文中探讨了利用偏轴混杂纤维来实现1.5MW风力机叶片主梁弯扭耦合的设计方法,建立了弯扭耦合设计的控制系数,并就碳纤维偏轴角和碳纤维偏轴体积比对弯扭耦合系数的影响进行了分析.理论推导表明弯扭耦合效应只与铺层材料有关.仿真结果表明：采用偏轴混杂纤维梁帽或蒙皮均能达到较好的弯扭耦合性能,且梁帽的最佳设计角在20.0°左右,蒙皮的最佳设计角在13.0°左右;在纤维拉伸和压缩应变、层间切应力、层面Von Mises的约束下,碳纤维偏轴角为20.0°和碳纤维偏轴体积比为45%时的主梁静态性能最优.

This paper deals with the bending-torsion coupling design of the spar cap of 1.5MW wind turbine blade by using biased hybrid fibers.The corresponding control parameters are set,and the effects of both the angle and the volume fraction of off-axis carbon fibers on the bending-torsion coupling parameters are analyzed.Theoretical results indicate that the bending-torsion coupling effect is only related to the laminated materials.Simulated results show that（1） either the biased hybrid spar cap or the skin helps to achieve efficient bending-torsion coupling,with the corresponding optimal angles respectively being about 20.0° and 13.0°;and（2）,under the constraints of fiber tensile and compressive strain,interlaminar shear stress and Von Mises stress on layers,the spar cap is of the most excellent sta-tic performance at a volume fraction of off-axis carbon fibers of 45% and an angle of off-axis carbon fibers of 20°.