New developments in multiscale formulations for material failure

S. TORO; P.J. SÁNCHEZ; P.J. BLANCO; J.M. PODESTÁ; E. SOUZA NETO; A.E. HUESPE; R. FEIJÓO

Eindhoven

Congreso; Euromech 559 "Multi-scale computational methods for bridging scales in materials and structures"; 2015

Eindhoven University of Technology

This contribution presents a two-scale (macro-micro) formulation addressed to simulate fracture in materials having heterogeneous micro-structures. The methodology adopted by this formulation can be categorized as a semi-concurrent model which uses the Representative Volume Element (RVE) concept. The computational aspects and numerical implementation of the formulation are also shown. The mechanical model which takes into account the fracture phenomenon, assumes cohesive cracks at both scales of analysis. Initiation and posterior propagation of cohesive micro-cracks leads to material instability at the macro-scale. Once detected instability at the macro-scale, a cohesive surface is activated, and the cohesive tractions are obtained by a convenient homogenization procedure drawn from the evolution of the fracturing process at the micro-scale.