Mode II fatigue delamination of carbon/epoxy laminates using the end-notched flexure test

Published on Dec 15, 2015in Composite Structures5.407
· DOI :10.1016/J.COMPSTRUCT.2015.08.002
J. A. Sousa10
Estimated H-index: 10
 (University of Aveiro), António B. Pereira23
Estimated H-index: 23
 (University of Aveiro)+ 1 AuthorsA.B. de Morais26
Estimated H-index: 26
 (University of Aveiro)
Sources
Abstract
Abstract The fatigue delamination behaviour of carbon/epoxy laminates was investigated through end-notched flexure tests carried out under displacement control. Fatigue tests were conducted at different stress ratios from pre-cracks generated in initial quasi-static tests, which provided fracture toughness values. Crack propagation rates were obtained by a new approach that employed the effective crack method and considered propagation increments of small strain-energy release rate variation. The present results were found to give a more realistic view of the fatigue delamination behaviour by taking either a recently defined strain-energy release rate range or the stress intensity factor range as the main fatigue driving parameter. The analysis took into account the typical power law fits, the influence of the stress ratio and the indication of a possible fatigue threshold. Finally, quasi-static tests conducted from the fatigue pre-crack showed significantly lower initiation critical strain-energy release rates than the ones previously measured.
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References33
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Abstract The studies reported in the literature on the effect of stress ratio or mean stress on fatigue delamination growth in composites are critically reviewed in this paper. These studies are classified according to their mode of fracture. Majority of the studies lack a mechanistic approach to the delamination growth characterization and the effect of stress ratio. The researchers are divided in the use of a unified correlating parameter for the delamination growth. The mechanisms of fatigue ...
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An experimental investigation aimed at identifying the presence and onset of an asymptotic stable fracture region in the mode II fatigue delamination growth behaviour of composites is presented. The study is motivated by the possibility that experimental data sets, particularly those obtained at high R-ratios, may unknowingly contain data points within the asymptotic stable fracture region that influence its perceived log-linear behaviour and the fit of various log-linear delamination growth mod...
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