含温湿效应的复合材料风机叶片的破坏

Failure of composite wind turbine blade with hydrothermal effects

针对复合材料风机叶片在温湿环境下的早期失效问题,采用有限元数值模拟方法研究了考虑了风载荷和温湿载荷共同作用下叶片的逐步破坏行为和破坏机理。将风机叶片简化为悬臂梁模型,进行了三维建模,对蒙皮、腹板和主梁均采用板壳单元进行离散,分别讨论了在不同温度及湿度条件下,环境因素对复合材料风机叶片材料性能的影响,并分析了叶片刚度、强度的变化及破坏情况。同时引入基于应变分布的三维Hashin失效准则,利用有限元分析软件ABAQUS对风机叶片进行刚度和破坏分析,讨论了风载下复合材料风机叶片的逐步破坏行为以及温湿载荷对风机叶片强度和刚度的影响。分析结果表明,高温湿润的环境对复合材料风机叶片材料性能影响很大,导致叶片的强度和刚度均有不同程度的降低。

The gradual failure and failure mechanism of composite wind turbine blade applied to wind load and temperature-humidity load were studied by finite element numerical simulation for the early failure at different temperature and humidity.The wind turbine blade was reduced to cantilever model and the three-dimension model was conducted.The skin, web plate and the main beam were discrete by composite plate element.The three-dimension Hashin failure criterion of strain distribution was adopted for failure analysis.The stiffness and failure behavior of the wind blade structure were studied by using FEA software ABAQUS.The gradual failure and the effects on strength and stiffness of composite wind turbine blade were discussed under temperature and humidity load.The effects of hydrothermal of environment on material properties were widely obvious, which lead to the decrease of strength and stiffness of composite wind turbine.