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复合材料的可设计性为通过弹性剪裁来获得想要的变形模式带来了优势,其结构的耦合特性如拉扭耦合和弯扭耦合可以利用复合材料的各向异性来实现。以薄壁壳结构力学理论为基础,采用多种理论方法研究分析正交各向异性壳体本构关系,给出适合复合材料层压板矩形闭剖面薄壁梁截面的刚度系数解析表达;采用逐阶近似方法,完整设计复杂闭剖面的刚度系数数值算法;针对两种典型的复合材料铺层的矩形闭剖面梁截面布局构型,进行刚度特性的计算分析与讨论,获得铺层角度对复合材料薄壁梁弯曲、扭转及弯扭耦合刚度特性的定量结果。对分析设计闭剖面薄壁结构刚度条件具有应用价值。
The designability of composite materials offers the advantage of obtaining the desired deformation mode by elastic tailoring. The structural coupling properties such as torsional-torsional coupling and torsional-torsional-torsional coupling can be achieved by the anisotropy of composite materials. Based on the mechanics theory of thin-walled shell, the constitutive relation of the orthotropic shell was studied and analyzed by a variety of theoretical methods, and the stiffness coefficient of the thin-walled beam with rectangular closed section was obtained. The hierarchical approximation Method and numerical calculation method of the stiffness coefficient of a fully-designed closed section are proposed. According to the cross-sectional configuration of two typical rectangular cross-section beams with composite material, the stiffness characteristics are calculated and discussed. The effect of the ply angle on the bending of the composite thin- , Torsion and bending and torsional coupling stiffness characteristics of the quantitative results. It has the application value for analyzing the stiffness of closed-section thin-walled structures.