Abstract
Test results show an increase in axial strain, average true stress, and maximum true stress at the minimum section of the neck of a round tension bar at fracture when the size of the bar is decreased. An explanation is given for this size effect on the axial strain. It suggests that the restraint on the flowing material at the heart of the neck, created by lateral stresses induced by the adjacent stagnant material, is dependent upon the diameter of the stagnant material; hence the bar diameter. Some metallurgical variations in the data are analyzed and discussed.
Issue Section:
Research Papers
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