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stiffness degradation modeling for Composite Wind Turbine Blades Based on Full-Scale Fatigue Testing

Journal of Beijing Institute of Technology 2023年第4期32卷 517-528页

作者： Haixia Kou Kongyuan Wei Yanhu Liu Xuyao Zhang School of Mechanical Engineering Lanzhou JiaoTong UniversityLanzhou 730070China School of Mechatronics Engineering Lanzhou University of TechnologyLanzhou 730050China School of New Energy and Power Engineering Lanzhou JiaoTong UniversityLanzhou 730070China

In order to provide more insights into the damage propagation composite wind turbine blades(blade)under cyclic fatigue loading,a stiffness degradation model for blade is proposed based on the full-scale fatigue testing of a blade.A novel non-linear fatigue damage accumulation model is proposed using the damage assessment theories of composite laminates for the first ***,a stiffness degradation model is established based on the correlation of fatigue damage and residual stiffness of the composite ***,a stiffness degradation model for the blade is presented based on the full-scale fatigue *** scientific rationale of the proposed stiffness model of blade is verified by using full-scale fatigue test data of blade with a total length of 52.5 *** results indicate that the proposed stiffness degradation model of the blade agrees well with the fatigue testing results of this *** work provides a basis for evaluating the fatigue damage and lifetime of blade under cyclic fatigue loading.

关键词： composite wind turbine blades fatigue damage stiffness degradation model full-scale fatigue testing

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Fatigue behavior of basalt-aramid and basalt-carbon hybrid fiber reinforced polymer sheets

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Journal of Southeast University(English Edition) 2013年第1期29卷 84-87页

作者：潘建伍吴刚袁希贵南京航空航天大学土木工程系南京210016 东南大学土木工程学院南京210096

In order to study the fatigue failure mode and fatigue life laws of basalt-aramid and basalt-carbon hybrid fiber reinforced polymer （ FRP ） sheets, fatigue experiments are carried out, considering two hybrid ratios of 1 ： 1 and 2：1 under different stress levels from 0.6 to 0.95. The results show that fractures occur first in carbon fibers or aramid fibers for the specimens with hybrid ratio of 1： 1, namely B1A1 and B1C1, while a fracture occurs first in basalt fibers for the specimens with a hybrid ratio of 2： 1, namely B2A1 and B2C1. The fatigue lives of the hybrid FRP sheets increase with the improvement of the content of carbon fibers or aramid fibers, and the influence of the carbon fibers content improvement to fatigue life is more significant. The fatigue performance of B2A1 is relatively worse, while the fatigue performance of B1C1 and B2C1 is relatively better. Finally, a new fatigue stiffness degradation model with dual variables and double inflection points is presented, which is applicable to both hybrid and normal FRP sheets.

关键词： hybrid fiber reinforced polymer sheet basalt-aramid basalt-carbon fatigue experiment stiffness degradation model

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