Accurate material models and prediction of forming limits on high performance difficult-to-form sheet metals for cold and hot forming CAE

点击翻译按钮获取中文摘要

Elasto-viscoplastic material behaviors of several types of sheet metals, such as high strength steel, stainless steel, aluminum, magnesium and titanium sheets, at various temperatures were experimentally investigated. Based on the experimental observations, macro constitutive models for these metals were proposed and they have been installed into CAE code LS-DYNA. Meso-plasticity models based on the crystal plasticity theory were also proposed to discuss the effect of the texture on the anisotropy of sheet metals. Furthermore, forming limits under stretch forming, stretch bending and hole expansion were investigated, and new criteria of forming limits were newly proposed. The validity of the proposed material models and the forming limit criteria have been verified by performing sheet metal forming simulations.