长脉冲激光与金属相互作用影响分析

Analysis of Long Pulse Laser-metal Interaction

通过使用1 064 nm,Nd:YAG长脉冲激光作用在金属材料从理论和数值模拟的角度研究各种因素对激光加热效应的影响。针对国内外目前长脉冲激光与物质相互作用研究的现状,分析和模拟了长脉冲激光与材料相互作用过程中的各种现象和问题,特别是对长脉冲激光与金属相互作用时的温度场及应力场进行了较全面的理论分析。就靶材物质对激光的反射、吸收和转化的基本机制,激光对金属材料加热的温度场、应力场及其熔融的温度场和固-液态界面的移动速度及液态质量迁移、激光引起材料的气化、烧蚀的质量迁移,进行了系统的讨论。

The effect of a variety of factors on the laser heating from the theory and numerical simulation,by using 1 064 nm Nd：YAG long pulse laser interaction with metal.The phenomenon and problem in the pro cess of the laser-matter interaction are analyzed and simulated,as for laser-metal interaction research at home and abroad,especially the temperature field and stress field of the long pulse laser-metal interaction are ana lyzed theoretically.The effect of the basic mechanism of the laser reflection,the absorption and the transforma tion on the target material,the temperature field,the stress field and the melting temperature of the metal mate rial heated by the laser,the moving velocity of the solid-liquid interface,the liquid mass transfer,the material gasification and the ablation mass transfer are analyzed.