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.

Effects of Case Depth, Side-Face Carburizing and Helix Angle on Residual Stress and Bending Fatigue Strength of Case-Carburized Helical Gears

2009 ◽  
Author(s):  
Kouitsu Miyachika ◽  
Kazuaki Ando ◽  
Wei-Dong Xue ◽  
Imaduddin Helmi Bin Wan Nordin
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Three Dimensional ◽  
Helix Angle ◽  
Fatigue Tests ◽  
Case Depth ◽  
Bending Fatigue ◽  
Helical Gears ◽  
Side Face ◽  
Bending Fatigue Strength

This paper presents a study on effects of case depth, side-face carburizing and helix angle on the residual stress and the bending fatigue strength of case-carburized helical gears. The carbon content of each element of the FEM gear models due to carburizing was obtained. A heat conduction analysis and an elastic-plastic stress analysis in the case-carburizing process of helical gears were carried out by the three-dimensional finite-element method, and then residual stresses were obtained. Effects of the case depth, the side-face carburizing, the helix angle and the face width on the residual stress of case-carburized helical gears were determined. Bending fatigue tests were carried out for case-carburized helical gears and S-N curves and bending fatigue limit loads were obtained. Effects of the case-depth, the side-face carburizing and the helix angle on the bending fatigue strength of the case-carburized helical gear were determined.

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.

Bending Fatigue Tests of High Speed Spur Gears

1981 ◽  
Vol 103 (2) ◽  
pp. 466-473 ◽  
Author(s):  
I. Yuruzume ◽  
H. Mizutani
Keyword(s):  
High Speed ◽  
Normal Load ◽  
Load Capacity ◽  
Spur Gear ◽  
Fatigue Tests ◽  
Spur Gears ◽  
Bending Fatigue ◽  
Tooth Width ◽  
Bending Load ◽  
Bending Fatigue Strength

Effects of addendum modification of tooth profiles on the bending fatigue strength of high speed spur gear are discussed in this presentation: A JIS Class O Spur gear of m3, α20 deg, Z1 27, and made of AMS 6260 (AISI 9310) steel precisely ground after carburizing and hardening was meshed with the other gear of Z2 77 and operated at 8550 rpm. In this running test, bending load capacity and running performance comparisons between the gear with standard tooth profile and the two shifted gears of which tooth addendum modification coefficients were 0.35 and 0.8. The maximum normal load of the gear with addendum modification coefficient 0.8 at 107 (10 million) cycles was 1.8 kNsmm per unit tooth width. The maximum Hertz stress of this gear was 2.43 × 109 Nsm2. The allowable normal load of the gear with 0.8 was higher than that of the standard gear by 87 percent and higher than of the 0.35 profile shifted gears by 20 percent.

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

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

Comparative bending fatigue strength of precision forged spur gears

1997 ◽  
Vol 211 (4) ◽  
pp. 293-299 ◽  
Author(s):  
O Eyercioglu ◽  
D Walton ◽  
T A Dean
Keyword(s):  
Fatigue Strength ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Spur Gears ◽  
Test Fixture ◽  
Bending Fatigue ◽  
Gear Teeth ◽  
Root Area ◽  
Bending Fatigue Strength

To determine the bending fatigue strength of precision forged spur gears and to compare the results with those obtained from conventional cut gears, single tooth bending fatigue tests were carried out on both through-hardened and induction-hardened gear teeth. The gears were produced from rolled bar cut blanks, disc forged blanks or precision forged teeth blanks. For this purpose, a special test fixture was designed and built for an Amsler high-frequency vibrophore fatigue testing machine. The results show that the endurance limit of precision forged gears is significantly higher than those obtained from cut gears. The bending fatigue strength of forged gears was some 12.5 per cent higher than the cut teeth in a through-hardened condition and 8.4 per cent higher for the induction-hardened teeth. The effect of surface roughness at the tooth root area on the bending fatigue strength of the forged gears is also shown.

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