Journal
COMPOSITE STRUCTURES
Volume 258, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.113175
Keywords
Delamination growth; Durability and damage tolerance; Scatter; Hartman-Schijve equation; Normalisation
Categories
Funding
- Office of Naval Research (ONR) through the Naval Research Laboratory's core fund
- Office of Naval Research (ONR) NICOP Grant [N62909-19-1-2011-P00001]
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This paper discusses two approaches for accounting for data scatter in delamination growth tests under cyclic-fatigue loading, proposing an alternative normalization method to reduce scatter in the near-threshold region. The alternative normalization approach is more conservative than the Hartman-Schijve method.
This paper discusses two approaches that have been proposed to account for the data scatter observed in delamination growth tests under cyclic-fatigue loading and thereby enable an estimate of a worst-case delamination growth curve for use in the damage tolerance and durability assessment of composite and adhesively-bonded airframes. The two approaches discussed are: (a) the normalisation approach, whereby the energy release rate is divided by the resistance to delamination growth, G(R)(a), and (b) the Hartman-Schijve approach to delamination growth. It is shown that for the cases considered this normalisation approach can be used to yield curves that are similar to the 'mean-3 sigma', worst-case, i.e. upper-bound, curve obtained using the Hartman-Schijve equation. However, despite the reduction in the scatter that arises if this particular normalisation approach is adopted, there is still considerable scatter in the important near-threshold region. In this region the normalised curves are bounded above by the 'mean-3 sigma' curve obtained using the Hartman-Schijve equation. To address this issue, an alternative normalisation approach is then proposed. This alternative normalisation approach has the advantage of having reduced scatter in the near-threshold region but elsewhere is significantly more conservative than the Hartman-Schijve approach.
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