Abstract：CNT fibers are composed of millions of highly aligned CNTs. The mechanical properties of CNT fibers when passing through different intensities of currents were investigated experimentally. The experimental results show that the introduction of current can obviously reduce the modulus and breaking strength of the fibers. When the current passes through the fibers, an axial electro-contraction force is produced, the electro-contraction force is increased with the increase of current intensity, the electro-contraction force at 5mA is about 2.5mN. By stretching the fiber to the 2% strain axially, after 1000s of the stress relaxation, the load tends to be stable, then switch on current or increase the current intensity, it is found that the tension of the fiber is obviously decreased due to the decrease of the stress caused by the change of modulus is greater than the increase of electric-contraction force. Stretching the fiber axially to 2% strain when passing through a certain intensity of current, after the stress relaxation, the load tends to be stable, then the same intensity of AC current is passed through, the response of the electro-contraction force is very quick.When the AC current changes experience 400 cycles, electro-contraction force exhibits good change, which makes the CNT-fibers as a new type of electro-actuation material.
刘扶庆, 刘夏, 杨庆生. 碳纳米管纤维力-电耦合效应的实验研究[J]. 材料工程, 2018, 46(9): 31-38.
LIU Fu-qing, LIU Xia, YANG Qing-sheng. Experimental Research on Electro-mechanical Coupling Effects of Carbon Nanotubes Fibers. Journal of Materials Engineering, 2018, 46(9): 31-38.
 LI C, CHOU T W. Vibrational behaviors of multiwalled-carbon-nanotube-based nanomechanical resonators[J]. Applied Physics Letters, 2004, 84(1):121-123.
 JIANG H, YU M F, LIU B, et al. Intrinsic energy loss mechanisms in a cantilevered carbon nanotube beam oscillator[J]. Physical Review Letters, 2004, 93(18):185501.
 刘珍红,孙晓刚,陈珑,等.碳纳米管纸/纳米硅复合电极的锂离子电池性能[J].材料工程,2018,46(1):99-105. LIU Z H,SUN X G,CHEN L,et al. Performance of lithium ion batteries with carbon nanotube paper/nano silicon composite electrode[J].Journal of Materials Engineering,2018,46(1):99-105.
 KIM P, LIEBER C M. Nanotube nanotweezers[J]. Science, 1999, 286(5447):2148.
 余雪平, 兰竹瑶, 邹菁云, 等. 碳纳米管纤维的多功能特性及其驱动应用[J]. 材料导报, 2016, 30(5):132-137. YU X P, LAN Z Y, ZOU J Y, et al. Multifunctionality and actuation application of carbon nanotube fibers[J]. Materials Review, 2016, 30(5):132-137.
 郭文瀚. 基于取向碳纳米管纤维的人工肌肉[D]. 上海:复旦大学, 2013. GUO W H. Artificial muscle based on aligned carbon nanotube fibers[D].Shanghai:Fudan University,2013.
 FOROUGHI J, BAUGHMAN R H. Torsional carbon nanotube artificial muscles[J]. Science, 2011, 334(6055):494-497.
 朱路. 碳纳米管复合纤维超级电容器和太阳能电池[D]. 天津:天津大学, 2010. ZHU L. Carbon nanotube composite fibers for supercapacitors and solar cells[D].Tianjin:Tianjin University,2010.
 ZHAO Z,LI L.Ultrafast nano-oscillators based on interlayer-bridged carbon nanoscrolls[J]. Nanoscale Research Letters, 2011, 6(1):1-11.
 PONCHARAL P, WANG Z L, UGARTE D, et al.Electrostatic deflections and electromechanical resonances of carbon nanotubes[J]. Science, 1999, 283(5407):1513.
 PABLO P J D, HOWELL S, CRITTENDEN S, et al. Correlating the location of structural defects with the electrical failure of multiwalled carbon nanotubes[J]. Applied Physics Letters, 1999, 75(25):3941-3943.
 GUO W L,GUO Y F.Giant axial electrostrictive deformation in carbon nanotubes[J]. Physical Review Letters, 2003, 91(11):115501.
 彭川. 碳纳米管力学行为的分子动力学模拟[D]. 南昌:南昌航空大学, 2012. PENG C. Molecular dynamics simulation study on mechanical behaviors of carbon nanotubes[D]. Nanchang:Nanchang Hangkong University,2012.
 LI C Y, CHOU T W. Charge-induced strains in single-walled carbon nanotubes[J]. Nanotechnology, 2006, 17(18):4624-4628.
 GUO Y F, GUO W L. Mechanical and electrostatic properties of carbon nanotubes under tensile loading and electric field[J]. Journal of Physics D-Applied Physics, 2003, 36(7):805.
 杜娟, 李宪洲, 田宏伟,等. 碳纳米管最新性质-光学相关性[J].材料工程, 2006(增刊1):501-502. DU J,LI X Z,TIAN H W, et al. Newest property in carbon nanotube-correlation of optics[J].Journal of Materials Engineering,2006(Suppl 1):501-502.
 GUO W, LIU C, ZHAO F, et al. A novel electromechanical actuation mechanism of a carbon nanotube fiber[J]. Advanced Materials, 2012, 24(39):5379-5384.
 SHANG Y, HE X, WANG C, et al. Large-deformation, multifunctional artificial muscles based on single-walled carbon nanotube yarns[J]. Advanced Engineering Materials, 2015, 17(1):14-20.
 MENG F, ZHANG X, LI R, et al. Electro-induced mechanical and thermal responses of carbon nanotube fibers[J]. Advanced Materials, 2014, 26(16):2480-2485.
 MENG F, WANG M, LU W, et al. An electromechanical behavior of reduced graphene oxide fiber[J]. Carbon, 2016, 105:244-247.
 BAUGHMAN R H. Playing nature's game with artificial muscles[J]. Science, 2005, 308(5718):63.
 SU R S, CHANG K L, SO I, et al. DNA-wrapped single-walled carbon nanotube hybrid fibers for supercapacitors and artificial muscles[M]. Faculty of Engineering-Papers (Archive), 2008:466-470.