Dynamic response and simulations of nanoparticle-enhanced composites
Dynamic response and simulations of nanoparticle-enhanced composites
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DOI：
10.1016/j.compscitech.2008.02.035
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发表时间：
2009-05
影响因子：
9.1
通讯作者：
P. Mantena;A. Al-ostaz;A. Cheng
中科院分区：
文献类型：
--
作者：
P. Mantena;A. Al-ostaz;A. Cheng
研究了纳米颗粒增强复合材料和粉煤灰基阻燃结构泡沫材料的动态弹性模量和阻尼力、低速冲击和高应变(霍普金森杆)响应。用分子动力学(MD)模拟得到了单壁和多壁碳纳米管(MWCNT)增强不同基体的弹性常数。给出了尼龙6，6与MWCNT、乙烯基酯与纳米粘土和石墨片以及Eco-Core®泡沫塑料的动态和冲击响应的实验结果，以及一些来自分子模拟的预测。多壁碳纳米管的加入增加了尼龙6，6的动态弹性模量和阻尼边际下降。MWCNT的加入不利于低速冲击下的最大载荷和能量吸收。然而，在压缩载荷下的高应变率下，使用Hopkinson压杆装置可以观察到强度和能量吸收的改善。分子模拟结果表明，多壁碳纳米管是横向各向同性的，横向性能较差。
The dynamic modulus and damping, low-velocity impact and high-strain (Hopkinson bar) response of nanoparticle-enhanced composites and fly ash based fire resistant structural foams have been characterized. Molecular Dynamic (MD) simulations were also used for obtaining the elastic constants for different matrices reinforced with single and multi-wall carbon nanotubes (MWCNT). Experimental results on the dynamic and impact response of nylon 6,6 with MWCNT, vinyl ester with nanoclay and graphite platelets, and Eco-Core®foams are presented; along with some of the predictions from molecular simulations. An increase in dynamic modulus and marginal drop in damping was observed with the addition of multi-wall carbon nanotubes to pristine nylon 6,6. Addition of MWCNT was detrimental to the maximum load and energy absorption under low-velocity impact. However, an improvement in strength and energy absorption was observed with Hopkinson pressure bar apparatus at high-strain rates under compressive loading. Results obtained from molecular simulations show that MWCNTs are transversely isotropic, and the transverse properties are comparatively poor.