Compressive failure of composites: A computational homogenization approach

Saeid Nezamabadi (1, 2) , Michel Potier-Ferry (3) , Hamid Zahrouni (4) , Julien Yvonnet (5)

1 LMGC - Laboratoire de Mécanique et Génie Civil
2 PMMD - Physique et Mécanique des Milieux Divisés
3 LPMM - Laboratoire de physique et mécanique des matériaux
4 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
5 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

This paper revisits the modeling of compressive failure of long fiber composite materials by considering a multiscale finite element approach. It is well known that this failure follows from a fiber microbuckling phenomenon. Fiber microbuckling is governed by both material and geometrical quantities: the elastoplastic shear behavior of the matrix and the fiber misalignment. Although all these parameters are easily accounted by a finite element analysis at the local level, the failure is also influenced by macrostructural quantities. That is why a multilevel finite element model (FE²) is relevant to describe the compressive failure of composite. Furthermore, fiber local buckling leads to a loss of ellipticity of the macroscopic model, which can be a criterion of failure.

Mots clés: Asymptotic numerical method; Nonlinear homogenization; Multiscale finite element method; Long fiber composite; Microbuckling; Loss of ellipticity

Domaines: Matériaux et structures en mécanique [physics.class-ph]; Mécanique des solides [physics.class-ph]

Saeid Nezamabadi, Michel Potier-Ferry, Hamid Zahrouni, Julien Yvonnet. Compressive failure of composites: A computational homogenization approach. Composite Structures, 2015, 127, pp.60-68. ⟨10.1016/j.compstruct.2015.02.042⟩. ⟨hal-01134132⟩