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Rolling Contact Fatigue Life Investigation of Through and Case Hardened Bearing Steels Using Experimental Testing and Finite Element Modeling
Başlık:
Rolling Contact Fatigue Life Investigation of Through and Case Hardened Bearing Steels Using Experimental Testing and Finite Element Modeling
Yazar:
Londhe, Nikhil Dnyaneshwar, author.
ISBN:
9780438120907
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (207 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Özet:
Since beginning of twentieth century, bearing manufacturers and aircraft engine manufacturers have sought to predict the fatigue endurance capabilities of rolling element bearings. The first generally accepted method to predict bearing fatigue life was published in 1940s by Lundberg and Palmgren (LP). Their work is based on Hertz theory which assumes perfectly smooth contact between two homogeneous elastic solids free from any pre-loaded condition. However, most of the modern bearing materials, such as case-hardened steels, do not satisfy these conditions. Recent, Micro/Nano indentation studies have shown inhomogeneous microstructure of these materials which leads to graded material properties in the subsurface region. Also, carburization process induces beneficial compressive residual stresses which significantly alters the subsurface stress distribution of the Hertzian contact loads. Moreover, influence of metal plasticity is not considered in rolling contact fatigue life prediction under elastic-plastic loading conditions. Therefore, bearing life predictions using LP derived fatigue life models significantly under predict endurance performance of modern bearing steels. These leads to use of oversized bearing components, reducing the efficiency of critical mechanical and engineering systems. Hence this dissertation research is focused on correcting this under prediction of fatigue lives for modern case-hardened bearing steels. Using computational tools, in depth analysis of rolling element bearings components under different operating conditions is presented. For case-carburized steels, accurate subsurface stress fields are determined by incorporating microstructure specific material properties in the subsurface region of bearing raceways. The expected improvement in fatigue lives of case carburized steel is analyzed due to combined effect of graded material properties and residual compressive stresses. Rolling contact fatigue performance of through hardened bearing steel is investigated under elastic-plastic loading condition. Importance of metal plasticity in fatigue life prediction under these conditions is highlighted. This will help in bridging existing gap between predicted and experimentally observed fatigue lives of modern bearing steels, thereby enabling reliable bearings design.
Notlar:
School code: 0070
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
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XX(696614.1) | 696614-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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