Fracture Mechanisms of Very Strong Solids
The use of high strength solids is limited by their brittleness. Superfically, many of them are completely brittle and their fracture is widely treated as a purely elastic process. This concept requires reexamination in terms of the relative ease of an atomic shear movement and of an atomic pulling-apart at a crack tip. Theoretical treatments of this problem are considered. Truly brittle fracture emerges as a process that is probably quite rare. The fracture of alumina is taken as a detailed example. Compositional, heat treatment and chemical environmental effects on fractures may arise from their influence on the critical shear stress.
KeywordsPlastic Deformation Fracture Stress Plastic Zone Fracture Strength Minimum Strength
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