Abstract
The shear constitutive response and deformation mechanisms of a quasi-isotropic [0/+45/-45/90], laminate made from TIMETAL 21 S/SCS-6 MMC were investigated using the Iosipescu test. A combination of mechanical measurement, microstructure analysis and finite element method were used to investigate the inelastic deformation mechanisms of the composite. Loading-unloading experiments provided significant insight into the nature of damage/plasticity in the quasi-isotropic MMC laminate. Shear-induced inelastic deformation is dominant due to plasticity which is associated with slip bands, and damage which includes matrix grain boundary cracks, reaction zone cracks, debonding and fiber cracks. A method of finite element analysis was developed on oriented ply-stacked quasi-isotropic laminate based on an existing inelastic constitutive model from literature. The prediction for the constitutive response using finite element analysis fits test data very well. The correlation of predicted results with experimental data shows that Iosipescu shear test is a valid method for investigating shear properties of quasi-isotropic MMC laminates which can experience complex damage modes under pure shear loading.
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