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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 5/2-3-4 - 2002  - pp.237-246  - doi:10.3166/ijfp.5.237-246
TITLE
Analysis and Experiment on Void Closure Behavior inside the Sheet during Sheet Rolling Processes

ABSTRACT
The purpose of this paper was to explore the deformation mechanism of voids and stress-strain distributions around an internal void inside the sheet during sheet rolling processes. The plastic deformation and flow pattern of sheets during sheet rolling were simulated by the finite element method. The influences of various rolling conditions, such as the thickness reduction, the dimension of the internal void, etc., on the dimension of the void at the exit were discussed. The critical thickness reductions, over which the void would close completely, were also investigated. Furthermore, experiments on sheet rolling with an internal void inside the sheet were conducted. Theoretical predictions of the dimension of voids after rolling were compared with experimental results and relatively good agreement between them was found. Clearly, these analytical results can provide useful knowledge for designing the pass-schedule of sheet rolling processes for eliminating internal voids.


AUTEUR(S)
Dyi-Cheng CHEN, Yeong-Maw HWANG

KEYWORDS
Finite element method, internal void, critical thickness reduction, sheet rolling.

LANGUE DE L'ARTICLE
Anglais

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