Section analysis of industrial sheet-metal stamping processes

A finite element modeling program, KMAS-2D, was developed using plane-strain and axisymmetric curve element models for the section analysis of sheet forming with arbitrary draw-in and irregular tool shapes. A quasi-flow corner theory of elastic–plastic finite deformation and a normally anisotropic yield criterion are introduced. The modified Coulomb law is used to model the interfacial friction, and the tool geometry is described by the line segment scheme. The computer program was used successfully for simulation of several typical forming processes. An application is also made to an industry-scale problem with complex tool geometry. Comparisons of the calculated results with experimental data are given.