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Comparing Fatigue Strength From Full Scale Blade Tests With Coupon-Based Predictions

[+] Author Affiliations
Hans van Leeuwen, Don van Delft

Delft University of Technology, Delft, The Netherlands

John Heijdra, Henk Braam

Netherlands Energy Research Foundation ECN, Petten, The Netherlands

Eric Jo̸rgensen

Riso̸ National Laboratory, Roskilde, Denmark

Denja Lekou, Pantelis Vionis

Centre for Renewable Energy Sources, Pikermi Attiki, Greece

Paper No. WIND2002-21, pp. 1-9; 9 pages
doi:10.1115/WIND2002-21
From:
  • ASME 2002 Wind Energy Symposium
  • ASME 2002 Wind Energy Symposium
  • Reno, Nevada, USA, January 14–17, 2002
  • Conference Sponsors: ASME
  • ISBN: 1-56347-476-X
  • Copyright © 2001 by The American Institute of Aeronautics and Astronautics, Inc. and ASME

abstract

In order to get a deeper understanding of the blade to blade variations and to determine the statistical distribution of the fatigue strength of rotor blades, 37 small rotor blades have been tested in static and fatigue loading. The blades are 3.4 m commercially available blades adapted to the needs of the project. Next to these blade tests, also coupons of identical material have been tested. The tests have encompassed static flapwise bending tests, flapwise fatigue tests at two different sections of the blade and edgewise fatigue tests. Since some blades could be re-used after a first test, a total number of 42 blade tests has been carried out in three different testing laboratories. The blades showed large deformation and development of creep. After correction for these phenomena, the fatigue strength of the blades seemed very good predictable with the classical Goodman relation using the well known slope parameter of 10.

Copyright © 2001 by The American Institute of Aeronautics and Astronautics, Inc. and ASME

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