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TECHNICAL PAPERS

New Fatigue Data for Wind Turbine Blade Materials

[+] Author and Article Information
John F. Mandell, Daniel D. Samborsky, Lei Wang

Montana State University, Bozeman, MT 59717

Neil K. Wahl

Montana Tech of the University of Montana, Butte, MT 59701

J. Sol. Energy Eng 125(4), 506-514 (Nov 26, 2003) (9 pages) doi:10.1115/1.1624089 History: Received February 15, 2003; Online November 26, 2003
Copyright © 2003 by ASME
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References

Figures

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Small strand test apparatus
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Small strand test geometry
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Maximum applied fiber stress versus log cycles for small strands; R=0.1 (using measured cross-sectional area of glass fibers only, excluding resin)
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Calculated maximum tensile strain versus log cycles for small strands; R=0.1 (strain calculated by dividing maximum fiber stress by the fiber elastic modulus, 72.4 GPa)
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Normalized tensile stress versus log cycles for small strands with trend lines
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Normalized tensile stress versus log cycles for small strands with combined trend line
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Normalized fatigue diagram for D155 strands with 2000 fibers
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Normalized fatigue diagram for small strands with 45 fibers compared with larger 2000 fiber strands
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Maximum initial tensile strain for laminates and small strands; R=0.1
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Normalized maximum stress versus log cycles for polyester and vinyl ester impregnated small strands; R=0.1
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Goodman diagram based upon power law regression analysis, excluding static data 23
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S-N data for tensile fatigue at R-values 0.1, 0.5, 0.7, 0.8, and 0.9; database material DD16
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R=1.0, 0.9, and 0.8 data for material DD16 in terms of total test time to failure
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Tensile regime of goodman diagram showing effects of using different R-values at 104 and 106 cycles
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Fiber waviness in a unidirectional carbon ply (Fortafil 652)
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Laminate with introduced waviness
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Waviness characterization
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Effects of resin matrix toughness on compressive strength of laminates containing various severities of waviness
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Compressive strength versus waviness angle (2) compared with data from ±2 off-axis laminates
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Static compression failures and fatigue compression failures
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Compressive fatigue properties for laminates with 4 mm/35 mm waviness compared with woven fabric laminate (DD11) and control for waviness study (DD5P); R=10
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S-N diagram for large-tow unidirectional 0 deg carbon fiber/vinyl ester composites (UNI25 and UNI25A in the Database); R=0.1 and 10
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Fatigue strain diagram for large-tow unidirectional 0 deg Carbon Fiber/Vinyl Ester Composites (UNI25 and UNI25A in the Database), R=0.1 and 10, VF=0.40
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Compression fatigue data for hybrid laminates with vinyl ester and epoxy matrices, material CGD4 with a ply configuration (±45G/03C/±45G), 0 deg fabric is toray ACM-13-2 carbon and ±45 deg fabric is DB120 glass, 76% 0 deg material by volume; VF=0.50,R=10

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