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ABSTRACT
Ultrafast thermoelasticity based on hyperbolic two-step heat conduction model with electron-phonon interaction was applied to investigate the thermomechanical coupling responses of an immense homogeneous, isotropic gold film, which was irradiated by various ultrashort laser pulse trains. The solution to the problem was obtained by solving finite element governing equations. For the same energy injection, a new micromachining technique using laser pulse trains can offer certain advantages compared with a single laser pulse micromachining, such that the laser pulse train is provided with the advantages of long and short laser pulses. The effects of the pulse number and the pulse separation times for a laser pulse train on ultrafast thermomechanical coupling responses, i.e., the temperature, displacement as well as stress, are presented graphically and analyzed. It was found from the numerical results that the expected machining results (or thermomechanical responses) may be obtained by using pulse train technology with optimal pulse number and pulse separation time.