Micro-Macro Modelling of Metallic Composites

摘要

This contribution describes a scale bridging approach for modelling pressure independent elastoplastic unidirectional metallic composite materials by making use of an anisotropic elastoplastic constitutive model. The material under investigation is tungsten fiber reinforced copper (W/Cu) composite. To identify the yield surface of the composite, a finite element model of a repeating unit cell (RUC) is set-up (micro-model). Through virtual experiments, the yield surface of the composite is identified. An anisotropic elastoplastic constitutive model based on the identified yield surface, which makes use of the concept of structural tensors, is developed. This material model serves as the material model for macro computations. To ensure a good agreement between constitutive model and RUC during plastic evolution, multiple hardening functions are employed. The parameters of the constitutive model are identified and the constitutive model is validated against the response of the RUC.