About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
Atomistic Origins of Cyclic and Static Fatigue in Two Dimensional Materials |
Author(s) |
Chandra Veer Singh |
On-Site Speaker (Planned) |
Chandra Veer Singh |
Abstract Scope |
2D materials such as graphene have high specific stiffness and strength properties. Recently, graphene and graphene oxide nanosheets were reported to exhibit a fatigue life of more than a billion cycles at a mean stress of 71 GPa and a stress range of 5.6 GPa (Nature Materials 19, 405-411). However, the fundamental origins of this fatigue in 2D materials remain unknown. In this study, atomistic simulations were carried out to gain insights into the underlying mechanism and required kinetic conditions for the fatigue failure of graphene under both cyclic and sustained static loads. The results demonstrated that the fatigue failure under both cyclic and sustained static loads is a thermally activated process, dominated by the first covalent bond dissociation at the defect and immediately followed by ultimate failure. These results pave the way to better understanding of fatigue behavior in 2D materials, which is essential for their structural applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Modeling and Simulation |