Life prediction method of wind turbine blade flapping fatigue test based on CLD model

doi:10.19936/j.cnki.2096-8000.20240828.010

Abstract

Abstract: With the increasing length of wind turbine blades, the influence of blade weight and fixture weight on the blade during the flapping fatigue test can no longer be ignored. In this paper, taking the failure of the main beam of a 90 m-class blade waving fatigue experiment of Zhuzhou Times New Material Technology Co., Ltd., as the research object, the fatigue S-N curve of the main beam pultruded plate with different stress ratios was tested, and a new fatigue life prediction method for composite materials was proposed based on Goodman’s isotropic life diagram. By considering the effect of average stress on the fatigue life of the main beam, the article compares and analyzes the theoretical experimental prediction of damage and the actual fatigue experimental damage, and draws two important conclusions: ① The existing waving fatigue experimental load-equivalent method, which does not take into account the self-weight of the blade, can no longer reflect the actual loading of the blade; ② the Goodman fatigue life calculation method proposed in this paper can predict the fatigue experimental life of the blade more accurately by considering the mean value.

Key words: wind power blade, flapping fatigue, average stress, fatigue test, cumulative damage, composites

CLC Number:

TB332

FENG Xuebin, WANG Bowen, ZHANG Wenwei, DENG Hang, LIU Penghui. Life prediction method of wind turbine blade flapping fatigue test based on CLD model[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(8): 70-74.

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