DAMAGE DEVELOPMENT IN EPOXY RESINS BY MEANS OF COHESIVE ZONE ELEMENTS AND ANISOTROPIC DAMAGE

摘要

The mechanical material behaviour of fibre reinforced plastics depends on the strain rate the material is subjected to. This strain rate dependency is governed by the matrix material of the composite. In this work, a numerical model based on the Goldberg model, extended through an iso- and anisotropic damage model is used and is extended by cohesive zone elements (CZM) to capture the influence of interfacial properties. The material strain rate dependency is accomplished by a direct influence on the elastic modulus, the inelastic strain, and the material strain to failure. Furthermore, a strain rate dependent definition for the epoxy's damage development is considered. Numerical investigations are carried out using a micro model under tension loading. The damage onset based on different interfacial material properties while using an anisotropic damage model is compared and discussed against an isotropic damage model at different strain rates.