METHOD FOR DETERMINING SUITABILITY OF HIGH-PRESSURE METAL COMPOUND TANKS Russian patent published in 2018 - IPC G01N29/14 

FIELD: technological processes.

SUBSTANCE: use: for non-destructive testing of high-pressure metal-composite tanks using acoustic-emission signals. Essence of the invention is the fact that in the process of loading the tanks by gradually increasing their internal pressure parameters of acoustic emission signals are measured and used to determine the level of accumulated damage, and when the critical parameters have been reached, a decision is taken on the suitability of the tank for operation, while the calibration of the reference tank is performed to a level of no more than 1.25 of the preset working pressure with continuous monitoring of acoustic emission wave fluxes in the composite material and corresponding internal pressures in the tank, narrow band and broadband acoustical emission signals, corresponding to the processes of destruction of the matrix and fibers of the composite material, are isolated, by calculating the mean square deviation of the amplitudes of narrowband and broadband acoustic emission signals, determining the criterial parameters, corresponding to the quantiles of the empirical distribution functions of the mean square deviations of the amplitudes of narrowband and broadband acoustic emission signals, whose level is chosen not less than the level of the standard deviation of the noise flux of acoustic emission signals and not higher than the median value of the distribution, the choice of the level of the discrimination threshold based on the criterial parameters so that the discrimination threshold would correspond to at least 75 % of the difference in the criterial parameters of broadband and narrowband acoustic emission signals, obtained at the stage of calibration tests, loading of each subsequent tank is performed until the criterion parameter reaches the discrimination threshold, and the decision on the level of tank qualification is made on the basis of comparison of internal pressures in a batch of tanks corresponding to the thresholds of discrimination.

EFFECT: technical result: increasing the reliability of the determination of suitable high-pressure metal-composite tanks.

3 cl, 8 dwg