Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics

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SIZE EFFECTS ON THE STRENGTH AND TOUGHNESS OF FIBRE–REINFORCED COMPOSITES

Pinho, S. T. ; Pimenta, S. ;

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This paper presents an analytical model for size effects on the longitudinal tensile strength of composite fibre bundles. The strength of individual fibres is modelled by a Weibull distribution, while the matrix (or fibre–matrix interface) is represented through a perfectly– plastic shear–lag model. A probabilistic analysis of the failure process in hierarchical bundles (bundles of bundles) is performed, so that a scaling law relating the strength distributions of consecutive bundle levels is derived. An efficient numerical scheme (based on asymptotic limits) is proposed, hence coupon–sized bundle strength distributions are obtained almost instantaneously. Parametric and sensitivity studies show that both fibre and matrix properties are critical for bundle strength; model predictions at different scales are validated against experimental results available in the literature.

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Palavras-chave: Size effect, Tensile strength, Hierarchical bundles, Fibre–reinforced composites,

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DOI: 10.5151/meceng-wccm2012-19865

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Como citar:

Pinho, S. T.; Pimenta, S.; "SIZE EFFECTS ON THE STRENGTH AND TOUGHNESS OF FIBRE–REINFORCED COMPOSITES", p. 4394-4413 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-19865

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