QUASI-STATIC IMPLICIT AND TRANSIENT EXPLICIT ANALYSES OF SHEET-METAL FORMING USING A C-O 3-NODE SHELL ELEMENT

A three-node isoparametric shell element well suited for extensive non -linear analyses is developed and used for the simulation of sheet-met al forming processes. Two computational strategies based on this eleme nt are presented: a quasi-static implicit one based on an updated lagr angien formulation with a consistent tangent stiffness matrix and a tr ansient explicit one where the diagonal mass matrix is used to compute the nodal acceleration vector. The anisotropic elastic-plastic consti tutive equations are treated using a rotated frame subjected to follow the anisotropy axes. Two numerical examples are presented and the two computational strategies are compared.