A two scale finite element approach for the fracture and damage analysis of composite materials

Kurzfassung

The presentation deals with a two scale finite element model which was developed to describe and analyse the anisotropic damage state of fibre reinforced composite materials. The thermodynamical consistent formulation is based on the standard continuum mechanics framework of finite deformations. The damage onset is measured by means of the maximum principal stress criterion of the true Cauchy stress tensor. The corresponding eigendirection is used as the crack propagation direction. The coupling of the macro scale and the micro scale is carried out by means of the UMAT utility of the commercial finite element system Abaqus. The properties of the viscous regularization, which is necessary to ensure the well posedness of the underlying boundary value problem will be highlighted before further examples show the applicability of the two scale approach.