Abstract
A theoretical analysis of the instability arising from interface debonding in a composite containing coated inclusions subject to remote hydrostatic tensile traction is presented. The composite macroscopic stress–strain relation incorporating the influence of interfacial displacement jumps is discussed in detail for our proposed spherically symmetric model. Because of the model assumptions, this relation is limited to composites with small volume fractions of the inclusion and coating. The influences of the maximum traction and bonding characteristic length at the inclusion/coating and coating/matrix interfaces on the peak stress, corresponding strain, and strain interval are fully investigated. The various interfacial parameters are found to have significant influences on the instability of the composite arising from interface decohesion at both interfaces. In particular, the bonding characteristic length for the coating/matrix interface is the most critical parameter for improving the overall bearing capacity of the composite. These results can serve as guidelines for material selection to optimize composite performance.
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