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Abstract

Aluminum-based composite material is one of the most important candidate materials in the mechanical industry and aerospace engineering due to its light weight and high strength. Graphene is an ideal reinforcement for composite materials for its excellent mechanical properties. Till-now, the contribution of graphene sheets in the process of crack propagation in composites is not clear. In present work, the effects of graphene size and distribution in graphene/aluminum composites are explored using molecular dynamics simulation methods. It is found that when the length of graphene flake is less than 3.35 nm, the generated sub-cracks in the composite is benefit to the crack propagation. This effect reduces the mechanical properties of composite. When the length of graphene flake is greater than 3.35 nm, graphene sheet impedes the crack propagation and dislocates slip at sub-cracks. In addition, the distribution of graphene flakes angle changes the crack propagation path. Our findings also provide insights into ways to optimize mechanical properties of graphene/aluminum composites.

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Authors and contacts

Corresponding author:Li Zhi-Hui,zhli0097@x263.net; Zhao Jun-Hua,junhua.zhao@163.com

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11502217), and the Manned Space Engineering Technology “Development of Large-scale Spacecraft Flight and Reentry Surveillance and Prediction System”, China (Grant No. 2020-ZKZX-5011).

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模型名称	l/nm	δ/nm	模型名称	l/nm	δ/nm
Pure Al	0	0	B-Gr/Al-2	5.43	1.72
A-Gr/Al-1	0.97	1.72	B-Gr/Al-3	7.53	1.72
A-Gr/Al-2	1.49	1.72—4.96	B-Gr/Al-4	9.92	1.72
A-Gr/Al-3	2.64	1.72	B-Gr/Al-5	15.22	1.72
A-Gr/Al-4	3.35	1.72	p-Gr/Al	20.25	1.72
B-Gr/Al-1	4.18	1.72—4.96

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	相互作用的原子
L-J势函数参数	Al-Al^[31]	C-C^[32]	Al-C^[29,30]
σ/Å	2.6200	3.4070	3.0135
ε/eV	0.4157	0.00296	0.0351

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Vol. 71, Issue 13 - 2022-07-05

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