Elastic Buckling Behaviour of General Multi-Layered Graphene Sheets

Rong Ming Lin; Rong Ming Lin

doi:10.3934/matersci.2015.2.61

AIMS Materials Science

2015, Volume 2, Issue 2: 61-78. doi: 10.3934/matersci.2015.2.61

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Elastic Buckling Behaviour of General Multi-Layered Graphene Sheets

Rong Ming Lin ^,

Aerospace Engineering Division, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798 Singapore

Received: 14 January 2015 Accepted: 07 April 2015 Published: 10 April 2015

Elastic buckling behaviour of multi-layered graphene sheets is rigorously investigated. Van der Waals forces are modelled, to a first order approximation, as linear physical springs which connect the nodes between the layers. Critical buckling loads and their associated modes are established and analyzed under different boundary conditions, aspect ratios and compressive loading ratios in the case of graphene sheets compressed in two perpendicular directions. Various practically possible loading configurations are examined and their effect on buckling characteristics is assessed. To model more accurately the buckling behaviour of multi-layered graphene sheets, a physically more representative and realistic mixed boundary support concept is proposed and applied. For the fundamental buckling mode under mixed boundary support, the layers with different boundary supports deform similarly but non-identically, leading to resultant van der Waals bonding forces between the layers which in turn affect critical buckling load. Results are compared with existing known solutions to illustrate the excellent numerical accuracy of the proposed modelling approach. The buckling characteristics of graphene sheets presented in this paper form a comprehensive and wholesome study which can be used as potential structural design guideline when graphene sheets are employed for nano-scale sensing and actuation applications such as nano-electro-mechanical systems.
- buckling,
- critical loads,
- multi-layered graphene sheets,
- van der waals forces,
- differential quadrature
Citation: Rong Ming Lin. Elastic Buckling Behaviour of General Multi-Layered Graphene Sheets[J]. AIMS Materials Science, 2015, 2(2): 61-78. doi: 10.3934/matersci.2015.2.61

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Abstract

Elastic buckling behaviour of multi-layered graphene sheets is rigorously investigated. Van der Waals forces are modelled, to a first order approximation, as linear physical springs which connect the nodes between the layers. Critical buckling loads and their associated modes are established and analyzed under different boundary conditions, aspect ratios and compressive loading ratios in the case of graphene sheets compressed in two perpendicular directions. Various practically possible loading configurations are examined and their effect on buckling characteristics is assessed. To model more accurately the buckling behaviour of multi-layered graphene sheets, a physically more representative and realistic mixed boundary support concept is proposed and applied. For the fundamental buckling mode under mixed boundary support, the layers with different boundary supports deform similarly but non-identically, leading to resultant van der Waals bonding forces between the layers which in turn affect critical buckling load. Results are compared with existing known solutions to illustrate the excellent numerical accuracy of the proposed modelling approach. The buckling characteristics of graphene sheets presented in this paper form a comprehensive and wholesome study which can be used as potential structural design guideline when graphene sheets are employed for nano-scale sensing and actuation applications such as nano-electro-mechanical systems.

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