11 May 2022
11 May 2022
Status: this preprint is currently under review for the journal WES.

Methodology to Predict Stiffness Knock-down in Laminates for Wind Turbine Blades with Artificial Wrinkles

Heloisa Guedes Mendonça1,2, Lars Pilgaard Mikkelsen1, Xiao Chen1, Johannes Bode2, Flemming Mortensen2, Phillipp Ulrich Haselbach1, and Kim Branner1 Heloisa Guedes Mendonça et al.
  • 1Department of Wind Energy, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark
  • 2Vestas Wind Systems, Hedeager 42, 8200 Aarhus , Denmark

Abstract. This work presents a methodology to evaluate the effect of wrinkles defects in the stiffness response of laminates characteristic of wind turbine blades. The assessment is carried out through numerical models and experimental tests with coupon specimens embedded with artificial wrinkles. Specimens are manufactured with two types of defects, prone to arise along the manufacturing process of wind turbine blades. Image-based numerical models were built to enclose the actual features 5 of the cross-sectional wrinkling of each defect type. Experimental quasi-static tension and compression tests were performed, where extensometers collect the strain distribution about the wrinkle section as around the flat section of the test specimens. 2D finite element simulations carried out in Abaqus/Standard captured the stiffness behaviour of the two types of wrinkles. The numerical approach is validated against the quasi-static tests retrieving a fair agreement with experimental data. A significant knock-down in the stiffness response was found due to the wrinkle with larger aspect ratio amplitude/half-wavelength.

Heloisa Guedes Mendonça et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2022-28', Anonymous Referee #1, 02 Jul 2022 reply

Heloisa Guedes Mendonça et al.

Heloisa Guedes Mendonça et al.


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Short summary
Wrinkles are production defects of wind turbine blades characterized by fibre waviness through the laminate thickness. Such defects are pointed to as one of the primary sources of premature failure of the blade, which impact the structure's structural reliability. This work shows a methodology to evaluate the impact of wrinkles on wind turbine blades featuring preliminary results, which present the detrimental effect of small wrinkles on the structural response of the blade.