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An experimental assessment of open-hole tension-tension fatigue behaviour of a GFRP laminate.

Broughton, W R; Gower, M R L; Lodeiro, M J; Pilkington, G D; Shaw, R M (2011) An experimental assessment of open-hole tension-tension fatigue behaviour of a GFRP laminate. Compos. A, Appl. Sci. Manuf., 42 (10). pp. 1310-1320.

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Existing models provide reasonable predictions for determining the fatigue life of composite laminates under constant amplitude conditions at various stress or R-ratios (R = smin/smax). Realistically, the stress conditions experienced by engineering structures are far more complex involving varying applied stresses, and hence a degree of conservatism is employed when using fatigue models for design purposes. The drive to improve predictive analysis is reliant on more accurate and reliable methods for monitoring and assessing material degradation and fatigue life. This paper presents the results of an experimental study carried out to evaluate the applicability of various measurement techniques including digital image correlation (DIC) for this purpose. The study focused on the open-hole tension (OHT) fatigue behaviour of a quasi-isotropic glass fibre-reinforced plastic (GFRP) laminate under constant and block amplitude loading. Constant amplitude tests were conducted at two different R-ratios and the block amplitude tests involved two or more stress levels. Longitudinal strain and stiffness, and surface temperature were monitored and used to assess damage progression and fatigue life. These parameters are shown to be interrelated and potentially suitable for predicting the fatigue performance under cyclic block loading.

Item Type: Article
Keywords: Glass Fibres, Mechanical properties, Fatigue, Analytical modelling, non-Destructive Testing
Subjects: Advanced Materials
Advanced Materials > Composites
Identification number/DOI: 10.1016/j.compositesa.2011.05.014
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5236

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