High Strain Rate Fracture of Shear Wrinkled Graphene
Disciplines
Nanoscience and Nanotechnology
Abstract (300 words maximum)
This study explores the mechanical responses of shear wrinkled graphene to high strain rate impacts, employing molecular dynamics simulations to model the high-speed fracturing of this material. Initially, we induce shear in a graphene layer to naturally create wrinkles, following which a silver particle is propelled at the wrinkled graphene at predetermined velocities. The interaction between silver and carbon atoms is modeled using the Lennard-Jones potential, while silver atoms themselves are simulated via the embedded atom method (EAM) potential, with the second-generation REBO potential governing the carbon atoms with a cutoff distance of 2.0 Ångström. Our results reveal that shear-wrinkled graphene demonstrates greater stiffness compared to its unwrinkled counterpart, absorbing less impact energy. Notably, all graphene layers, regardless of wrinkling or shear deformation, fracture upon impact at velocities of 5 km/s, suggesting that fracture is primarily influenced by C-C bond breakage rather than pre-existing deformations. This investigation marks a significant step towards the development of robust, lightweight materials designed for military applications, significantly enriching the defense technology sector.
Academic department under which the project should be listed
SPCEET - Mechanical Engineering
Primary Investigator (PI) Name
Jungkyu Park
High Strain Rate Fracture of Shear Wrinkled Graphene
This study explores the mechanical responses of shear wrinkled graphene to high strain rate impacts, employing molecular dynamics simulations to model the high-speed fracturing of this material. Initially, we induce shear in a graphene layer to naturally create wrinkles, following which a silver particle is propelled at the wrinkled graphene at predetermined velocities. The interaction between silver and carbon atoms is modeled using the Lennard-Jones potential, while silver atoms themselves are simulated via the embedded atom method (EAM) potential, with the second-generation REBO potential governing the carbon atoms with a cutoff distance of 2.0 Ångström. Our results reveal that shear-wrinkled graphene demonstrates greater stiffness compared to its unwrinkled counterpart, absorbing less impact energy. Notably, all graphene layers, regardless of wrinkling or shear deformation, fracture upon impact at velocities of 5 km/s, suggesting that fracture is primarily influenced by C-C bond breakage rather than pre-existing deformations. This investigation marks a significant step towards the development of robust, lightweight materials designed for military applications, significantly enriching the defense technology sector.