复合材料板弯扭耦合特性数值模拟

Numerical simulation of bend-twist coupling properties of laminate plates

为研究复合材料风机叶片弯扭耦合特性,将风机叶片简化为对称非均匀复合材料层合板,研究不同的耦合区域对弯扭耦合效应的影响.在复合材料层合板不同区域对称铺设相同纤维角度的增强板,分析在集中静力荷载作用下,层合板的静态弯扭耦合特性;结合模态分析方法,利用模态置信准则(MAC),定量分析不同位置耦合层合板的弯扭耦合动态效应.结果表明,在低阶模态时,中部区域耦合板耦合效果明显,端部耦合板在高阶模态时弯扭耦合效果更明显.

In order to analyze the effect of bend twist coupling(BTC) of large wind turbine blade, the blade was simplified to a symmetric un-uniform laminate plates, the influence of coupling area on bend-twist coupling effect was studied by numerical analysis method. By introducing symmetric off-axis orientations in different locations of the five plates, the static deformations to perform the coupling feature were analyzed under the concentrated force. A new method was proposed in this paper to quantitatively describe the bending-torsional coupling performance of laminates using modal assurance criterior(MAC). The results show that coupling effect of laminates coupled in the central region were significant at low-order vibrations, while the coupling effect of laminates coupled near the end was more obvious at higher-order modes.