Niobium/alumina bicrystal interface fracture

In the presented work, an eort has been put to clear up the theoretical interlink between local adhesion capacity and macroscopic fracture energies by bridging dierent length scales, such as nano-, meso-, and macroscale.
Crystal plasticity theory along with a cohesive modelling approach has been used during this work. The inuence of dierent cohesive law parameters (cohesive strength, work of adhesion) on the macroscopic fracture energies for three dierent orientations of niobium/alumina bicrystal specimens has been presented. It is found that cohesive strength has a stronger eect on macroscopic
fracture energies as compared to work of adhesion. In the last part a generalized correlation among macro- scopic fracture energy, cohesive strength, work of adhesion and yield stress is derived. The presented results can provide a great help to experimentalists in order to design better metal/ceramic interfaces.