Calculation of thermal residual stresses in multilayer composite materials

摘要

Determination of thermal residual stresses induced by manufacturing technology heating on the layer interfaces in multilayer composite materials has been considered. The fracture elimination condition has been proposed together with application aspects. All composite materials (CM) may be classified either by shape or size of the reinforcing component as follows: powder reinforced CMs, fiber reinforced CMs and multilayer CMs. Traditional powder reinforced CM usually contain reinforcing component uniformly distributed in the matrix. At the same time, commercial products are often subject to non-uniform both in time and space external stress of either mechanical or thermal as well as of some other origin. Therefore, the practicability of composite materials would improve in case of developing the gradient structures in them [3]. The main purpose of developing these structures is to set the non-uniformity of external loading against a material with gradient of physico-mechanical properties. Such an approach proved to be effective for obtaining optimal design solutions as reported [4] by the example of tool composites.