Shock compression is a challenge for porous ceramics in application. In this chapter, numerical simulation and experimental observation have been introduced, which reveals generation of crack, damage, and fracture within porous ceramics upon shock wave loading. Simulation of a two-dimensional lattice-spring model explains the effects of voids and grain boundaries on the mesoscopic deformation features of shocked porous ceramics. Experiments confirm the fracture and fragmentation evolution in the post-shock ceramics. These understandings are conducive to the design, manufacture and usage of the porous ceramics under rapid impulsive loading. Furthermore, the concept of controllable fracture is proposed, which is a strategy to modulate the propagation of shock fracture in porous ceramics for the avoidance or delay of the shock-induced functional failure. It is evidenced that a “shielded region,” i.e., free of severe shock fracture, could be formed with the sacrifice of a “damaged region” in the porous ceramics.
Part of the book: Recent Advances in Porous Ceramics