Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 70, Issue -, Pages 85-92Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2014.08.007
Keywords
Carbon/epoxy; Fibre content; Fatigue; Microstructure
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This paper investigates the effect of fibre volume fraction on the fatigue behaviour and damage mechanisms of carbon/epoxy laminates. Epoxy resin and unidirectional carbon/epoxy specimens with two different fibre volume fractions are tested under quasi-static tensile and tension-tension fatigue loads at angles of 0 degrees, 45 degrees and 90 degrees. Fracture surfaces are studied with scanning electron microscopy. The results show that stiffness and strength increase with increasing fibre volume fractions. The damage behaviour of off-axis specimens changes with increasing fibre volume content and the height of the applied cyclic load. While matrix cracking and interfacial debonding are dominating damage mechanisms in specimens with low fibre content, fibre bridging and pull out are monitored with increasing fibre content. The higher the applied load in fatigue tests transverse to fibre direction, the more similar behave specimens with different fibre volume fractions. (C) 2014 Elsevier Ltd. All rights reserved.
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