Composites A, Applied Science and Manufacturing vol:29A issue:9-10 pages:1007-1012
In this paper, results of finite element calculations of the stress state near a broken coated fibre in unidirectional carbon fibre-epoxy matrix composites are presented. For this aim, a simplified two-dimensional axisymmetric model has been developed. A part of the model contains an equivalent composite medium and, to this end, elastic constants of a coated fibre composite were separately calculated and used as input data in this analysis. The influences of coating thickness, coating stiffness and assumed crack pattern on the stresses in the broken fibre and in adjacent, unbroken fibres are evaluated, and their possible impact on composite longitudinal tensile strength is discussed. (C) 1998 Elsevier Science Ltd. All rights reserved.