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.

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.

B02 Effects of Tempering on Bending Fatigue Strength of Case-Carburized Spur Gears

2008 ◽  
Vol 2008 (0) ◽  
pp. 49-50
Author(s):  
Seigo NISHIMURA ◽  
Kazuaki ANDO ◽  
Kouitsu MIYACHIKA ◽  
Takao KOIDE ◽  
Chiaki NANBA ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
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

2728 Effects of Gear-Side Case-Carburizing and Tooth Bearing on Bending Fatigue Strength of Case-Carburized Spur Gears

2005 ◽  
Vol 2005.4 (0) ◽  
pp. 179-180
Author(s):  
Kouitsu MIYACHIKA ◽  
Wei-Dong XUE ◽  
Kouji OKAMURA ◽  
Shinya MORISHITA ◽  
Chiaki NAMBA ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Spur Gears ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

42CrMo Hard Surface Gear Intensity Tests and Modified Parameter Correction

2012 ◽  
Vol 246-247 ◽  
pp. 145-148
Author(s):  
Nai Gen Li ◽  
Nan Xu ◽  
Nian Jun Zhang ◽  
Meng Guo Zhu
Keyword(s):  
Fatigue Strength ◽  
Gear Tooth ◽  
Coincidence Degree ◽  
High Strength ◽  
Tooth Root ◽  
Bending Fatigue ◽  
Hard Surface ◽  
Basic Parameters ◽  
Bending Fatigue Strength ◽  
Research Intensity

Hard surface gears drive is considering mainly how to improve the tooth root bending fatigue strength and wear resistance of the teeth. Based on the analysis of sliding ratio, coincidence degree and the gear tooth root bending fatigue strength, basic parameters of gear can be modified to improve strength. Although these gears must be cut by the standard tools, high strength gears are needed in machinery. In this research, intensity experiments were conducted with 42CrMo modified and standard hard surface gears. Experiment results show that the improvements of 42CrMo gear parameters are effective and teeth strength is improved for the modified parameters of gears.

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