Fatigue life prediction of rotor blade composites: Validation of constant amplitude formulations with variable amplitude experiments

The Science of Making Torque from Wind 2012

Westphal, T.^1 ; Nijssen, R.P.L.^1

Knowledge Centre WMC, Kluisgat 5, Wieringerwerf

1771MV, Netherlands^1

关键词: Constant amplitude;    Constant life diagram;    Fatigue life prediction;    Prediction accuracy;    Variable amplitude fatigue;    Variable amplitudes;    Variable-amplitude experiments;    Wind turbine loading;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012107/pdf
DOI  :  10.1088/1742-6596/555/1/012107

来源: IOP

【 摘 要 】

The effect of Constant Life Diagram (CLD) formulation on the fatigue life prediction under variable amplitude (VA) loading was investigated based on variable amplitude tests using three different load spectra representative for wind turbine loading. Next to the Wisper and WisperX spectra, the recently developed NewWisper2 spectrum was used. Based on these variable amplitude fatigue results the prediction accuracy of 4 CLD formulations is investigated. In the study a piecewise linear CLD based on the S-N curves for 9 load ratios compares favourably in terms of prediction accuracy and conservativeness. For the specific laminate used in this study Boerstra's Multislope model provides a good alternative at reduced test effort.