Calculations of forming limit diagrams for changing strain paths on the formability of sheet metal

In the press shop of most sheet metals, sheet material undergoes complex st rain path and also the formability of the sheet material was limited by the stretchability of the material. Therefore, the precise prediction of path- dependent FLD based on M-K approach using generalization of Hill's 1979 ani sotropic yield criterion and introducing a strain gradient effect in the co nstitutive equation. Also, the theoretically obtained FLD will be compared with experimental data for steel sheets.