Research On The Influence Of Aluminum Surface Roughness On Laser-induced Shock Wave

When high peak power and narrow pulse laser interacts with the surface of a solid material,the laser-induced shock wave generated has wide applications in laser shock strengthening and laser propulsion.Mastering the characteristics and laws of shock waves,improving control accuracy,and then enhancing the efficiency of laser-induced shock waves is of great significance for exploring how to improve the intensity of laser-induced shock waves and their efficient application.This paper focuses on the roughness of the metal surface,and studies the evolution characteristics of laser-induced shock waves from both theoretical and experimental aspects.The research results can provide theoretical guidance and data support for the application of shock waves.To address the issue of the influence of roughness on nanosecond pulse laser-induced shock waves,this paper constructs a numerical calculation model based on relevant theories such as laser-induced phase transition of metal targets and shock wave evolution,and calculates the relationship between the target’s absorption rate and roughness.The influence of the target surface roughness on laser-induced shock waves is analyzed.The results show that the roughness of the target has a significant impact on its absorption rate.Within a certain range,the higher the roughness of the target,the stronger its ability to absorb laser energy,and the higher the energy utilization rate of nanosecond pulse laser,thus producing a more intense shock process.Based on the numerical calculation analysis,this paper optimizes the experimental system for nanosecond pulse laser-induced shock waves and conducts a study on the characteristics of laser-induced shock waves on the surface of aluminum with different roughness.Based on the evolution image and speed of the shock wave,the influence of roughness on the evolution of shock waves is analyzed.The impact of aluminum surface roughness on the wavefront propagation speed and propagation distance of shock waves under different peak power density nanosecond pulse laser is obtained.The research results show that roughness has a significant impact on the intensity of nanosecond pulse laserinduced shock waves.With the increase of aluminum surface roughness,the shock wavefront speed accelerates,and the change trend of the wave speed becomes steeper.At the same time,the shock pressure is significantly enhanced,and the experimental and theoretical results are consistent.This research work can provide certain theoretical and experimental support for the development and optimization of laser shock strengthening,laser propulsion,and other fields.