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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

Topographies for velocities. Velocities of (a1, a2) 25 m/s, (b1, b2) 50 m/s, (c1, c2) 75 m/s, and (d1, d2) 100 m/s.
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Figure 11: Topographies for velocities. Velocities of (a1, a2) 25 m/s, (b1, b2) 50 m/s, (c1, c2) 75 m/s, and (d1, d2) 100 m/s.

Mentions: Figure 10 shows the elastic energy and plastic energy versus indentation velocity curves. Both energies increase with increasing velocity. Relaxation forces of 159.05, 222.93, 280.94, and 314.56 nN were obtained for indentation velocities of 25, 50, 75, and 100 m/s, respectively. Figure 11 shows the topographies obtained for various velocities. A slower indentation allows more atoms to adhere on the tip, and thus a larger area of the substrate is pull up during tip unloading, forming a higher peak.


Mechanical characterization of nanoindented graphene via molecular dynamics simulations.

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

Topographies for velocities. Velocities of (a1, a2) 25 m/s, (b1, b2) 50 m/s, (c1, c2) 75 m/s, and (d1, d2) 100 m/s.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 11: Topographies for velocities. Velocities of (a1, a2) 25 m/s, (b1, b2) 50 m/s, (c1, c2) 75 m/s, and (d1, d2) 100 m/s.
Mentions: Figure 10 shows the elastic energy and plastic energy versus indentation velocity curves. Both energies increase with increasing velocity. Relaxation forces of 159.05, 222.93, 280.94, and 314.56 nN were obtained for indentation velocities of 25, 50, 75, and 100 m/s, respectively. Figure 11 shows the topographies obtained for various velocities. A slower indentation allows more atoms to adhere on the tip, and thus a larger area of the substrate is pull up during tip unloading, forming a higher peak.

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