Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Rolling contact fatigue"”.
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Rolling contact fatigue of silicon nitride.
Silicon Nitride has traditionally been used as rolling contact bearing material owing to its superior performance compared to bearing steels. Its successful application as a bearing element has led to the development of Silicon Nitride in other rolling contact applications in the automotive …
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ROLLING CONTACT FATIGUE BEHAVIOUR OF CASE-CARBURISED STEELS
… steel disc specimens as a result of rolling contact loading. The study of the surface topography of the run specimen using direct and indirect plastic replica technique and the electron microscope reveals cracks in the roughened area of the specimen and that excessively carburised …
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Development Of Second Generation Rolling Contact Fatigue Tester
<p>Contact fatigue failure has been in research since the early twentieth century. The need for a second generation sliding-rolling contact fatigue tester was proposed by Gregory Dvorak and Dr. Marcellin Zahui. The first generation RCF tester was used for testing super finishing processes for gear …
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Development Of A Slide-Rolling Contact Fatigue Tester
<p>Contact fatigue failure is a common problem experienced in many applications such as bearings, gears and railway tracks. In recent years, research companies have developed finishing processes which aim to improve a component's contact fatigue life. One such process has been patented by REM …
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Evaluation of rolling contact fatigue resistance for coated components
… mechanisms, techniques and machines for testing rolling contact fatigue failure resistance and load capacity of coated components. The thesis investigates both normal and accelerated rolling contact fatigue evaluation test mechanisms and their models, and evaluation test technique principles …
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Microstructural alterations in bearing steels under rolling contact fatigue
… alterations in bearing steels under rolling contact fatigue (RCF) is systematically studied. A literature review summarizes current understanding in this field, leading to the key to the formation of these microstructural features being carbon redistribution as a consequence of cyclic …
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Mechanisms of microstructural damage during rolling contact fatigue of bearing steels
… long operation times, the material undergoes rolling contact fatigue where microstructural damage manifests as dark-etching regions and white-etching areas, which display different properties from the surrounding region. The aim of this study is to identify the mechanisms for such damage and …
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Rolling contact fatigue testing of 9260 steel processed by quenching and partitioning
Includes bibliographical references (pages 121-125).
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Carbide-free bainitic steels for wear and rolling contact fatigue resistant applications
… mechanical properties for wear resistance and rolling contact fatigue. The idea of using carbide free bainitic steels for these kinds of applications is not new; however, a straightforward relationship between microstructural features and the ultimate performance has yet to be found. It is …
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Analytical and experimental investigation of microstructural alterations in bearing steel in rolling contact fatigue
<p>Rolling Contact Fatigue (RCF) is one the most common failure modes in bearings. RCF is usually associated with particular microstructural alterations. Such alterations (i.e. white etching cracks, butterflies, etc.) which lead to RCF failure are known to be among the most concerning matters to …
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Rolling Contact Wear of Hybrid Ceramic Bearings with Refrigerant Lubrication.
… for high efficiency have caused loading bearing contacts in all kinds of machinery to be subjected to high speeds, high contact stresses and severe conditions of lubrication. In addition the introduction of a new generation of hydrocarbon refrigerants in various systems, where these rolling …
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Three-dimensional boundary element and experimental analysis of lubricant ceramic surface ring cracks in rolling contact.
… cracks are located on silicon nitride ceramic rolling elements.The random nature of ring crack position creates difficulties in predicting rolling contact fatigue (RCF) life. The influence of the lubricant, contact pressure and crack geometry on the RCF mechanism is difficult to determine due …
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Microstructural degradation of bearing steels
… clarify one of the most fundamental aspects of fatigue damage in bearings steels through critical experiments, in particular whether damage in the form of cracks precedes hard “white-etching matter" formation, which is carbon supersaturated nanoscaled ferrite. Heat treatments have been designed …
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Defect tolerance assessment of silicon nitride in rolling contact.
… and the critical or tolerable defect sizes for rolling bearing applications. This is achieved by means of both experimental and numerical techniques (for finding crack initiation location). A modified four-ball machine is used for the rolling contact fatigue experiments on star features and …
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Failure modes of silicon nitride rolling elements with ring crack defects
… nitride ceramics have shown some advantages for rolling element bearing applications. In particular hybrid bearings (silicon nitride rolling elements and steel races) have the ability to withstand high loads, severe environments and high speeds. However, the difficulties of both sintering and …
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Influences of surface quality on the rolling contact fatique behaviour of ceramics
… quality has been established. Accelerated rolling contact fatigue tests were performed both under a standard 4-ball and a modified 5-ball rolling configuration, with a ceramic ball as the upper ball and steel balls as lower balls. The tests were conducted at high speed and lubricated …
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Industrial Scalable Rolling Element Bearing Diagnostic and Prognostic Modelling
Rolling element bearings are a critical component in nearly any rotating system. They operate at significant loads and speeds and must withstand various forms of harsh environmental factors. Due to this, they can be prone to rolling contact fatigue failure, especially in industrial applications …
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Physics-Informed Diagnostic and Prognostic Models for Rolling Element Bearings Using Oil Debris Data
Rolling element bearings are susceptible to rolling contact fatigue failure. This poses challenges in industrial applications like wind turbines and aircraft. To address this challenge, the thesis constructs diagnostic and prognostic models due to spalling in the inner raceway. This is achieved by …
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Hydrogen embrittlement resistance in advanced high strength: vanadium bearing and TRIP-assisted steels
… to brittle fracture mode in 100Cr6+0.5V steel. Rolling contact fatigue (RCF) test was also carried out to study the propagation of cracks under rolling contact fatigue conditions. It was concluded that 100Cr6+0.5V steel has longer bearing life and higher resistance to hydrogen embrittlement than …
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Multiscale Modeling of Fatigue and Fracture in Polycrystalline Metals, 3D Printed Metals, and Bio-inspired Materials
… a computational framework to study mechanical fatigue and fracture at different length scales for a broad range of materials. The developed multiscale framework is utilized to study the details of fracture and fatigue for the rolling contact in rails, additively manufactured alloys, and …
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