The Forming Criteria And Rebound Study Of TC4 Titanium Alloy Under The Action Of Nanosecond Laser

Titanium alloy is widely used in aviation components due to its excellent comprehensive mechanical properties.With the development of the aviation industry,the titanium industry is growing at a rapid rate,countries are also developing new low-cost and high-performance titanium alloys,and strive to make titanium alloys enter the civil industry with huge market potential.In this context,higher requirements are put forward for the research of titanium alloy processing technology.Based on the analysis of the advantages of laser shock forming technology and the current research status of relevant dynamic damage detection technology at home and abroad,this paper uses a combination of numerical simulation and experimental research to discusses the laser parameters and the thickness of the target material on the forming effect and failure characteristics systematically.And the forming process of titanium alloy material under high strain rate is monitored by means of high-speed digital camera.In addition,based on the rebound phenomenon of titanium alloy material found in the experiment and simulation process,a systematic analysis and research are carried out.The research results in this paper provide reliable data support and experience accumulation for the study of the microstructure and properties of titanium alloys under laser shock,and at the same time provide a guiding basis for the optimization of the process parameters of laser processing titanium alloys.The main contents of this paper are as follows:(1)Using ABAQUS finite element analysis software as the platform,the simulation models of different laser parameters,target thickness and impact times were constructed respectively.According to the displacement curve and morphological characteristics of the back of the target material,the deformation law of the titanium alloy target material under laser shock is obtained.(2)The deformation law and failure damage of titanium alloy under laser shock are experimentally studied,and the correctness of the numerical simulation results is verified;through a large amount of experimental data,the forming criteria of titanium alloy sheet are obtained preliminary and systematically;during the experiment,it was found that when the diameter of the laser spot is 5mm and the pulse energy is 10 J,the titanium alloy target with a thickness of 0.08 mm rebounded;the experimental monitoring of the laser shock target forming process has captured the plasma generation and observed the morphologic changes of the target back at different times.(3)The rebound phenomenon of titanium alloy targets under laser shock is systematically studied via simulation and experiment.It is found that when the diameter of the laser spot is 5mm and the pulse energy is 10 J,the experimental measurement results of a titanium alloy target with a thickness of 0.08 mm are highly consistent with the simulation,and rebound occurs.Subsequently,a simulation analysis was performed on a target with a thickness of 0.05 mm,and it was also found that the rebound phenomenon occurred,and the duration and area of the rebound were relatively small.