Abstract
Based upon dislocation theory, some stress intensity factors can be calculated for prac tical cases. The results obtained by this method have been found to agree fairly well with the results obtained by the conventional fracture mechanics. The elastic energy momentum tensor (EEMT) has been used to calculate the force acting on the crack tip. A discussion on the kinetics of migration of impurities to the crack tip is given. It seems that the crack tip sometimes may be considered as a singularity in an elastic field, and the fundamental law of classical field theory is applicable to the problems concerning fracture of materials.
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