A Numerical Model for Unilateral Materials in Finite Deformations, Part II:Finite Element Implementation and Applications

The implementation of the model for unilateral no-Tension materials described in part one in a standard isoparametric nonlinear finite elements code is described and discussed. A formulation based on the tensorial components of the Cauchy-Green deformation tensor has been used. Explicit expressions for the components of the material and geometric tangent stiffness matrices and for the equivalent internal nodal forces are furnished. Special attention has been focused on the material tangent stiffness matrix, in order to obtain satisfactory convergence properties. Some examples complete the paper.