Evaluation of pitting fatigue life and surface durability considering D value and hardness

Akira Yoshida, Masanori Seki, Masahiro Fujii, Kento Fukuhara

Research output: Contribution to journalArticlepeer-review


In order to examine the effects of the O-value and the hardness on the pitting fatigue life and the surface durability synthetically, data from 38 series of roller tests and 2 series of gear tests which were conducted under a sliding-rolling contact condition with various lubricating oils using various specimens with different hardness of HV170 to HV540 finished by various methods are considered in this paper. It is consequently clarified that the surface durability is proportional to the hardness and this tendency is changed by the surface roughness and the D-value, the relationship between the Dvalue and the pitting fatigue life N is not absolute with some dispersion even under the same hardness condition, the D-value at endurance limit, i. e., Dlim tends to increase as the hardness and the surface roughness increase, and as to an equation of σHIIM=aDlim385 between the Hertzian stress at endurance limit σHlim and the D lim introduced by the defined equations of the Hertzian stress and the D-value, value of a tends to decrease as the hardness and the surface roughness increase. '.

Original languageEnglish
Pages (from-to)2325-2331
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number769
Publication statusPublished - Sept 2010
Externally publishedYes


  • D-value
  • Gear
  • Hardness
  • Pitting fatigue life
  • Surface durability
  • Tribology

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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