Abstract
The present work is aimed at characterizing the crack-growth behavior of hybrid composites having two different stacking sequences, namely; [C% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C] and [R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/R]. The letter C in these hybrids represents a 50% weight fraction continuous fiber composite layer while the R represents a 50% weight fraction randomly oriented chopped fiber composite layer. The standard compact tension specimens having notches oriented along and perpendicular to the fiber direction of the C layers were chosen. The flexural strength is purported to be an adequate parameter for crack-growth characterization in the cases where the observed crack-growth was in the direction perpendicular to the notch direction. For the cases of self-similar crack-growth, the measured fracture resistance was found to be lower than that predicted by a proposed rule-of-mixture relationship based upon the crack-energy release rates of the C layers and R layers.
Résumé
Le but de ce travail est de caractériser le comportement à la croissance de la fissure de composites hydrides constitués de deux séquences d'empilement différentes, à savoir C% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaaiaaigdadaWcba% WcbaGaaGymaaqaaiaaikdaaaaaaa!39AA!\[1\tfrac{1}{2}\]R/C et R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0dh9WrFfpC0xh9vqqj-hEeeu0xXdbba9frFj0-OqFf% ea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs0dXdbPYxe9vr0-vr% 0-vqpWqaaeaabaGaaiaacaqabeaadaqaaqaaaOqaamaaleaaleaaca% aIXaaabaGaaGOmaaaaaaa!38EF!\[\tfrac{1}{2}\]R/C/R. La lettre C de ce composite hybride représente une couche comportant 50% en poids de fibres composites continues et R représente une couche de fibres composites comportant 50% en poids de fibres fractionnées et réparties au hasard. On a choisi des éprouvettes de traction compactes présentant des entailles orientées soit parallèlement soit perpendiculairement à la direction des fibres des couches C. Dans les cas où l'on a observé une croissance de fissure dans une direction perpendiculaire à la direction de l'entaille, on a constaté que la résistance à la flexion était un paramètre adéquat pour caractériser cette croissance de fissure. Dans certains cas de croissance de la fissure, on a constaté que la résistance à la rupture était inférieure aux prédictions lorsque celles-ci étaient établies sur une proposition de règle de mélange, basée sur les taux de relaxation d'énergie de fissuration dans les couches C et dans les couches R.
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Chaturvedi, S.K., Sun, C.T. Crack-growth resistance of laminated hybrid SMC composites. Int J Fract 24, 179–188 (1984). https://doi.org/10.1007/BF00032681
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DOI: https://doi.org/10.1007/BF00032681