METHOD FOR MONITORING DEGRADATION OF MATERIAL STRUCTURE AND DETERMINING RESIDUAL STRENGTH OF ARTICLE Russian patent published in 2018 - IPC G01N29/14 

FIELD: measurement technology.

SUBSTANCE: use to monitor the degree of degradation of a material structure and to determine an article residual strength. Core of the invention is performing acoustic-emission (AE) monitoring using location groups of active emission converters, preamplifiers and a system of collection-processing of registered arrays of active emission pulses, herewith in real time pulses of active emission are graded as per the relative energy level and the average emission frequency, the lower, the middle and the upper clusters are formed within the field of the specified parameters, and the percentage of pulses in each cluster is calculated reflecting micro-, meso-, and macrostructural fractures of the material, wherein as informative and stable acoustic emission parameters for the cluster separation of signals the relative pulse energy is used measured in decibels and corresponding to the number of emissions in units, as per which when compared with the results of testing the material for destruction the degree of degradation and the residual strength of the article in the zone of acoustic emission monitoring is determined, herewith the boundaries of the formed clusters are established as per the results of the preliminary testing the material of the article basing on the nature of the pulses radiation sources and the used signals discrimination threshold level.

EFFECT: ensuring the possibility in the process of acoustic-emission diagnostics of the article to monitor the degree of degradation of the material structure and to determine the residual strength of the article in the AE monitoring zone without involving other methods of technical diagnostics and non-destructive testing.

1 cl