Download or read book Rolling Bearing Life Prediction Theory and Application written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-23 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: A tutorial is presented outlining the evolution, theory, and application of rolling-element bearing life prediction from that of A. Palmgren, 1924; W. Weibull, 1939; G. Lundberg and A. Palmgren, 1947 and 1952; E. Ioannides and T. Harris, 1985; and E. Zaretsky, 1987. Comparisons are made between these life models. The Ioannides-Harris model without a fatigue limit is identical to the Lundberg-Palmgren model. The Weibull model is similar to that of Zaretsky if the exponents are chosen to be identical. Both the load-life and Hertz stress-life relations of Weibull, Lundberg and Palmgren, and Ioannides and Harris reflect a strong dependence on the Weibull slope. The Zaretsky model decouples the dependence of the critical shear stress-life relation from the Weibull slope. This results in a nominal variation of the Hertz stress-life exponent. For 9th- and 8th-power Hertz stress-life exponents for ball and roller bearings, respectively, the Lundberg-Palmgren model best predicts life. However, for 12th- and 10th-power relations reflected by modern bearing steels, the Zaretsky model based on the Weibull equation is superior. Under the range of stresses examined, the use of a fatigue limit would suggest that (for most operating conditions under which a rolling-element bearing will operate) the bearing will not fail from classical rolling-element fatigue. Realistically, this is not the case. The use of a fatigue limit will significantly overpredict life over a range of normal operating Hertz stresses. (The use of ISO 281:2007 with a fatigue limit in these calculations would result in a bearing life approaching infinity.) Since the predicted lives of rolling-element bearings are high, the problem can become one of undersizing a bearing for a particular application. Rules had been developed to distinguish and compare predicted lives with those actually obtained. Based upon field and test results of 51 ball and roller bearing sets, 98 percent of these bearing sets had acceptable l

Download or read book Rolling Bearing Life Prediction Past Present and Future written by and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ball and Roller Bearings written by Johannes Brändlein and published by John Wiley & Sons. This book was released on 1999-03-12 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the third edition of the standard work for all engineers concerned with rolling bearings - in design and development; in production and operation; in maintenance and repair; in purchasing and materials management. Fully revised, features new to this edition include: * coverage of the new 'adjusted life' calculation, which takes into account the endurance strength of rolling bearings in relation to factors such as the cleanliness of the lubricant and the design of the bearing housing using the flow of force * expanded chapter on lubrication The information in this book will help bearing engineers make real-life improvements to the capacity and operational reliability of bearings in vehicles, machines, equipment and plants, saving on both time and costs. This book is an essential reference to the fundamental correlations of bearing engineering, and to all aspects of bearing design and technology.

Download or read book Rolling Bearing Tribology written by Gary L. Doll and published by Elsevier. This book was released on 2022-08-20 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rolling Bearing Tribology: Tribology and Failure Modes of Rolling Element Bearings discusses these machine elements that are used to accommodate motion on or about shafts in mechanical systems, with ball bearings, cylindrical roller bearings, spherical roller bearings, and tapered roller bearings reviewed. Each bearing type experiences different kinds of motion and forces with their respective raceway, retainers and guiding flanges. The material in this book identifies the tribology of the major bearing types and how that tribology depends upon materials, surfaces and lubrication. In addition, the book describes the best practices to mitigate common failure modes of rolling element bearings. Discusses important tribological implications surrounding the performance and durability of rolling element bearings Describes how the different types of roller bearings work Explores the reasons behind the failure of roller bearings and presents information on how to mitigate those failures

Download or read book Ball and Roller Bearing Engineering written by Arvid Palmgren and published by . This book was released on 1959 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Palmgren Revisited A Basis for Bearing Life Prediction written by and published by . This book was released on 1997 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rolling Contact Fatigue Testing Bearing Life Prediction and Steel Properties written by Thore B. Lund and published by . This book was released on 2012 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few rolling bearing users realize that the fundamentals of bearing life predictions are based on experimental data derived under conditions very different from the ones generally used in RCF testing today. The basic life formulas derived in the 1940s largely were based on tests run on steel with very different characteristics than the materials used to produce bearing components today. Still, the fundamental life calculations are based on the (C/P)n concept, which was experimentally derived by Lundberg and Palmgren (Lundberg, G. and Palmgren, A., "Dynamic Capacity of Rolling Bearings," Acta Polytech. Scand., Mech. Eng. Ser., Volume 1, No. 3, 1947), even if the basic equation has been expanded and adjusted to reflect the lives recorded for modern bearings and to incorporate the concept of a fatigue limit (Ioannides, E., Bergling, G., and Gabelli, A., "An Analytical Formulation for the Life of Rolling Bearings," Acta Polytech. Scand., Mech. Eng. Ser., Volume 137, 1999, pp. 9-12, 21-24). In an attempt to better understand the premature and unpredictable failures that sometimes occur in certain industrial applications today, the test procedures used by Lundberg and Palmgren have been revisited, and data have been derived that might contribute to an understanding of the short lives sometimes experienced in certain industrial bearing applications. Based on this test procedure, a better understanding of the development of micro-crack associated plastic deformations at non-metallic inclusions also has been gained. The propensity of different non-metallic inclusions to drive the formation and growth of micro-cracks has been studied in detail, and this knowledge has been used to develop steel that is less prone to butterfly development and micro-crack growth under very high contact stress conditions. Today's bearing life prediction models presume that the Palmgren-Miner rule of accumulated damage is globally applicable. Experimental data questioning this assumption are presented.

