Implicit algorithms for finite deformation viscoplasticity
conference paper
An objective stress update algorithm has been proposed for the framework of additive and multiplicative (visco)plasticity. The procedure for the two approaches is implemented such that extension from a small strain finite element code to the finite strain range is straigthforward. Objectivity can be retained for any choice of the intermediate configuration. Both in additive and multiplicative viscoplasticity the additional computational cost only includes some geometrical manipulations. In small strain as well as in finite strain calculations the viscosity contributes to the length scale effect and sets the shear band thickness. Necking during thin sheet tensile tests on aluminium have been analyzed computationally.
TNO Identifier
953474
ISBN
8489925704
Source title
European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2000, 11 September 2000 through 14 September 2000
Collation
15 p.
Files
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