INVESTIGADORES
HUESPE Alfredo Edmundo
congresos y reuniones científicas
Título:
Two-Scale Modeling of Material Failure Based on the Continuum Strong Discontinuity Approach
Autor/es:
J. OLIVER,; A E. HUESPE; J. HERNÁNDEZ; M. CAICEDO
Lugar:
Praga
Reunión:
Congreso; CFRAC 2013: The Third International Conference on Computational Modeling of Fracture and Failure of Materials and Structures; 2013
Institución organizadora:
ECCOMAS-IACM
Resumen:
Two-scale computational modeling of materials isa subject of increasing interest in computationalmechanics. When dealing with materials displayinga spatially smooth behaviour, there is wideconsensus on the suitable mechanical approaches tothe problem. The so called FE2 methods, based onthe hierarchical, bottom-up one-way coupled,description of the material using the finite elementmethod in both scales, and computationalhomogenization procedures at the fine scale, isnowadays one of the most popular approaches. Atthe heart of this direct computationalhomogenization procedures lies the notion ofrepresentative volume element (RVE) defined asthe smallest possible region representative of thewhole heterogeneous medium on average. Whenmaterial failure is aimed at being captured, theproblem exhibits additional complexity. Either ifdiscrete approaches (based on non-linear softeningcohesive models), or continuum approaches (strainlocalization-based or regularized models) are used,at the fine scale, to model material failure, thekinematic description of some, or both, scales canno longer be considered smooth, and the existenceof the RVE becomes questionable on the groundsthat, in this case, the material loses the statisticalhomogeneity inherent to the RVE concept. Acrucial consequence of this is the lack ofobjectivity of the results with respect to the size ofthe RVE. In [1] a recent attempt to overcome thisflaw, for regularized non-local models, can befound.