Mechanical and thermal properties of carbon nanotubes in carbon nanotube fibers under tension–torsion loading. Issue 46 (21st October 2022)

• Record Type: Journal Article
• Authors: Niu, Mowen; Cui, Chongxiao; Tian, Rui; Zhao, Yushun; Miao, Linlin; Hao, Weizhe; Li, Jiaxuan; Sui, Chao; He, Xiaodong; Wang, Chao
• Is Part Of: RSC advances. Volume 12:Issue 46(2022)
• Page Start: 30085
• Page End: 30093
• Publication Date: 2022-10-21
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra05360h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Systematically investigate the mechanical and thermal properties of SWCNT under tension and torsion loadings and provide references for fabricating next-generation super-CNF. Abstract : In carbon nanotube fibers (CNFs) fabricated by spinning methods, it is well-known that the mechanical and thermal performances of CNFs are highly dependent on the mechanical and thermal properties of the inherent CNTs. Furthermore, long CNTs are usually preferred to assemble CNFs because the interaction and entanglement between long CNTs are effectively stronger than between short CNTs. However, in CNFs fabricated using long CNTs, the interior carbon nanotubes (CNTs) inevitably undergo both tension and torsion loading when they are stretched, which would influence the mechanical and thermal performances of CNFs. Here, molecular dynamics (MD) simulations were carried out to study the mechanical and thermal properties of individual CNTs under tension–torsion loading. As for mechanical properties, it was found that both the fracture strength and Young's modulus of CNTs decreased as the twist angle α increased. Besides, step-wise fracture happened due to stress concentration when the twisted CNTs are stretched. On the other hand, it could be seen that the thermal conductivity of CNTs decreased as α increased. This work presents the systematic investigation of the mechanical and thermal properties of CNTs under tension–torsion loading and provides a theoretical guideline for the design and fabrication of CNFs.