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10mm×5mm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10Mw，传输效率为80％，在加工试样表面得到了最大为-160．55MPa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。
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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第F06期210-215,共6页
Acta Optica Sinica
基金
国家自然科学基金（51175236）、江苏省光子制造科学与技术重点实验室开放基金（GZ201107）、江苏省2012年度普通高校研究生科研创新项目（CXZZ120659）和江苏大学学生科研立项（11A373）资助课题.
关键词
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
