两种纤维增强复合材料连续激光烧蚀阈值测量及吸收特性分析
Ablation threshold measurement and absorption characteristic analysis of two fiber reinforced composites irradiated by CW laser
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摘要: 通过双积分球-光电管测试系统和摄像记录的方法，对芳纶纤维/环氧和碳纤维/环氧两种复合材料在1.319μm连续激光作用下的烧蚀阈值和烧蚀过程中材料对激光能量的吸收特性进行了实验研究。结果表明：芳纶纤维/环氧复合材料的平均烧蚀阈值随材料厚度增加而降低，碳纤维/环氧复合材料的平均烧蚀阈值不受材料厚度影响，约为70 W/cm2；两种纤维增强复合材料烧蚀前的反射率随激光功率增加而缓慢增大，芳纶纤维/环氧材料从0.40变化到0.45，碳纤维/环氧材料从0.15变化到0.20；当发生烧蚀时，芳纶纤维/环氧材料的反射率急剧下降，吸收率增大，碳纤维/环氧材料的反射率无明显变化，吸收率约为0.80。Abstract: The ablation threshold measurement and absorption characteristic analysis in the ablation courses of polyaryl amide-fibers/epoxy and carbon-fibers/epoxy composites irradiated by 1.319 μm continuous wave laser beam were studied by the double integrating spheres-photodiode system and the camera recording method. The results show that the average ablation threshold of polyaryl amide-fibers/epoxy composite decreases with the material thickness increasing, but the thickness does’t effect the average ablation threshold of carbon-fibers/epoxy composite, which is about 70 W/cm2. The reflectivities of two composites increase slowly with the laser power intensity increasing before ablation, and change from 0.40 to 0.45 for polyaryl amide-fibers/epoxy composite and from 0.15 to 0.20 for carbon-fibe
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Key words:
- laser irradiating /
- composite /
- ablation threshold /
- absorption characteristics
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