The effect of surface integrity on contact performance of carburized gear

Gear contact fatigue is one of the most significant limitations to improving the contact performance and reliability. Carburizing is extensively applied to enhance contact performance by forming a hard case and a tough core in gears. This procedure introduces initial residual stress and hardness gra...

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Bibliographic Details
Published inJournal of the Brazilian Society of Mechanical Sciences and Engineering Vol. 43; no. 11
Main Authors Cheng, Shali, Zhou, Ye, Bai, Houyi, Feng, Houbin
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2021
Springer Nature B.V
Subjects
Carburizing
Compressive properties
Contact stresses
Elastohydrodynamic lubrication
Elastoplasticity
Engineering
Fatigue life
Film thickness
Hardness
Lubrication
Mechanical Engineering
Mechanical properties
Performance evaluation
Residual stress
Stress distribution
Surface roughness
Technical Paper
Carburized gear
Contact analysis
Residual stress
Plasto-elastohydrodynamic lubrication (PEHL)
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Summary:Gear contact fatigue is one of the most significant limitations to improving the contact performance and reliability. Carburizing is extensively applied to enhance contact performance by forming a hard case and a tough core in gears. This procedure introduces initial residual stress and hardness gradient, which makes a significant challenge for contact analysis and fatigue life evaluation of carburized gear. In this paper, a plasto-elastohydrodynamic lubrication (PEHL) model considering surface roughness, hardness gradient and initial residual stress is developed to evaluate the contact performance of carburized gear. The effects of surface topography and gradients of mechanical properties on gear contact state are investigated. The elastohydrodynamic lubrication and the elastoplastic contact are coupled by the general film thickness equation. The variation of yield limit along the depth direction is represented by hardness gradient. The initial residual stress is superimposed on to the load induced elastoplastic stress field. The results show that the compressive residual stress causes a remarkable increase in contact performance. For high roughness, the influence of residual stress on contact performance is limited.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-021-03183-2