摘要
本文概述了风电叶片夹层结构的典型失效模式,通过试验及数值模拟重点研究了壳体夹层结构的面外剪切强度失效和腹板的整体屈曲失效模式。采用工字梁结构型式对腹板上的夹层结构的整体屈曲失效进行了试验和计算分析,试验失效载荷和计算屈曲载荷值偏差小于10%,同时分析夹层面板数量和芯材厚度对腹板屈曲失效的影响,得到芯材厚度是最为有效提高腹板屈曲承载力的方法;最后分析了叶片壳体夹层结构由于承受部分剪切力,易造成夹芯材料的面外剪切强度失效,通过平板夹层结构的四点弯曲的极限及疲劳试验,得到极限及疲劳载荷下的芯材面外剪切强度许用值。
This paper summarizes the typical failure modes of the sandwich structures of wind turbine blade.Through experiments and numerical simulations,the out-of-plane shear strength failure of the shell sandwich structure and the overall buckling failure mode of the web are mainly studied.The I-beam coupons is used to simulate the sandwich structure of the shear-web,its overall buckling failure mode is tested and calculated,the difference between the test failure load and the calculated buckling load is less than 10%.Based on the results,the influence of the number of sandwich panels and the thickness of the core material on the buckling failure of the web is analyzed,it could be found that the thickness of the core material is the most effective method to improve the buckling bearing capacity of the web.The sandwich structure of the blade shell bears part of the shearing force,it is easy to fail due to the out-of-plane shear strength,through the four-point bending test,the allowable shear strength of the out-of-plane core material under the ultimate and fatigue load is obtained,these test results provide powerful design data for blade design.
作者
孔繁晓
周海波
邓航
Fan-xiao Kong;Hai-bo Zhou;Hang Deng(Central South University;Zhuzhou Times New Material Technology Co.,Ltd.)
出处
《风机技术》
2021年第6期76-80,I0002,共6页
Chinese Journal of Turbomachinery
关键词
风机叶片
夹层结构
屈曲失效
面外剪切强度
Wind Turbine Blade
Sandwich Structure
Buckling
Out-of-plane Shear Strength
