The Brazier effect in wind turbine blades and its influence on design

Jensen, F.; Cecchini, Luca; Stang, Henrik; Nielsen, Rasmus Frimann

doi:10.1002/we.473

Cited by 32 publications

(33 citation statements)

References 8 publications

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“…Ovalisation of the load carrying box girder was measured in the full-scale test and simulated in non-linear FE-calculations, see ref. [17], [21].…”

Section: State Of the Artmentioning

confidence: 99%

“…[16], [21]. Figure 3 presents a frozen frame picture of the critical, failure mode of the box girder full-scale test.…”

Section: Skin Debonding From the Sandwich Core In The Shear Webmentioning

confidence: 99%

“…This failure mode is caused by a complex load and strain distribution described in ref. [21]. Here and in paper 3 only one load component (Brazier load) is taken into consideration and therefore much more experimental work should be done before a full understanding of the influence from all load components can be obtained.…”

Section: Skin Debonding From the Sandwich Core In The Shear Webmentioning

confidence: 99%

“…[38] Similar tests have been performed before, see ref. [21], [39]. The major difference presented here made use of more sophisticated measuring equipment such as DIC, which gave a full surface deformation and strain picture of the deformed section and reveals how the web ovalises asymmetrically, Figure 11a. …”

Section: Box Section Test and Fe-modelmentioning

confidence: 99%

“…These areas are recommended to be further studied in the future. [16], [18], [21]. [16], [17], [29].…”

Section: Future Workmentioning

confidence: 99%

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Investigating the impact of non‐linear geometrical effects on wind turbine blades—Part 1: Current status of design and test methods and future challenges in design optimization

et al. 2010

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This paper is the first part of a three paper series and it deals with full-scale tests of a load carrying box girder. The two other papers present more details on smaller sub component level as well as cap specimens (paper 2) and shear web (paper 3). This paper also links to the two other papers and brings the main results from them into the relevance for a wind turbine blade designer.The investigated failure modes in all three papers relate to the Brazier effect, which is expected to be the key dominating failure mechanism in future wind turbine blade designs. Brazier effect may also have a significant impact on present wind turbine blades. In this paper a 34m long load carrying box girder has been tested in static flapwise bending and it has been demonstrated that, for this design, Brazier effect is a critical phenomenon of great relevance for the ultimate failure strength. 2The box girder has been evaluated with and without a cap (wire) reinforcement. The cap reinforcement is one out of seven inventions Risø DTU published in 2008, and which all are intended to result in lighter and more reliable blade design.

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“…Ovalisation of the load carrying box girder was measured in the full-scale test and simulated in non-linear FE-calculations, see ref. [17], [21].…”

Section: State Of the Artmentioning

confidence: 99%

“…[16], [21]. Figure 3 presents a frozen frame picture of the critical, failure mode of the box girder full-scale test.…”

Section: Skin Debonding From the Sandwich Core In The Shear Webmentioning

confidence: 99%

Section: Skin Debonding From the Sandwich Core In The Shear Webmentioning

confidence: 99%

Section: Box Section Test and Fe-modelmentioning

confidence: 99%

“…These areas are recommended to be further studied in the future. [16], [18], [21]. [16], [17], [29].…”

Section: Future Workmentioning

confidence: 99%

See 3 more Smart Citations

Investigating the impact of non‐linear geometrical effects on wind turbine blades—Part 1: Current status of design and test methods and future challenges in design optimization

et al. 2010

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Materials, Innovations and Future Research Opportunities on Wind Turbine Blades—Insight Review

Karthikeyan

Anand

Suthakar

et al. 2018

Env Prog and Sustain Energy

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Nowadays, wind turbine blades are manufactured using several materials and methodologies to save cost and to increase their performance. This article gives a brief overview of blade materials and prevailing manufacturing traits to make them more reliable and cost‐efficient. The surface roughness, manufacturing defects, and fluctuating loads in flow fields significantly affect wind turbine power generation. However, these problems can be reduced by using appropriate materials. Therefore, selection of wind turbine materials is extremely important to maintain its performance even in harsh environmental conditions. This article describes an overview of current material solutions for overcoming material defects like delamination, structural distortion, and icing problems in the Polar Regions. It involves composites, smart alloys, protective coatings, etc. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13046, 2019 Highlights Types of loading, failure mechanisms and current manufacturing methods of wind turbine blades. Innovative blade material approach: Morphing concepts, Glass or Carbon fiber/Nano‐/Bio‐Composites. Active and passive strategies for anti‐icing or de‐icing of wind turbine blades.

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Effects of composite fiber orientation on wind turbine blade buckling resistance

Cox

Echtermeyer

2013

Wind Energ.

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This paper utilized the inherent directional properties of composite materials to increase the critical buckling load of a 70 m carbon/glass hybrid wind turbine blade. The effect of changing the fiber orientations of the less stiff, off-axis glass fiber plies (referred to as stability plies in this paper) was studied via nonlinear finite element buckling simulations. The orientation of the stability plies was found to influence the onset of the Brazier effect, which further influenced blade stability and buckling failure location. Although both blade weight and laminate thickness remained constant, an increase in critical buckling load of 8% was achieved with a negligible change in bending stiffness. The more stable blade allowed for removal of material leading to a decrease in maximum laminate thickness and a drop in blade mass of 3.3%. Modifications to the ply stacking sequence and carbon fiber usage were also considered and were found to affect the buckling load but not necessarily the optimum fiber orientation of the stability plies.

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The Brazier effect in wind turbine blades and its influence on design

Cited by 32 publications

References 8 publications

Investigating the impact of non‐linear geometrical effects on wind turbine blades—Part 1: Current status of design and test methods and future challenges in design optimization

Investigating the impact of non‐linear geometrical effects on wind turbine blades—Part 1: Current status of design and test methods and future challenges in design optimization

Materials, Innovations and Future Research Opportunities on Wind Turbine Blades—Insight Review

Effects of composite fiber orientation on wind turbine blade buckling resistance

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