长脉冲激光辐照下环氧树脂的热烧蚀规律

 研究了树脂基复合材料中常用的E-51环氧树脂在ms级脉冲激光辐照下热烧蚀率及质量烧蚀率的变化规律，分析了脉冲激光的辐照时间、峰值功率密度、重复频率以及脉宽对烧蚀率的影响。研究结果表明：随辐照时间的增加热烧蚀率逐渐增大，但辐照一定时间后，热烧蚀率趋于稳定；峰值功率密度的增加能明显提高热烧蚀率，但随峰值功率密度的增加，热烧蚀率的增幅减小直至趋于一定值；热烧蚀率不随脉冲激光重复频率和脉宽的变化而改变，当峰值功率密度一定时，热烧蚀率一定，质量烧蚀率与频率和脉宽成正比。

Thermal ablation law of cured epoxy under long pulse laser irradiation

The thermal ablation rate and mass ablation rate of cured E-51 epoxy under long pulse laser irradiation were studled. The effects of irradiation time, maximum power density, frequency and pulse width were discussed. The thermal ablation rate gradually increased along with the irradiation time, and then reached a certain value. The effects of frequency and pulse width were little. With the maximum power density increasing, the thermal ablation rate rose first obviously and then the thermal ablation rate approached to a definite value. With a fixed maximum power density, the thermal ablation rate was certain and the mass ablation rate was directly proportional to laser frequency and pulse width. The results were verified according to the optical property, surface morphology and surface temperature in irradiation area of cured epoxy.