期刊
MATERIALS & DESIGN
卷 155, 期 -, 页码 59-70出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.05.049
关键词
Delamination; Fatigue; Composites; Artificial neural networks
资金
- Rolls-Royce plc through the Composites University Technology Centre at the University of Bristol (UK)
This paper discusses two alternative modelling approaches for describing fatigue delamination growth (FDG) in polymer-based fibre-reinforced composites, i.e. semi-empirical equations having a power-law form and artificial neural networks. Barenblatt's self-similarity principles are applied for identifying a suitable expression of the delamination driving force in terms of the square-rooted energy-release-rate range and the associated peak values. The general dependency of pre-factors and exponents of FDG power-laws on the stress-ratio and mode-mixity is discussed in detail. Single-hidden-layer neural networks (SHLNN) with the support of self-similarity principles are here proposed as an alternative to semi-empirical power laws for describing FDG in composites. A example application of SHLNN to mixed-mode and variable stress-ratio FDG is provided for the carbon/epoxy system T800H/#3631. The SHLNN predictions are compared to a semi-empirical fit based on a modified Hartman-Schijve power-law. (C) 2018 Elsevier Ltd. All rights reserved.
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