Can flax replace E-glass in structural composites? A small wind turbine blade case study

Shah, Darshil U. and Schubel, Peter J. and Clifford, Mike J. (2013) Can flax replace E-glass in structural composites? A small wind turbine blade case study. Composites Part B: Engineering, 52. pp. 172-181. ISSN 1359-8368


In directly addressing the question, ‘can flax replace E-glass as a reinforcement for structural composites?’, this manuscript adopts a novel comparative case study approach to investigate the manufacture and mechanical testing of full-scale 3.5-m composite rotor blades (suitable for 11 kW turbines) built from flax/polyester and E-glass/polyester.

The resin transfer moulded flax blade is 10% lighter (fibre mass saving of 45%) than the identical construction E-glass blade. Static flap-bending tests, conducted in accordance to certification standards, confirm that like the E-glass blade, the flax blade satisfies the structural integrity requirements under ‘normal operation’ and ‘worst case’ loading. It is consequently claimed that flax is a potential structural replacement to E-glass for similar composite small wind turbine blade applications.

The failure root bending moment and corresponding tip displacement of the flax blade are 11.6 kN m and 2300 mm, respectively. The blades exhibit distinctly different load–deflection curves and failure modes. The mean flexural rigidity of the flax and E-glass blades are estimated to be 24.6 kN m2 and 43.4 kN m2, respectively. It is interesting to find that although flax fibres and their composites are generally recognized for their stiffness, a flax blade cannot compete against an E-glass blade in terms of stiffness.

Statistics for USQ ePrint 31016
Statistics for this ePrint Item
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 04:50
Last Modified: 31 Mar 2017 07:00
Uncontrolled Keywords: biocomposites; natural fibres; structural applications; rotor blades; mechanical testing; cost analysis
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:

Actions (login required)

View Item Archive Repository Staff Only