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
Many researches made attempts to determine functional or correlation interdependencies between crack characteristics and AE signals registered. 2. 2. Correlation between AE Characteristics and Characteristics of Material Failure Failure characteristics Relations N = N0 KIm m ≈ 4 11 Stress intensity factor K1 1 − v N/ 0 2 Total crack opening displacement Total area of opened crack S S Ai i n Crack length increment l l Ai i 2 Crack area increment S S i Crack length L Critical of stress intensity factor Kc in corrosion cracking L Ai E/KI2 cl T dN/dt c Kc5 − K05 Note: N is the total AE count; A0 is the AE amplitude; is Poisson’s ratio; E is the Young’s modulus; is the yield stress; cl is the velocity of longitudinal waves; T is the duration of the first half-wave; dN/dt c is the critical AE count rate; K0 is the threshold value of the stress intensity factor; n is a numerical coefficient.
The amplitude of pulses contains information on the energy of AE source while the amplitude distribution provides data on the energy distribution of sources. If the amplitude distribution is known it is easy to find the mean amplitude, mean-square amplitude and amplitude variance. The first two values characterise integrally the energy of the process while the latter characterises the scatter of the energy of AE sources. 2), presents the dynamics of friction processes. As has been noted above, the use of predetection count distorts the pattern of the amplitude and amplitude-time distributions of AE pulses.
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.