By C. M. Taylor
The interdisciplinary nature of tribology encompasses wisdom drawn from disciplines resembling mechanical engineering, fabrics technological know-how, chemistry and physics. The interplay among those assorted fields of information to accomplish the ultimate outcome, the regulate of friction and put on, is reviewed during this quantity. This interdisciplinary process has confirmed to be a really winning means of studying friction and put on difficulties. in lots of situations tribology is considered as an inaccessible topic which doesn't produce priceless solutions. during this quantity the authors redress this challenge by means of supplying a complete therapy of the topic. A easy function of this e-book is the emphasis on describing quite a few strategies in an obtainable demeanour for the advantage of non-specialists. This precept is utilized from the start of the ebook, the place the reader is brought to the basic proposal of tribology. this idea is then usually used to teach how a number of the themes in tribology are interrelated to shape one coherent topic. an instantaneous graphical representation of the mechanisms controlling tribological phenomena is gifted. rigorously ready diagrams enable quick appreciation of the fundamental rules and evidence in tribology. The numerical anaysis of hydrodynamic lubrication is supported via a few desktop programmes that are integrated within the ebook. The keep an eye on of wear and tear is given broad remedy with an intensive dialogue of lubricant ingredients, strong lubricants and floor coatings. The effectiveness of coatings in suppressing particular different types of put on is analyzed including the tools of coatings deposition. The ebook includes 474 figures and forty four tables. extra then a thousand refrences are supplied to provide the reader entry to extra really expert details if required. the quantity is meant to supply graduates in engineering or fabrics technology with an knowing of the elemental thoughts of friction, put on and lubrication.
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Sample text
The oil viscosity at a specific temperature can be either calculated from the viscosity-temperature equation or obtained from the viscosity-temperature ASTM chart. 3 Viscosity-Temperature Equations There are several viscosity-temperature equations available, some of them are purely empirical whereas others are derived from theoretical models. 1 [331. Among them the most accurate is the Vogel equation. Three viscosity measurements at different temperatures for a specific oil are needed in order to determine the three constants in this equation.
It is estimated that one third of the world’s energy resources in present use is needed to overcome friction in one form or another. Lubrication is an effective means of controlling wear and reducing friction. Tribology is a field of science which applies an operational analysis to problems of great economic significance such as reliability, maintenance and wear of technical equipment ranging from household appliances to spacecraft. The question is why ‘the interacting surfaces in relative motion‘, (which essentially means rolling, sliding, normal approach or separation of surfaces), are so important to our economy and why they affect our standard of living.
12 Schematic diagram of a short tube viscometer. Rotational Viscometers Rotational viscometers are based on the principle that the fluid whose viscosity is being measured is sheared between two surfaces (ASTM D2983). In these viscometers one of the surfaces is stationary and the other is rotated by an external drive and the fluid fills the space in between. The measurements are conducted by applying either a constant torque and measuring the changes in the speed of rotation or applying a constant speed and measuring the changes in the torque.
