Honor 2- DAMAGE-TOLERANCE IN NATURAL AND ENGINEERING MATERIALS
Robert O. Ritchie
Fracture can be considered as a mutual competition between intrinsic resistance (induced largely by plasticity) to damage processes that operate ahead of a crack tip to promote crack advance and extrinsic crack-tip shielding mechanisms that act at, or behind, the tip to locally diminish crack-tip stresses and strains. We examine here how this mechanistic interplay is utilized to derive damage-tolerance in natural materials, e.g., bone, teeth, skin, sea shells and fish scales, compared to engineering structural materials such as aerospace ceramic-matrix composites, nuclear graphite, and advanced metallic materials, such as metallic glasses and high-entropy alloys.
Fri 2:00 pm - 2:45 pm