碳纤维增强复合材料与钛合金激光连接仿真  

Simulation Study of Laser Joining for Carbon Fiber Reinforced Plastics and Titanium Alloys

作　　者：景若木 徐洁洁[1] 肖荣诗[1] 黄婷[1] Jing Ruomu;Xu Jiejie;Xiao Rongshi;Huang Ting(High-Power and Ultrafast Laser Manufacturing Lab,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部高功率及超快激光先进制造实验室,北京100124

出　　处：《中国激光》2023年第8期1-11,共11页Chinese Journal of Lasers

基　　金：北京市自然科学基金-北京市教育委员会科技发展计划重点项目(KZ202010005011)。

摘　　要：为了研究不同工艺参数对TC4钛合金与连续编织碳纤维增强聚醚醚酮基复合材料(CFPEEK)的激光焊接接头的影响规律,并对焊接工艺窗口进行预测,使用ABAQUS软件建立基于热传导的有限元仿真模型,计算TC4钛合金/CFPEEK激光焊接接头的温度场分布。针对CFPEEK中连续编织碳纤维的实际铺层情况,在建模时对复合材料进行分层处理,将碳纤维层视为正交性质的材料。在此基础上探究了激光功率、焊接速度、光斑尺寸对焊缝熔化深度及宽度的影响规律,计算结果与实际试验结果吻合度较高,激光功率、焊接速度、光斑尺寸等工艺参数均对接头结合处的温度有较大影响。经过多组参数的计算,得到了TC4钛合金/连续编织CFPEEK激光连接的预测工艺窗口。结果表明,所建立的有限元模型能够有效模拟连续编织CFPEEK与TC4钛合金激光连接的温度场分布,对实际试验有一定指导意义,可降低试验成本。Objective Carbon fiber reinforced plastics(CFRP)and titanium alloys are used in modern equipment owing to their high specific strength,corrosion resistance,and fatigue resistance.Heterogeneous joints consisting of CFRP and metals are widely used in the aerospace industry.Laser joining of CFRP and metals has recently attracted significant interest owing to its high joining efficiency and superior joining quality compared to mechanical joining,adhesive bonding,ultrasonic welding,etc.Because the process is both timeconsuming and labor-intensive,the accurate prediction of appropriate process parameters is highly desired.In this study,a realistic three-dimensional finite element model is developed for the numerical simulation of the temperature field during the laser joining of carbon-fiber reinforced polyetheretherketone matrix composites(CFPEEK)with a poly ether ether ketone(PEEK)resin matrix and TC4 titanium alloy,and the laser joining process is investigated.Methods A fiber laser with a laser wavelength of 1070 nm and collimator focal length of 200 mm is used in the laser joining experiment(Fig.1).A rectangular spot is obtained by beam shaping using an integrating mirror,with a focal length of 200 mm and a spot size of 0.6 mm×5.8 mm.The laser power is 3500 W,and the welding speed ranges from 5 mm/s to 40 mm/s.The dimensions of the TC4 titanium alloy and CFPEEK are 60 mm×30 mm×2 mm and 60 mm×25 mm×2 mm,respectively.The CFPPEK is composed of a PEEK matrix and carbon fibers.The carbon fiber layers are alternately layered with PEEK layers and have a 0°/90°cross-weave(Fig.2).The PEEK layer is 0.1 mm thick on average,and the carbon fiber layer is 0.2 mm thick on average.Results and Discussions A three-dimensional model of laser joining of TC4/CFPEEK is established based on the fact that laserinduced heat input is transferred to the bonding interface via heat conduction and actual experimental conditions.The grid size is graded to improve the simulation accuracy while maintaining computational efficiency(Fig.3).Im

关 键 词：激光技术 激光连接 碳纤维增强复合材料 TC4钛合金 数值模拟 

分 类 号：TN249[电子电信—物理电子学]