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Mechanical characterization of nanoindented graphene via molecular dynamics simulations.

Fang TH, Wang TH, Yang JC, Hsiao YJ - Nanoscale Res Lett (2011)

Bottom Line: The results show that the load, elastic and plastic energies, and relaxation force increased with increasing indentation depth and velocity.Resistance to deformation decreased at higher temperature.Strong adhesion caused topological defects and vacancies during the unloading process.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Rd,, Kaohsiung 807, Taiwan. fang.tehua@msa.hinet.net.

ABSTRACT
The mechanical behavior of graphene under various indentation depths, velocities, and temperatures is studied using molecular dynamics analysis. The results show that the load, elastic and plastic energies, and relaxation force increased with increasing indentation depth and velocity. Nanoindentation induced pile ups and corrugations of the graphene. Resistance to deformation decreased at higher temperature. Strong adhesion caused topological defects and vacancies during the unloading process.

No MeSH data available.


Related in: MedlinePlus

Load versus time for various velocities.
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Figure 9: Load versus time for various velocities.

Mentions: Indentation velocities of 25, 50, 75, and 100 m/s were tested by fixing the temperature at 300 K and the packing time at 15 ps. Figure 9 shows the load versus time curves for various indentation velocities. The load increases with increasing indentation velocity. This is due to the atoms having enough time to release and transfer internal residual stress at slower indentation velocities. The central heights of the residual ripple after unloading are 1.041, 0.907, 0.698, and 0.689 nm for indentation velocities of 25, 50, 75, and 100 m/s, respectively.


Mechanical characterization of nanoindented graphene via molecular dynamics simulations.

Fang TH, Wang TH, Yang JC, Hsiao YJ - Nanoscale Res Lett (2011)

Load versus time for various velocities.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211995&req=5

Figure 9: Load versus time for various velocities.
Mentions: Indentation velocities of 25, 50, 75, and 100 m/s were tested by fixing the temperature at 300 K and the packing time at 15 ps. Figure 9 shows the load versus time curves for various indentation velocities. The load increases with increasing indentation velocity. This is due to the atoms having enough time to release and transfer internal residual stress at slower indentation velocities. The central heights of the residual ripple after unloading are 1.041, 0.907, 0.698, and 0.689 nm for indentation velocities of 25, 50, 75, and 100 m/s, respectively.

Bottom Line: The results show that the load, elastic and plastic energies, and relaxation force increased with increasing indentation depth and velocity.Resistance to deformation decreased at higher temperature.Strong adhesion caused topological defects and vacancies during the unloading process.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Rd,, Kaohsiung 807, Taiwan. fang.tehua@msa.hinet.net.

ABSTRACT
The mechanical behavior of graphene under various indentation depths, velocities, and temperatures is studied using molecular dynamics analysis. The results show that the load, elastic and plastic energies, and relaxation force increased with increasing indentation depth and velocity. Nanoindentation induced pile ups and corrugations of the graphene. Resistance to deformation decreased at higher temperature. Strong adhesion caused topological defects and vacancies during the unloading process.

No MeSH data available.


Related in: MedlinePlus