Fatigue life evaluation of aligned plant fibre composites through S-N curves and constant-life diagrams

Shah, Darshil U. and Schubel, Peter J. and Clifford, Mike J. and Licence, Peter (2013) Fatigue life evaluation of aligned plant fibre composites through S-N curves and constant-life diagrams. Composites Science and Technology, 74. pp. 139-149. ISSN 0266-3538


There is a noticeable lack of fatigue data on plant fibre composites (PFCs) which seriously limits their prospective use in fatigue critical components. The objective of this manuscript is to provide a complete set of fatigue data on vacuum infused aligned PFCs. S-N lifetime diagrams have been constructed to investigate the effect of i) plant fibre type/quality, ii) fibre content, iii) textile architecture, and iv) stress ratio, on PFC cyclic loading behaviour. At each stage, the fatigue performance of PFCs is compared to that of E-glass/polyester (GFRP) composites. A comprehensive constant-life diagram has been generated for hemp/polyester composites to facilitate life prediction of a PFC component.
It is a revelation to find that PFCs have better normalised fatigue performance than GFRP. While plant fibre type and quality, textile architecture and composite fibre content have a significant impact on the static properties, they have little impact on the material fatigue strength coefficient b (which dictates the slope of the S-N curve). In essence, higher static properties are a sign of superior fatigue loading capacities throughout their lifetime. Fracture mechanisms and modes are the same for all plant fibre types, but depend on fibre content, textile architecture and load regimes (stress ratios).
Increasing stress ratios lead to improved fatigue performance in PFCs. Comparison of normalised constant-life diagrams for PFC and GFRP show that PFCs are significantly more stable in tension-tension and tension-compression fatigue than GFRP but due to the lower compressive strength, they are poorer in compression-compression fatigue loading.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 31 Mar 2017 04:21
Last Modified: 31 Mar 2017 06:57
Uncontrolled Keywords: polymer-matrix composites (PMCs); natural fibres; fatigue; S-N diagrams; constant-life diagrams
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: https://doi.org/10.1016/j.compscitech.2012.10.015
URI: http://eprints.usq.edu.au/id/eprint/31021

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