极限载荷作用下风力机叶片跨尺度分析

Cross-scale Analysis of Wind Turbine Blades under Ultimate Load

跨尺度分析是风力机叶片力学性能研究的重要方法,首先对风力机叶片在极限载荷作用下进行有限元分析;然后结合最大正应力准则及桥联模型将叶片的宏观响应传递到细观模型,对叶片进行细观失效分析;最后依据Tsai-Wu失效准则和层合板理论将细观材料强度转换为宏观层合板强度,对叶片进行宏观失效分析。仿真与理论的结果表明:根据该方法可以判断风力机叶片在不同尺度下是否出现失效以及出现的失效形式;同时可以完成跨尺度的材料强度预测,对风力机叶片的失效预测具有重要的工程价值。

Cross-scale analysis is an important method to study the mechanical properties of wind turbine blades.The finite element analysis of wind turbine blades under ultimate load is carried out.Combined with the maximum normal stress criterion and bridging model,the macro response of the blade is transferred to the meso model to analyze the meso failure of the blade.According to Tsai-Wu failure criterion and laminate theory,the meso material strength is transformed into macro laminate strength,and the macro failure analysis of the blade is carried out.The simulation and theoretical results show that we can judge whether the wind turbine blade has failure and the failure form under different scales according to this method.It can complete the cross-scale material strength prediction,which has important engineering value for the failure prediction of wind turbine blades.