Fatigue behaviour of fibreglass wind turbine blade material under variable amplitude loading

Delft, D. van; Winkel, G.; Joosse, P. A.

doi:10.2514/6.1997-951

Cited by 19 publications

(17 citation statements)

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“…As discussed by van Delft et al [138] and used by many other authors, the S-N behavior of composite materials at a constant R value is typically described using either Eq. 34 or 37.…”

Section: Trend Analysismentioning

confidence: 99%

“…However, to date, these data are limited in extent. Van Delfl et al [138,142,143] have examined the differences between the response in fiberglass to constant and variable amplitude loading using the WISPER and the WISPERX spectrum. Their experiments on a polyester fiberglass laminated with 0°and *45°layers at approximately 32 percent fiber volume provide insight into using constant amplitude S-N data to predict service lifetimes under the spectral loads normally encountered by wind turbines.…”

Section: Spectral Loadingmentioning

confidence: 99%

“…Van Delft et al [138,143] have used the constant-amplitude European database to predict the response of composite coupons to the WISPER and the WISPERX loads. Lifetimes were predicted using Miner's rule and a power-law fit, see Eq.…”

Section: 462 Predicted Service Lifetimementioning

confidence: 99%

See 2 more Smart Citations

On the Fatigue Analysis of Wind Turbines

Sutherland¹

1999

167

146

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“…As discussed by van Delft et al [138] and used by many other authors, the S-N behavior of composite materials at a constant R value is typically described using either Eq. 34 or 37.…”

Section: Trend Analysismentioning

confidence: 99%

Section: Spectral Loadingmentioning

confidence: 99%

See 1 more Smart Citation

On the Fatigue Analysis of Wind Turbines

Sutherland¹

1999

167

146

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“…2, or a log/linear formulation could be fit to the S-N data at each Rvalue as well [2]. Both of these characterizations have difficulties in characterizing fatigue behavior over the entire range S-N range, i.e., from the static strength at 0 cycles to high-cycle fatigue above 10 8 cycles.…”

Section: S-n Modelsmentioning

confidence: 99%

Effect of Mean Stress on the Damage of Wind Turbine Blades

Sutherland

Mandell

2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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In many analyses of composite wind turbine blades, the effects of mean stress on the determination of damage are either ignored completely or they are characterized inadequately.An updated Goodman diagram for the fiberglass materials that are typically used in wind turbine blades has been released recently. This diagram, which is based on the MSU/DOE Fatigue Database, contains detailed information at thirteen R-values. This diagram is the most detailed to date, and it includes several loading conditions that have been poorly represented in earlier studies. This formulation allows the effects of mean stress on damage calculations to be evaluated. The evaluation presented here uses four formulations for the S-N behavior of the fiberglass. In the first analysis, the S-N curve for the composite is assumed to be independent of mean stress and to have a constant slope. The second is a linear Goodman diagram, the third is a bi-linear Goodman diagram and the fourth is the full Goodman diagram. Two sets of load spectra, obtained by the LIST (Long term Inflow and Structural Test) program, are used for this * Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin company, for the U.S. Department of Energy under contract DE-AC04-94AL85000. 2 evaluation. The results of the analyses, equivalent fatigue loads and damage predictions, are compared to one another. These results illustrate a significant overestimation of the equivalent fatigue loads when the mean stress is not considered in the calculation. And, the results from the updated Goodman diagram illustrate that there are a significant differences in accumulated damage when the Goodman diagram includes information on the transition between compressive and tensile failure modes.

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“…As is the case for metallic materials, the order of the variations in magnitude of the fatigue loads can significantly influence the lifetime of a composite. Recognition of this phenomenon in wind turbine applications can be found in recent work 4,5 . Currently, guidelines require lifetime predictions for spectrum loading fatigue in wind turbine blades to be made using 'Miner's rule', which is a linear model that neglects order effects.…”

Section: Introductionmentioning

confidence: 99%

Strength Degradation and Simple Load Spectrum Tests in Rotor Blade Composites

Samborsky

Mandell

2005

43rd AIAA Aerospace Sciences Meeting and Exhibit

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This paper presents comprehensive residual strength data. These data were collected to aid the validation and development of a residual strength based lifetime prediction method. Such a model can be used to predict the lifetime of rotor blade materials subjected to variable amplitude fatigue. Residual strength tests were done on one multi-directional glassfiber/polyester material, which is representative of the material used in a wind turbine blade. This material has been characterized extensively in the DOE/MSU fatigue database. Both compressive and tensile residual strength tests were performed after three different fractions of the expected lifetime. Residual strength curves were determined in tension-tension, tension-compression, and compression-compression fatigue. In addition, simple load spectra, consisting of two load blocks with different amplitude, were investigated. These results are used, indirectly, to determine the form of the strength degradation model. The results seem consistent with the strength degradation found in the residual strength data. = Maximum load applied in fatigue n = Number of cycles with S max n eq = Number of cycles at S max , which would have led to the same current strength S r C = Strength degradation parameter Nomenclature

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Fatigue behaviour of fibreglass wind turbine blade material under variable amplitude loading

Cited by 19 publications

References 0 publications

On the Fatigue Analysis of Wind Turbines

On the Fatigue Analysis of Wind Turbines

Effect of Mean Stress on the Damage of Wind Turbine Blades

Strength Degradation and Simple Load Spectrum Tests in Rotor Blade Composites

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