中文摘要：

本文通过对一40 m商业风力机叶片进行三维建模和详细的结构铺层,在叶根挥舞极限载荷条件下研究了叶片铺层结构强度。模型重量及模态频率与试验值吻合很好;主梁帽承受较大的载荷;在主梁帽内段及叶根过渡区域纤维失效因子较大,吸力面与压力面纤维失效因子大小与受力规律不一致;主梁帽在叶根过渡处纤维（层）间失效因子较大,主梁帽靠近叶根段表现为C型失效模式,中段表现为B型失效模式,其余大部分位置表现为A型失效模式。

英文摘要：

The strength of composite laminate structure was studied on a 40 meter commercial wind turbine blade under extreme flap case of blade root.A 3-D model and detailed fiber reinforced plastics （FRP） laminate was built to characterize the blade structure.Weight and nature frequencies of blade were perfectly agreeable between computation and test.The main girders undertook the majority of loads.The fibre failure（FF） index was relatively large on inboard section and root-transition of main girders,and the distribution of FF was contrary with stress.The root-transition of main girders revealed large interfibre failure（IFF） index.The majority of main girders predicted failure mode A because of transverse tension and shear,and the middle of girders predicted failure mode B of shear and related transverse compression,and the root of girders predicted failure mode C of transverse compression and related shear.