Assumed strain nodally integrated hexahedral finite element formulation for elastoplastic applications |
| |
Authors: | E Artioli G Castellazzi P Krysl |
| |
Affiliation: | 1. University of Rome Tor Vergata, , 00133 Rome, Italy;2. University of Bologna, , 40136 Bologna, Italy;3. University of California, , La Jolla, CA, 92093‐0085 USA |
| |
Abstract: | In this work, a linear hexahedral element based on an assumed strain finite element technique is presented for the solution of plasticity problems. The element stems from the Nodally Integrated Continuum Element (NICE) formulation and its extensions. Assumed gradient operators are derived via nodal integration from the kinematic‐weighted residual; the degrees of freedom are only the displacements at the nodes. The adopted constitutive model is the classical associative von Mises plasticity model with isotropic and kinematic hardening; in particular, a double‐step midpoint integration algorithm is adopted for the integration and solution of the relevant nonlinear evolution equations. Efficiency of the proposed method is assessed through simple benchmark problems and comparison with reference solutions. Copyright © 2014 John Wiley & Sons, Ltd. |
| |
Keywords: | assumed strain gradient NICE formulation nodal integration von Mises plasticity midpoint integration algorithm |
|
|