Cost Effective Large Blade Components by Using Carbon Fibers

[+] Author and Article Information
P. A. Joosse, D. R. V. van Delft

Delft University of Technology, WMC-Group, Stevinweg 1, 2628 CN Delft, The Netherlands

Chr. Kensche

DLR, Institute of Structures and Design, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

D. Soendergaard

LM Glasfiber A/S, Rolles Mollevej 1, DK-6640 Lunderskov, Denmark

R. M. van den Berg

LM Glasfiber Holland BV, PO Box 1126, 1700 BC Heerhugowaard, The Netherlands

F. Hagg

Stork Product Engineering BV, Czaar Peterstraat 229, 1018 PL Amsterdam, The Netherlands

J. Sol. Energy Eng 124(4), 412-418 (Nov 08, 2002) (7 pages) doi:10.1115/1.1510526 History: Received March 01, 2002; Revised August 01, 2002; Online November 08, 2002
Copyright © 2002 by ASME
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Joosse, P.A. et al., 2000, “Economic Use of Carbon Fibers in Large Wind Turbine Blades?” Proc. of 19th ASME Wind Energy Symp., Paper No. AIAA-2000-0058, Reno, NV, pp. 367–374.
Schutz, D., Gerharz, J.J., and Alschweig, E., 1981, “Fatigue Properties of Unnotched, Notched and Jointed Specimens of a Graphite/Epoxy Composite,” Fatigue of Fibrous Composite Materials, ASTM STP 723, pp. 31–47.
Kensche, Ch.W., 1985, “Fatigue of Composite Materials in Sailplanes and Rotor Blades,” XIX OSTIV-Congress, Publ. XVIII, Rieti, Italy, pp. 57–62.
Dutton, A.G. et al., 2001, “The Potential of Sectional Wind Turbine Blades,” EWEC 2001, Copenhagen, Denmark, pp. 310–313.
Bulder, B. et al., 2001, “Theory and User Manual Bladopt,” ECN Report ECN-C-01-011.


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Ranking of different CFRP combinations for application as an integral blade part, with epoxy (EP) or vinylester (VE) resin
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Typical fatigue failure of dogbone specimen
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Panex/VE fatigue results compared to literature data (R = −1, mean values only)
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Typical failure of UD specimen
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Crash program fatigue data (R = −1 tension-compression loading)
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Indication of mean static and fatigue strain and S-N curve slope (inverse value)
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Test set-up for high-cycle fatigue, showing clip gauge (left) and temperature sensor (right)
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Fatigue results (R = −1) of Panex/epoxy compared to other data
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Test specimen used for testing the fatigue properties of the stud joint
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Picture of hybrid laminate in the stud joint (carbon fibers, see arrow)
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Gap (see arrow) shown during static tension test of T-bolt specimen
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Comparison of hybrid joint types to full-glass version
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Influence of parameters on cost ratio




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