Mode I fatigue delamination growth with fibre bridging in multidirectional composite laminates

•The modified Paris relation is valid for fatigue delamination in multidirectional composites.•Most energy release in fatigue delamination is concentrated on crack front, regardless of fibre bridging.•Increased fibre bridging has negligible effect on the morphology of fatigue fracture surfaces. Fati...

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Bibliographic Details
Published in:Engineering fracture mechanics 2018-02, Vol.189, p.221-231
Main Authors: Yao, Liaojun, Sun, Yi, Guo, Licheng, Lyu, Xiuqi, Zhao, Meiying, Jia, Liyong, Alderliesten, R.C., Benedictus, R.
Format: Article
Language:English
Subjects:
Bridges
Bridging
Crack propagation
Data reduction
Delamination
Energy
Experiments
Fatigue
Fatigue failure
Fibre bridging
Fracture mechanics
Laminates
Materials fatigue
Multidirectional composite laminates
Parameter modification
Stress-strain curves
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Summary:•The modified Paris relation is valid for fatigue delamination in multidirectional composites.•Most energy release in fatigue delamination is concentrated on crack front, regardless of fibre bridging.•Increased fibre bridging has negligible effect on the morphology of fatigue fracture surfaces. Fatigue delamination in multidirectional composite laminates was experimentally investigated in present study. Both the Paris relation and a modified Paris relation (with a new similitude parameter) were employed to interpret fatigue delamination with significant fibre bridging. The results clearly demonstrated that fatigue delamination was independent of fibre bridging, if a reasonable similitude parameter was used in data reduction. As a result, a master resistance curve can be fitted to determine fatigue crack growth with different amounts of fibre bridging. The energy principles were subsequently used to provide physical interpretation on fatigue delamination. The results indicated the energy release for the same fatigue crack growth remained constant with fibre bridging. Bridging fibres in most cases just periodically stored and released strain energy under fatigue loading, but had little contribution to real energy release. The master resistance curve was finally applied to predict fatigue delamination with fibre bridging. Acceptable agreement between predictions and experiments was achieved, demonstrating the validation of the modified Paris relation in fibre-bridged fatigue delamination study.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2017.11.013