ASSESSMENT OF FAILURE UNDER LONGITUDINAL COMPRESSION OF UNIDIRECTIONAL COMPOSITES WITH IN-PLANE FIBER MISALIGNMENT

Abstract

© (2022) by International Council of Aeronautical Sciences (ICAS) All rights reserved.This work employs a micromechanical theory and kinematic relationships to describe the displacement field in individual unidirectional composite plies. The technique relies on an incremental approach where the misalignment angle of fibers is the main variable in the analysis. Upon convergence at a certain loading level, stresses and strains are evaluated in the fibers and matrix using micromechanics, and a specific failure criterion is applied. The Ramberg-Osgood relations are used to correct degraded mechanical properties of the resin in the nonlinear regime. The Hashin-Rotem failure criterion and experimental data obtained in the literature are used to validate the technique. It is observed that the numerical and experimental results obtained correlate well.

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