Effects of Tensile Pre-strain on the Torsional Fatigue Properties of Structural Carbon Steels

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  • Zhou Congling
    Graduate School of Science and Engineering, Saga University
  • Nishida Shinichi
    Department of Mechanical Engineering, Faculty of Science and Engineering, Saga University
  • Hattori Nobusuke
    Department of Mechanical Engineering, Faculty of Science and Engineering, Saga University

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  • 201 構造用鋼の捩り疲労特性に及ぼす引張り予ひずみの影響

Abstract

In the present study, the effects of the tensile pre-strain ratio on the torsional fatigue properties have been investigated using three kinds of structural carbon steels, S15C, S25c and S45C in view-point of fatigue strength, crack initiation and propagation. According to the experimental results and observation of crack propagation properties, the main results obtained in this study are as follow : (1) For the non-aging processed specimen, when the pre-strain ratio is high, fatigue strength increases with the increase of pre-strain ratio. (2) Aging process improves the torsional fatigue strength of the structural carbon steels.

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