A Damage Mechanics Model for Twisted Carbon Nanotube Fibers
Carbon nanotube fibers can be fabricated by the chemical vapor deposition spinning process. They are promising for a wide range of applications such as the building blocks of high-performance composite materials and micro-electrochemical sensors. Mechanical twisting is an effective means of enhancing the mechanical properties of carbon nanotube fibers during fabrication or by post processing. However, the effects of twisting on the mechanical properties remain an unsolved issue. In this paper, we present a two-scale damage mechanics model to quantitatively investigate the effects of twisting on the mechanical properties of carbon nanotube fibers. The numerical results demonstrate that the developed damage mechanics model can effectively describe the elastic and the plastic-like behaviors of carbon nanotube fibers during the tension process. A definite range of twisting which can effectively enhance the mechanical properties of carbon nanotube fiber is given. The results can be used to guide the mechanical twisting of carbon nanotube fibers to improve their properties and help optimize the mechanical performance of carbon nanotube-based materials.
Key wordscarbon nanotube fibers damage twisting multi-level structures elastic modulus
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- Li, Q.W., Li, Y., Zhang, X.F., Chikkannanavar, S.B., Zhao, Y.H., Dangelewicz, A.M., Zheng, L.X., Doorn, S.K., Jia, Q.X., Peterson, D.E., Arendt, P.N. and Zhu, Y.T., Structure-dependent electrical properties of carbon nanotube fibers. Advanced Materials, 2007, 19(20): 3358–3363.CrossRefGoogle Scholar
- Demczyk, B.G., Wang, Y.M., Cumings, J., Hetman, M., Han, W., Zettl, A. and Ritchie, R.O., Direct mechanical measurement of the tensile strength and elastic modulus of multiwalled carbon nanotubes. Materials Science and Engineering a—Structural Materials Properties Microstructure and Processing, 2002, 334(1–2): 173–178.CrossRefGoogle Scholar
- Liew, K.M., Wong, C.H., Tan, M.J. and Chuang, P.D., Non-twisted and twisted CNT bundles under axial tensile and compressive loads. Nanoscience and Technology, Pts 1 and 2, 2007, 121–123: 1415–1418.Google Scholar
- Liu, Y.K., Structures and Mechanical Properties of Carbon Nanotube Yarns by Mechanical Processing and Composite. M.S. Dissertation, Tianjin University, 2009, 33–42 (in Chinese).Google Scholar