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A Fem study on th einfluence of the geometric characteristics of metallic films irradiated by nanosecond laser pulses

Stavroulakis Georgios, E. Kaselouris, Skarvelakis Emmanouil, Nikolos Ioannis, Y. Orphanos, E. Bakarezos, N.A. Papadogiannis, M. Tatarakis, V. Dimitriou

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Περίληψη

The dynamic mechanical behavior of metallic film-substrate systems excited by a nanosecond laser pulse is studied in the thermoelastic, non-destructive, regime. In this regime, the deformation of the metallic film occurs after laser excitation without altering its elastic properties. The absorption of the laser pulse results in an increased localized temperature, which in turn causes thermal expansion and generates acoustic waves that propagate the solid target. Matter’s dynamic response is numerically described by a coupled thermal-structural, transient, three-dimensional (3D) Finite Element (FE) model. The 3D-FE model has been validated by the help of experimental results obtained by the help of laser interferometric methods. The influence of the geometric characteristics of the metal films to the generation and propagation of the acoustic waves and to their mechanical properties are studied in this paper. The influence of the thickness of the metal film in relation to the displacement and the temperature distributions is investigated. Moreover, an initial approach to the understanding of the mechanical behavior of matter in the case of presence of geometrical defects like gaps, holes or bubbles is also attempted. Mechanical features like displacements, velocities, temperatures, stresses and strains are analyzed in the transient time and space solution domains.

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