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激光喷丸强化是利用高能短脉冲激光和材料相互作用诱导的冲击波压力使材料表面改性的技术,适度残余应力场分布对应着特定的强化效果,需要优化的激光喷丸轨迹来实现。连续激光喷丸过程中冲击波压力及其残余应力的变化很难用实验来测量分析,导致强化过程不能有效控制。采用数值分析技术,在激光喷丸有限元建模的基础上,解决了脉冲激光束连续逐点喷丸强化的模拟轨迹控制。以连续单点单次和单点多次激光喷丸6061-T6铝合金为研究对象,对冲击波压力传播、应力分布及表面曲度变化进行数值分析,揭示激光喷丸强化中激光冲击波传播及应力变化内在的相互关系,为激光喷丸实验过程中参数优选和表面质量的有效控制提供理论依据。
Laser shot peening is a technique that uses the shock wave pressure induced by the interaction of high energy short pulse laser and material to modify the surface of the material. Appropriate residual stress field distribution corresponds to the specific strengthening effect, which needs to be optimized by laser shot peening. Continuous laser shot peening shock wave pressure and residual stress changes is difficult to experimentally measure the analysis, resulting in the strengthening process can not be effectively controlled. Based on the finite element modeling of laser shot peening, the numerical simulation technique was used to solve the simulation trajectory control of continuous shot peening by pulsed laser beam. A series of single shot and single shot multi-shot laser 6061-T6 aluminum alloy were used as the research object. Numerical analysis of shock wave pressure propagation, stress distribution and surface curvature was carried out to reveal the laser shock wave propagation and stress in laser shot peening The internal relations of the changes, provide the theoretical basis for the parameter optimization and the effective control of the surface quality during the laser shot peening experiment.