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Classical micromechanical methods for calculating the effective moduli of a heteroge-neous material are generalized to include the interface(surface)effect.By using Hashin’s CompositeSphere Assemblage(CSA)model,a new expression of the bulk modulus for a particle-reinforced com-posite is derived.It is emphasized that the present study is within the finite-deformation frameworksuch that the effective properties are not influenced by the interface stress itself solely,but influencedby the change of the interface stress due to changes of the shape and size of the interface.Hence someinadequacies in previous papers are pointed out.
Classical micromechanical methods for calculating the effective moduli of a heteroge-neous material are generalized to include the interface (surface) effect. By using Hashin’s CompositeSphere Assemblage (CSA) model, a new expression of the bulk modulus for a particle-reinforced com-posite is derived that the present study is within the finite-deformation frameworksuch that the effective properties are not influenced by the interface stress itself solely, but influenced by the change of the interface stress due to changes of the shape and size of the interface .ence someinadequacies in previous papers are pointed out.