Critical buckling temperature and force in porous sandwich plates with CNT-reinforced nanocomposite layers
Critical buckling temperature and force in porous sandwich plates with CNT-reinforced nanocomposite layers
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DOI：
10.1016/j.ast.2019.05.020
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发表时间：
2019-08
影响因子：
5.6
通讯作者：
B. Safaei;R. Moradi‐Dastjerdi;K. Behdinan;F. Chu
中科院分区：
文献类型：
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作者：
B. Safaei;R. Moradi‐Dastjerdi;K. Behdinan;F. Chu
本文研究了双参数弹性地基上含均匀分布（UD）孔的轻质聚合物纳米复合材料夹层板的热屈曲和力学屈曲行为。建议的夹层板的外层被假定为由功能梯度（FG）碳纳米管（CNT）增强的聚合物纳米复合材料。对于纳米复合层，考虑了随机取向的CNT的簇形成的相当大的影响，并且通过Eshelby-Mori-Tanaka（EMT）的具有簇状态定义的方法来评估材料性质。在此基础上，利用板的一阶和三阶剪切变形理论（FSDT和TSDT）定义了夹层板的总能量函数。采用无网格法简化了屈曲控制方程。探讨了孔隙率、纳米填料特性、弹性地基系数、夹层板尺寸和边界条件对屈曲行为的影响。研究结果表明，多孔夹层板的热屈曲行为得到了显著改善，但同时也降低了夹层板的临界载荷。此外，添加碳纳米管到外层同时提高夹层板的机械和热屈曲响应。
This paper presents the thermal and mechanical buckling behaviors of lightweight polymeric nanocomposite sandwich plates containing uniformly dispersed (UD) pores resting on two-parameter elastic foundations. The outer layers of the proposed sandwich plates were assumed to be made of functionally graded (FG) carbon nanotube (CNT)-reinforced polymeric nanocomposite. For nanocomposite layers, the considerable effect of cluster formation of randomly-oriented CNTs was considered and material properties were evaluated through Eshelby-Mori-Tanaka (EMT)'s approach with the definition of cluster state. Furthermore, the first and third order shear deformation theories (FSDT and TSDT) of plates were employed to define the total energy function of sandwich plates. The governed buckling equations were facilitated using a mesh-free method. The effects of porosity, nanofiller characterizations, elastic foundation coefficients, sandwich plate dimensions and boundary conditions on buckling behavior were explored. The obtained results showed that porosity considerably improved thermal buckling behavior; however, it reduced the critical mechanical loads of sandwich plates. Moreover, adding CNTs into outer layers simultaneously improved the mechanical and thermal buckling responses of sandwich plates.