Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

Abstract

This paper presents the results of un-stiffened cantilever column subjected to incremental or constant amplitude cyclic loading. The objectives of this study are to investigate the extremely low cycle fatigue life of the column and verify the proposed strain based approach. During the test, fatigue cracks initiated from the weld toe at the corner and propagated along the weld toe. Finally, the column ruptured without a local buckling. The failure of low cycle fatigue induced by large cyclic deformation has been elucidated. In a further step, the crack initiation life was estimated based on the local strain by proposed simple approach. It is indicated that correlation between the test result and the estimated life was good enough.

Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers

“…The consensus is that brittle fracture after ductile crack initiation occurs under large-strain cyclic loading. For unstiffened cantilever steel columns with large cyclic deformation, Tateishi et al [ 21 , 22 ] monitored the process of crack initiation, propagation, and final failure during ULCF fracture tests and proposed an approach based on the local strain to estimate the ULCF crack-initiation life. In addition, they investigated the extremely low cycle fatigue life of such columns.…”

Ultra-low cycle fatigue properties and fracture mechanism of corroded structural steel

“…Among them, Kuwamura [5,6] observed ductile crack initiation and propagation before brittle fracture in a ULCF fracture test for notched steel specimens. Ge [7 9] and Tateishi [10 12] identified ULCF fracture characteristics through laboratory tests for structural steel members and proposed a series of prediction models and assessment methods.…”