摘要
为了研究不同激光功率密度下空气中冲击波幅值和飞行时间分别与工件中冲击波幅值和残余压应力的变化关系,采用工件为45#钢、铝箔为吸收层、水为约束层、声发射传感器和聚偏氟乙烯压电膜传感器同时对空气和工件中的激光诱导等离子体冲击波进行测量.结果表明,随激光功率密度的增加,空气中冲击波飞行时间非线性的减少,空气和工件内冲击波幅值非线性的增加,工件中残余压应力值接近饱和.进行多项式拟合,获得了空气中冲击波幅值与工件内冲击波幅值、空气中冲击波飞行时间与工件内残余压应力的经验公式,为激光冲击强化质量评估提供一定的理论参考.
In order to study the relationship between the amplitude of the shock wave in air and the amplitude of the shock wave in the workpiece, and the relationship between time-of-flight of the shock wave in air and the compressive residual stress in the workpiece respectively, the acoustic emission sensor and the polyvinylidene fluoride piezoelectricity gauge were used to detect laser induced plasma shock wave in air and the workpiece. In the experiment, the workpiece is 45~ steel, the absorption layer is AI foil, and the confinement layer is fluid overlays. The results show that with laser intensities increases, time-of-flight of the shock wave in air decreases nonlinearly, and the amplitude of the shock wave in air and workpiece increases nonlinearly, and the compressive residual stress closes to saturation. Finally, the empirical formulas for the amplitude of the shock wave in air and the amplitude in the workpiece, and for time of flight of the shock wave in air and the compressive residual stress in the workpiece were established respectively, which could provide theoretical reference for quality assurance of laser shock processing.
出处
《激光技术》
CAS
CSCD
北大核心
2010年第5期694-696,共3页
Laser Technology
基金
国家自然科学基金资助项目(50735001)
关键词
激光技术
激光冲击强化
质量评估
冲击波
幅值
飞行时间
laser technique
laser shock processing
quality assurance
shock wave
amplitude
time of flight
