The paper presents numerical modeling of interaction of strong laser radiation with conventional aluminum sheets, similar to those used in military technology. The theoretical model uses equations of continuum mechanics (equations of hydrodynamics and the equations of mechanics of solid bodies in a cylindrical coordinates r, z), enriched with equations describing the typical effects of high temperature, such as absorption of laser radiation within the Al shield, electronic and radiative thermal conductivity, and energy loss on phase transitions (melting, evaporation, ionization). Semiempirical equations of state were used to describe the properties of material in the conditions of large deformation and the Johnson-Cook’s model. The equations were solved using the method of free points developed by one of the authors. Two kinds od laser pulses were considered: microsecond pulse with duration of 200 μs and a low peak power of 10 kW/cm2 (CW laser), and nanosecond pulse with duration of 10 ns and high peak power of 5 GW/cm2 (pulsed laser). The aim of this study was to determine the shapes and temperatures of Al plates under the influence of these pulses for the comparison of the numerical results with future experiments and to verify the possibility to determine the distribution of the energy density of the laser beam on the basis of the plate deformation.
K. Jach, R. Świerczyński, R. Ostrowski, A. Rycyk, K. Czyż, M. Strzelec, and A. Sarzyński, "Analysis of deformation of aluminum plates under the influence of nano- and microsecond laser pulses," Proc. SPIE 10440, Optical Materials and Biomaterials in Security and Defence Systems Technology XIV, 1044004 (Presented at SPIE Security + Defence: September 12, 2017; Published: 26 October 2017); https://doi.org/10.1117/12.2278420.
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