Restricted accessResearch articleFirst published online 2021-12
Multi-axial large-scale testing of a 34 m wind turbine blade section to evaluate out-of-plane deformations of double-curved trailing edge sandwich panels within the transition zone
Transverse cracks in the double curved trailing edge panels within the transition zone are among one of the increasingly encountered in-field damages found on wind turbine blades today. Believed to be root cause of these transverse cracks, are the out-of-plane deformation of the double curved trailing edge pressure side panels. These deformations are evaluated on the inner 15 m section of a 34 m wind turbine blade – referred to here as the root section. Through a parametrical study the free end of the root section is loaded in the quasi-static regime comprising edgewise loading (Fy) and torsional moment (Mz) around the longitudinal axis of the blade. The root section is through a multi-scale numerical analysis found to exhibit representative structural behavior in terms of out-of-plane deformations within the area of interest. A combination between Fy and Mz are found to generate the highest peak-to-peak out-of-plane deformation of 15.9 mm.
AslMENiezreckiCSherwoodJ, et al. (2014) Application of structural similitude theory in subcomponent testing of wind turbine blades. In: 29th annual technical conference of the American society for composites. La Jolla, California, USA: Curran, Available at: https://www.tib.eu/en/search/id/TIBKAT%3A815726961/
2.
BrøndstedPLilholtHLystrupA (2005) Composite materials for wind power turbine blades. Annual Review of Materials Research35(1): 505–538.
C. IVS (2016) Guide2Defects. Guide2Defect, 06January. [Online]. Available at: www.guide2defect.com (accessed 17 December 2018).
5.
DNV GL AS (2015) DNVGL-ST-0376 - Rotor blades for wind turbines.
6.
GriffithDTAshwillTD (2011) The Sandia 100-meter All-Glass Baseline Wind Turbine Blade: SNL100-00. New Mexico: Wind Energy Technologies Department, Sandia National Laboratories.
HallN (2015) Aerodynamic Center - ac. National Aeronautics and Space Administration (NASA), 5 May. [Online]. Available at: https://www.grc.nasa.gov/WWW/k-12/airplane/ac.html (accessed 6 November 2020).
9.
IEC (2014) IEC 61400-23, Wind turbines - Part 23: Full-scale structural testing of rotor blades.
10.
JensenFM (2008) Ultimate Strength of Large Wind Turbine Blade. Lyngby: Department of Civil Engineering, Technical University of Denmark, Kgs.
11.
JensenFMFalzonBAnkersenJ, et al. (2006) Structural testing and numerical simulation of a 34m composite wind turbine blade. Elsevier, Composite Structures76(1–2): 52–61.
12.
JensenFMSørensenJDMcGuganM, et al. (2014) Regain of operational life time of installed WTG blades with structural defects. Roskilde: Bladena.
13.
JensenFMWerkMBuligaA, et al. (2019). Root and Transition Zone (RATZ) and Reduction O&M Cost of WT Blades. Roskilde: Bladena A/S.
14.
KarakuzuRIctenBMTekinsenÖ (2010) Failure behavior of composite laminates with multi-pin loaded holes. Journal of Reinforced Plastics and Composites29(2): 247–253.
15.
LarsOCTLundEOleTT (2010) Structural collapse of a wind turbine blade. Part A: Static test and equivalent single layered models. Composites Part A: Applied Science and Manufacturing41(2): 257–270.
16.
LeBlancBNiezreckiCAvitabileP, et al. (2011) Full-field inspection of a wind turbine blade using three-dimensional digital image correlation. In: Industrial and commercial applications of smart structures technologies (Proceedings volume 7979), San Diego, California, USA: SPIE - International Society for Optics and Photonics, Available at: http://www.proceedings.com/spie7979.html
17.
LeeHGParkJ (2016) Static test until structural collapse after fatigue testing of a full-scale wind turbine blade. Composite Structures136: 251–257.
18.
NaN (2008) Global wind service. Global wind service, 6January. [Online]. Available at: https://globalwindservice.com/ (accessed 14 January 2019).
19.
NielsenMRoczek-SieradzanAFindJM, et al. (2010) Full scale test SSP 34m blade, edgewise loading LTT. Extreme load and PoC_InvE data report, RISØ DTU National Laboratory for Sustainable Energy, Roskilde.
20.
PoozeshPBaqersadJNiezreckiC, et al. (2017) Large-area photogrammetry based testing of wind turbine blades. Mechanical Systems and Signal Processing86(1): 98–115.
21.
RoczekA (2009) Optimization of Material Layup for Wind Turbine Blade Trailing Edge Panels. Roskilde: RISØ DTU National Laboratory for Sustainable Energy.
22.
SierosGChaviaropoulosPSørensenJD, et al. (2012) Upscaling wind turbines: Theoretical and practical aspects and their impact on the cost of energy. Wind Energy15(1): 3–17.
23.
SinghS (2016) Wind power: Future lies within. In: 7th India international conference on power electronics, Patiala, 17–19 November. IEEE.
24.
ThomsenOT (2009) Sandwich materials for wind turbine blades - present and future. Journal of Sandwich Structures and Materials11(1): 7–26.
25.
WangHSHungCLChangFK (1996) Bearing failure of bolted composite joints .1. Experimental characterization. Journal of Composite Materials30(12): 1284–1313.
26.
ZhouHFDouHYQinLZ, et al. (2014) A review of full-scale structural testing of wind turbine blades. Renewable and Sustainable Energy Reviews33: 177–187.
