Download Mechanical Wear Fundamentals and Testing, Revised and by Raymond G. Bayer PDF

By Raymond G. Bayer

Updating his 1994 unique variation, Bayer (a Fellow of the yankee Society for checking out and fabrics) accommodates new tribological learn into this new paintings explaining thermal and oxidative put on mechanisms, habit, and phenomena; discussing put on checking out technique; and detailing 20 phenomenological and eleven operational put on exams. New appendixes contain tables on threshold tension for galling and sliding put on relationships for various touch events. additionally incorporated is a word list of damage mechanisms, comparable phrases, and phenomena.

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Extra info for Mechanical Wear Fundamentals and Testing, Revised and Expanded

Example text

In the second stage, damage features perpendicular to the sliding direction appeared. Again, there was no loss of material. This feature, termed crosshatching, implied something other than a single-cycle deformation mode was occurring. As sliding continues in this stage, the crosshatching became more pronounced until ultimately spalling and flaking occurred. This is the start of the third and final stage. In this stage, material loss occurs and, with continued sliding, a wear groove of increasing depth is formed.

The probability of adhesion is low. One factor that can affect K is the relative strength of the junction interfaces to the strength of the asperities that make up the junctions. The weaker the adhesion at the interfaces is, the less likely adhesive wear will occur. Consequently, choosing conditions, which inhibit adhesion over those, that promote adhesion reduce K and adhesive wear. Interface adhesion can be affected by the similarity of the two materials in contact. The more similar they are, the stronger the adhesion.

13 shows how K varies with load for unlubricated sliding between gold specimens. There are two stable regions for K, one below 5 g and the other above 30 g. These two transition points are close to the minimum loads for transfer and loose fragments to occur, respectively. Values of 1 and 25 g are estimated for these, using the simple models described (54). The data suggest that adhesive wear can only be characterized by a stable K value after the mean junction load exceeds the junction load required for the formation of a loose particle.

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