激光辐照下二维编织碳纤维/环氧树脂复合材料的烧蚀特征

Ablation characteristics of 2D braided carbon fiber/epoxy composites under laser irradiation

开展了光纤激光对二维编织碳纤维/环氧复合材料的烧蚀试验研究,获得了不同入射热流条件下编织复合材料的烧蚀特征,分析了激光烧蚀机制。结合非接触测温和接触测温两种方法开展试验,采用高温红外热像仪测试了复合材料前表面的瞬态温度场演变过程,通过热电偶获得了复合材料后表面的温升数据。试验结果表明,当入射激光功率密度在102 W·cm-2量级时,二维编织碳纤维/环氧树脂复合材料的环氧树脂发生了明显的质量迁移,而碳纤维形貌变化不大;在强激光辐照过程中,二维编织碳纤维/环氧树脂复合材料的前后表面温差较大,前表面最高温度接近2 000℃,而后表面最高温度在200~500℃之间。

Ablation behaviors of 2Dbraided carbon fiber/epoxy composite irradiated by fiber laser were investigated.Ablation characteristics of braided composites under different thermal flux conditions were obtained and the laser ablation mechanism was analyzed.Combined with non-contact temperature measurement and contact temperature measurement,the transient temperature field evolution of the surface of the composite was measured by the high temperature infrared camera,while the temperature history of back surface was obtained by thermocouple.The experiment results show that when the level of incident laser power density is 102 W·cm-2,the epoxy resin of the2 Dbraided composites has obvious mass transfer,but the morphology of the carbon fiber is not changed.Meanwhile under high-energy laser irradiation,the temperature difference between the front and back surface of 2Dbraided carbon fiber/epoxy composites is very large.The maximum temperature of the front surface is close to 2 000℃,and the maximum temperature of the back surface is between 200-500℃.