Simulation on the Tensile Behaviour and the Initiation of Fracture Voids for the Composite

Abstract

For the composites, the strength and the site of crack nucleation are determined by a combination of mechanical and physico-chemical factors. The former provides the required stress concentrations and local plastic deformation, while the latter is represented by the strength of inclusion, interface and matrix, respectively. So, this problem may be solved by investigating the strength and mechanical properties of each alloy element and by calculating the stress distribution in plastic deformation. But the micromechanical calculations during plastic deformation were solved by the finite element method, that has been applied to the fracture mechanics. On the assumptions of the three different crack initiation modes, two-phase model alloys which were the Al matrix with Si, the Al matrix with Cu and the Cu matrix with Fe, were prepared by the hot-press method and the tensile behaviour was observed. On the other hand, the elastic-plastic finite element simulation was used for the micromechanical stress and strain calculations of these composite models in tension.
There was good agreement in the load and the site of initiation of fracture voids between the results calculated from the simulation and experimental data on Si/Al, Cu/Al and Fe/Cu composite alloys. And the available results were computed for the initiation of ductile fracture voids.