Abstract
The mechanical behavior of new materials for wind turbine blades is initially characterized by using coupon testing. If the results of the coupon testing look promising, then the materials are incorporated into a blade and certified through a full-scale blade test. The coupon testing is not always representative of performance of the new materials, and full-scale-blade testing is time consuming and very expensive—on the order of several hundred thousand dollars. To bridge the large gap between coupon testing and a full-scale test, subcomponent testing is proposed as a cost-effective alternative. To design a meaningful scaled-down subcomponent emulating the structural conditions experienced in the full-scale component, it is proposed that similitude theory can be applied to a scaled replica of the I-beam structure of a wind turbine blade involving spar caps and the shear web. In the current research, the governing equations for the bending of a simply-supported shear deformable thin-walled composite I-beam are analyzed to derive the scaling laws. Fidelity of the derived scaling laws is then examined as a model-validation criterion by mapping the maximum deflection of variant subcomponents to the full-scale composite I-beam. The combined effects of the size of the subcomponents and the ply stack-up schemes on the fidelity of the scaling laws are then investigated through complete and partial similarity conditions. According to the results, preserving the aspect ratio plays a critical role in successful prediction of the maximum bending of the full-scale I-beam. Also, subcomponents with a modified ply stack-up could be found with good accuracy in maximum bending prediction using the derived scaling laws.
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References
J.F. Mandell, D. Combs, D.D. Samborsky, Fatigue of fiberglass beam substructures. Wind Energy 16, 99 (1995)
D.S. Cairns, J.D. Skramstad, J.F. Mandell, Evaluation of hand lay-up and resin transfer molding in composite wind turbine blade structures, in 20th 2001 ASME Wind Energy Symposium, 2001
J.F. Mandell, R. Creed Jr., Q. Pan, D.W. Combs, M. Shrinivas, Fatigue of fiberglass generic materials and substructures. Wind Energy 15, 207–213 (1994)
F. Sayer, N. Post, A. Van Wingerde, H. Busmann, F. Kleiner, W. Fleischmann, M. Gansow, Testing of adhesive joints in the wind industry, in European Wind Energy Conference and Exhibition 2009, 2009, pp. 288–315
F. Sayer, A. Antoniou, A. Van Wingerde, Investigation of structural bond lines in wind turbine blades by sub-component tests. Int. J. Adhes. Adhes. 37, 129–135 (2012)
D.S. Zarouchas, A.A. Makris, F. Sayer, D. Van Hemelrijck, A.M. Van Wingerde, Investigations on the mechanical behavior of a wind rotor blade subcomponent. Compos. Part B 43, 647–654 (2012)
F.M. Jensen, B.G. Falzon, J. Ankersen, H. Stang, Structural testing and numerical simulation of a 34 m composite wind turbine blade. Compos. Struct. 76, 52–61 (2006)
D. White, W. Musial, S. Engberg, Evaluation of the B-REX fatigue testing system for multi-megawatt wind turbine blades, in Collection of the 2005 ASME Wind Energy Symposium Technical Papers at the 43rd AIAA Aerospace Sciences Meeting and Exhibit, pp. 52–65, 2005
G.J. Simitses, J. Rezaeepazhand, Structural similitude for laminated structures. Compos. Eng. 3, 751–765 (1993)
J. Rezaeepazhand, G.J. Simitses, Use of scaled-down models for predicting vibration response of laminated plates. Compos. Struct. 30, 419–426 (1995)
J. Rezaeepazhand, G.J. Simitses, J.H. Starnes Jr., Design of scaled down models for stability of laminated plates. AIAA J. 33, 515–519 (1995)
G.J. Simitses, J. Rezaeepazhand, Structural similitude and scaling laws for buckling of cross-ply laminated plates. J. Thermoplast. Compos. Mater. 8, 240–251 (1995)
J. Rezaeepazhand, G.J. Simitses, J.H. Starnes Jr., Design of scaled down models for predicting shell vibration response. J. Sound Vib. 195, 301–311 (1996)
J. Rezaeepazhand, G.J. Simitses, Structural similitude for vibration response of laminated cylindrical shells with double curvature. Compos. Part B 28, 195–200 (1997)
M. Eydani Asl, C. Niezrecki, J. Sherwood, P. Avitabile, Predicting the vibration response in subcomponent testing of wind turbine blades, in Proceedings of the IMAC-XXXIII, Orlando, 2–5 February 2015
M. Eydani Asl, C. Niezrecki, J. Sherwood, P. Avitabile, Application of structural similitude theory in subcomponent testing of wind turbine blades, in Proceedings of the American Society for Composites 2014, La Jolla, 8–10 September 2014
J. Lee, Flexural analysis of thin-walled composite beams using shear-deformable beam theory. Compos. Struct. 70, 212–222 (2005)
J.N. Reddy, Mechanics of laminated composite plates and shells: theory and analysis (CRC Press, Boca Raton, 2004)
D.T. Griffith, T.D. Ashwill, The Sandia 100-meter all-glass baseline wind turbine blade: SNL100-00, Sandia National Laboratories, Albuquerque, Report no. SAND2011-3779, 2011
Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant Number 1230884 (Achieving a Sustainable Energy Pathway for Wind Turbine Blade Manufacturing). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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Appendix
Appendix
Prototype (top) and models with different scales and layups (bottom)
Geometry and coordinate of the I-beam [17]
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Asl, M.E., Niezrecki, C., Sherwood, J., Avitabile, P. (2016). Similitude Analysis of Composite I-Beams with Application to Subcomponent Testing of Wind Turbine Blades. In: Sciammarella, C., Considine, J., Gloeckner, P. (eds) Experimental and Applied Mechanics, Volume 4. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-22449-7_14
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DOI: https://doi.org/10.1007/978-3-319-22449-7_14
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