By Victor M. Baranov,Evgeny M. Kudryavtsev,Gennady .A. Sarychev, et al.Elsevier|Elsevier Science||Elsevier ScienceAdult NonfictionScience, Technology, EngineeringLanguage(s): EnglishOn sale date: 08.04.2011Street date: 29.07.2011Preview

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E. friction surface damage. 3. Sources of AE Signals at Friction of Solids Sources of AE Elastic interaction, impacts Changes in stress-strain state of a local volume of solid surface layer Plastic deformation, damage Generation, motion and interaction of dislocations Energy liberation at repeated deformation or phase hardening-weakening and damage of surface layer Changes in friction surface structure Formation of microcracks, micropores and new surfaces because of wear Appearance of wear debris Surface spalling and formation of fatigue pit Characteristics of AE are sensitive to the wear mode.

This is confirmed by the analysis of publications dealing with acoustic emission at friction. The main distinctive feature of acoustic emission at friction is the presence of additional sources in comparison with the deformation and failure. These sources result from fast-running processes occurring at friction. Among them are the elastic interaction of friction surface asperities (for example, collisions of asperities), chemical processes including corrosion which accompany friction in many cases, and the formation and rupture of adhesion junctions.

5 depending on the value of the above grouping that is in good agreement with experimentally obtained data. 18 V). 4. SOURCES OF ACOUSTIC EMISSION IN FRICTION OF SOLIDS Various mechanical and physical-chemical processes occur on real contact spots in the friction of solids. Some of them are similar to processes occurring at deformation and damage of materials, other processes are specific for friction. 3). This is confirmed by the analysis of publications dealing with acoustic emission at friction.

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