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Showing 1 to 20 of 50 for “"rolling contact"”.
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Rolling contact orthopaedic joint design
… instead of bio-mimicry, to design prosthetic rolling contact joints, including knee braces, limb prosthetics, and joint prostheses, with the intent of reducing morbidity and complications associated with joint/tissue failure. A deterministic approach to joint design is taken to elucidating six …
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Multi-stable Compliant Rolling-contact Elements
… stable positions, the multistable compliant rolling-contact element(CORE). A CORE is a contact-aided complaint mechanism that eliminates friction and wear by allowing two surfaces to roll on each other. Furthermore, the contact eliminates problems such as poor performance in compression, …
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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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Contact area between cylinders in rolling contact
The contact area between two rollers or cylinders was investigated both theoretically and experimentally. The theoretical investigation was based on Hertzian theory, while the experimental method used was based on the measurement of contact resistances. The variables in the investigation were the …
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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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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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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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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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Effects of Surface Irregularities on the Rolling Contact Stress Problem
Made available in DSpace on 2014-12-12T00:25:47Z (GMT). No. of bitstreams: 1 7212216.pdf: 1724787 bytes, checksum: 2bf0eb582dc2adeaedcab98427e90923 (MD5) Previous issue date: 1971
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Erosion and rolling contact wear mechanisms in silicon nitride hybrid bearings.
… which lead to cavitation. Silicon nitride rolling elements with different sintering additives, properties and microstructure were experimentally studied to understand the nature of cavitation erosion. Advanced surface analysis technique was used study the erosive wear correlation to …
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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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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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Numerical and experimental investigation of shakedown in evolving non-Hertzian rolling contact
The non-conforming rolling contact under high loads results in considerable plastic deformation of the surface. This surface plastic flow is studied using a twin-disk tribometer, and the observed deformation as a function of the number of rolling cycles is classified into three distinct stages. …
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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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Large gain amplification mechanism for piezoelectric actuators utilizing a rolling contact joint
… using a buckling mechanism combined with a novel rolling contact design. Unlike traditional flexure-type monolithic mechanisms, which are accurate but inefficient and fragile, the new mechanism consists of all rolling contact couples, providing high stiffness, durability and energy efficient …
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