Extraction Processing

A Guide to Wear Problems and Testing for Industry - download pdf or read online

By Michael Neale, Mark Gee

ISBN-10: 0815514719

ISBN-13: 9780815514718

ISBN-10: 0815515987

ISBN-13: 9780815515982

ISBN-10: 1860582877

ISBN-13: 9781860582875

Desktop part put on is likely one of the most expensive difficulties inside of undefined. actually, a 1997 survey within the united kingdom put put on bills at 25% of turnover, or nearly $1 billion. in lots of situations, making layout and or fabric alterations can decrease this price by way of 50% or extra! This guide experiences part put on, and publications the reader via ideas to put on difficulties, trying out tools for fabrics and put on mechanisms, and knowledge on put on functionality of alternative fabrics for parts. the secret is that it is helping to lessen ""the backside line"" elimination dangers linked to adjustments to equipment. This publication relies on functional use. It outlines the subsequent practices: experiences of damage mechanisms that take place in numerous kinds of equipment and strategies to commercial put on difficulties; courses to relative put on functionality of alternative part fabrics; comparability of the damage functionality of these fabrics; studies of laboratory exams to simulate put on, and choice of applicable checks; id of superior fabrics, and; exam of worn surfaces.

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Additional resources for A Guide to Wear Problems and Testing for Industry

Sample text

It is, however, critically important to select a test configuration that is reasonably representative of the practical situation by checking the specimen arrangement and the test conditions to ensure that they represent those in the real machine or machines. The most important objective in a test is to reproduce the dominant wear mechanism with the surface appearance of the worn test specimens being identical to that of the worn surface of the actual components. The following factors are particularly important: 0 There will always be two components involved in any wear test, which may be two parts of a machine in mutual contact, or one may be the machine component, with the other being some material with which it makes contact.

2(c). An alternative simple test is to use the abrasive bonded to a backing material, similar to abrasive papers, but the problem then is that the abrasive becomes blocked with wear debris as well as the previously described risk of blunting. This situation invalidates tests such as that shown in Fig. 2(a). The test shown in Fig. 2(b), which uses a spiral track, overcomes this problem but the length of available wear track then provides a limit to the applicability of this test. 44 Wear Problems and Testing for Industry ~F a.

5 Cavitation erosion Cavitation erosion is a type of wear which occurs on the surfaces of components operating in a disturbed liquid stream. In this situation the flow can create transient zones of very low pressure in which the liquid vaporizes and forms low-pressure bubbles. When these bubbles pass on to regions of higher pressure they tend to collapse implosively, and the liquid then impacts the component surface and subjects it to very high local stress. The resistance of materials to this type of damage tends to be related to their ultimate resilience, which is the work required to fracture them, or the area under their stress-strain curve up to the fracture point.

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A Guide to Wear Problems and Testing for Industry by Michael Neale, Mark Gee

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