石墨烯增强层对石墨烯/Al复合材料不同压缩阶段的强化影响

颜建伟; 程超; 金超奇; 谭鑫; 朱兆铭

doi:10.13801/j.cnki.fhclxb.20220913.002

石墨烯增强层对石墨烯/Al复合材料不同压缩阶段的强化影响

doi: 10.13801/j.cnki.fhclxb.20220913.002

颜建伟^{1, 2, ,},
程超^{1, 2,},
金超奇^{1, 2},
谭鑫^{1, 2},
朱兆铭^{1, 2}

1.
华东交通大学　土木建筑学院，南昌 330013
2.
华东交通大学　轨道交通基础设施性能监测与保障国家重点实验室，南昌 330013

基金项目: 国家自然科学基金(12072112)；江西省杰出青年科学基金(20202 ACBL214014)

详细信息

通讯作者:
颜建伟，博士，教授，博士生导师，研究方向为纳系统非线性动力学　E-mail: tyanjianwei@jnu.edu.cn

中图分类号: TB331
计量
- 文章访问数: 258
- HTML全文浏览量: 163
- 被引次数: 0
出版历程
- 收稿日期: 2022-07-11
- 修回日期: 2022-08-17
- 录用日期: 2022-08-29
- 网络出版日期: 2022-09-14

Effect of graphene reinforcement on strengthening of grapheme/Al composites at different compression stages

YAN Jianwei^{1, 2
, ,},
CHENG Chao^{1, 2
,},
JIN Chaoqi^{1, 2},
TAN Xin^{1, 2},
ZHU Zhaoming^{1, 2}

1.
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
2.
State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China

Funds: National Natural Science Foundation of China (12072112)； Natural Science Foundation of Jiangxi Province (20202 ACBL214014)

摘要

摘要: 利用分子动力学(MD)方法探究了石墨烯纳米片(GNs)层数和每层片数对GNs/Al复合材料不同压缩阶段力学增强效果的影响。结果发现：GNs层和片数越多，复合材料弹性模量、屈服强度和最大应力强度的增强效果越显著，且增强层由3片及以上GNs构成时，压缩曲线会出现双最大应力峰值。压缩后期，GNs的断裂造成复合材料的各向异性，使复合材料在GNs锯齿形方向上的横向变形大于扶手椅方向。与MD结果对比分析发现，当金属层厚不足3 nm时，限制层滑模型不再适用。
- 分子动力学 /
- 石墨烯/Al复合材料 /
- 压缩阶段 /
- 位错结构 /
- 限制层滑模型
Abstract: Molecular dynamics (MD) method was used to investigate the effect of the number of graphene nanosheets (GNs) layers and the number of sheets in each layer on the mechanical reinforcement of GNs/Al composite at different compression stages. The results show that the increase of GNs layers and the number of GNs sheets increases the enhancement effect of elastic modulus, yield strength and maximum stress strength of the composite. When the reinforcement layer is composed of 3 or more GNs sheets, double maximum stress peaks appear in the compression curve. At the late compression stage, the fracture of GNs results in the anisotropy of the composite, and the transverse deformation of the composite in the zigzag direction of GNs is larger than that in the armchair direction. When the thickness of metal layer is less than 3 nm, the confined layer slip model is not applicable.
- molecular dynamics /
- graphene/Al composites /
- compression stage /
- dislocation structure /
- confined layer slip model

HTML全文

图 1 石墨烯纳米片(GNs)/Al复合材料模型图

Figure 1. Graphene nanosheets (GNs)/Al composite model diagram

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图 2 GNs/Al复合材料应力-应变曲线

Figure 2. Stress-strain curves of GNs/Al composite

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图 3 GNs/Al复合材料压缩时的微观结构

Figure 3. Microstructure of the GNs/Al composite under compression

HCP—; ε—

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图 4 GNs断裂

Figure 4. Fracture of GNs

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图 5 GNs/Al复合材料表面的滑移台阶

Figure 5. Slip steps on the surface of GNs/Al composite

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图 6 GNs/Al复合材料模型结构分层图解

Figure 6. Diagram of hierarchical model structure of GNs/Al composite

λ₁, λ₂—Thickness of GNs and Al in the basic periodic layer, respectively; h—Periodic layer thickness

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图 7 GNs/Al复合材料计算弹性模量的比较

Figure 7. Comparison of calculated elastic moduli of GNs/Al composite

ROM—Rule of mixtures; MD—Molecular dynamics

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图 8 GNs/Al复合材料计算屈服强度的比较

Figure 8. Comparison of calculated yield strength of GNs/Al composite

CLS—Confined layer slip

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图 9 GNs层示意图

Figure 9. Diagram of the GNs layer

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图 10 GNs/Al复合材料的压缩应力-应变曲线与位错形态

Figure 10. Compressive stress-strain curves and dislocation morphology of GNs/Al composite

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图 11 GNs/Al复合材料双最大应力峰值产生过程的示意图

Figure 11. Schematic diagram of the generation process of double maximum stress peaks of GNs/Al composite

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图 12 GNs/Al复合材料的横向变形

Figure 12. Transverse deformation of GNs/Al composite

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图 13 GNs的破坏失效

Figure 13. Failure of GNs

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表 1 不同GNs层数复合材料的弹性模量、屈服强度和最大应力强度

Table 1. Elastic modulus, yield strength and maximum stress strength of composites with different GNs layers

Number of GNs layers	Thickness of periodic layer/nm	Elasticity modulus/ GPa	Yield strength/GPa	Maximum stress/ GPa
0	16.20	69.9	5.41	−
1	8.27	71.7	6.96	9.08
2	5.51	72.2	8.09	17.49
3	4.13	75.8	9.12	30.05
4	3.31	79.4	10.03	44.46
5	2.76	82.9	10.74	54.21

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