異方性薄板の角筒深絞り成形のフランジしわの解析(力学特性)  [in Japanese] Analysis of Flange Wrinkle in Square-shell Deep Drawing of Anisotropic Sheet(Mechanical Properties)  [in Japanese]

An FEM simulation utilizing a dynamic explicit code was conducted to investigate the flange wrinkle behavior of square shell deep drawing of anisotropic steel sheets. In the FEM simulation, anisotropy of the r-value is taken account of by using the Barlat-Lian '89 equation. The yield locus diagram and the influence of anisotropy were investigated by changing the combination of the R_<00>, R_<45> and R_<90> value. One quarter portion of the 75mm square punch and 80mm square die was used in the simulation and frictional coefficient μ=0 (Teflon lubricant condition) was adopted. As a result, the greater the m-value of the yield locus, the greater the yield stress (YS) and the greater the ΔCL value (R_<90>-R_<00>)/R_<ave> become, the bigger the flange wrinkle.