Photoacoustics of the Stressed State in Solids
ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
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The modern experimental and theoretical states of the problem of residual stress detection by the photoacoustic method are analyzed. Some experimental results obtained by the photoacoustic method for Vickers indentation zones in silicon nitride and Al2O3-SiC-TiC ceramics arc presented. The effect of annealing on the photoacoustic piezoelectric signal for the Al2O3-SiC-TiC ceramic and the influence of the given external loading on the behavior of the photoacoustic signal near the radial crack tips are investigated. It is experimentally shown that both compressive and shear stresses contribute to the photoacoustic signal near the radial crack tips. The theoretical approach based on the nonlinear thermoelastic model of the photoacoustic effect is further developed for explanation of the photoacoustic signal behavior near the radial crack tips. It is demonstrated that this model of the photoacoustic effect agrees qualitatively with the available experimental data.
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