光学学报, 2013, 33 (s1): s114016, 网络出版: 2013-06-07
光纤传输激光喷丸强化的实验研究
Experimental Study on Fiber-Coupled Laser Shock Peening
激光技术 激光喷丸 激光传输 光纤损伤 残余应力 laser technique laser shock peening laser delivery fiber damage residual stress
摘要
为了使激光喷丸(LSP)强化技术更有效、灵活、安全地应用于工业加工中,使用光纤作为强激光脉冲的载体,构建了一种基于光纤传输的高功率激光喷丸强化系统。采用N-ON-1方法检测光纤的损伤阈值,确定相应激光器的脉冲能量,随后对6061-T6铝合金板料进行大面积喷丸强化,使用X射线衍射仪在金属表面10 mm×5 mm的区域内检测残余应力分布,同时对比两种激光光斑搭接率(相切、50%搭接)下喷丸强化后的效果。实验结果表明,此系统的峰值功率为10 MW,传输效率为80%,在加工试样表面得到了最大为-160.55 MPa的残余压应力,为激光喷丸强化的柔性制造提供了一定的理论依据。
Abstract
In order to broaden the industrial application range of laser shock peening (LSP), a system with 10 MW laser pulses delivered by a standard 1000 μm multi mode optical fiber is developed. The system is composed by three units, laser coupling unit, laser delivery unit and laser collimation unit. First of all, N-ON-1 method is selected to measure optical fiber damage threshold and laser pulse energy is determined accordingly. Then, fiber-coupled LSP is carried out on 6061-T6 aluminum alloy sheet metal, and two spot layout schemes are studied to obtain the optimum residual stress. Residual stress is measured by X-ray diffraction method. The largest residual stress induced by LSP on the surface of sample is -160.55 MPa. This system can provide some strong theoretical basis for the flexible manufacture of laser shock technology.
安中伟, 周建忠, 黄舒, 陈明阳, 朱兴龙, 孟宪凯, 冯爱新. 光纤传输激光喷丸强化的实验研究[J]. 光学学报, 2013, 33(s1): s114016. An Zhongwei, Zhou Jianzhong, Huang Shu, Chen Mingyang, Zhu Xinglong, Meng Xiankai, Feng Aixin. Experimental Study on Fiber-Coupled Laser Shock Peening[J]. Acta Optica Sinica, 2013, 33(s1): s114016.