A Guide to Wear Problems and Testing for Industry by MJ Neale and M Gee (Auth.) PDF

By MJ Neale and M Gee (Auth.)

ISBN-10: 0815514719

ISBN-13: 9780815514718

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Extra info for A Guide to Wear Problems and Testing for Industry

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2. A critical feature of abrasive wear tests using hard, granular materials is that, if the material is used for more than one contact with the test specimen, it can become modified and give unrepresentative results. If a loose, sharp abrasive is being used it may become partially blunted or may be broken up into smaller sized particles. The overall effect of this will be to give a reduced wear rate on the specimen compared with that which would have occurred if new, sharp, abrasive material had been continuously fed to the specimen.

The problem can be eased by regular lubrication and there should also be potential for surface treating or plating the wires before they are formed into the rope. 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.

This is a controlled feature, as distinct from the built-in flexibility and poor specimen location resulting from inadequate test machine design. Wear Tests to Simulate Practical Conditions 55 ,~F a. Pin on a rotating disc ~F b. _ _ M L.. c. i~,~' ~rF d. Ring divided into three pads on a rotating ring ,F e. Bush on a rotating shaft N N~~ Piston ring and cylinder segments with reciprocating motion N indicates movement F indicates externally applied force Fig. 4 Fretting The test arrangements that have been used for testing materials and surface treatments for their resistance to fretting are shown in Fig.

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A Guide to Wear Problems and Testing for Industry by MJ Neale and M Gee (Auth.)

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