ACOUSTIC EMISSION METHOD FOR DETERMINATION OF STRUCTURE DEFECTS FROM CARBON FIBER REINFORCED PLASTIC Russian patent published in 2019 - IPC G01N29/14 

FIELD: materials science.

SUBSTANCE: use: to determine structure defects of carbon fiber reinforced plastic. Summary of invention consists in the fact that first, the control zone of the sample from carbon fiber reinforced plastic is broken down into square cells, in each of which there is recorded acoustic emission signals from the simulator, their location, then for each cell, in which there is a signal location, the structural coefficients P_I and MARSE critical value, followed by performing stepped static loading of the sample with increasing load and when there is stable location of signals during loading in sample cells, the MARSE parameter is calculated and if its critical value is exceeded, the structural coefficient P_N for this cell, zone of stable location is covered by a location grid, the size of the cell is determined from the speed of propagation of the acoustic signal in the sample material, the defect is considered to be dangerous provided that if in the signal cell the MARSE parameter exceeds its critical value, then by comparing the structural coefficients obtained during operation of the simulator P_I and during loading P_N, determining type of defect in sample: value P_N ≤ P_I corresponds to destruction of matrix, delamination of composite sample, and P_R ≥ P_I – rupture of fibers of sample material.

EFFECT: technical result is improved reliability of monitoring structures from carbon fiber reinforced plastics in real time.

1 cl, 3 dwg, 2 tbl