Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 69, Issue 14, Pages 2421-2427Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2009.06.010
Keywords
Polymer-matrix composites (PMCs); Plastic deformation; Finite Element Analysis (FEA); Modelling; Stress Concentration; Probabilistic methods; Statistics; Damage mechanics
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A Monte Carlo simulation is established to predict the failure strain of unidirectional fibre composites. The effect of matrix shear yielding of a high performance epoxy resin is introduced into the model through load sharing factors between the fibres adjacent to fibre-break(s). Strain concentration factors (SCF) of fibres are obtained using Finite Element Methods (FEM) in a three dimensional multi-fibre unit cell containing one, two and three adjoining fibre-break(s). The tensile strains of the surviving adjacent fibres are intensified as a function of their distances from the fracture. A statistical simulation is carried out to predict the failure strain of a single layer of unidirectional (UD) fibre composites with the thickness of the fibre ineffective length. Using the weakest link theory, the ultimate failure strain of a real size UD composite is predicted. (C) 2009 Elsevier Ltd. All rights reserved.
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