Postbuckling of nanotube-reinforced composite cylindrical shells in thermal environments, Part I: Axially-loaded shells
Postbuckling of nanotube-reinforced composite cylindrical shells in thermal environments, Part I: Axially-loaded shells
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DOI：
10.1016/j.compstruct.2011.02.011
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发表时间：
2011-07
影响因子：
6.3
通讯作者：
Hui‐Shen Shen
中科院分区：
文献类型：
--
作者：
Hui‐Shen Shen
对单壁碳纳米管（SWCNTs）增强的纳米复合材料圆柱壳在热环境中轴向压缩时的后屈曲问题进行了分析。研究了两种碳纳米管增强复合材料（CNTRC）壳体，即均匀分布（UD）和功能梯度（FG）增强体。FG-CNTRC的材料性能被假定为在厚度方向上是渐变的，并且通过细观力学模型来估计。控制方程是基于高阶剪切变形理论与冯卡门型的运动非线性。热效应也被包括在内，并假定CNTRC的材料特性是温度依赖的。采用奇异摄动法确定屈曲载荷和后屈曲平衡路径。数值例子关注轴向加载，完善和不完善，FG-CNTRC圆柱壳在不同的热环境条件下的后屈曲行为。UD-CNTRC壳的结果，这是在本研究中的一个特殊情况下，与FG-CNTRC壳的结果进行了比较。结果表明，线性功能梯度筋能提高轴压壳体的屈曲载荷和屈曲后强度。结果表明，碳纳米管的体积分数有显着的CNTRC壳的屈曲载荷和后屈曲行为的影响。
A postbuckling analysis is presented for nanocomposite cylindrical shells reinforced by single-walled carbon nanotubes (SWCNTs) subjected to axial compression in thermal environments. Two kinds of carbon nanotube-reinforced composite (CNTRC) shells, namely, uniformly distributed (UD) and functionally graded (FG) reinforcements, are considered. The material properties of FG-CNTRCs are assumed to be graded in the thickness direction, and are estimated through a micromechanical model. The governing equations are based on a higher order shear deformation theory with a von Kármán-type of kinematic nonlinearity. The thermal effects are also included and the material properties of CNTRCs are assumed to be temperature-dependent. A singular perturbation technique is employed to determine the buckling loads and postbuckling equilibrium paths. The numerical illustrations concern the postbuckling behavior of axially-loaded, perfect and imperfect, FG-CNTRC cylindrical shells under different sets of thermal environmental conditions. The results for UD-CNTRC shell, which is a special case in the present study, are compared with those of the FG-CNTRC shell. The results show that the linear functionally graded reinforcements can increase the buckling load as well as postbuckling strength of the shell under axial compression. The results reveal that the CNT volume fraction has a significant effect on the buckling load and postbuckling behavior of CNTRC shells.