定荷重クリープにおける仮想的初期歪速度と歪速度加速因子の意味

概要

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It has been recognized that the logarithm of creep rate varies linearly with true strain in a constant load creep. This empirical law is valid over a wide range of strain and is expressed by a following equation ; ln ε=ln ε_o+Sε, where, ε is the strain rate, ε_o is the imaginary initial strain rate, S is the strain rate acceleration factor and ε is the true strain. This equation has a potential as a powerful tool for creep life and remaining life assessment technology. In the present paper, the physical significance of the two parameters, i.e., ε_o and S, and their stress and temperature dependences were examined by a simple thought experiment and dislocation models. It was made clear that the imaginary initial creep rate is identical principally with a steady-state creep rate and the stress dependence of S is determined mainly by the work-hardening during creep.
社団法人日本鉄鋼協会の論文
1995-08-01