| 薛晓,乔禹,王鹏飞*,徐松林.碳纳米管纤维的动态拉伸力学性能研究[J].实验力学,2020,35(5):811~819 |
| 碳纳米管纤维的动态拉伸力学性能研究 |
| Dynamic tensile mechanical properties of carbon nanotube fiber |
| 投稿时间：2019-11-13 修订日期：2020-02-18 |
| DOI：10.7520/1001-4888-19-213 |
| 中文关键词: 动态拉伸 碳纳米管纤维 应变率效应 局部损伤 |
| 英文关键词:dynamic tensile carbon nanotube fiber strain rate effect local damage |
| 基金项目:国家自然科学基金(11872361，11602267, 11672286)；中央高校基本科研业务费专项资金(WK 2090050040, WK2480000003) |
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| 中文摘要: |
| 单根微米直径的纤维所能承受的力很微弱，传统的Hopkinson杆实验技术难以检测其透射波信号，造成实验数据无法处理等问题。本文利用高精度的压电传感器代替透射杆获取纤维试样的受力信号，结合入射杆上的入射波信号，形成获取纤维应力-应变曲线的技术，并通过ABAQUS有限元模拟，结果表明该装置具有良好的精度和稳定性。基于此，对直径为200μm的碳纳米管纤维进行动态拉伸测试，结合准静态拉伸实验结果和纤维断口的形貌特征，分析了碳纳米管纤维的应变率效应和拉伸破坏机制；并通过检测双股碳纳米管纤维的断裂结果，分析了纤维的多层级局部损伤作用。 |
| 英文摘要: |
| Since the strength of single-fiber with micron diameter was really lower, it was difficult to measure the transmitted wave signal and to obtain valuable experimental data with the traditional SHPB technology. A high-precision piezoelectric sensor was employed in the present study to measure the stress signals of single-fiber specimen instead of the transmission bar, and an experimental technique for determination of stress-strain curves of fiber was then established by combing the incident wave signal with the stress signals. Good accuracy and data stability of testing system were proved by the ABAQUS finite element simulation. Based on the testing system, the dynamic tensile behaviors of carbon nanotube fiber with a diameter of 200μm was investigated, and the strain rate effect and tensile failure mechanism of carbon nanotube fiber were analyzed based on the quasi-static tensile test results as well as the morphology characteristics of the fiber fracture. In addition, the multilevel local damage of CNT fiber was analyzed by detecting the fracture process of the double-stranded carbon nanotube fiber. |
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