Accelerated full scale fatigue testing of a small composite wind turbine blade using a mechanically operated test rig

Epaarachchi, Jayantha A. and Clausen, Philip D. (2004) Accelerated full scale fatigue testing of a small composite wind turbine blade using a mechanically operated test rig. In: 2004 Structural Integrity and Fracture International Conference (SIF2004), 26-29 Sept 2004, Brisbane, Australia.

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A 2.5m long glass fibre reinforced plastic composite wind turbine blade was fatigue tested by means of a mechanically operated test rig. The rig uses a crank eccentric mechanism to flex the blade by a constant displacement in the flapwise direction for each load cycle. A yearly fatigue-loading spectrum for the blades has been developed from using short-term detailed aeroelastic and wind measurements, results from a detailed finite element model of the blade and averaged long-term wind data form the Australian Bureau of Meteorology. This spectrum contained over 200 load levels covering R ratios from 0 to 0.9. An equivalent damage spectrum has been formulated to minimise the number of load levels within the spectrum without compromising the amount of damage done to the blade structure. Results of fatigue testing indicate that predictions are close to the measured fatigue life of the blade. The stress distribution in fatigue critical areas of the blade during testing was found to be similar to the expected stress distribution under normal operational condition.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published when first/lead author was working in CQU, Rockhampton. Proceedings ISBN: 1864997605. Conference web site at
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 31 Dec 2010 06:22
Last Modified: 02 Jul 2013 23:45
Uncontrolled Keywords: fatigue, spectrum loading, full-scale testing
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
B Economic Development > 85 Energy > 8505 Renewable Energy > 850509 Wind Energy

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