皮秒激光切割AFRP复合材料实验研究

Experimental study on picosecond laser cutting AFRP composites

采用紫外皮秒激光(λ=355 nm)、绿光皮秒激光(λ=532 nm)和红外皮秒激光(λ=1 064 nm)的三波长皮秒脉冲固体激光器,对1 mm厚芳纶纤维增强树脂基复合材料(Aramid fiber reinforced polymer,AFRP)进行单次扫描切割实验,用光学显微镜(OM)和SEM测量了上切缝宽度、切缝深度和上表面热影响区宽度,并计算了切缝锥度,分析了激光波长、功率及扫描速度等参数对切口形貌和切缝质量的影响。结果表明:相比于红外激光和绿光激光切割AFRP,紫外激光的切割效率更高,切割质量更好;上切缝宽度、切缝深度和上表面热影响区宽度随着激光功率的增大而增大,随着激光扫描速度的增大而减小;切缝锥度随着激光功率的增大而减小,随着激光扫描速度的增大而增大;适当降低激光扫描速度,有利于提高切缝深宽比。

A three wavelength picosecond pulsed solid-state laser with ultraviolet picosecond laser(λ=355 nm),green picosecond laser(λ=532 nm) and infrared picosecond laser(λ=1 064 nm) was used to cut 1 mm thick aramid fiber reinforced polymer(AFRP) by a single pass scanning. The slit width, thickness and thickness were measured by optical microscope(OM) and scanning electron microscope(SEM). The effects of laser wavelength, laser power and scanning speed on the notch shape and quality were analyzed. The results show that: compared with the infrared laser and green laser cutting AFRP, the cutting efficiency of ultraviolet laser is higher, and the cutting quality is better;the width of upper slit, slit depth and the width of upper surface heat affected zone increase with the increase of laser power, and decrease with the increase of laser scanning speed;the slit taper decreases with the increase of laser power, and increases with the increase of laser scanning speed. When the laser scanning speed is reduced properly, the ratio of slit depth to width is improved.