Computational modeling of the mechanics and fracture of 2D materials with defects and grain boundaries

Zhao Qin, Gang Seob Jung, Shanshan Wang, Francisco J. Martin-Martinez, Jamie H. Warner, Markus J. Buehler

Research output: Contribution to conferencePaper

Abstract

Two dimensional materials including graphene, silicene, MoS2 and so forth represent ideal materials composed of a single layer of atoms organized in a lattice form. Their unique geometry and intriguing mechanical and thermal properties make them perfect candidates for nanoscale engineering applications. The robustness of the materials, especially for their tolerance with defects is important to prevent their catastrophic failure and contribute to their mechanical durability in usage. Here we have shown that our large-scale molecular dynamics modeling based on reactive force fields provides a useful tool to explore the mechanical response and fracture of different 2D materials under extreme mechanical loading conditions. Our research focuses on how defects and grain boundaries in 2D materials affect the critical conditions and the dynamics process of their fracture. We find good agreements between our simulations and experiments via transmission electron microscopy for MoS2 fracture as all experimental observations of crack propagation, deflection and the interaction between crack tip and defects have been observed in the simulation with similar boundary conditions, as shown in Figure 1.

Original languageEnglish (US)
Pages1246-1247
Number of pages2
StatePublished - Jan 1 2017
Externally publishedYes
Event14th International Conference on Fracture, ICF 2017 - Rhodes, Greece
Duration: Jun 18 2017Jun 20 2017

Conference

Conference14th International Conference on Fracture, ICF 2017
CountryGreece
CityRhodes
Period6/18/176/20/17

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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    Qin, Z., Jung, G. S., Wang, S., Martin-Martinez, F. J., Warner, J. H., & Buehler, M. J. (2017). Computational modeling of the mechanics and fracture of 2D materials with defects and grain boundaries. 1246-1247. Paper presented at 14th International Conference on Fracture, ICF 2017, Rhodes, Greece.