Phenomenological Dislocation Theory on Pre-Ductile-Fracture Process(Physics)

概要

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The strain hardening coefficient n and ultimate strain ε_u and their correlation have been investigated mainly as phenomena. In this investigation, those parameters were analysed from phenomenological dislocation theory. The strain hardening coefficient was interpreted by the product of two terms in which one is the contribution of dislocation density to flow stress and the other is dislocation multiplication rate. The ultimate strain ε_u was in some cases limited by n value but in other cases it was limited from that there was the critical dislocation density depending on grain sizes. The effect of grain sizes on strain hardening and also ultimate strain ε_u was not observed so much and it was interpreted by the theory. The effect of aging or irradiation on strain hardening and ultimate strain were clearly observed and those were also analysed by the theory.
東北大学の論文