The composite materials are susceptible to interfacial delamination. The overall properties of composites will degrade dramatically if the interface between the particles and the matrix material undertakes interfacial damage. In present paper, the effects of interfacial delamination on the macro properties of composites are evaluated by the Equivalent Inclusion Method(EIM) with some modifications and supplementations on the conventional one, which was originally proposed by Eshelby. The meso-local behaviors of particle, matrix, as well as their interface are theoretically modeled, and the relationships between these behaviors and the macro stress/stress field are established. Upon modeling the damaged interface with spring layers and making equivalent of stress and strain inside a real particle to those inside the corresponding virtual inclusion, a modified Eshelby tensor and the damage-relevant tensor of the inclusions are derived explicitly. These tensors can be conveniently incorporated into the constitutive model, and make it available to assess the effects of delamination. Some numerical calculations are carried out to verify the performance of the present model.
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