ANALYSIS OF SIGNALS OF ACOUSTIC EMISSION OF TRIBOSYSTEM IN CONDITIONS OF STEPPED LOAD INCREASE
DOI:
https://doi.org/10.18372/0370-2197.1(102).18435Keywords:
electric spark coating, acoustic emission, wear intensity, stress-strain stateAbstract
An evaluation of the performance of electric spark coating in conditions of stepped load increase was carried out based on the analysis of acoustic emission (AE) signals. The purpose of the research was to determine the changes in the frictional contact during the transition of the tribosystem from the normal to the catastrophic stage of wear. The research was carried out for tribosystem steel 30ХГСА - unmodified or modified Д16 duralumin alloy. Modification was carried out by applying a combined discrete coating of hard alloy ВК8 and copper with a density of 55-65% by the method of electrospark alloying. Modification of Д16 duralumin provides efficient operation of friction pairs up to 1200 N, the average power of AE signals and their dispersion values are reduced by 2...4 times. An 80% reduction in wear intensity of tribosystems with combined electric spark coating was established, the depth of propagation of plastic deformations is reduced by 2 times. Empirical dependences of wear intensity on loading parameters and AE signals were obtained.
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