In large-scale numerical simulations of sheet metal-forming processes there is a need for assessing wrinkle formation tendencies at early stages of the computations. An algorithmic procedure for early prediction of wrinkles is presented, that makes use of the continuum mechanical behaviour of elastoplastic structures near buckling. The procedure has been implemented into an explicit finite element code and the performance is demonstrated on some example problems.
We consider methods for adaptive updating of computational meshes during incremental loading of non-linear shell and solid structures. In particular, we focus on updating methods where the initial topology of the mesh is maintained. The movement of the mesh (the convective step) is decoupled from the Lagrangian solution step and is done by using separately computed displacement fields, obtained by solving auxiliary thermoelastic problems. The properties of this mesh-updating procedure are investigated and demonstrated on several examples.
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