Analysis of growth of elliptic delaminations in layered structural elements

Abstract

Layered composite materials are an alternative to traditional materials for the manufacture of aviation components, details and structural elements. The delamination is a widespread destruction type of layered composite materials. The paper considered the characteristically destruction of defect growth by the example of a two-dimensional defect model of elliptic delamination type. The main stages of equilibrium parameters of Griffith's cracks are considered with account of the solution of the problem of post critical deformations. The only delamination of the elliptic form exists in the plate. The energy release rate is estimated. Generalized forces which advance delamination are determined. Generalized forces are found by numerical differentiation of the potential energy with respect to the size of the delamination with infinitesimal increments.