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• W1998045644 abstract "Cyclic tension-tension testing was performed on an off-axis (10°) unidirectional graphite bismaleimide (BMI) composite to determine the effect of the matrix dominant properties on the fatigue behaviour of the material. Rosette strain gauges mounted in the major directions were used to monitor cyclic stresses and strains while acetate replicas of surface cracks were taken as the number of cycles increased allowing a correlation of the stress-strain response with the accompanying cracking mechanisms to be established. Initial rapid crack nucleation and modulus degradation in the first 10% of life were followed by crack coalescence and steady state growth in the bulk material. Final fracture ensued from the development of coalesced matrix shear cracks parallel to the fibres. Comparing the amount of cracked area with modulus degradation, the decrease in shear modulus was found to be a more sensitive and practical parameter to represent fatigue damage evolution.On a effectué des essais cycliques tension-tension sur un composite excentré (10°), unidirectionnel, en graphite et bismaléimide (BMI) afin de déterminer l’effet des propriétés dominantes de la matrice sur la tenue en fatigue du matériau. On a utilisé des jauges de contraintes en rosette montées dans les directions principales pour observer les contraintes et les déformations cycliques tout en prenant des répliques en acétate des fissures de surface à mesure que le nombre de cycles augmentait, permettant d’établir une corrélation entre la réponse de contrainte-déformation et les mécanismes de fissurage qui l’accompagne. La nucléation initiale et rapide de fissure et la dégradation du module d’élasticité dans le premier 10% de vie étaient suivies par la coalescence de fissure et la croissance en régime permanent dans le matériau en vrac. La rupture finale a résulté du développement des fissures coalescées parallèles aux fibres, par cisaillement de la matrice. En comparant la superficie fissurée avec la dégradation du module d’élasticité, on a trouvé que la diminution du module de cisaillement était un paramètre plus sensible et plus pratique pour représenter l’évolution de l’endommagement par fatigue." @default.
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• W1998045644 date "2006-12-01" @default.
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• W1998045644 title "CYCLIC DAMAGE CHARACTERIZATION OF AN OFF-AXIS UNIDIRECTIONAL GRAPHITE BISMALEIMIDE COMPOSITE" @default.
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• W1998045644 doi "https://doi.org/10.1179/cmq.2006.45.4.433" @default.
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