Event Timeslots (1)

Day 1 – June 20
Peridynamics is a non-local continuum mechanics modelling technique that can capture discontinuities, in particular cracking, where discrete finite element methods often cannot. Cracks can evolve naturally within the model, without an initiation point, making it ideally suited to modelling cracking in the oxide on zirconium alloys and naturally capturing phenomena such as buckling of the oxide and the oxide-metal interface. This can provide insight into the mechanisms driving the formation of predominantly lateral cracks seen periodically through the oxide thickness as it grows. These cracks occur in relation to transitions, where the passivating nature of the oxide layer breaks down and allows oxygen transport to the metal surface before the passivating oxide forms again.

This work uses bond-based peridynamics implemented in the finite element software Abaqus, where truss elements represent forces carried between material points (nodes) and is a study into the various model parameters that affect the development of the oxidation front and its progression. This includes the thickness of the transition region, the amount of metal initially oxidised and the rate the front moves through. Furthermore, the effect of boundary conditions and constraints are investigated in an attempt to capture oxidation behaviour observed experimentally and to understand the mechanisms behind it.