Mechanical characterization of nanoindented graphene via molecular dynamics simulations
1 Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Rd., Kaohsiung 807, Taiwan
2 Central Product Solutions, Advanced Semiconductor Engineering, Inc., Kaohsiung 811, Taiwan
3 Institute of Mechanical and Electromechanical Engineering, National Formosa University, Yunlin 632, Taiwan
4 National Nano Device Laboratories, Tainan 741, Taiwan
Nanoscale Research Letters 2011, 6:481 doi:10.1186/1556-276X-6-481Published: 3 August 2011
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.