DMESH CRACK CRACK

DMESH CRACK CRACK

The first mode of damage is usually intralaminar cracking with the crack plane transverse to the laminate middle-plane, spanning the whole width of the specimen.

KEY WORDS: homogenization, intralaminar cracks, laminate stiffness.ĬOMPOSITE LAMINATES UNDER service loading undergo complex combinations of thermal and mechanical loading, leading to microdamage accumulation in the plies. Experimental data and comparison with other models are used for further verification. The methodology is validated and the possible error introduced by the noninteractive crack assumption is estimated by comparing with the 3-D FEM solution for a cross-ply laminate with two orthogonal systems of ply cracks. The strong dependence of the COD on the relative stiffness and thickness of the surrounding layers, found in this study, is described by a power law. They are determined in this paper using generalized plain strain FEM analysis results for noninteractive cracks. It is shown that the crack opening displacement (COD) and crack face sliding displacement, normalized with respect to a load variable, are important parameters in these expressions influencing the level of the properties degradation. In this approach, closed-form expressions, which contain thermoelastic ply properties, laminate layup, and crack density as the input information are obtained. ABSTRACT: A theoretical framework which allows determining the whole set of 2-D thermomechanical constants of a damaged laminate as a function of crack density in different layers is presented.

Dmesh crack