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. In addition to these blade tests, coupons of the blade 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, development of creep and stiffness reduction. After correction for these phenomena, the fatigue strength of the blades was predicted very well by the classical Goodman relation using the well-known slope parameter of 10.
Comparing Fatigue Strength From Full Scale Blade Tests With Coupon-Based Predictions
Contributed by the Solar Energy Division of the American Society of Mechanical Engineers for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, March 2002; final revision, July 2002. Associate Editor: D. Berg.
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van Leeuwen, H., van Delft, D., Heijdra, J., Braam, H., Jørgensen, E. R., Lekou, D., and Vionis, P. (November 8, 2002). "Comparing Fatigue Strength From Full Scale Blade Tests With Coupon-Based Predictions ." ASME. J. Sol. Energy Eng. November 2002; 124(4): 404–411. https://doi.org/10.1115/1.1509463
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