Journal
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
Volume 135, Issue 1, Pages -Publisher
ASME
DOI: 10.1115/1.4007693
Keywords
gear lubrication; micro-EHL; surface fatigue; micropitting
Categories
Funding
- UK Engineering and Physical Sciences Research Council [EP/G06024X/1]
- British Gear Association
- Rolls-Royce Goodrich Engine Control Systems Ltd.
- EPSRC [EP/G06024X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G06024X/1] Funding Source: researchfish
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The paper describes results obtained from the micro-elastohydrodynamic lubrication (micro-EHL) modeling of the gear tooth contacts used in micropitting tests together with a contact fatigue and damage accumulation analysis of the surfaces involved. Tooth surface profiles were acquired from pairs of helical test gears and micro-EHL simulations were performed corresponding to surfaces that actually came into contact during the meshing cycle. Plane strain fatigue and damage accumulation analysis shows that the predicted damage is concentrated close to the tooth surfaces and this supports the view that micropitting arises from fatigue at the asperity contact level. A comparison of the micropitting performance of gears finish-ground by two alternative processes (generation-grinding and form-grinding) suggests that 3D waviness may be an important factor in explaining their different micropitting behavior. [DOI: 10.1115/1.4007693]
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