摘要
针对毫秒脉冲-连续激光组合激光辐照铝合金材料的温度场特征,基于热传导理论,建立二维轴对称热模型。采用有限元对毫秒脉冲-连续组合激光辐照铝合金的过程进行数值模拟,得到不同加载时间间隔及不同光斑半径组合情况下激光辐照铝合金表面温度场分布及变化规律。结果表明,靶材中心点温度随激光加载时间间隔的增大而升高。在脉冲激光辐照周期结束的同时,再施加连续激光,此时连续激光辐照靶材所造成的温度会显著增加。组合激光辐照铝合金的温度场主要由连续激光决定,但如果选择合适的脉冲激光参数预热,尤其是脉冲激光的功率密度大于8.8×10^(4) W/cm^(2)时,能适量提高靶材中心点的温度。
Based on the theory of heat conduction,a two-dimensional axisymmetric thermal model was established for the temperature field characteristics of aluminum alloy irradiated by a combination of millisecond pulse and continuous laser.The process of laser irradiating aluminum alloy was numerically simulated by finite element method,and the temperature field distribution and variation rule of laser irradiating aluminum alloy surface under different loading time interval and different spot radius were obtained.The results show that the temperature of target center increases with the increase of laser loading time interval.At the end of the pulse laser irradiation period,the temperature of the target radiated by the continuous laser will increase significantly.The temperature field of aluminum alloy irradiated by combined laser is mainly determined by continuous laser,but the temperature of the center point of the target can be increased appropriately if appropriate pulse laser parameters are selected,especially when the power density of pulse laser is greater than 8.8×10^(4) W/cm^(2).
作者
李隆
杨建花
张春玲
Li Long;Yang Jianhua;Zhang Chunling(School of Science,Xi'an University of Architecture&Technology,Xi'an,Shanxi 710055,China;Institute of Applied Physics,Xi'an University of Architecture&Technology,Xi'an,Shanxi 710055,China)
出处
《应用激光》
CSCD
北大核心
2022年第7期112-117,共6页
Applied Laser
基金
国家自然科学基金(11705136)。
关键词
激光技术
毫秒脉冲激光
连续激光
组合激光
数值模拟
laser technology
millisecond pulse laser
continuous laser
combined laser
numerical simulation
