Interfacial shear stress transfer of a monolayer graphene on top of a polymer substrate subjected to uniaxial tension was investigated by a cohesive zone model integrated with a shear-lag model. Strain distribution in the graphene flake was found to behave in three stages in general, bonded, damaged, and debonded, as a result of the interfacial stress transfer. By fitting the cohesive-shear-lag model to our experimental results, the interface properties were identified including interface stiffness (74 Tpa/m), shear strength (0.50 Mpa), and mode II fracture toughness (0.08 N/m). Parametric studies showed that larger interface stiffness and/or shear strength can lead to better stress transfer efficiency, and high fracture toughness can delay debonding from occurring. 3D finite element simulations were performed to capture the interfacial stress transfer in graphene flakes with realistic geometries. The present study can provide valuable insight and design guidelines for enhancing interfacial shear stress transfer in nanocomposites, stretchable electronics and other applications based on graphene and other 2D nanomaterials.
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March 2015
Research-Article
Cohesive-Shear-Lag Modeling of Interfacial Stress Transfer Between a Monolayer Graphene and a Polymer Substrate
Guodong Guo,
Guodong Guo
Department of Mechanical
and Aerospace Engineering,
and Aerospace Engineering,
North Carolina State University
,Raleigh, NC 27695
Search for other works by this author on:
Yong Zhu
Yong Zhu
1
Department of Mechanical
and Aerospace Engineering,
e-mail: yong_zhu@ncsu.edu
and Aerospace Engineering,
North Carolina State University
,Raleigh, NC 27695
e-mail: yong_zhu@ncsu.edu
1Corresponding author.
Search for other works by this author on:
Guodong Guo
Department of Mechanical
and Aerospace Engineering,
and Aerospace Engineering,
North Carolina State University
,Raleigh, NC 27695
Yong Zhu
Department of Mechanical
and Aerospace Engineering,
e-mail: yong_zhu@ncsu.edu
and Aerospace Engineering,
North Carolina State University
,Raleigh, NC 27695
e-mail: yong_zhu@ncsu.edu
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received November 20, 2014; final manuscript received January 19, 2015; published online January 30, 2015. Editor: Yonggang Huang.
J. Appl. Mech. Mar 2015, 82(3): 031005 (7 pages)
Published Online: March 1, 2015
Article history
Received:
November 20, 2014
Revision Received:
January 19, 2015
Online:
January 30, 2015
Citation
Guo, G., and Zhu, Y. (March 1, 2015). "Cohesive-Shear-Lag Modeling of Interfacial Stress Transfer Between a Monolayer Graphene and a Polymer Substrate." ASME. J. Appl. Mech. March 2015; 82(3): 031005. https://doi.org/10.1115/1.4029635
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