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Proceedings Paper

Experimental and numerical investigations of laser-induced thermal effects on composite materials
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Paper Abstract

Laser experiments under combined mechanical tensile stress have been carried out to evaluate the operational vulnerability of fiberglass composite structures to a laser irradiation. It follows that the optical propagation of the laser beam inside the semi-transparent reinforced laminate is one of the key issues of this study as it rules every phenomenon occurring at a later stage. The Radiative Transfer Equation (RTE) has been used together with spectrometric measurements to assess the initial coupling of the monochromatic laser beam with the optically diffusing material. However, the partial absorption of the high-energy laser beam quickly leads to very-high temperatures on the irradiated area that can induce several phase transitions of the polymer. These changeovers and their influence on the optical and thermal properties of the system have been investigated with conventional methods (TGA and DSC) and reproduced with a time- and temperature-dependent kinetic scheme based on the Arrhenius equation. Finally, a 1D multiphysics model has been developed to reproduce the temperature evolution recorded during laser trials. Based on a time-explicit scheme, this computational approach shows a fairly good agreement and allows for a further understanding of the multiple phenomena occurring under a laser irradiation.

Paper Details

Date Published: 7 October 2019
PDF: 13 pages
Proc. SPIE 11162, High Power Lasers: Technology and Systems, Platforms, Effects III, 111620P (7 October 2019); doi: 10.1117/12.2532258
Show Author Affiliations
V. Allheily, Institut Franco-Allemand de Recherches de Saint-Louis (France)
L. Merlat, Institut Franco-Allemand de Recherches de Saint-Louis (France)
G. L'Hostis, Lab. de Physique et Mécanique Textiles (France)

Published in SPIE Proceedings Vol. 11162:
High Power Lasers: Technology and Systems, Platforms, Effects III
Harro Ackermann; Willy L. Bohn; David H. Titterton, Editor(s)

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