Interfacial damping characteristics of carbon nanotube-based composites
Interfacial damping characteristics of carbon nanotube-based composites
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DOI：
10.1016/j.compscitech.2004.06.001
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发表时间：
2004-11
影响因子：
9.1
通讯作者：
Xiao-Hua Zhou;E. Shin;Kon-Well Wang;C. Bakis
中科院分区：
文献类型：
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作者：
Xiao-Hua Zhou;E. Shin;Kon-Well Wang;C. Bakis
由于碳纳米管的超小、纳米尺度尺寸和低密度，其表面积与质量比（比面积）非常大。因此，在基于纳米管的聚合物复合结构中，预计可以通过利用纳米管和聚合物树脂之间的界面摩擦来实现高阻尼。此外，碳纳米管的大宽高比和高弹性模量特性允许设计出组分之间应变差异较大的复合材料，这可以进一步增强界面能量耗散能力。尽管碳纳米管基复合材料具有巨大的工程潜力，但其阻尼性能尚未得到详细的研究。本文旨在研究含单壁碳纳米管（SWNTs）聚合物复合材料的结构阻尼特性，重点分析碳纳米管与树脂材料之间的界面相互作用。该系统采用四相复合材料建模，由树脂、空隙、粘结和脱粘的纳米管组成。提出了描述界面脱粘过程的微观力学模型。为了描述纳米管的整体行为，采用Weibull统计函数来描述单轴载荷下纳米管脱粘的变化概率。为了解决阻尼效应，提出了纳米管和树脂之间界面“粘滑”摩擦运动的概念。将该方法推广到随机取向纳米管复合材料的分析中。分析结果表明，临界剪切应力、纳米管重量比和结构变形是影响阻尼特性的主要因素。实验也验证了分析预测的趋势。通过与纯树脂样品的比较，研究表明，在聚合物树脂中加入碳纳米管填料可以增强阻尼。研究还发现，相较于其他几种类型（不同尺寸、表面积、密度和刚度）的填料，swnt基复合材料可以获得更高的阻尼。这些结果证实了使用碳纳米管增强阻尼的可能优势。
Because of their ultra small, nanometer scale size and low density, the surface area to mass ratio (specific area) of carbon nanotubes (CNTs) is extremely large. Therefore, in a nanotube-based polymeric composite structure, it is anticipated that high damping can be achieved by taking advantage of the interfacial friction between the nanotubes and the polymer resin. In addition, the CNT’s large aspect ratio and high elastic modulus features allow for the design of such composites with large differences in strain between the constituents, which could further enhance the interfacial energy dissipation ability. Despite their wonderful engineering potential, the damping properties of CNT-based composites have not been examined in any detail. The purpose of this paper is to investigate the structural damping characteristics of polymeric composites containing single-walled carbon nanotubes (SWNTs), with a focus on analyzing the interfacial interaction between the CNT and the resin materials. The system is modeled using a four-phase composite, composed of a resin, voids, and bonded and debonded nanotubes. A micromechanical model is proposed to describe interfacial debonding evolution. To characterize the overall behavior, Weibull’s statistical function is employed to describe the varying probability of nanotube debonding under uniaxial loading. To address damping effects, the concept of interfacial “stick-slip” frictional motion between the nanotubes and the resin is proposed. The developed method is extended to analyze composites with randomly oriented nanotubes. The analytical results show that the critical shear stress, nanotube weight ratio and structure deformation are the factors affecting the damping characteristic. Experiments are also performed to verify the trends predicted by the analysis. Through comparing with neat resin specimens, the study shows that one can enhance damping by adding CNT fillers into polymeric resins. It is also observed that SWNT-based composites could achieve higher damping than composites with several other types (different size, surface area, density and stiffness) of fillers. These results confirm the possible advantage of using CNTs for damping enhancement.