Yeong-Maw Hwang and Dyi-Cheng Chen
Department of Mechanical and Electro-Mechanical
National Sun Yat-Sen University
Kaohsiung, Taiwan 804, R.O.C.
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The purpose of this paper is to
explore the deformation mechanism of void generation around inclusions
inside the sheet during sheet rolling processes. The plastic deformation
and flow pattern of the sheet with inclusions inside during sheet rolling
were simulated by the rigid-plastic finite element method. The inclusions
are assumed to be rectangular or round and located at the center of the
sheet. The effects of various rolling conditions, such as the dimension
of the inclusion, the distances between two inclusions, etc., on the generation
and development of voids anticipated to occur in the front and rear of
the inclusion and mean stress distributions at the roll gap during rolling
were discussed. The critical thickness reductions under which void generation
can be avoided were also investigated. Furthermore, experiments on sheet
rolling with an inclusion inside the sheet were conducted. The theoretical
predictions of the dimensions of the voids after rolling were compared
with experimental results and relatively good agreement between them was
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