Abstract
• Stiffness comparison between an FGM and equivalent monolithic composite was done. • Elastic constants were measured using ultrasound phase spectroscopy. • Despite the gradient structure, the FGM displays quasi-isotropic elastic properties. • Stiffness depends only on the ceramic content, gradient structure has no influence. • Hashin Shtrikman lower bound provides the best fit for the stiffness of the FGM. The aim of this work is to compare the stiffness of a graded composite and equivalent monolithic particulate reinforced composite experimentally. Hybrid Al-SiC-graphite composites were fabricated using spark plasma sintering. Longitudinal elastic constants were measured using non-destructive ultrasound phase spectroscopy. It is seen that for the graded composites, the stiffness depends solely on the reinforcement content, while the gradient structure has no influence. Comparison with analytical micromechanical models show that the Hashin Shtrikman lower bound predicts the elastic constants most accurately.
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