切向空气流速度对玻璃纤维增强树脂基复合材料激光烧蚀热的影响  

Influence of Tangential Airflows Velocity on Ablation Heat of Laser Irradiated Glass Fiber Reinforced Resin Composites

作　　者：张检民[1] 马志亮[1] 冯国斌[1] 贺敏波[1] 刘卫平[1] 韦成华[1] 

机构地区：[1]西北核技术研究所激光与物质相互作用国家重点实验室,陕西西安710024

出　　处：《中国激光》2015年第3期212-218,共7页Chinese Journal of Lasers

基　　金：激光与物质相互作用国家重点实验室专项预研基金(12111301)

摘　　要：烧蚀热可用于材料抗激光加固性能表征和材料的激光加工效率描述。实验研究了亚音速表面切向空气气流速度和激光功率密度对玻璃纤维/树脂复合材料烧蚀热的影响规律,结果表明,相同气流速度下,烧蚀热在100~500 W/cm2激光功率密度范围内先迅速降低然后趋于稳定,转折点约位于200 W/cm2;相同激光作用下,功率密度较低时,烧蚀热随着气流速度提升而变大,功率密度高于一定值（约200 W/cm2）后,烧蚀热随气流速度提升而降低。分析认为材料内部扩散、热解气体燃烧、残碳氧化放热、辐射能量损失、气流剥蚀等多个因素的竞争是激光能量利用效率变化的原因。Ablation heat can be not only used to represent the capability in laser-hardening of composite, but also to describe the laser processing efficiency. Experiments are conducted to analyze the influence law of tangential airflows velocity at low subsonic and laser intensity on laser ablation heat of glass fiber reinforced epoxy resin composites. It shows that laser ablation heat decreases rapidly with the incident laser intensity firstly and then become stable at the same airflow velocity, when the laser irradiance is in the range of 100~500 W/cm2. The pivotal point of the ablation heat is about 200 W/cm2. On the condition that the laser intensity is below about 200 W/cm2,laser ablation increases with the airflow velocity with the same laser irradiation. On the contrary, laser ablation decreases with the airflow velocity. Ablation mechanism analysis indicates that the variation of utilizing efficiency of incident laser energy is attribute to the competition of multiple factors which include thermal diffusivity in material, surface combustion of pyrolysis gas, oxidative ablation of pyrolytic charcoal, radiation induced energy loss, and airflow denudation effect.

关 键 词：激光光学 激光辐照效应 烧蚀热 玻璃纤维复合材料 切向气流速度 激光功率密度 

分 类 号：TN249[电子电信—物理电子学]