Paper number 1080

MICROMECHANICAL MODELING OF CROSS-PLY TITANIUM MATRIX COMPOSITES REINFORCED WITH SILICON-CARBIDE FIBRES

Z. Xia, F. Ellyin and Y. Chen

Department of Mechanical Engineering, University of Alberta
Edmonton, Alberta, Canada, T6G 2G8

Summary

A three-dimensional, double-layer unit cell model is used to predict the overall stress/strain behaviour and damage of a [0/90]ns SCS-6 fibre/titanium matrix cross-ply laminate. The titanium matrix is represented by a rate-dependent elastic-plastic constitutive model, recently developed, which has been incorporated into finite element code ADINA, as user-defined material model. A criterion of the initiation of damage and post-damage constitutive relation is introduced for the interfacial elements between the fiber and matrix. The finite element analysis results are compared with the experimental data, and it is found that the model prediction of the rate-dependent stress-strain response is in good agreement with the experiment data. The success of the micromechanical analysis can be attributed to the accurate representation of the matrix property by the constitutive model and the correct simulation of the damage mechanism.

Keywords

micromechanics, fibre-reinforced composites, constitutive model, finite element analysis, interfacial damage, titanium matrix.