Abstract Axial electromechanical properties after transverse compression of carbon nanotube (CNT) fibers were studied for their potential application in constructing lightweight structures. The structure-property relationship under two different compression modes was revealed due to their unique mechanical and electrical properties. Change of disentanglements and slippage between CNTs or CNT bundles during transverse compression significantly altered the axial tensile performance. The axial tensile strength of aerogel-spun and dry-spun CNT fibers increased by 20.6% and 11.9 % under individually compressed at 60 MPa and 90 MPa, respectively. The tensile moduli of both fibers increased by 0.05 GPa. Followed by reduction of tensile performance as compressive strain level increased. The corresponding electrical resistance of both deformed CNT fibers increased more rapidly than that of the uncompressed fibers. In the cyclic compression mode, the axial tensile strength and modulus decreased by 40% and 45.7% for the aerogel-spun CNT fibers and by 17% and 14.2% for dry-spun CNT fibers owing to permanent damage accumulation. Scanning electron microscope examinations showed that tensile failure mode after compression transitioned from slippage into a new mode based on the fracture of CNT bundles. The failure mechanisms were finally investigated by a theoretical model.

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横向压缩对碳纳米管纤维轴向机电性能的影响

摘要 研究了碳纳米管 (CNT) 纤维横向压缩后的轴向机电性能，以研究其在构建轻质结构方面的潜在应用。由于其独特的机械和电学性能，揭示了两种不同压缩模式下的结构-性能关系。横向压缩过程中碳纳米管或碳​​纳米管束之间解缠结和滑动的变化显着改变了轴向拉伸性能。在 60 MPa 和 90 MPa 的单独压缩下，气凝胶纺和干纺 CNT 纤维的轴向拉伸强度分别增加了 20.6% 和 11.9%。两种纤维的拉伸模量均增加了 0.05 GPa。随着压缩应变水平的增加，拉伸性能随之降低。两种变形的 CNT 纤维的相应电阻比未压缩的纤维增加得更快。在循环压缩模式下，由于永久性损伤累积，气凝胶纺制的 CNT 纤维的轴向拉伸强度和模量分别降低了 40% 和 45.7%，干纺 CNT 纤维的轴向拉伸强度和模量分别降低了 17% 和 14.2%。扫描电子显微镜检查表明，压缩后的拉伸破坏模式从滑动转变为基于 CNT 束断裂的新模式。最后通过理论模型研究了失效机制。由于永久性损伤累积，干纺 CNT 纤维为 2%。扫描电子显微镜检查表明，压缩后的拉伸破坏模式从滑动转变为基于 CNT 束断裂的新模式。最后通过理论模型研究了失效机制。由于永久性损伤累积，干纺 CNT 纤维为 2%。扫描电子显微镜检查表明，压缩后的拉伸破坏模式从滑动转变为基于 CNT 束断裂的新模式。最后通过理论模型研究了失效机制。