Two-dimensional (2D) materials, such as graphene, MoS2, et al., are promising for a wide range of
applications, such as in nanoelectronics, sensors, resonators, oscillators, nanocomposites, et al. These
applications, often under cyclic loading, demand robustness and durability. In this work, we perform
molecular dynamics simulations to study the low-cycle fatigue life and failure mechanism of MoS2
containing a crack focusing on four influencing factors: Strain range, strain ratio, initial crack size, and
temperature. We find that an increase in any of these four factors decreases the fatigue life of MoS2.
We further reveal the detailed fatigue failure process and discover that bond rupture and remaking at
the crack tips with irreversible lattice reconfiguration are necessary for crack propagation during the
cycle loading, and after even fatigue failure, the cycles of bond rupture and remaking processes at the
fractured edges can continue. We also examine the relations between the calculated fatigue life and
the four influencing factors and find that they follow the well-known fatigue laws, suggesting their
universal nature. These findings not only provide novel insights into the fatigue behaviour of MoS2,
but also are important for the engineering applications of 2D materials
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the A*STAR - SERC Central Research Fund
Grant Reference no. : N.A
This research / project is supported by the National Research Foundation - Competitive Research Program
Grant Reference no. : NRF-CRP24- 2020-0002