Abstract
Abstract The results of several tension tests with round and flat bars of mild steel and iron, under the influence of variations in speed of stretching and testing-machine rigidity, are presented. The emphasis in this work has been placed upon explaining the yield-point phenomena, as viewed externally on a stress-strain diagram, by the observations made and data taken on the internal localized yielding, as presented by the test piece. The study has been focused on the initiation of the plastic zone and the propagation of the boundaries of this zone, sometimes called the plastic working lengths, along the length of the tensile specimen.
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