Nonlinear low-velocity impact analysis of temperature-dependent nanotube-reinforced composite plates
Nonlinear low-velocity impact analysis of temperature-dependent nanotube-reinforced composite plates
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DOI：
10.1016/j.compstruct.2013.09.024
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发表时间：
2014-02
影响因子：
6.3
通讯作者：
Zhen-xin Wang;Jifeng Xu;P. Qiao
中科院分区：
文献类型：
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作者：
Zhen-xin Wang;Jifeng Xu;P. Qiao
研究了碳纳米管增强复合材料（CNTRC）结构在热冲击下的非线性响应。两个板配置（即，单层和夹层板），并且纳米管增强在板厚度方向上均匀分布或功能分级。纳米管增强复合材料的材料性能估计使用细观力学模型。运动方程是基于高阶剪切变形理论与von Kármán型的运动非线性，和热效应包括考虑纳米管增强复合材料的温度依赖性。采用两步摄动法求解运动方程，并引入由热载荷或面内边缘载荷引起的初应力作为面内边界条件。讨论了材料性能梯度、体积分数分布、温度变化、初始应力、冲击器初始速度、芯-面板厚度比等因素对板结构冲击响应的影响。所提出的分析可以帮助更好地理解功能梯度材料的非线性冲击响应，并促进纳米复合材料结构的设计和优化，以抵抗冲击和在热环境和其他环境下。
A nonlinear analysis is presented for impact response of carbon nanotube-reinforced composite (CNTRC) structures under thermal conditions. Two plate configurations (i.e., single-layer and sandwich plates) are considered, and the nanotube reinforcement is either uniformly-distributed or functionally-graded in the plate thickness direction. The material properties of nanotube reinforced composites are estimated using micromechanical models. The equations of motion are based on a higher-order shear deformation theory with a von Kármán-type of kinematic nonlinearity, and the thermal effects are included by considering the nanotube reinforced composites as temperature-dependent. The equations of motion are solved with a two-step perturbation technique, and the initial stresses caused by either the thermal or in-plane edge loads as in-plane boundary conditions are introduced. The influences of material property gradient, volume fraction distribution, temperature change, initial stress, initial velocity of the impactor, and core-to-face sheet thickness ratio on impact response of plate structures are discussed. The analysis presented can help better understand the nonlinear impact response of functionally-graded materials and facilitate design and optimization of nanocomposite structures against impact and under thermal and other environments.