EXPLICIT DYNAMIC ANALYSIS OF ELASTOPLASTIC LAMINATED COMPOSITE SHELLS- IMPLEMENTATION OF NONITERATIVE STRESS UPDATE SCHEMES FOR THE HOFFMAN YIELD CRITERION

The dynamic analysis of composite shell structures is carried out by a n explicit finite element code employing 4-node one-point quadrature e lements. The anisotropic Hoffman yield criterion is adopted to model t he laminates. The formulation for stress update using a backward Euler scheme is presented in the plane stress subspace. Several numerical e xamples are presented. The issue of implementing single-iteration sche mes for stress update is also investigated.