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Impact fatigue in adhesive joints

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journal contribution
posted on 22.10.2008, 08:02 authored by Vadim SilberschmidtVadim Silberschmidt, Juan P. Casas-Rodriguez, Ian A. Ashcroft
One of the forms of a vibro-impact effect in engineering components is impact fatigue (IF) caused by a cyclic repetition of low energy, low-velocity impacts, for instance, in aerospace structures. It can have a highly detrimental impact on performance and reliability of such components, exacerbated by the fact that in many cases it is disguised in loading histories by non-impact loading cycles with higher amplitudes. Since the latter are traditionally considered as most dangerous in standard fatigue, IF has not yet received deserved attention; it is less studied and practically unknown to specialists in structural integrity. Though there is a broad understanding of the danger of high-energy single impacts, repetitive impacting of components has been predominantly studied for very short series. This paper aims at the analysis of IF of adhesively bonded joints, which are becoming more broadly used in aerospace applications. The study is implemented for two types of typical adherends – an aluminium alloy and a carbon-fibre reinforced composite – and an industry-relevant epoxy adhesive. Various stages of fatigue crack development in adhesively bonded joints are studied for the conditions of standard and IF. The results obtained – in terms of crack growth rates, fatigue lives, and microstructures of fracture surfaces – are compared for the two regimes in order to find similarities and specific features.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

SILBERSCHMIDT, V.V., CASAS-RODRIGUEZ, J.P. and ASHCROFT, I.A., 2008. Impact fatigue in adhesive joints. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222 (10), pp. 1981-1994 [DOI:10.1243/09544062JMES924]

Publisher

© IMechE / Professional Engineering Publishing

Publication date

2008

Notes

This article was published in the journal, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science [© IMechE] and is also available athttp://journals.pepublishing.com/content/119771

ISSN

0954-4062

Language

en