Thermo-Mechanical Properties of Carbon Nanotube Yarns with High Energy Dissipation Capabilities

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
César Pérez, Raúl Pech, Hugo Carrillo, Gabriela Uribe, Francis Aviles-Cetina
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引用次数: 4

Abstract

Carbon nanotube yarns (CNTYs) are porous hierarchical fibers which exhibit a strong property-structure relationship. The morphology and structure of dry-spun CNTYs are characterized and correlated with their quasi-static and dynamic mechanical properties. These characterizations include assessment of the CNTY homogeneity by means of Raman spectroscopy mapping, determination of linear density and porosity, atomic force microscopy, and dedicated measurements of the statistical distribution of the yarn's diameter. Tensile testing CNTY yields a specific strength of 0.21–0.34 N/tex, and a specific elastic modulus of 3.59–8.06 N/tex, depending on the gage length. While the strength is weakly sensitive to the gage length, the elastic modulus depends on the gage length. The importance of subtracting the machine compliance for determination of CNTY's elastic modulus is highlighted, since the error can reach up to 28%. Dynamic mechanical analysis shows that the CNTY is a stiff material with an extraordinary high damping ratio, which increases with temperature and reach ~0.6 at 60 °C. In addition, the CNTY presents a frequency-stiffening behavior in the 18–48 Hz range, with storage modulus and loss modulus which increase ~2.5 times and ~7 times, respectively, at 48 Hz.
高耗能碳纳米管纱的热机械性能
碳纳米管纱线(CNTY)是一种多孔的分级纤维,表现出很强的性能-结构关系。表征了干纺CNTY的形态和结构,并将其与准静态和动态力学性能联系起来。这些特征包括通过拉曼光谱图谱、线密度和孔隙率的测定、原子力显微镜以及纱线直径统计分布的专门测量来评估CNTY的均匀性。拉伸测试CNTY的比强度为0.21–0.34 N/tex,比弹性模量为3.59–8.06 N/tex,具体取决于标距长度。虽然强度对标距长度敏感较弱,但弹性模量取决于标距长度。强调了减去机器顺应性对于确定CNTY弹性模量的重要性,因为误差可能高达28%。动态力学分析表明,CNTY是一种具有极高阻尼比的刚性材料,阻尼比随着温度的升高而增加,在60°C时达到~0.6。此外,CNTY在18–48 Hz范围内表现出频率硬化行为,在48 Hz时,储能模量和损耗模量分别增加了约2.5倍和约7倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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