The acoustic-emission properties of oxide tensosensitive indicators and signal recognition during the formation of cracks in a brittle coating layer

The acoustic-emission properties of brittle oxide tensosensitive indicators (TS) coatings are considered, which are used not only for determining the fields of the highest principal stresses (strains) in a substrate but also, when combined with the acoustic-emission (AE) method, for diagnosing flaws at an early deformation stage in structures. AE pulses that are generated in a brittle layer of a TS indicator during formation of cracks are analyzed as a function of the oxide-film thickness and the substrate-deformation rate. Proceeding from the features of AE pulses that arise during the formation of cracks in the brittle layer of a TS indicator, an algorithm for recognizing signals according to the shape of a decaying wave is proposed.