Eigendeformation-Based Homogenization of Concrete

A two-scale approach based on eigendeformation-based homogenization is explored to predict the behavior of concrete targets subjected to impact loading by high speed projectiles. The method allows to account for micromechanical features of concrete at a computational cost comparable to single scale phenomenological models of concrete. The inelastic behavior of concrete is modeled using three types of eigenstrains. The eigenstrains in the mortar phase include pore compaction (or lock-in), rate-dependent damage and plasticity eigenstrains, whereas the inelastic behavior of aggregates is assumed to be governed by plasticity only. Material parameters were identified using inverse methods against unconfined compression and uniaxial compression tests. A unit cell was constructed from 3D digital image of concrete. The eigendeformation-based homogenization approach was validated for the projectile penetration into concrete target. The simulation results were found to be in reasonable agreement with the experimental data. Attention is restricted to non-reinforced concrete. 1 Email: [email protected]