21 October 2016 Laser irradiation effects on thin aluminum plates subjected to surface flow
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Abstract
The irradiation effects of LD laser on thin aluminum alloy plates are studied in experiments characterized by relatively large laser spot and the presence of 0.3Ma surface airflow. A high speed profilometer is used to record the profile change along a vertical line in the rear surface of the target, and the history of the displacement along the direction of thickness of the central point at the rear surface is obtained. The results are compared with those without airflow and those by C. D. Boley. We think that it is the temperature rise difference along the direction of thickness instead of the pressure difference caused by the airflow that makes the thin target bulge into the incoming beam, no matter whether the airflow is blown or not, and that only when the thin aluminum target is heated thus softened enough by the laser irradiation, can the aerodynamic force by the surface airflow cause non-ignorable localized plastic deformation and result a burn-through without melting in the target. However, though the target isn’t softened enough in terms of the pressure difference, it might have experienced notable deformation as it is heated from room temperature to several hundred degree centigrade.
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Houman Jiang, Houman Jiang, Guomin Zhao, Guomin Zhao, Minsun Chen, Minsun Chen, Xin Peng, Xin Peng, "Laser irradiation effects on thin aluminum plates subjected to surface flow", Proc. SPIE 9990, High-Power Lasers 2016: Technology and Systems, 99900J (21 October 2016); doi: 10.1117/12.2241655; https://doi.org/10.1117/12.2241655
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