Effects of Heating Conditions on Residual Stress, Hardened Layer and Bending Fatigue Strength of Induction Hardened Spur Gears

2003 ◽  
Vol 2003.41 (0) ◽  
pp. 247-248
Author(s):  
Kouitsu MIYACHIKA ◽  
Hiroyuki NAKAI ◽  
Hidefumi MADA ◽  
Satoshi ODA ◽  
Hiroshige FUJIO ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Hardened Layer ◽  
Spur Gears ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

2210 Residual Stress and Bending Fatigue Strength of Case-Carburized Thin-Rimmed Spur Gears with Web Arrangement

2006 ◽  
Vol 2006.6 (0) ◽  
pp. 217-220
Author(s):  
Kouitsu MIYACHIKA ◽  
Wei-Dong XUE ◽  
Kengo NOJIMA ◽  
Tomoya YOSHIKAWA ◽  
Hidefumi MADA ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Spur Gears ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

Residual Stress, Hardened Layer and Bending Fatigue Strength of Induction Hardened Sintered Metal Gears

2002 ◽  
Vol 2002.5 (0) ◽  
pp. 15-16
Author(s):  
Kouitsu MIYACHIKA ◽  
Takao KOIDE ◽  
Satoshi ODA ◽  
Naoki MOTOOKA ◽  
Keiichi UEMOTO ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Hardened Layer ◽  
Bending Fatigue ◽  
Sintered Metal ◽  
Bending Fatigue Strength

Residual Stress and Bending Fatigue Strength of Case-Carburized Thin-Rimmed Spur Gears With Asymmetric Web Arrangement

2007 ◽  
Author(s):  
Kouitsu Miyachika ◽  
Wei-Dong Xue ◽  
Takao Koide ◽  
Hidefumi Mada ◽  
Kengo Nojima ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Three Dimensional ◽  
Spur Gear ◽  
Fatigue Tests ◽  
Case Depth ◽  
Spur Gears ◽  
3D Fem ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

This paper presents a study on effects of carburized parts on residual stress and bending fatigue strength of case-carburized thin-rimmed spur gears with asymmetric web arrangement. A heat conduction analysis and an elastic-plastic stress analysis for the case-carburizing process of thin-rimmed spur gears with asymmetric web arrangement were carried out by the three-dimensional finite-element method (3D-FEM), and then residual stresses were obtained. Effects of the case depth, the carburized part and the rim thickness on the residual stress of case-carburized thin-rimmed spur gears were determined. Bending fatigue tests were carried out for case-carburized thin-rimmed spur gears with asymmetric web arrangement, and S-N curves and bending fatigue limit loads were obtained. Effects of the case-depth, the carburized part and the rim thickness on the bending fatigue strength of the case-carburized thin-rimmed spur gear with asymmetric web arrangement were determined.

Bending fatigue strength and impact strength of spur gears with various surface hardening treatments

2021 ◽  
Vol 2021.59 (0) ◽  
pp. 05a1
Author(s):  
Ryo ASAKURA ◽  
Kohei HIBI ◽  
Kenichi SAKAMOTO ◽  
Toshiyasu OMURA ◽  
Ryosuke NISHI ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Impact Strength ◽  
Surface Hardening ◽  
Spur Gears ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

The Evaluation of Bending Fatigue Testing of Austempered Ductile Iron Spur Gear

2019 ◽  
Author(s):  
Qi Zhang ◽  
Jianhua Lv ◽  
Rizwanulhaque Syed ◽  
Jing Zhang ◽  
Yang Xu ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Ductile Iron ◽  
Fatigue Testing ◽  
Spur Gear ◽  
Austempered Ductile Iron ◽  
Spur Gears ◽  
Reliability Design ◽  
Bending Fatigue ◽  
Bending Fatigue Strength ◽  
Number Of Cycles

Abstract An experimental evaluation of bending fatigue strength for austempered ductile iron (ADI) spur gears have been performed using Zwick fatigue tester. The gear material was manufactured by vertically continuous casting, in which the radius of the graphite grains is smaller. The Stress-Number of Cycles curve (S-N curve) for the bending fatigue strength of the ADI spur gears are manufactured without any specific surface treatments, and have been obtained by post-processing software. It was observed that when the reliability was 50%, the fatigue limit was 304.89 MPa. It has provided a reliable basis to rate the reliability design of the small gearboxes in automation later.

scholarly journals Tooth Root Bending Fatigue Strength of High-Density Sintered Small-Module Spur Gears: The Effect of Porosity and Microstructure

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 599 ◽  
Author(s):  
Vigilio Fontanari ◽  
Alberto Molinari ◽  
Michelangelo Marini ◽  
Wolfgang Pahl ◽  
Matteo Benedetti
Keyword(s):  
Fatigue Strength ◽  
Surface Defect ◽  
Detrimental Effect ◽  
Case Hardening ◽  
Spur Gears ◽  
Tooth Root ◽  
Near Surface ◽  
Bending Fatigue ◽  
Microstructural Constituent ◽  
Bending Fatigue Strength

The present paper is aimed at investigating the effect of porosity and microstructure on tooth root bending fatigue of small-module spur gears produced by powder metallurgy (P/M). Specifically, three steel variants differing in powder composition and alloying route were subjected either to case-hardening or sinter-hardening. The obtained results were interpreted in light of microstructural and fractographic inspections. On the basis of the Murakami a r e a method, it was found that fatigue strength is mainly dictated by the largest near-surface defect and by the hardness of the softest microstructural constituent. Owing to the very complicated shape of the critical pore, it was found that its maximum Feret diameter is the geometrical parameter that best captures the detrimental effect on fatigue.

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