A homogenized approach for delamination fracture in laminated structures

Abstract eng:
Progressive damage in multi-layered structures is dominated by delamination fracture at the layer interfaces. Current modeling relies on cumbersome and computationally expensive discrete-layer models which represent the structures as an assembly of layers joined by cohesive interfaces and where the number of variables depend on the number of layers and may be very large. In this paper, fracture of laminated plates will be studied using a novel multi-scale homogenized model which has been recently formulated by the author. The model depends on a limited number of global variables, equal to those of classical single layer theories, and account for the small-scale fields, e.g. zig- zag displacements, jumps at the layer interfaces, through a homogenization technique. The model accurately predicts stresses and displacements in multi-layered plates with continuous imperfect interfaces and delaminations subjected to thermo-mechanical loading. Here the accuracy of the approach in deriving fracture parameters will be verified using some simple reference problems.

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