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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 temperatures.
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Figure 6: Load versus time for various temperatures.

Mentions: Figure 6 shows the load versus time curves for temperatures of 0, 200, 300, and 400 K, respectively, with a velocity of 25 m/s and a packing time of 15 ps. At lower temperature, a higher force was required to achieve a given indentation depth due to the higher hardness of the material. The average maximum forces at sample temperatures of 0, 200, 300, and 400 K are 221.57, 191.24, 181.59, and 172.10 nN, respectively. Temperature control is thus necessary for a stable mechanical response. The average contact stiffnesses of the graphene at temperatures of 0, 200, 300, and 400 K are 58.7, 58.1, 49.48, and 36.6 N/m, 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 temperatures.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: Load versus time for various temperatures.
Mentions: Figure 6 shows the load versus time curves for temperatures of 0, 200, 300, and 400 K, respectively, with a velocity of 25 m/s and a packing time of 15 ps. At lower temperature, a higher force was required to achieve a given indentation depth due to the higher hardness of the material. The average maximum forces at sample temperatures of 0, 200, 300, and 400 K are 221.57, 191.24, 181.59, and 172.10 nN, respectively. Temperature control is thus necessary for a stable mechanical response. The average contact stiffnesses of the graphene at temperatures of 0, 200, 300, and 400 K are 58.7, 58.1, 49.48, and 36.6 N/m, 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