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It is often desired to incorporate embedded functional components into the design of engineering structures.This is especially the case in e.g.aerospace and aeronautical engineering and automotive engineering,where the installation space is tight.To achieve good performance,one can adopt the technique of integrated topology optimization of multi-component structures[1-3],which simultaneously designs the layout of embedded components with fixed shapes and the distribution of host material.In previous researches on this issue,interface behavior is seldom considered.