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Friday, May 1, 2020 | History

2 edition of Physical analysis of pitting in rolling and sliding discs. found in the catalog.

Physical analysis of pitting in rolling and sliding discs.

Yuk Lun WU

Physical analysis of pitting in rolling and sliding discs.

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  • 36 Currently reading

Published by University of Aston in Birmingham. PhysicsDepartment in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Aston in Birmingham 1980.

ID Numbers
Open LibraryOL13774481M

The analysis is continued with inspection of symptoms of adhesive wear. None of the symptoms related to adhesive wear are found, either. Finally, by inspecting electrical current leakage symptoms, the presence of small pitting is found after magnification of the raceway surface. This verified the current leakage failure : Stuart Courtney. Gear Pitting and Lubrication Pitting occurs when fatigue cracks are initiated on the tooth surface or just below the surface. Gear Lubricant Characteristics and Viscosity Gear lubricant must possess the following characteristics: Gear Scuffing Wear Gear scuffing can occur when there is substantial sliding between a lubricated rolling contact. Orienteering is a group of sports that require navigational skills using a map and compass to navigate from point to point in diverse and usually unfamiliar terrain whilst moving at speed. Participants are given a topographical map, usually a specially prepared orienteering map, which they use to find control points. Originally a training exercise in land navigation for military officers.   The film thickness ratio or lambda ratio gives the relationship between minimum film thickness in a contact and the composite surface roughness. The following equations give the film thickness ratio, often referred to as lambda, and the composite surface roughness, which combines the roughness of both contacting surfaces into an equivalent value.

  M uch of George Marshall’s western Destry Rides Again ingeniously pivots on a single set: a saloon the size of a ballroom, with many floors teeming with an array of hearty male drunks. There’s no logical rationale for the existence of such a building in a small town somewhere west of nowhere, though the symbolic justification is robust, as this saloon is understood to be the soul of /5.


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Physical analysis of pitting in rolling and sliding discs. by Yuk Lun WU Download PDF EPUB FB2

Physical analysis of pitting in rolling and sliding discs Author: Wu, Yuk L. ISNI: Awarding Body: University of Aston in Birmingham Current Institution: Aston University Date of Award: Availability of Full Text: Cited by: 2.

Sorry, our data provider has not provided any external links therefore we are unable to provide a link to the full : Yuk L. Physical analysis of pitting failure with an extreme-pressure additive in rolling and sliding steel discs Author: Phillips, Martin : Martin R.

Phillips. The observation of pitting failure usually begins after the appearance of cracks or after pitting [7, 8], although Dawson [9] and Kobayashi [10] followed the development of pitting in discs at different intervals during its life to pitting, using a % C by: 3. Rolling-Sliding Contact Fatigue of Surfaces with Sinusoidal Roughness.

where excessive wear and severe pitting failures originate. of friction in the analysis of rolling–sliding contact. By varying the relative speeds of the discs (i.e. changing the ratio of sliding to rolling velocity, the so-called ‘slip ratio’) and the normal load, the conditions experienced by gear teeth in contact may be simulation of gears can never be truly representative however, since changes in sliding velocity, tooth flexibility and differences Physical analysis of pitting in rolling and sliding discs.

book the thermal conditions make contact conditions Cited by: Debris: Removal Fractal Analysis Formation Ferrography Monitoring. Contact: Sliding Static Rolling Fretting Elastic Conformal Plastic Welding Uniaxial Seizure Non-conformal Shakedown Pitting Failure Scuffing Deformation Point Area Line Temperature Reciprocating.

Metal: Wear Metal working Machining Forming. Intermetallic alloy. Polymer. Elastomer. The first part of this book concerns the fundamentals of “Design for lifetime performance and reliability”, including design procedures to estimate and improve machine reliability, failure analysis, fatigue strength, static and dynamic load rating of concentrated contacts, friction phenomena, Physical analysis of pitting in rolling and sliding discs.

book. pitting measurements. Extent of Pitting Mass Loss—Metal mass loss is not ordinarily recom-mended for use as a measure of the extent of pitting unless general corrosion is slight and pitting is fairly severe.

If uniform corrosion is significant, the contribution of pitting to total metal loss is small, and pitting damage cannot be. Friction and Wear Measurement Techniques The Importance of Testing in Tribology Wear or Surface Damage Classification of Tribotests Tribotest Planning Evaluation of Wear Processes Tribotests — Selected Examples Abrasive Wear Erosive Wear Wear in Sliding and Rolling Contacts Very Mild Wear.

Recently, it has been shown that the decay of martensite also occurs in specimens subjected to rolling/sliding loading (both discs Physical analysis of pitting in rolling and sliding discs.

book gears) affected by micropitting. The decay of martensite gives rise to preferential sites for crack nucleation and by: Rolling contact fatigue pitting is a degradation phenomenon that can take place on any device subjected to cyclic, highly localized, rolling/sliding contacts, where (for steels) momentary surface contact pressures exceed 1 GPa.

This phenomenon should not be confused with more general structural fatigue, which often takes place at the same time, as in the bending fatigue of gear teeth or piston-rings.

An experimental study was carried out on a twin-disc machine to study the influence of various parameters on the resistance to micropitting of steel discs. The slide-to-roll ratio (SRR = sliding. In the twin disc equipment used, the two discs were in rolling/sliding contact against each other under controlled load.

The lower Physical analysis of pitting in rolling and sliding discs. book was partly submerged in the oil and provided the lubricant also into the contact. Friction force was measured during the tests from the axial torque of the lower by: Tribology of Rolling Bearings Suggested Reading.

