membrane analysis the bending effects can not be considered at all. On the other hand, the shell analysis allows the consideration of bending effects, but involves too much computational time. As a practical compromise between two kinds of analyses, selective-membrane/shell analysis is proposed which combines the shell elements for the local region where the bending effect should be considered and the membrane elements for the rest of the computational region where the bending effect can be safely neglected. Two-dimensional stretch forming is analyzed by the conventional membrane analysis, by the shell analysis employing the degenerated shell elements and by the proposed selective-membrane/ shell analysis. The selective-membrane/shell analysis is shown to be in good agreement with the shell analysis with less than half of the computational time consumed by the full shell analysis.