Download or read book Advanced Dynamics of Rolling Elements written by P.K. Gupta and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: In any rotating machinery system, the bearing has traditionally been a crit ical member of the entire system, since it is the component that permits the relative motion between the stationary and moving parts. Depending on the application, a number of different bearing types have been used, such as oil-lubricated hydrodynamic bearings, gas bearings, magnetic suspensions, rolling element bearings, etc. Hydrodynamic bearings can provide any desired load support, but they are limited in stiffness and the associated power loss may be quite large. Gas bearings are used for high-precision applications where the supported loads are relatively light, bearing power losses are very low, and the rotating speeds generally high. For super precision components where no frictional dissipation or bearing power loss can be tolerated, magnetic suspensions are employed; again, the load support requirements are very low. Rolling element bearings have been widely used for those applications that require greater bearing versatility, due to the requirements for high-load and high-stiffness characteristics, while allowing moderate power loss and permitting variable speeds. A study of the dynamic interaction of rolling elements is, therefore, the subject of this text. Texts covering the analysis and design methodology of rolling elements are very limited. Notable works include Analysis of Stresses and Deflections (Jones, 1946, Vols. I and II), Ball and Roller Bearings, Their Theory, Design and Application (Eschmann, Hasbargen, and Weigand, 1958), Ball and Roller Bearing Engineering (Palmgren, 1959, 3rd ed. ), Advanced Bearing Technology (Bisson and Anderson, 1965), and Rolling Bearing Analysis (Harris, 1966).

Download or read book Ball and Roller Bearings written by Paul Eschmann and published by . This book was released on 1958 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rolling Bearing Analysis 2 Volume Set written by Tedric A. Harris and published by CRC Press. This book was released on 2006-11-02 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the last four decades, Tedric Harris' Rolling Bearing Analysis has been the "bible" for engineers involved in rolling bearing technology. Why do so many students and practicing engineers rely on this book? The answer is simple: because of its complete coverage from low- to high-speed applications and full derivations of the underlying mathematics from a leader in the field. Updated, revamped, and reorganized for the new millennium, the fifth incarnation of this classic reference is the most modern, flexible, and interactive tool in the field. What makes this edition so revolutionary? For starters, the coverage is split conveniently into two books: Essential Concepts of Bearing Technology introduces the fundamentals involved in the use, design, and performance of rolling bearings for more common applications; Advanced Concepts of Bearing Technology delves into more advanced topics involving more dynamic loading, more extreme conditions, and higher-speed applications. Furthermore, each book in this edition includes a CD-ROM that contains numerical examples as well as tables of dimensional, mounting, and life-rating data obtained from ABMA/ANSI standards. Whether you are interested in the mathematics behind the empirical values or methods for estimating the effects of complex stresses on fatigue endurance, Rolling Bearing Analysis, Fifth Edition compiles the techniques and the data that you need in a single, authoritative resource.

Download or read book Bearing Steels written by J. J. C. Hoo and published by ASTM International. This book was released on 1975 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Limit Stress A New and Superior Criterion for Life Rating of Rolling Bearing Materials written by TA. Harris and published by . This book was released on 2002 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rolling bearings are rated for their capabilities to withstand rolling contact fatigue. All other means of bearing failure are considered preventable through proper attention to bearing manufacture, mounting, lubrication, and minimization of contaminant ingress. The standard methods for calculation of rolling bearing capacities and fatigue lives are based on the 1947 and 1952 publications of Lundberg and Palmgren. They defined separate material factors for ball bearings and roller bearings fabricated from 52100 steel, through-hardened to at least 58 Rockwell C; the fatigue life predictions, were strongly influenced by these capacity-multiplying factors. The standard was in use for less than five years, when it became apparent bearings fabricated from ever-cleaner materials; for example vacuum degassed and vacuum melted steels, were out-performing standard life predictions. Moreover, tapered and cylindrical roller bearings routinely fabricated from carburizing steels such as SAE 4118, 4320, 8620, etc. were not directly covered by the standards. This deficiency is accommodated by the use of material-life factors applied to the Lundberg-Palmgren life equations. The Society of Tribologists and Lubrication Engineers (STLE) recommends the use of separate material-life factors to cover basic steel metallurgy, heat treatment, and metal shaping. It has been demonstrated that, together with other life factors for lubrication effectiveness and contamination, this cascading of life factors is insufficiently accurate to predict life because in most cases, these effects on bearing endurance are interdependent.

