Proposal of rolling contact fatigue crack growth test using a specimen with a small artificial hole

Hiroki Komata, Junichiro Yamabe, Yoshihiro Fukushima, Saburo Matsuoka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In order to improve the reliability of rolling bearings, it is necessary to clarify effects of hydrogen on rolling contact fatigue properties of bearing steels. This study shows a new method for the rolling contact fatigue crack growth testing. A small artificial hole makes quantitative evaluation of crack growth possible under rolling contact fatigue, although the rolling contact fatigue generally induces invisible inner crack initiation and growth from defects such as nonmetallic inclusions in the bearing steels. Firstly, shape of a small hole for rolling contact fatigue crack growth test was optimized on the basis of shear stress distribution around a small hole analyzed by FEM. New rolling contact fatigue tests were performed using uncharged specimens (hydrogen content C H = 0.4 mass ppm) and hydrogen-charged specimens (C H = 0.8 ∼1.2 mass ppm) with a small artificial hole (diameter d = 50 or 100 μm, depth h = 100 μm) for bearing steel SUJ2. The Mode II fatigue growth rate of the hydrogen-charged specimens was about twice higher than that of the uncharged specimens. These results demonstrated that the new rolling contact fatigue testing was useful to investigate Mode II fatigue crack growth.

Original languageEnglish
Pages (from-to)1250-1265
Number of pages16
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume78
Issue number793
DOIs
Publication statusPublished - Oct 17 2012

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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