engleski

Robust simulation techniques for realistic elastoplastic shell responses

A robust and unconditionally stable computational strategy for modelling a realistic elastoplastic behaviour of shell structures is presented. A complex material model for mild steel determined by the experimental studies is embedded into the formulation. An elastoplastic tangent modulus consistent with a closest point projection return mapping algorithm, completely formulated in tensor notation, is employed. The integration algorithm is implemented into a four-noded isoparametric assumed strain finite element based on Reissner-Mindlin type shell kinematic model, which also permits the simulation of geometric nonlinear responses assuming finite rotations. The numerical example shows a quadratic rate of convergence in the global iterative procedures and numerical stability at very large load steps.

Nonlinear shell analysis; realistic elastoplastic behaviour; closest point projection algorithm; consistent elastoplastic tangent modulus.

nije evidentirano