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The analysis of the three-dimensional tension in multilayer plates from composite materials near to holes

In the complete strength analysis of elements of multilayer constructions with constructive excisions, it is necessary to take into account the presence of interlaminar stress in an environment of the excisions stipulated by a three-dimensional tension of this zone. The interlaminar stress of a construction can reduce by stratification at loadings. It has a significant smaller limit, corresponding to destruction in a plane of separate stratums, and should be taken into account at projection. In the present operation for an estimation of interlaminar stress in plates with curvilinear nonloaded holes the numerical-analytical method [Olegin, IP (1999)], free from the above described limitations is used. The method allows to examine in details a three-dimensional tension near to the crimps of holes irrespective of sizes of a plate, and also to define sizes of the boundary layer.