Molecular dynamics based cohesive zone law for describing Al–SiC interface mechanics

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Molecular dynamics simulations are carried out to parameterize and obtain a traction–separation law for a ductile–brittle interface in tensile and shear loadings at high temperatures. Traditionally the interface is characterized by a cohesive zone model (CZM) with the traction–separation law assumed or parameterized through experiments. The experimental determination of the shape of the CZM has proved to be difficult. In this study a traction–separation law is thus obtained for an aluminum–silicon carbide composite system by conducting molecular dynamics simulations. The generated parameterized traction–separation law is then input into a finite element model to predict the stress–strain response of the metal matrix composite under high strain rate loading and compared with experimental results.