大変形域における一般構造用鋼SS400材の塑性履歴特性

概要

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In order to make clear the fundamental hysteresis loop characteristics of structural carbon steel SS400 in very large plastic zones, axial cyclic loading tests are carried out, controlled by the local longitudinal strain amplitudes. The shape of hysteresis loops of the nominal stress-local longitudinal strain relationship keeps the symmetrical shape until the strain amplitude 30‰ and the nominal stress and the true stress coincide also, until 30‰. The nominal strain and the true strain coincide until 10‰. The stress at the defined strain of hysteresis loops becomes larger than the stress at the first virgin loading strain over 5.0‰. For,the application of echanical characteristics to the analysis, there are presented already many models. As a result of cmparison of hysteresis loops from test results with Ramberg-Osgood model. I-K model (Isotropic -Kinematic hardening model), it becomes cleare that there exist naturally limits of application of these models.
社団法人日本建築学会の論文
2000-10-30