Abstract
Stable-crack growth precedes cleavage fracture in the upper ductile-brittle transition region. It is suggested that the conversion from one fracture mode to the other occurs at random locations in the microstructure, denoted trigger points. It also is suggested that K Ic for cleavage should be calculated from the elastic energy in the specimen at the point of conversion. Experiments are described that showed that the amount of stable-crack growth increases with increasing temperature and with decreasing load-train compliance.
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