Forming Limit Diagrams are useful tools for evaluation of formability in the sheet metals. In this paper the effects of yield criteria on predictions of the right and left-hand sides of forming limit diagrams (FLDs) are investigated. In prediction of FLD, Hosford 1979, “Karafillis-Boyce” (K-B) and BBC2000 anisotropy yield functions have been applied. Whereas the prediction of FLD is based on th...

two-layer metallic sheets have wide applications in aerospace, marine, automotive and domestic industries due to their superlative characteristics. in this paper, the formability of two-layer sheet is investigated through analytical, experimental and numerical approaches. an analytical model is developed based on marciniak-kuczynski method associated hill’s non-quadratic yield criterion. formin...

The conventional theoretical forming limit diagram (FLD) based on the plane stress state has defects due to neglect of in thickness direction sheet. It is urgent study FLD which considers direction. Through finite element simulation, it further confirmed that will be induced deformation process. At same time, effect not as always applied during Based Modified Maximum Force Criterion (MMFC) inst...