交番変位載荷を受ける鋼構造部材の極低サイクル疲労破壊実験

Abstract

An experimental study is carried out to elicit important factors causing cracks and rupture of steel members under imposed large repeated deformations, and to investigate the quantitative relationships among the important physical factors leading to failure.Eight angle specimens were subjected to repeated axial load after undergoing inelastic buckling.Particular attention was paid to the effect of elongation of the specimen on the very low-cycle fatigue behavior under load repetitions of the order of a few to twenty.The experimental results show that energy dissipation capacity depends heavily on the entire history of loading and the deflection mode, but no simple quantitative relations are observed between the initiation of the visible cracks or rupture and the energy dissipation capacity.The maximum value of residual "net" strains ranges from 30% to 35%, independent of test parameters.