Dynamic crack propagation across an adhesive interface in a borosilicate glass and a glass ceramic was studied to understand the interactions of cracks with the interface. Specimens were manufactured by attaching a notched plate to a rectangular plate using an epoxy adhesive. A plastic projectile was impacted on the notched edge to initiate a single crack at the notch tip in the first plate. The propagation of the crack in the first plate and the crack patterns after the interface in the second plate were recorded using a high speed camera. For borosilicate glass, a single crack propagated to the adhesive interface and arrested for a certain time. Cracks re-initiated in the second plate, and crack patterns were observed to depend on the thickness of the adhesive interface. The crack developed a higher number of branches, and the branching angle increased as the interface thickness was increased. For the glass ceramic, the notch-initiated crack branched in the first plate and did not penetrate through to the second plate regardless of the various adhesive thicknesses studied.
