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Issue 12, 2016
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Critical length scales and strain localization govern the mechanical performance of multi-layer graphene assemblies

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Abstract

Multi-layer graphene assemblies (MLGs) or fibers with a staggered architecture exhibit high toughness and failure strain that surpass those of the constituent single sheets. However, how the architectural parameters such as the sheet overlap length affect these mechanical properties remains unknown due in part to the limitations of mechanical continuum models. By exploring the mechanics of MLG assemblies under tensile deformation using our established coarse-grained molecular modeling framework, we have identified three different critical interlayer overlap lengths controlling the strength, plastic stress, and toughness of MLGs, respectively. The shortest critical length scale Lsc governs the strength of the assembly as predicted by the shear-lag model. The intermediate critical length Lpc is associated with a dynamic frictional process that governs the strain localization propensity of the assembly, and hence the failure strain. The largest critical length scale LTc corresponds to the overlap length necessary to achieve 90% of the maximum theoretical toughness of the material. Our analyses provide the general guidelines for tuning the constitutive properties and toughness of multilayer 2D nanomaterials using elasticity, interlayer adhesion energy and geometry as molecular design parameters.

Graphical abstract: Critical length scales and strain localization govern the mechanical performance of multi-layer graphene assemblies

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Article information


Submitted
30 Nov 2015
Accepted
09 Feb 2016
First published
03 Mar 2016

Nanoscale, 2016,8, 6456-6462
Article type
Communication
Author version available

Critical length scales and strain localization govern the mechanical performance of multi-layer graphene assemblies

W. Xia, L. Ruiz, N. M. Pugno and S. Keten, Nanoscale, 2016, 8, 6456
DOI: 10.1039/C5NR08488A

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