Tooth surface fatigue strength analysis of hyper conical gear focusing on the internal crack growth

2020 ◽  
Vol 2020 (0) ◽  
pp. S11111
Author(s):  
Sota UENO ◽  
Tatsuya OHMACHI
Keyword(s):  
Fatigue Strength ◽  
Crack Growth ◽  
Tooth Surface ◽  
Internal Crack ◽  
Strength Analysis ◽  
Surface Fatigue ◽  
Conical Gear

Fatigue Failure and Strength Evaluation of Traction Drive Rollers

2000 ◽  
Author(s):  
Masana Kato ◽  
Gang Deng ◽  
Masashi Yamanaka ◽  
Ryoji Yamamoto ◽  
Noboru Ono ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Crack Growth ◽  
Surface Crack ◽  
Traction Force ◽  
Fatigue Tests ◽  
Slip Ratio ◽  
Traction Drive ◽  
Surface Fatigue ◽  
Surface Crack Growth

Abstract The surface fatigue failures of the traction drive rollers are different to that of gears and bearings because of the high traction force, skew and small slip ratio. In this research, fatigue tests of traction rollers were performed in different slip ratios and skew angles. The effects of running conditions on the fatigue lives of traction drive rollers are clarified and explained based on the surface crack growth and wear situations. Although a higher slip ratio will make a lower fatigue life, the fatigue strength will increase inversley under the skew conditions, because of the differences in mechanical and tribological condition for surface crack growth and the severe surface wear, which diminishes the surface crack length. For evaluation of the effects of such as slip ratio and skew on the fatigue strength of traction rollers, a new method is put forward in which the relationship between the surface temperature index and fatigue life is used instead of S-N curve.

scholarly journals OS1536 Fatigue strength and surface and internal crack growth behavior of cold tool steel SKD11

2013 ◽  
Vol 2013 (0) ◽  
pp. _OS1536-1_-_OS1536-3_
Author(s):  
Daisuke SATO ◽  
Sotomi ISHIHARA ◽  
Kenichi MASUDA ◽  
Noriyasu OGUMA ◽  
Noritaka KUSHIDA ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Crack Growth ◽  
Tool Steel ◽  
Growth Behavior ◽  
Internal Crack ◽  
Crack Growth Behavior

Tooth Surface Fatigue Strength of Normalized Steel Conical Involute Gears

2000 ◽  
Author(s):  
Tatsuya Ohmachi ◽  
Koji Iizuka ◽  
Hidenori Komatsubara ◽  
Ken-ichi Mitome
Keyword(s):  
Fatigue Strength ◽  
Contact Stress ◽  
Testing Machine ◽  
Hertzian Contact ◽  
Tooth Surface ◽  
Paper Test ◽  
Surface Fatigue ◽  
Involute Gears ◽  
Conical Gears ◽  
Hertzian Contact Stress

Abstract The tooth surface fatigue strength of the conical involute gear is evaluated in this paper. Test gears are straight intersecting-axis conical gears. The material of the test gear is normalized steel. The power circulating testing machine is used in this experiment. The circulating torque is kept constant and the number of times of contact is 107. The tooth surface life is evaluated by the pitting area rate. The critical value of the circulating torque is found between 147 N·m and 157 N·m. For critical torque, the pitting area rate does not progress over 4%. The Hertzian contact stress of the test gear is calculated at the circulating torque. The contact stress should be evaluated in consideration of the wearing effects.

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