Spatial dependence of a laser-induced shock wave mitigator matrix: a numerical study

Ricardo Gonzalez-Romero; Marija Strojnik; Guillermo Garcia-Torales

doi:10.1117/12.2567273

20 August 2020 Spatial dependence of a laser-induced shock wave mitigator matrix: a numerical study

Ricardo Gonzalez-Romero, Marija Strojnik, Guillermo Garcia-Torales

Proceedings Volume 11502, Infrared Remote Sensing and Instrumentation XXVIII; 115020J (2020) https://doi.org/10.1117/12.2567273
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

A laser shock wave (LSW) is a pressure wave in the range of gigapascals, duration in the order of nanoseconds, propagates at rates higher than Mach 1, and is induced by high power laser pulses. As an LSW propagates inside a solid, some physical material characteristics in the area of incidence are improved due to a residual compression stress field. However, since the LSW pressure reaches some tens of GPa, tensile stress damages the solid due to a spallation process if the material is fewer than 1 mm thick. A shock wave mitigation structure coupled to a solid reduces the LSW pressure due structure walls reflections, avoiding the spallation. In this work, a FEM simulation of LSW propagation in a 1 mm thick aluminum slab with a matrix of mitigating structures attached to the back is performed. The relationship among the induction area of the LSW, and the relative location of each mitigation structure in the matrix, has a direct influence on the pressure field distribution.

Conference Presentation

Citation Download Citation

Ricardo Gonzalez-Romero, Marija Strojnik, and Guillermo Garcia-Torales "Spatial dependence of a laser-induced shock wave mitigator matrix: a numerical study", Proc. SPIE 11502, Infrared Remote Sensing and Instrumentation XXVIII, 115020J (20 August 2020); https://doi.org/10.1117/12.2567273

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