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

conference contribution
posted on 2017-12-06, 00:00 authored by Jayantha EpaarachchiJayantha Epaarachchi, P Clausen
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.


Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)


Parent Title

Structural integrity and fracture : proceedings of the International Conference, SIF2004, 26-29 September 2004. Brisbane, Australia

Start Page


End Page


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Start Date





Brisbane, Qld.


Australian Fracture Group

Place of Publication

Brisbane, Qld.

Peer Reviewed

  • Yes

Open Access

  • No

External Author Affiliations

Faculty of Engineering and Physical Systems; University of Newcastle;

Era Eligible

  • Yes

Name of Conference

Structural Integrity and Fracture International Conference

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