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
DISTRIBUTION OF PRESSURE OVER MICROCONTACT SPOTS A great variety of interrelated sources of acoustic emission of different physical nature acting in solid friction complicates the development of the general theory of AE in friction. Besides, since the physical nature of friction has not been studied completely so far, no common concepts are available on the relation between characteristics of acoustic emission and processes occurring in friction units. At the same time, such concepts based on clear physical principles are necessary to clarify experimentally obtained regularities of AE in friction from united viewpoints.
Energy of Acoustic Emission. Direct measurements of the energy of an acoustic signal are quite difficult. Many researchers propose to measure the energy of the electric signal of the gage. Thus, the authors of  proposed to assess AE energy by the parameter AN˙ where A is the signal amplitude. 1). Moreover, the mentioned characteristic presents energy variation per unit time, that is, it is related to the signal power. e. E = K T A2 N˙ where K is a proportionality coefficient; T is the duration of measurement.
In ductile failure and brittle fracture the probability densities of AE pulse amplitudes are greatly different. Brittle fracture is characterised by an almost 28 CHAPTER 1 symmetrical distribution with a mode at high amplitudes. A distinctly asymmetrical distribution with a great number of pulses of a high amplitude is typical for ductile failure. 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.
Acoustic Emission in Friction 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