Presented by: 
Louise Olsen-Kettle (UQ)
Mon 24 Oct, 2:00 pm - 3:00 pm
Mansergh Shaw building (45), room 204

Earthquake ruptures and fractures cause a drastic change in the fundamental behaviour of a system and involve interactions between structures at many different scales. The large-scale behaviour of earthquakes or fractures is controlled by the cooperativity and scaling up of these interactions. These systems are not amenable to mathematical analytical descriptions and can only be explored by numerical experiments. We have studied these instabilities in detail using numerical simulations of dynamic rupture and fracture propagation in order to gain better insights to the underlying physics. Rupture propagation directly affects the growth and eventual size of earthquakes, the energy radiation patterns and the resulting ground motions that induce tsunamis, landslides and damage to infrastructure. To analyse or if possible predict the failure of materials is still one of the main goals of engineering science. Models of damage evolution and fracture propagation using continuum damage mechanics are developed where we consider both isotropic and anisotropic damage models. Mesh dependency in numerical simulations is a significant hurdle in simulations of nonlinear instabilities such as fault rupture and fracture propagation. We demonstrate how nonlinear, scale-dependent, higher order terms in numerical simulations can produce mesh dependency and complexity in nonlinear models. Future applications of these fracture propagation models will be applied to unconventional coal seam gas reservoirs to advance current conventional industry fracture simulators and model the 3D complex fractures produced in the field.