Abstract
A model for the description of the strong thermal-wave nonlinearity exhibited by a non-stationary (“breathing”) crack (delamination) in a solid is proposed. The description of the nonlinear thermal-wave frequency spectrum both in the regime of the laser-induced thermal tansparency and of the laser-induced thermal darkening of the crack is presented. The conditions under which the amplitude of the thermal-wave second harmonic becomes on the order of the fundamental thermal-wave amplitude are derived. It is further demonstrated that the dependence of the photothermal response on the pump-laser intensity provides mechanical information on the crack (delamination). This type of information is different from, and additional to, that provided by the traditional measurements of the photothermal-response dependence on laser-beam intensity modulation frequency.
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