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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Additional info for Acoustic Emission in Friction
2. When the surfaces slide mutually their asperities are subjected to stochastic pulse loading due to the accidental formation and rupture of microcontacts. 3. The asperities fail due to fatigue. Given this, flake-like particles are formed whose characteristic sizes are in proportion to the contact spot size. The first two assumptions are traditional and widely used in both theoretical analysis and the interpretation of experimental data. The following should be noted with reference to the third assumption.
The basic drawback is that it is difficult to find regularities if the number of initial parameters of a problem to be solved is great. Besides, the problem of reconstruction of the pressure distribution belongs to ill-defined problems because data on microasperity dimensions, the approach of the surfaces in contact and other characteristics that are rough are used in calculations. To solve such a problem special algorithms should be applied which are not involved, as a rule. For this reason, from our viewpoint the data obtained in such a way should be carefully relied on.
Most researchers dealing with practical applications of AE phenomenon recognise as necessary the analysis of the amplitude distribution. It is naturally since a certain distribution of the pulse amplitude corresponds to each deformation mechanism or physical process inducing AE. Publications contain data on different types of the experimentally obtained amplitude distribution, namely exponential, Rayleigh, -distribution, power-series, etc. As our studies have shown (see Chapter 4) the amplitude distribution of AE at friction may vary from J -type to unimodal.