Open AccessВлияние механических напряжений на поведение лазерных ультразвуковых сигналов вблизи отверстия в керамике нитрида кремния
Author(s) -
А.Л. Глазов,
К.Л. Муратиков
Publication year - 2021
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2021.12.51067.18740
Subject(s) - thermoelastic damping , materials science , dielectric , ceramic , silicon nitride , excitation , thermal , laser , lattice (music) , condensed matter physics , nitride , ultrasonic sensor , silicon , optics , composite material , thermodynamics , physics , acoustics , optoelectronics , quantum mechanics , layer (electronics)
An experimental study of the behavior of laser ultrasonic signals near a hole in a plate from dielectric silicon nitride ceramics under the action of external compressive stresses is carried out. A fundamental discrepancy between the results obtained and similar results obtained by us earlier for metals and a quantitative discrepancy with the predicted thermodynamic model of the formation of thermoelastic signals from stressed materials is shown. An explanation of the observed discrepancies is proposed using the model of thermal excitation of lattice defect states that we proposed earlier.