Considered the pyrolysis and the internal gas convection, a three-dimensional mathematical model based on the conservation of energy, had been developed for predicting the pyrolysis behavior of composite subjected to laser. By taking carbon-fiber /epoxy composite for examples, the effects of irradiation time and power density on the mass loss and the thermal ablation rate were obtained from an irradiation experiment with the tangential nitrogen and low power density. The numerical results agree well with the experimental results on the whole. The results reveal that as the irradiation time continues, the thermal ablation rate begins to decrease gradually and then tends to be steady after a rapid increase. The oxidation can be effectively restrained due to a nitrogen protection. However, laser power density will enhance the oxidation effect, which causes that the mass loss approximately shows a linear rise and the thermal ablation rate tends to be steady after 180 W/cm^2.

Date Published: 12 May 2017
PDF: 6 pages
Proc. SPIE 10173, Fourth International Symposium on Laser Interaction with Matter, 101730J (12 May 2017); doi: 10.1117/12.2266767

Published in SPIE Proceedings Vol. 10173:
Fourth International Symposium on Laser Interaction with Matter
Yongkun Ding; Guobin Feng; Dieter H. H. Hoffmann; Jianlin Cao; Yongfeng Lu, Editor(s)