山形鋼部材の極低サイクル疲労破壊実験(その2)

Abstract

An experimental investigation has been performed on very-low-cycle fatigue of steel angles, which were subjected to repeated axial load after undergoing inelastic buckling. The objective of this study is to extract decisive factors causing cracks and rupture in the course of loading repetitions of the order of a few to twenty cycles. The experimental results show that the number of load cycles at rupture decreases as the width-to-thickness ratio becomes smaller and the slenderness ratio becomes larger. Energy absorption capacities depend heavily on the entire history of loading, failure mode, slenderness ratio and width-to-thickness ratio. The maximum values of residual "net" strains, excluding contributions from crack opening, of all the specimens are of the order of 25-40% and they do not depend on loading pattern, failure mode, slenderness ratio or width-to-thickness ratio.