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Title: Delamination in adhesively bonded CFRP joints : standard fatigue, impact-fatigue and intermittent impact
Authors: Casas-Rodriguez, Juan P.
Ashcroft, Ian A.
Silberschmidt, Vadim V.
Keywords: Adhesive joints
Carbon fibre
Fatigue
Impact behaviour
Damage tolerance
Issue Date: 2008
Publisher: © Elsevier
Citation: CASAS-RODRIGUEZ, J.P., ASHCROFT, I.A. and SILBERSCHMIDT, V.V., 2008. Delamination in adhesively bonded CFRP joints : standard fatigue, impact-fatigue and intermittent impact. Composites Science and Technology, 68 (12), pp. 2401-2409 [doi:10.1016/j.compscitech.2007.11.006]
Abstract: The response of adhesive joints to three fatigue regimes, namely; constant amplitude sinusoidal loading (standard fatigue, SF), cyclic in-plane impacts (impact fatigue, IF) and a combination of the two (CSIF), has been investigated. The samples used in this study were carbon fibre reinforced polymer (CFRP) lap-strap joints (LSJs) bonded with a rubber modified epoxy adhesive. It was observed that fatigue fracture at very low load amplitudes occurred in IF. Two main patterns of failure were observed in SF; cohesive failure in the adhesive, which was linked to slow fatigue crack growth behaviour, and a mixed-mode failure, involving failure in both the adhesive and the CFRP. In addition, it was observed that the transition from cohesive to mixed mode failure was accompanied by crack growth acceleration. In IF it was seen that all failure was of a mixed-mechanism nature. In the combined standard and impact fatigue it was seen that the introduction of a relatively small number of impacts between SF blocks drastically changed the dynamics of fatigue crack propagation, increasing the crack rate. A further observation was that cavitation of rubber particles in the adhesive, which is seen as evidence of active toughening, was affected by the addition of impact loading.
Description: This is a journal article. It was published in the journal, Composites and Science Technology [© Elsevier] and the definitive version is available at: http://www.sciencedirect.com/science/journal/02663538
URI: https://dspace.lboro.ac.uk/2134/3749
ISSN: 0266-3538
Appears in Collections:Published Articles (Mechanical and Manufacturing Engineering)

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