Download or read book Grease Lubrication in Rolling Bearings written by Piet M. Lugt and published by John Wiley & Sons. This book was released on 2013-02-18 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive book on the science of grease lubrication for roller and needle bearings in industrial and vehicle engineering. Grease Lubrication in Rolling Bearings provides an overview of the existing knowledge on the various aspects of grease lubrication (including lubrication systems) and the state of the art models that exist today. The book reviews the physical and chemical aspects of grease lubrication, primarily directed towards lubrication of rolling bearings. The first part of the book covers grease composition, properties and rheology, including thermal and dynamics properties. Later chapters cover the dynamics of greased bearings, including grease life, bearing life, reliability and testing. The final chapter covers lubrications systems – the systems that deliver grease to the components requiring lubrication. Grease Lubrication in Rolling Bearings: Describes the underlying physical and chemical properties of grease. Discusses the effect of load, speed, temperature, bearing geometry, bearing materials and grease type on bearing wear. Covers both bearing and grease performance, including thermo-mechanical ageing and testing methodologies. It is intended for researchers and engineers in the petro-chemical and bearing industry, industries related to this (e.g. wind turbine industry, automotive industry) and for application engineers. It will also be of interest for teaching in post-graduate courses.

Download or read book Proceedings of the 7th International Conference on Fracture Fatigue and Wear written by Magd Abdel Wahab and published by Springer. This book was released on 2018-07-14 with total page 819 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings gather a selection of peer-reviewed papers presented at the 7th International Conference on Fracture Fatigue and Wear (FFW 2018), held at Ghent University, Belgium on 9–10 July 2018. The contributions, prepared by international scientists and engineers, cover the latest advances in and innovative applications of fracture mechanics, fatigue of materials, tribology and wear of materials. The book is intended for academics, including graduate students and researchers, as well as industrial practitioners working in the areas of fracture fatigue and wear.

Download or read book Advanced Concepts of Bearing Technology written by Tedric A. Harris and published by CRC Press. This book was released on 2006-10-09 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of the fifth edition of the classic Rolling Bearing Analysis, this book examines bearing performance and service life for more complex loading, more extreme operating conditions, and higher-speed applications. Several topics are unique to this work, including mathematical relationships for internal load distribution under conditions of high speed, combined radial, axial, and moment loading, as well as the effects of various types of profiling. The authors also delve into the mathematical development of rolling element-raceway lubricant film thickness and contact friction, the stress-life method for calculating bearing fatigue, and the effects of shaft and supporting structure flexure on bearing loading and deflection.

Download or read book Life Ratings for Modern Rolling Bearings written by Roger Barnsby and published by American Society of Mechanical Engineers. This book was released on 2003 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a calculation method for applying the life rating procedure for ball and roller bearings. This guide includes both surface and subsurface failure modes and the effects on bearing life of material, residual stress, lubrication and contamination in addition to applied loading.

Download or read book Handbook of Lubrication and Tribology written by Robert W. Bruce and published by CRC Press. This book was released on 2012-07-06 with total page 1173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the publication of the best-selling first edition, the growing price and environmental cost of energy have increased the significance of tribology. Handbook of Lubrication and Tribology, Volume II: Theory and Design, Second Edition demonstrates how the principles of tribology can address cost savings, energy conservation, and environmental protection. This second edition provides a thorough treatment of established knowledge and practices, along with detailed references for further study. Written by the foremost experts in the field, the book is divided into four sections. The first reviews the basic principles of tribology, wear mechanisms, and modes of lubrication. The second section covers the full range of lubricants/coolants, including mineral oil, synthetic fluids, and water-based fluids. In the third section, the contributors describe many wear- and friction-reducing materials and treatments, which are currently the fastest growing areas of tribology, with announcements of new coatings, better performance, and new vendors being made every month. The final section presents components, equipment, and designs commonly found in tribological systems. It also examines specific industrial areas and their processes. Sponsored by the Society of Tribologists and Lubrication Engineers, this handbook incorporates up-to-date, peer-reviewed information for tackling tribological problems and improving lubricants and tribological systems. The book shows how the proper use of generally accepted tribological practices can save money, conserve energy, and protect the environment.