Abstract
The effect of mechanical stress influence on the thermoelastic photoacoustic signals inside Vickers indents in steel and nanonickel has been experimentally demonstrated. It has been shown that photoacoustic signal changes due to external stresses can be reversible or irreversible, depending on the indent orientation and the stress applied to the sample. Reversible changes in the photoacoustic signal can reach significant values at the level of tens percent of the average signal amplitude from the sample. Relative changes in the photoacoustic signal amplitudes have been theoretically evaluated for Vickers-indented and non-indented areas, taking into account the dependence of the elastic modulus of metals on temperature. It has been shown that this theoretical consideration provides qualitative explanation of differences in the behavior of photoacoustic signals under stress in indented and non-indented areas in metals.
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