Original paper(Vol.45 No.1 pp.21)

Low-cycle fatigue behavior of notched low-carbon steel components

Morimoto Akihiro; Saito Atsushi; Matsumoto Eiichi; Matsushima Jun

Abstract:Large structures are usually constructed using the conventional low-carbon steel and often contain many kinds of discontinuous cross sections or initial defects. The fatigue cracks commonly initiate at these sites under repeated loadings. So, the estimation of low-cycle fatigue life of the notched components is significantly important in the design of structures.
In this study, the low-cycle fatigue tests were carried out using the smooth round bar specimens and the notched plate specimens machined from the hot rolled low-carbon steel sheets of SM400A, SM400B and SM490A. After analyzing the experimental data, the estimating method of low-cycle fatigue life of notched specimens was proposed.

Key Words:low-cycle fatigue, notch, low-carbon steel, fatigue strength reduction factor, elastic-plastic strain concentration factor