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http://dx.doi.org/10.3795/KSME-A.2005.29.8.1139

A Theoretical Investigation of Forming Limits of Voided Anisotropic Sheet Metals  

You Bongsun (한국기계연구원 재료연구부)
Yim Changdong (한국기계연구원 재료연구부)
Kim Youngsuk (경북대학교 기계공학부)
Won Sungyeun (경북대학교 대학원 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.8, 2005 , pp. 1139-1145 More about this Journal
Abstract
Most failures of ductile materials in metal forming processes occurred due to material damage evolution - void nucleation, growth and coalescence. In this paper, the modified yield function of Liao et al in conjunction with the Hosford's yield criterion is studied to clarify the plastic deformation characteristic of voided anisotropic sheet metals. The void growth of an anisotropic sheet under biaxial tensile loading and damage effect of void growth on forming limits of sheet metals are investigated. Also the characteristic length defining the neck geometry is introduced in M-K model to incorporate the effect of triaxial stress in necked region on forming limits. The forming limits theoretically predicted are compared with experimental data. Satisfactory agreement was obtained between the predictions and experimental data.
Keywords
Forming Limit Diagrams; M-K Theory; Material Damage; Process Length;
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