基于模态缺陷的变刚度复合材料圆柱壳屈曲特性  

Buckling performance of variable stiffness composite cylindrical shells based on mode imperfections

作　　者：卫宇璇 张明[2] 刘佳 刘硕 路明雨 王洪雨 WEI Yu-xuan;ZHANG Ming;LIU Jia;LIU Shuo;LU Ming-yu;WANG Hong-yu(Beijing Satellite Manufacturing Factory Co.,Ltd,Beijing 100094,China;China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]北京卫星制造厂有限公司,北京100094 [2]中国空间技术研究院,北京100094

出　　处：《吉林大学学报（工学版）》2022年第1期91-100,共10页Journal of Jilin University:Engineering and Technology Edition

基　　金：装备预研共用技术项目(41422060101).

摘　　要：研究了基于自动铺丝技术的变刚度复合材料圆柱壳的屈曲性能和缺陷敏感性。基于丝束剪切/重送技术,提出了可以精确模拟圆柱壳面内重叠/间隙区域的简便算法,使有限元模型更加贴近实际制造过程。开展了复合载荷作用下曲线纤维铺层方式对圆柱壳屈曲性能影响的研究,结合Kriging模型和遗传算法,对纤维角度沿环向和轴向线性变化的铺层设计方式进行了优化。最后,利用改进弧长法对不同模态缺陷条件下变刚度复合材料圆柱壳的缺陷敏感性进行了分析。结果表明:在轴压和均匀外压复合作用下,纤维角度沿轴向变化的铺层方式可以有效提高结构的屈曲性能。当带宽为25.4 mm、T_(0)=80、T_(1)=45时变刚度圆柱壳的屈曲性能最优,较基准构型和常刚度最优构型临界屈曲载荷分别提高了70.9%和34.5%。变刚度圆柱壳的抗缺陷敏感性较基准铺层方式和最优常刚度铺层方式得到了提升。因此,变刚度设计可以使复合载荷作用下的圆柱壳结构在提升结构抗屈曲性能的同时降低对几何缺陷的敏感性。The buckling performance and imperfection sensitivity of variable stiffness cylindrical shells based on automatic placement technology are studied.Based on the tow shearing/refeeding technology,a simple algorithm that can accurately simulate the overlapping or defect area of the cylindrical shell surface is proposed to make the finite element model closer to the actual structure.A study was conducted on the effect of curved fiber layup on the buckling performance of cylindrical shells under combined loads.Combined with the Kriging model and genetic algorithm,the layup design method,in which the fiber angle changes linearly along the hoop direction and the axial direction,is optimized.The modified arc length method was used to analyze the imperfection sensitivity of composite stiffened cylindrical shells with different mode imperfections.The results show that under the combined action of axial pressure and uniform external pressure,the layering method,in which the fiber angle changes along the axial direction,can effectively improve the buckling performance of the structure.When the bandwidth is 25.4 mm,T_(0)=80,T_(1)=45,the buckling performance of the variable stiffness cylindrical shell is optimal,and the critical buckling load is increased by 70.9%and 34.5%compared to the reference configuration and to the constant stiffness optimal configuration.The imperfection sensitivity of the variable stiffness cylindrical shell is also improved compared to the quasi-isotropic layering method and to the optimal constant stiffness layering method.Variable stiffness design can make the cylindrical shell structure under combined load improve the structural buckling resistance and reduce the sensitivity to geometric imperfections.

关 键 词：复合材料 变刚度 屈曲特性 模态缺陷 缺陷敏感性 

分 类 号：TB332[一般工业技术—材料科学与工程]