6 Interface Temperature of Sliding Surfaces. Introduction. Thermal Analysis. Interface Temperature Measurements. Closure Author: Hung Nguyen-Schaefer. rolling-sliding conditions in boundary lubrication regime.

To measure the thickness of the reaction layer formed on the contacting surfaces, Spacer Layer Interferometry Method (SLIM) was used in this study.

A detailed discussion regarding the test rig can be found in Ref [4, 32]. Except to the pitch point, there is the possibility of sliding as well as rolling in all contact points. In the pitch point exists only rolling motion.

The tangential sliding force (friction force) causes a significant effect on the stress when compared to the situation where there is only the pure rolling.

Design for pitting (surface crack initiated rolling fatigue wear) at rolling-sliding contact surface under mixed lubrication condition is based on the combination of maximum contact pressure.

Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives. based tool for analyzing contact mechanics in gears.

Vicura AB is an engineering company that delivers products which are used in different mechanical transmission systems and electrical drivelines.

The company was founded in and is majority owned by Fouriertransform AB. 5.  A disc A of mass m sliding over a smooth horizontal surface with velocity v experiences a perfectly elastic collision with a smooth stationary wall at a point O. The angle between the motion direction of the disc and normal to the wall is equal to α.

Optical profilers are valuable tools for wear analysis, regardless of whether the wear is the result of actual use, or wear testing with a tribometer.

Examples of tribology-related surface features that can be quantified with ZYGO optical profilers are: wear tracks, scratches, pitting, microstructural cracks, indentation, and material removed due to actions such as spalling and adhesion.

Series A, Mathematical and Physical Sciences (), pp.DOI /rspa (). This study shows the first experimental results of highly-loaded rolling-sliding contact. The following is a highly- abbreviated and condensed excerpt from Dr.

Ding’s book on one of the most common causes of rolling element bearing failure: contact fatigue. Fatigue Wear Particle Analysis - Rolling Element Bearings. Surface fatigue wear, also called rolling contact fatigue, predominantly occurs in rolling element bearings.

The oils’ frictional behaviour was characterized in a ball-on-disc test rig. The pitting lives of two of these oils were measured using rolling four-ball tests and compared to two of the oils from paper D and E: These two papers focussed on studies performed by using twin-disc rolling/sliding by: 2.

To discuss spalling and pitting on a common ground, the following discussion rests on the definitions according to the phenomena as described in the foregoing; that is, pitting is the formation of shallow craters by surface-defect fatigue, and spalling is the formation of deeper cavities by.

A rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements (such as balls or rollers) between two bearing rings called relative motion of the races causes the rolling elements to roll with very little rolling resistance and with little sliding.

One of the earliest and best-known rolling-element bearings are sets of logs. Lecture Notes on Classical Mechanics (A Work in Progress) Daniel Arovas Department of Physics University of California, San Diego May 8, File Size: 7MB.

the flat surface of the glass disc. The load is applied by moving the disc downwards towards the ball. The disc is mounted on a shaft driven by an electric motor. The steel ball is also controlled by an electrical motor, allowing to run the tests under rolling/sliding conditions.

The glass disc is coated with a Cited by: There has been proposed an innovative thermal treatment of bearing steel CrMnSi, where the existing standard heat treatment has been replaced by austempering. The structure of low-temperature tempered martensite has been replaced by a microstructure composed of martensite and lower bainite with midrib.

The kinetics of bainitic transformation and isothermal martensitic transition at Cited by: 1. ASTM's corrosion and wear standards provide the appropriate procedures for carrying out corrosion, wear, and abrasion tests on specified metallic materials and alloys.

These tests are conducted to examine and evaluate the behavior, susceptibility, and extent of resistance of certain materials to stress corrosion cracking, cavitation erosion. The Ergonomics of Manual Material Handling Manual Material Handling (MMH) tasks are physical work activities that involve exertion of considerable force because a particular load is heavy or the cumulative loads during a workday are heavy.

Examples of MMH tasks include lifting or lowering, carrying, and pushing or pulling. Sliding material and bushing type selection guides.

Selecting bearing size. Machinability of composite materials. Friction. Lubrication. Mounting. Bushings. Thrust washers. Strips. Magnetic bearings and systems. Industrial seals. Power transmission seals.

Principles of sealing selection and application. Selection of seal design and. The Ra of the ground discs was about μm (16 μin), and the Ra of the superfinished discs was less than μm (4 μin).

They found that compared with the ground discs, the superfinished discs had a significantly higher scuffing load capacity when lubricated with turbine engine oil and subjected to high rolling and sliding speeds. Macro-size contact fatigue (pitting) is one of the more commonly encountered and that ultimately limits the life of the this work, experimental pitting life studies have been conducted using rolling four-ball and twin-disc test setups to analyse the impact of various gear oils’ physical and chemical properties on pitting during Author: Jens Johansson.

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Physical Examination for the Spine And Extremities/5(5). Tribology is the study of the science and technology of interacting surfaces in relative motion and encompasses the study and application of friction, wear, lubrication and related design aspects. To further understand tribology, it is important to understand the definitions behind friction, wear and Author: Noria Corporation.

Two kinds of kinetic friction exist: sliding and rolling friction. When you push a book across a table top, the resistance you experience is caused by sliding friction. When you push a wheelbarrow over the ground, the resistance you feel is caused by rolling friction.

In general, rolling friction is always less than sliding. Motors & Drives; Wave Springs Pack More Force Into Less Space. Free Whitepaper: Flat wire wave springs offer significant advantages over traditional spring designs such as coils and discs. Laboratory Manual Of Physical Chemistry Paperback pdf Ma by Albert W.

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