By MJ Neale and M Gee (Auth.)
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Additional info for A Guide to Wear Problems and Testing for Industry
4(d) and (e) are commonly used for component material wear tests. The arrangement shown in Fig. 4(d) tends to give more consistent results than that shown in Fig. 4(e) because in the latter arrangement the contact area between the components varies substantially during a test. This is because, in practice, there has to be some diametral clearance between the specimens to allow for assembly, so that the rubbing contact changes from an initial nominal line contact to an area contact as the components bed in to each other.
6 Particle erosion This is a type of wear which occurs when surfaces are impacted by a continuous stream of hard particles. An example of its intended use is in the sand blasting of surfaces to clean them up by removing surface deposits. It does, however, cause undesirable wear to the inside of pipelines carrying abrasive materials in a fluid medium. Similar problems arise in the flow of crude oil containing sand, where critical control valves can become heavily worn by particle erosion. The selection of materials to resist particle erosion is critically dependent on the angle of impact of the particles.
The tests shown in Fig. 8(a) and (b) are an approach to simplified test arrangements and have been used for the accelerated testing of rolling bearing materials for their fatigue strength properties. These tests tend to be used by the manufacturers of rolling bearings and plain beatings, and some user industries. They are not in general use in testing laboratories.
A Guide to Wear Problems and Testing for Industry by MJ Neale and M Gee (Auth.)