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:用有限差分法对强脉冲激光难熔金属表面烧蚀过程的温度场进行了三维数值仿真计算。计算模型在能量平衡方程的基础上 ,将入射的脉冲激光在时间与空间上的分布以Gauss分布考虑 ,同时考虑工件尺寸、工件材料热物理性质及对流辐射造成的表面热损失等对温度场的影响。文章应用交替方向隐式方法建立差分方程 ,对该数学模型进行计算 ,数值模拟了难熔金属钛、钼在强脉冲激光烧蚀下的温度场变化 ,并将数值解与热导方程的解析解进行了分析比较。利用文中计算模型 ,可预测出烧蚀层的厚度 ,并可对激光加工参数进行优化选择
: The finite difference method was used to simulate the temperature field in ablation process of intense pulsed laser refractory metal. On the basis of the energy balance equation, the calculation model considers Gaussian distribution of the incident pulsed laser light in time and space. Meanwhile, considering the influence of the size of the workpiece, the thermophysical properties of the workpiece material and the heat loss caused by convection radiation on the temperature field influences. In this paper, the differential equation is established by using the alternating direction implicit method. The mathematical model is calculated and the temperature field changes of the refractory metal titanium and molybdenum under the intense pulsed laser ablation are numerically simulated. The numerical solution and the analytical solution of the thermal conductivity equation Analyzed and compared. Using the calculation model, the thickness of the ablation layer can be predicted, and the laser processing parameters can be optimized