Numerical Study of Deflection and Stress Distribution on Composite Box Spar Structure – Application In Wind Turbine Blade

Putri Safina Ufaira, Putu Suwarta, Galih Bangga

Abstract


This paper present finite element analysis on the internal structure of wind turbine to examined the deflection and stress distribution. The structure was modeled as a cantilever box beam with constant cross section along the length. The dimension of the structure was set according to the original design of the 10 MW AVATAR (Advanced Aerodynamic Tools for Large Rotors) wind turbine. The proposed materials were unidirectional thin-ply TC35/Epoxy and M55/Epoxy carbon composites and standard
thickness S−Glass 913/Epoxy composite. The fibre at the spar caps is oriented at 90o and at the shear webs at 0o. The deflection curve of the three composite materials showing non-linear behaviour with a maximum deflection of 2.618 m, 2.429 m, 4.175 m at the blade tip for S−Glass 913/Epoxy, T35/Epoxy, M55/Epoxy respectively which is less than the maximum deflection of an existing AVATAR beam. The critical stresses are located at the top outer surface of the spar cap which received the load directly and at the intersection between the spar caps and shear webs where stress transfer occurs. The deflection performance of the structure is dictated by the transverse Young’s Modulus (E22)  while the longitudinal Young’s Modulus (E11) plays an important role on stress distribution.


Keywords


Box spar; carbon fibre composite; glass fibre composite; deflection; stress distribution; wind turbine blade

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References


IEA, “World Energy Outlook 2019,” 2019.

G. Bangga, “Comparison of blade element method and CFD simulations of a 10 MW wind turbine,” Fluids, vol. 3, no. 4, 2018, doi: 10.3390/fluids3040073.

G. Bangga, Three-dimensional flow in the root region of wind turbine rotors, no. July. 2018.

A. R. Ghasemi and M. Mohandes, “Composite Blades of Wind Turbine: Design, Stress, Analysis, Aeroelasticity, and Fatigue,” in Wind Turbines - Design, Control and Applications, vol. 4, no. 3, A. G. Aissaoui and A. Tahour, Eds. 2016.

P. S. Veers et al., “Trends in the design, manufacture and evaluation of wind turbine blades,” Wind Energy, vol. 6, no. 3, pp. 245–259, 2003, doi: 10.1002/we.90.

K. Cox and A. Echtermeyer, “Structural design and analysis of a 10MW wind turbine blade,” Energy Procedia, vol. 24, no. 1876, pp. 194–201, 2012, doi: 10.1016/j.egypro.2012.06.101.

P. Prombut and C. Anakpotchanakul, “Deflection of Composite Cantilever Beams with a Constant I-Cross Section,” IOP Conf. Ser. Mater. Sci. Eng., vol. 501, no. 1, 2019, doi: 10.1088/1757-899X/501/1/012025.

P. C. (CRES) D. Lekou, D. Chortis, A. I. (CENER) X. Munduate, K. T. H. Aa. Madsen, K. Yde, M. R. (GE) M. Stettner, G. S. (ECN) F. Grasso, R. Savenije, and C. F. A. (LM), “AVATAR Reference Blade Design,” no. November 2013, pp. 1–52, 2017.

D. Jensen, Peter Hjuler; Bacharoudis, K; Lekou, D.J; Makris, A; Dekker, J.P; Winkel, G.D; Croce, A., Wang, “Deliverable 2.22 - New lightweight structural blade designs & blade designs with build-in structural couplings,” no. April 2014, pp. 1–21, 2014.

P. Roth-johnson, R. E. Wirz, and E. Lin, “Structural design of spars for 100-m biplane wind turbine blades,” Renew. Energy, vol. 71, pp. 133–155, 2014, doi: 10.1016/j.renene.2014.05.030.

P. Suwarta, “Pseudo-ductility of Unidirectional Thin-Ply Hybrid Composites,” Pseudo-ductility Unidirectional Thin-Ply Hybrid Compos., 2020.

J. C. Robin Amacher, Wayne Smith, Clemens Dransfeld, John Botsis, “Thin Ply: from Size-Effect Characterization to Real Life Design,” Camx 2014, 2014, [Online]. Available: http://www.thinplytechnology.com/mesimages/fichiers/NTPT_CAMX_SAMPE_Paper_2014.pdf.

A. A. Croce et al., “Effect of blade flexibility and structural tailoring on loads,” no. November, 2017.

H. Nazha and Z. Aldeen, “A Comparative Study Between Epoxy S-Glass UD And Epoxy Carbon UD For Their Use As Manufacturing Materials For Wind Turbine Blades,” no. June, pp. 33–41, 2020, doi: 10.5815/ijmsc.2020.03.04.




DOI: http://dx.doi.org/10.12962/j25807471.v6i1.10648

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