工艺参数对激光辅助预应力成形效率的影响

Effects of Process Parameters on Efficiency of Laser-Assisted Pre-Stress Forming

针对激光辅助预应力成形问题,建立了相应的有限元模型,并进行了实验验证。通过无量纲参数,研究了预应力水平和激光工艺参数对激光辅助预应力成形效率的影响规律。结果表明,在弹性范围内,预应力越大,成形效率越高;在扫描速度和功率密度给定的情况下,成形效率随光斑半径增加而增加;在扫描速度和光斑半径给定的情况下,成形效率随功率增加而增加;在光斑半径、输入能量给定的情况下,成形效率随扫描速度增加而增加。

A finite element model（FEM） based on numerical model is established to study the process of laser-assisted pre-stress forming and further verified with experimental data.Based on the verified FEM model,the effects of pre-stress and laser parameters on forming efficiency are investigated via a set of dimensionless quantities.A higher pre-stress level results in a higher forming efficiency in the elastic range.A larger beam radius at constant scanning velocity and power density,or a higher power at constant scanning velocity and beam radius,or a faster scanning velocity at constant beam radius and injected energy,results in a higher forming efficiency.