INVESTIGADORES
HUESPE Alfredo Edmundo
congresos y reuniones científicas
Título:
New developments in multiscale formulations for material failure
Autor/es:
S. TORO; P.J. SÁNCHEZ; P.J. BLANCO; J.M. PODESTÁ; E. SOUZA NETO; A.E. HUESPE; R. FEIJÓO
Lugar:
Eindhoven
Reunión:
Simposio; Colloquium 559 Multi-scale computational methods for bridging scales in materials and structures 23 February ? 25 February 2015; 2015
Institución organizadora:
European Mechancis Society
Resumen:
This contribution presents a two-scale (macro-micro) formulation addressed to simulate fracture inmaterials having heterogeneous micro-structures. The methodology adopted by this formulation can becategorized 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 atboth scales of analysis. Initiation and posterior propagation of cohesive micro-cracks leads to materialinstability 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 fromthe evolution of the fracturing process at the micro-scale.A variational multiscale formulation based on a similar methodology has previously been presented bythe authors, [1], [2], [3]. It has been shown that the procedure provides objective results with respectto the micro-cell size, even after the onset of strain localization process, observed at the macroscopicscale.