Local thermoelastic stresses appear in the surface layers of materials under pulsed laser irradiation. Changes in the amplitude and shape of acoustic signals with laser pulse intensity were studied. Changes corresponding to a transition from purely elastic to elastoplastic deformation in the zone of interaction between the radiation and surface have been registered. Measurement of the absorbed energy radiation which causes these threshold phenomena makes it possible to estimate the yield limit for plastic materials and strength limit for brittle ones.
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Konovalov, I.A., Sklyarenko, S.K. Photoacoustic Method for Obtaining Strength Characteristics of Thin Films. MRS Online Proceedings Library 356, 621–625 (1994). https://doi.org/10.1557/PROC-356-621