METHOD FOR DETERMINING THE BEGINNING OF PLASTIC DEFORMATION OF A SUBSTRATE MATERIAL WHEN AN INDENTER IS PRESSED INTO A PROTECTIVE COATING LAYER Russian patent published in 2023 - IPC G01N3/40 G01N29/14 

FIELD: measuring technology.

SUBSTANCE: they monitor the increase in the activity of acoustic emission that occurs during the introduction of the indenter into the protective coating. To determine the beginning of the transition of the substrate material from elastic to elastic-plastic deformation, the moment of time is controlled at which the weight content of pulses within the boundaries of the cluster with the following parameter values: quantile of the amplitude distribution of signals ( ) in the range u_i =35÷45 dB and the average frequency of emissions N_i/t_i, where N_i - the number of emissions, t_i - signal duration in the range corresponding to the quantile of their distribution spectrum p_Ni/ti =0.7÷0.85 will deviate from the zero level.

EFFECT: increased reliability and accuracy of indentation parameters.

1 cl, 4 dwg