Failure mechanism of monolayer graphene under hypervelocity impact of spherical projectile

Xia, Kang, Zhan, Haifei, Hu, De'an, & Gu, YuanTong (2016) Failure mechanism of monolayer graphene under hypervelocity impact of spherical projectile. Scientific Reports, 6, Article Number-33139.

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The excellent mechanical properties of graphene have enabled it as appealing candidate in the field of impact protection or protective shield. By considering a monolayer graphene membrane, in this work, we assessed its deformation mechanisms under hypervelocity impact (from 2 to 6 km/s), based on a serial of in silico studies. It is found that the cracks are formed preferentially in the zigzag directions which are consistent with that observed from tensile deformation. Specifically, the boundary condition is found to exert an obvious influence on the stress distribution and transmission during the impact process, which eventually influences the penetration energy and crack growth. For similar sample size, the circular shape graphene possesses the best impact resistance, followed by hexagonal graphene membrane. Moreover, it is found the failure shape of graphene membrane has a strong relationship with the initial kinetic energy of the projectile. The higher kinetic energy, the more number the cracks. This study provides a fundamental understanding of the deformation mechanisms of monolayer graphene under impact, which is crucial in order to facilitate their emerging future applications for impact protection, such as protective shield from orbital debris for spacecraft.

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ID Code: 99963
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: graphene, hypervelocity impact, fracture, crack, molecular dynamics simulations
DOI: 10.1038/srep33139
ISSN: 2045-2322
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanomaterials (100708)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 The Author(s)
Copyright Statement: This work is licensed under a Creative Commons Attribution 4.0 International License. The images
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Deposited On: 13 Oct 2016 23:17
Last Modified: 16 Oct 2016 22:25

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