The Brazier effect in multi-bay aerofoil sections

Cecchini, Luca

doi:10.2514/6.2004-1522

Cited by 4 publications

(6 citation statements)

References 3 publications

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“…Assuming that the box section is a rectangular symmetric cross section and that the bending load is primarily supported by the box girder, equation can be used to calculate the crushing force acting on each shear web per unit length of the blade (see Cecchini and Weaver ). where w is the local width of the box girder and h is the box girder's depth.…”

Section: Simplified Semi‐analytical Modelmentioning

confidence: 99%

“…With the equations predicting the theoretical crushing force per unit length (equations (5) and (6)) established, the resulting values can be compared with those calculated from the experimental and FE analysis (equation (7)).…”

Section: Crushing Pressurementioning

confidence: 99%

“…The distortion reduces the section's second moment of area and its flapwise bending stiffness. Brazier, however, was the first to realize that such a reduction in the second moment of area would lead to a non‐linear bending response and eventual structural collapse. From Brazier's analysis, it follows that the crushing pressure increases with the square of the curvature of the section and (before large cross‐sectional deformations occur) with the square of the bending moment.…”

Section: Introductionmentioning

confidence: 99%

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

Jensen

Cecchini²,

Stang

et al. 2011

Wind Energy

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Critical failure was observed in the shear web of a wind turbine blade during a full‐scale testing. This failure occurred immediately before the ultimate failure and was partly caused by buckling and non‐linear cross‐sectional strain. Experimental values had been used to compare and validate both numerical and semi‐analytical results in the analysis of the shear webs in the reinforced wind turbine blade. Only elastic material behaviour was analysed, and attention was primarily focused on the Brazier effect. The complex, geometrically non‐linear and elastic stress–strain behaviour of the shear webs and the cap in compression were analysed using a balance of experimental, numerical and analytical approaches. It was noted that the non‐linear distortion was caused by the crushing pressure derived from the Brazier effect. This Brazier pressure may have a significant impact on the design of new blades, and an optimized box girder had been studied to show the importance of including Brazier pressure in the design process for future wind turbine blades. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Simplified Semi‐analytical Modelmentioning

confidence: 99%

Section: Crushing Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jensen

Cecchini²,

Stang

et al. 2011

Wind Energy

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“…[16], [17], [18], [19]. The transverse stresses causing the flattening are sometimes referred to as the crushing pressure, since the same effect would occur if an external pressure was applied (see Figure 2).…”

Section: State Of the Artmentioning

confidence: 99%

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

Section: Future Workmentioning

confidence: 99%

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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