レーザーピーニングのためのレーザーアブレーション生成プルームの シミュレーション

抄録

We developed an Integrated Simulation code for Laser Ablation Peening (ISLAP) to estimate the plume pressures produced by laser ablation in a water confinement regime, and to calculate the stress and strain formations in solid metals. Since controlling laser-ablation-produced-plumes is essential in laser peening, laser ablation phenomena must be studied in a water confinement regime by computer simulations. In ISLAP, the phase transitions from solid to liquid and from liquid to gas are modeled by the improved Anisimov formula. We evaluated the formation of stress and strain in solid metals by solving hydrodynamics equations, the strain-displacement relation, and the stress-strain relation. The input physical parameters are the laser peak intensity, the laser pulse duration, the laser wavelength, the temporal pulse shape, the material type, and the type of confinement material (vacuum, air, water, or glass). Using ISLAP, we can estimate the pressures of the plumes, the stress and the strain in solid metals, the plume lengths, and the ratio between the thermal energy and the internal energy of the plumes.