Improved contact algorithms for implicit FE simulation of sheet forming
SCIE
SCOPUS
- Title
- Improved contact algorithms for implicit FE simulation of sheet forming
- Authors
- Zhuang, S; Lee, M.G; Keum, Y.T; Wagoner, R.H.
- Date Issued
- 2007-06
- Publisher
- American Institute of Physics
- Abstract
- Implicit finite element simulations of sheet forming processes do not always converge, particularly for complex tool geometries and rapidly changing contact. The SEEET-3 program exhibits remarkable stability and strong convergence by use of its special N-CFS algorithm and a sheet normal defmed by the mesh, but these features alone do not always guarantee convergence and accuracy. An improved contact capability within the N-CFS algorithm is formulated taking into account sheet thickness within the framework of shell elements. Two imaginary surfaces offset from the mid-plane of shell elements are implemented along the mesh normal direction. An efficient contact searching algorithm based on the mesh-patch tool description is formulated along the mesh normal direction. The contact search includes a general global searching procedure and a new local searching procedure enforcing the contact condition along the mesh normal direction. The processes of unconstrained cylindrical bending and drawing through a drawbead are simulated to verify the accuracy and convergence of the improved contact algorithm.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13138
- DOI
- 10.1063/1.2740818
- ISSN
- 0094-243X
- Article Type
- Article
- Citation
- AIP Conference Proceedings, vol. 908, page. 239 - 244, 2007-06
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