GFRP风电叶片段结构强度三维有限元分析

Three-dimensional finite element analysis of the structural strength of GFRP wind turbine blade segment

叶片结构强度是决定风电机组寿命和全寿命周期度电成本的关键因素。本文选取美国SNL 100m玻璃纤维增强树脂复合材料(GFRP)风电叶片,根据关键截面的几何和复合材料铺层构造建立了叶片段三维有限元实体模型。分析了叶片段结构的非线性屈曲、胶接界面脱粘及复合材料失效的耦合行为。结果表明:挥舞载荷下叶片段首先出现复合材料失效,然后是胶接界面脱粘,最后出现结构胶失效;而摆振载荷下,叶片段最先出现非线性屈曲,接着依次出现复合材料失效、胶接脱粘和结构胶失效,且尾缘屈曲形变是胶接脱粘的驱动因素。

The structual strength of blades is a significant factor of the safety of wind turbines and the levelised cost of energy.A three-dimentional finite element model was built to investigate the strength of blade segment,which inherited the geometrical and laminate cross-sectional characteristics of American SNL 100 mglass fiber reinforced polymer composites(GFRP)blade at critical span location.The coupling behaviors of nonlinear buckling,adhesive debonding and composite failure were jointly studied.The results indicate that composite of blade segment fails firstly,then the adhesive debonds,and the adhesive breaks finally under the flap-wise load.Nonlinear buckling initiates firstly,then the composite fails and adhesive debonds,and the adhesive breaks finally under the edge-wise load,which implies that the adhesive debonding at trailing edge is triggered by the buckling deformation.