CIMEC   24726
CENTRO DE INVESTIGACION DE METODOS COMPUTACIONALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A CONTINUUM APPROACH FOR MULTISCALE PROPAGATING MATERIAL FRACTURE MODELING
Autor/es:
A E. HUESPE; J. OLIVER,; M. CAICEDO
Lugar:
Crete Island, Greece
Reunión:
Congreso; ECCOMAS Congress 2016 7th European Congress on Computational Methods in Applied Sciences and Engineering 5-10 June 2016, Crete Island, Greece; 2016
Institución organizadora:
ECCOMAS
Resumen:
ne">The work presents an approach to computational multiscale modelling of material failure (FE2), which aimsat inserting the resulting, non-smooth, homogenized constitutive model into a computational scheme formodelling the onset and propagation of material failure at the structural macro-scale. In this context, themain features of the approach are the following:1) Extends the homogenization paradigms for smooth problems ─typically the Hill-Mandel principle andthe stress/strain homogenization procedures─ to non-smooth problems, with no fundamental changes.In both scales, a continuum (stress-strain) constitutive relationship is considered, instead of the mostcommon discrete traction/separation-law, this contributing to provide a unified setting for smooth and nonsmooth problems.2) As for the multiscale modelling issue, it involves a crucial additional entity: an internal (or characteristic)length, which is point-wise obtained from the geometrical features of the failure mechanism developed atthe lower scale. As a specific feature of the presented approach, for the non-smooth case this internal lengthis exported, in addition to the homogenized stresses and the tangent constitutive operator, to the macro-scale,and considered the bandwidth of a propagating strain localization band, at that scale.3) Consistently with this internal length, a specific computational procedure, based on the crack-path-fieldand strain injection techniques, recently developed by the authors [1] is then used for modelling the onsetand propagation of this localization band, at the macro-scale.Representative simulations show that the resulting approach provides mesh objective results with respect to,both, size and bias of the upper-scale mesh, and with respect to the size of the lower-scale RVE/failure cell[2]. The continuum character of the approach confers to the formulation a minimally invasive character,with respect to standard procedures for computational one-scale homogenization and modelling ofpropagating material failure. The issue of reducing the computationalReferences