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Title: Failure mechanisms of carbon nanotube fibers under different strain rates
Authors: Zhang, Yani
Zheng, Lianxi
Sun, Gengzhi
Zhan, Zhaoyao
Liao, Kin
Issue Date: 2012
Source: Zhang, Y., Zheng, L., Sun, G., Zhan, Z., & Liao, K. (2012). Failure mechanisms of carbon nanotube fibers under different strain rates. Carbon, 50(8), 2887-2893.
Series/Report no.: Carbon
Abstract: Strong and uniform carbon nanotube (CNT) fibers with tensile strength around 1.2 GPa were prepared from vertically aligned CNT arrays, and their mechanical properties were studied using a wide range of tensile strain rates. The cyclic load/unload process, polarized Raman measurements, and fiber fracture surfaces were also used to study the failure mechanism of the CNT fibers. It is found that the fibers exhibit a strain-rate strengthening effect, and have different failure mechanisms at high and low strain rates. The key factors that limit the mechanical properties of the CNT fibers were then investigated based on a failure mechanism analysis: inter-tube slippage happens at low strain-rates, and “cascade-like” breaking dominates at high strain-rates. The maximum strength of the fibers appears at high strain rates, and is mainly determined by the CNT alignment.
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2012.02.057
Rights: © 2012 Elsevier Ltd.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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