INFLUENCE OF THE SIZE AND SHAPE OF THE TECHNOLOGICAL NOTCHES ON THE ACCURACY OF ACOUSTIC EMISSION SOURCES LOCATION
The experiments for the research effect of the size and shape of the technological notches in steel plates on time difference of arrival an impulse on the acoustic emission transducers were accomplished. The obtained data has been compared with numerical simulation results of elastic wave propagation in plates with various strip and circular notches. The researches shew that a form of the notches influence on time difference of arrival an impulse on the acoustic emission transducers to a much lesser extent than a size and the sensor location in relation to a shading zone - edge of the notch. Based on the results of researches a location of the source of acoustic emission, which it was near an edge of the notch in a 40 mm thick steel plate with a 100 mm central opening, was carried out. This study has shown that in this case location group should involve no less than four transducers to reduce measurement error below 10% relative of the basic array antennas size. The numerical simulation of acoustic emission impulse propagation in plates with strip and circular notches allowed to reduce the experiment research volume while increasing them informativeness.