Abstract
From considerations of the pull-out behaviour of individual inclined wires from model composites, the work of fracture and post-cracking stress of random fibre reinforced composites have been estimated. Results are presented for cement composites reinforced with short, high-strength steel wires. It was found that when the fibres were short and/or the interfacial shear stress low, a substantial part of the composite work of fracture was due to plastic deformation of those fibres which were not perpendicular to the matrix crack face. Under such conditions random fibre composites showed superior properties than aligned composites of the same volume fraction of reinforcement.
Résumé
On a évalué le travail de rupture et la contrainte après fissuration de matériaux renforcés de fibres à répartition aléatoire à partir de l'étude de modèles de composites dans lesquels on a considéré le comportement à l'arrachement de filaments individuels inclinés. Les résultats donnés ici se rapportent à des composites à base de ciment renforcé avec de courts filaments d'acier de haute résistance. On constate que lorsque les fibres sont courtes et/ou la contrainte de cisaillement à l'interface faible, une part substantielle du travail de rupture est due à la déformation plastique des fibres qui ne sont pas perpendiculaires à la surface fissurée. Dans de telles conditions, les composites à fibres réparties au hasard montrent des proprietés meilleures que les composites à fibres alignées pour le même rapport de volume de renforcement.
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Morton, J. The work of fracture of random fibre reinforced cement. Mat. Constr. 12, 393–396 (1979). https://doi.org/10.1007/BF02478816
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DOI: https://doi.org/10.1007/BF02478816