温度对碳纳米管增强纳米蜂窝镍力学性能的影响

doi:10.11900/0412.1961.2019.00299

金属学报

2020, Vol. 56

Issue (5): 785-794 DOI: 10.11900/0412.1961.2019.00299

本期目录 | 过刊浏览

温度对碳纳米管增强纳米蜂窝镍力学性能的影响

李源才, 江五贵(

), 周宇

南昌航空大学航空制造工程学院南昌 330063

Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs

LI Yuancai, JIANG Wugui(

), ZHOU Yu

School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China

引用本文:

李源才, 江五贵, 周宇. 温度对碳纳米管增强纳米蜂窝镍力学性能的影响[J]. 金属学报, 2020, 56(5): 785-794.
Yuancai LI, Wugui JIANG, Yu ZHOU. Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs[J]. Acta Metall Sin, 2020, 56(5): 785-794.

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摘要:

选取含质量分数为5.22‰碳纳米管(CNT)为代表，通过分子动力学(MD)研究了温度对纳米蜂窝镍(NNHC)和CNT增强纳米蜂窝镍(CRNNHC)在径向拉伸、径向压缩、轴向拉伸和轴向压缩下力学性能的影响。结果表明，NNHC和CRNNHC的弹性模量(E)和最终应力(σ_u)对温度较为敏感，都随温度升高呈近似线性下降。相比于NNHC，不同温度下CNT的添加对CRNNHC径向力学性能的增强效果并不明显，而对其轴向力学性能则起到了良好的增强作用。CRNNHC轴向拉伸与压缩时的弹性模量提升幅值分别为6.4%~10%与9%~12%，最终应力提升幅值分别为1.5%~5.3%与10%~14%。研究表明，不同温度下CRNNHC沿轴向变形的力学性能普遍要优于沿径向变形的力学性能，也预示着轴向变形时CNT被破坏前吸收的能量相对较多。

关键词 ：纳米蜂窝镍, 碳纳米管增强纳米蜂窝镍, 力学性能, 分子动力学, 温度效应

Abstract：

Nickel nano-honeycombs (NNHC) would be expected to an ideal anode material for solid oxide fuel cells (SOFC) because of its high surface area and highly ordered pore network. But, the anode material requires excellent mechanical properties to withstand stresses that arise during processing and service at different temperatures. The influence of temperature on the mechanical behaviors under radial (y axis) tension, radial compression, axial (z axis) tension and axial compression, is investigated by molecular dynamics (MD) by taking the carbon nanotubes (CNT)-reinforced NNHC (CRNNHC) composites with the mass fractions of CNT (ω_CNT) of 5.22‰ and its corresponding NNHC as the example. The results show that the mechanical properties including elastic modulus(E) and ultimate stress (σ_u)in NNHC and CRNNHC both decrease approximately linearly with the increase of temperature. Compared to NNHC, the addition of CNT has no obvious effect on the enhancement of radial mechanical properties of CRNNHC under different temperatures, but it results in a good reinforced effect on axial mechanical properties. While the axial tensile and compressive elastic moduli can be increased by 6.4%~10% and 9%~12% respectively, and the ultimate stress can be increased by 1.5%~5.3% and 10%~14% respectively. The study indicates that axial mechanical properties of the CRNNHC are generally superior to their radial mechanical properties, and the energy absorption before the axial deformation is relatively larger due to the existence of CNT.

Key words： nickel nano-honeycomb (NNHC) CNT-reinforced NNHC (CRNNHC) mechanical property molecular dynamics temperature effect

收稿日期: 2019-09-10

ZTFLH:

TB31

基金资助:国家自然科学基金项目(11772145);国家自然科学基金项目(11372126)

作者简介: 李源才，男，1987年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00299 或 https://www.ams.org.cn/CN/Y2020/V56/I5/785

图1 本工作所用分子动力学(MD)模型

图2 不同温度下NNHC和CRNNHC沿径向拉伸的应力-应变曲线

图3 不同温度下NNHC和CRNNHC沿径向拉伸的力学性能

图4 不同温度下NNHC和CRNNHC沿径向压缩的应力-应变曲线

图5 不同温度下NNHC和CRNNHC沿径向压缩的力学性能

图6 不同温度下NNHC和CRNNHC沿轴向拉伸的应力-应变曲线

图7 温度为900 K时CRNNHC沿轴向拉伸原子分布图

图8 不同温度下NNHC和CRNNHC沿轴向拉伸的力学性能

图9 不同温度下轴向压缩应力-应变曲线

图10 不同温度下NNHC和CRNNHC沿轴向压缩的力学性能

图11 温度为600 K时CRNNHC在径向拉伸、径向压缩、轴向拉伸和轴向压缩变形下的原子分布图

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