Quantitative Evaluation of Effect of Artificial Small Defects on Torsional Fatigue Strength

In order to investigate the effect of artificial small defects on torsional fatigue strength of high strength steel, fatigue tests for a maraging steel (HV≅740) containing a small hole of diameter=100, 200, and 500μm were carried out. Torsional fatigue limit of the maraging steel was determined by t...

Full description

Saved in:
Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series A Vol. 64; no. 618; pp. 271 - 277
Main Authors MURAKAMI, Yukitaka, TAKAHASHI, Koji, TAKADA, Masayuki, TORIYAMA, Toshiyuki
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 1998
Subjects
(area) Parameter Model
Artificial Small Defect
Fatigue
Fatigue Strength
Maraging Steel
Torsional Fatigue
Vickers Hardness (HV)
Online AccessGet full text

Cover

More Information
Summary:In order to investigate the effect of artificial small defects on torsional fatigue strength of high strength steel, fatigue tests for a maraging steel (HV≅740) containing a small hole of diameter=100, 200, and 500μm were carried out. Torsional fatigue limit of the maraging steel was determined by the threshold condition of non-propagating cracks emanating either at the edge of hole or the smooth part of the specimens depending on the diameter of hole. The critical diameter of hole (dc) which does not influence torsional fatigue strength for several materials is between 100μm and 200μm regardless of hardness. Prediction equation for bending fatigue limit (σω) by the √(area) parameter model was extendedly applied to predict torsional fatigue limit (τω) for both smooth and holed specimens. The fatigue limits predicted by these method were in good agreement with the experimental results.
ISSN:0387-5008
1884-8338
DOI:10.1299/kikaia.64.271