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Load-Transfer Capacity and Failure behaviors of crosslinked interfaces in collagen-mimic carbon nanotube bundles

Load-Transfer Capacity and Failure behaviors of crosslinked ...

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中国力学大会-2017暨庆祝中国力学学会成立60周年大会

作者： Min Lin Xiaoyu Sun Wen Xie Zuoqi Zhang School of Civil Engineering Wuhan University Unité Matériaux et Transformations UMR 8207 CNRS/Université Lille1 Suzhou Institute of Wuhan University

Weak interface has been a long-standing bottleneck critically hindering the exploitation of the ultra-high stiffness and strength of carbon nanotubes(CNTs) as reinforcement materials. Recent progress of technologies to introduce strong inter-tube crosslinks in CNT bundles/fibers makes the cross-linked interface design and optimization of highly practical interest. Inspired by the structure of collagen fibril,a covalently cross-linked interface design for ultra-strong CNT bundles has attracted a lot of attentions. In the present paper,molecular dynamics simulations were conducted to systematically study the load-transfer capacity and failure behaviors of the crosslinked interface,including the influence of crosslink type(length),density,and interface length. We found that even a small number of covalent crosslinks are able to significantly enhance the interface in stiffness and strength. Depending on the interface length and crosslink density,the shorter crosslinks usually yield higher interface stiffness while the longer crosslinks generally produce higher interface strength. There are three major failure modes found in the simulations as the crosslink density and interface length increase,namely the abrupt interface failure,the gradual interface failure and the CNT break. A forth failure mode was also unveiled upon a critical and optimal interface design,in which bond breaks propagate simultaneously and gradually in crosslinked interfaces and CNTs. The optimal design is highly desired in engineering applications since it can simultaneously provide superior stiffness,strength and toughness. The current study provides useful guidelines for the interface design of collagen-inspired CNT bundles,in which inter-tube crosslink is a crucial feature for their integrity and extraordinary mechanical properties.

关键词： staggered pattern covalent crosslink bioinspired fiber design

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