摘要
研究激光单脉冲作用后漆层表面的凹坑形貌可以有效抑制激光多参数叠加效应及脉冲重叠的光热与光力效应,有助于揭示激光与材料的作用机制,同时可为激光参数优化提供依据。本团队利用实验凹坑形貌数据获得漆层去除深度d及能量密度F的关系式,并基于烧蚀机制建立了高斯激光单脉冲作用后模拟漆层凹坑形貌的数学模型,采用MATLAB对13.58~27.16 J/cm^(2)能量密度下的凹坑形貌进行了模拟与验证。结果表明:低能量密度(13.58~16.98 J/cm^(2))下,凹坑深度和直径误差均小于5%,凹坑表面近似为旋转抛物面,凹坑剖面轮廓近似为抛物线;高能量密度(20.37~27.16 J/cm^(2))下,凹坑深度误差小于5%,但凹坑直径误差高达40%,模拟结果与实验结果存在显著差异。误差分析表明,在高能量密度下,等离子冲击与热辐射机制对凹坑形貌具有显著影响。基于上述分析对模型进行修正,修正模型对凹坑深度和直径的模拟误差均控制在5%以内,显著提高了模型模拟的准确性。基于凹坑形貌实验数据建立的形貌模型以及该模型的验证,不仅揭示了不同能量密度下激光与材料主要作用机制的差异,还为高、低能量密度下除漆效果的精确控制及激光参数优化提供了参考。
Objective Understanding the crater morphology on the surface of a paint layer after a single laser pulse can effectively suppress the superposition effects of multiple laser parameters and the photothermal and photomechanical effects of a pulse overlap.This helps reveal the laser-material interaction mechanism and provides a basis for the optimization of laser parameters.In recent years,many scholars have simulated the morphology of craters on the surface of a paint layer with the help of finite element software after nanosecond pulsed laser action based on the ablation mechanism.The laser parameters are then optimized based on the simulation results.For nanosecond pulsed lasers,the main mechanism of the laser-material interaction varies at different energy densities(the main mechanism is the ablation mechanism at low energy density,and the plasma shock and thermal radiation mechanism at high energy density).The ablation mechanism,plasma shock,and thermal radiation mechanism have different effects on the morphology of the crater.This study aims to establish a model of the damage form and the removal process of the paint layer during a single pulse of a nanosecond laser under different energy densities,to reveal the differences in the influence of the laser-material mechanism on the morphology of craters under different energy densities,and to provide a reference for the precise control and parameter optimization of the paint removal effect at high and low energy densities.Methods A nanosecond pulsed laser with a wavelength of 1064 nm and beam energy following a Gaussian distribution was applied to the epoxy primer surface.The diameter,depth,and three-dimensional morphology data of the craters on the surface of the paint layer were measured using a 3D optical surface profiler after the laser pulse.A simulation model of crater morphology was established based on the ablation mechanism and the fitting relationship between the depth(d)of the craters and energy densities(F).MATLAB was used to simulate the morphology o
作者
杨文锋
林德惠
钟勉
李绍龙
钱自然
刘国春
曹宇
徐艺
李果
张赛
Yang Wenfeng;Lin Dehui;Zhong Mian;Li Shaolong;Qian Ziran;Liu Guochun;Cao Yu;Xu Yi;Li Guo;Zhang Sai(Civil Aircraft Composites Maintenance Research Center,Civil Aviation Flight University of China,Guanghan 618307,Sichuan,China;Laser and Optoelectronic Intelligent Manufacturing Research Institute,Wenzhou University,Wenzhou 325035,Zhejiang,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2023年第4期157-165,共9页
Chinese Journal of Lasers
基金
四川省科技厅重点研发项目(2021YFSY0025)。
关键词
激光技术
激光除漆
单脉冲
凹坑形貌
模拟与验证
laser technique
laser paint removal
single pulse
crater morphology
simulation and verification
