Abstract
Under a large tensile stress the atoms in a solid may slide past one another or they may pull apart. The great contrast between ductile solids such as gold and brittle ones such as diamond has led to a widely held belief that yielding and fracture are independent processes, each occurring at its own characteristic stress, and that a solid is ductile when its yield stress lies below its fracture stress and is brittle conversely. Recent work has shown, however, that they are usually closely interlinked processes, even in the most unlikely solids. One of my aims in this lecture is to show how various types of fracture all depend in some way or other on plastic yielding.
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