scholarly journals Surface Durability of Ni-Mo Pre-Alloyed Sintered Steel Case-Carburizing Gears with Different Densities and Contact Stress Analysis Using FEM Model Considering Voids

2016 ◽  
Vol 63 (12) ◽  
pp. 995-1001
Author(s):  
Takahiro NAGATA ◽  
Teruie TAKEMASU ◽  
Takao KOIDE ◽  
Satoshi NISHIDA
Keyword(s):  
Stress Analysis ◽  
Contact Stress ◽  
Sintered Steel ◽  
Fem Model ◽  
Surface Durability

Fatigue and Life Prediction

2005 ◽  
pp. 293-309
Keyword(s):  
Fatigue Life ◽  
Stress Analysis ◽  
Fatigue Failure ◽  
Contact Stress ◽  
Life Prediction ◽  
Gear Tooth ◽  
Gear Train ◽  
Tooth Surface ◽  
Bending Stress ◽  
Surface Durability

Abstract This chapter summarizes the various kinds of gear wear and failure and how gear life in service is estimated and discusses the kinds of flaws in material that may lead to premature gear fatigue failure. The topics covered are alignment, gear tooth, surface durability and breakage of gear tooth, life determined by contact stress and bending stress, analysis of gear tooth failure by breakage after pitting, and metallurgical flaws that reduce the life of gears. The chapter briefly reviews some components in the design and structure of each gear and/or gear train that must be considered in conjunction with the teeth to enhance fatigue life.

Comparative study of stress analysis of gears with different helix angle using the ISO 6336 standard and tooth contact analysis methods

2016 ◽  
Vol 230 (7-8) ◽  
pp. 1350-1358 ◽  
Author(s):  
Layue Zhao ◽  
Robert C Frazer ◽  
Brian Shaw
Keyword(s):  
Stress Analysis ◽  
Contact Stress ◽  
Helix Angle ◽  
Contact Analysis ◽  
Bending Stress ◽  
Contact Ratio ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Iso Standard ◽  
Analysis Methods

With increasing demand for high speed and high power density gear applications, the need to optimise gears for minimum stress, noise and vibration becomes increasingly important. ISO 6336 contact and bending stress analysis are used to determine the surface load capacity and tooth bending strength but dates back to 1956 and although it is constantly being updated, a review of its performance is sensible. Methods to optimise gear performance include the selection of helix angle and tooth depth to optimise overlap ratio and transverse contact ratio and thus the performance of ISO 6336 and tooth contact analysis methods requires confirmation. This paper reviews the contact and bending stress predicted with four involute gear geometries and proposes recommendations for stress calculations, including a modification to contact ratio factor Zɛ which is used to predict contact stress and revisions to form factor YF and helix angle factor Yβ which are cited to evaluate bending stress. The results suggest that there are some significant deviations in predicted bending and contact stress values between proposal methods and original ISO standard. However, before the ISO standard is changed, the paper recommends that allowable stress numbers published in ISO 6336-5 are reviewed because the mechanisms that initiate bending and contact fatigue have also changed and these require updating.

scholarly journals Contact stress analysis for a pair of mating gears

2013 ◽  
Vol 57 (1-2) ◽  
pp. 40-49 ◽  
Author(s):  
Seok-Chul Hwang ◽  
Jin-Hwan Lee ◽  
Dong-Hyung Lee ◽  
Seung-Ho Han ◽  
Kwon-Hee Lee
Keyword(s):  
Stress Analysis ◽  
Contact Stress

Geometric and Normal Contact Stress Analysis of a Rolling Tire Footprint

2006 ◽  
Author(s):  
Vladimir Roth ◽  
Brian E. Moore ◽  
John L. Turner
Keyword(s):  
Stress Analysis ◽  
Contact Stress ◽  
Normal Contact Stress ◽  
Normal Contact
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