Application of Principal Components Analysis to the Investigation of Acoustic Emission in Plastic Deformation of Lead Alloys
Abstract
A study was made of the dependence of acoustic emission, formed during static deformation of lead alloys, on the stages of strain hardening. An essential change in the informative characteristics of acoustic emission signals during the change in the stages of strain hardening, reflecting the evolution of the physical mechanisms of deformation during loading ofthe material, is established. Quantitative analysis of the effect of stages on acoustic emission signals was carried out using the principal component method. When processing the experimental data, the entire signal recorded during the loading process was divided into small blocks, each of which reflected the behavior of the material in the corresponding portion of the loading curve. Acoustic emission for an individual unit was described using informative signal parameters that reflected its energy and frequency characteristics. The processing of the experimental data made it possible to cluster the signals in accordance with the isolated stages of strain hardening.
The obtained results can be used in the acoustical-emission study of the stagedness of the processes of plastic deformation in materials and for the diagnosis of their deformation behavior.
DOI 10.14258/izvasu(2018)4-04
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