Abstract
The multi-scale deformation and interfacial mechanical behavior of carbon nanotube fibers with multi-level structures are investigated by experimental and theoretical methods. Multi-scale experiments including uniaxial tensile testing, in situ Raman spectroscopy, and scanning electron microscopy are conducted to measure the mechanical response of multi-level structures within the fiber under tension. A two-level interfacial mechanical model is then presented to analyze the interfacial bonding strength of mesoscopic bundles and microscopic nanotubes. The evolution characteristics of multi-scale deformation of the fiber are described based on experimental characterization and interfacial strength analysis. The strengthening mechanism of the fiber is further studied. Comprehensive analysis shows that the property of multi-level interfaces is a critical factor for the fiber strength and toughness. Finally, the method of improving the mechanical properties of fiber-based materials is discussed. The result can be used to guide multi-level interface engineering of carbon nanotube fibers and fiber-based composites to produce high performance materials.
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Acknowledgments
The authors acknowledge the financial support of this work provided by the National Basic Research Program of China (No. 2012CB937500), the National Natural Science Foundation of China (No. 11002097), and the Key Grant of Chinese Ministry of Education (No.309010).
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Deng, WL., Qiu, W., Li, Q. et al. Multi-Scale Experiments and Interfacial Mechanical Modeling of Carbon Nanotube Fiber. Exp Mech 54, 3–10 (2014). https://doi.org/10.1007/s11340-012-9706-1
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DOI: https://doi.org/10.1007/s11340-012-9706-1