摘要
激光与材料的相互作用一直是备受人们关注的问题。从工业上的激光热处理技术,到军事上的激光破坏机理研究,均与之密切相关,它在激光加工应用等领域中的诱人前景,激励着这方面的研究工作不断前进。笔者利用有限元理论,对不同模式激光加热Al2O3陶瓷的热传导过程及热应力分布进行了数值模拟,得到了Al2O3陶瓷的温度场和热应力场分布。根据热传导方程和热应力方程,建立了不同模式的激光辐照下中瞬态温度场和热应力场的物理模型。模拟计算了Al2O3陶瓷在不同模式激光照射下的温度场。数值模拟结果表明:吸收的激光能量主要分布在光斑半径以内,因此随着加热时间增加形成的径向温度梯度也越大;陶瓷内部沿轴向不同深度各点的温度随时间增长曲线在加热初始阶段均为S型。笔者的研究结果可为激光切割陶瓷加工过程的数值模拟研究提供参考。
Laser-material interaction has always been the concern of issues,from the industrial laser heat treatment technology to the military mechanism of laser damage are closely related to it,its attractive future in the field of laser processing applications inspired the research work in this area continues to advance.In this paper,the heat conduction process of different modes laser heating Al 2O 3 ceramics is numerical simulated by using the finite element method(FEM).the temperature field and thermal stress distribution of Al 2O 3 ceramics is obtained.The physical model of the transient temperature field and thermal stress field under different modes laser irradiation is established in accordance with classic thermal conduction equation and thermal stress equation.This paper simulated the temperature field and the coupled stress field under laser of different modes.Numerical results indicate:the laser energy absorbed mainly distributed within the spot radius,for this reason,The radial temperature gradient formed became larger when the heating time increased;the temperature growth curves over time of each point to a different depth along the axial direction in the ceramic internal are all S-type in the initial stage of heating.The results in this article may provide the research method and theory for the numerical simulation of laser cutting ceramic processing.
作者
赵婧
Zhao Jing(Yulin Hanting Chemical Technology&Development Co.Ltd,Shaanxi,Yulin,718100)
出处
《陶瓷》
CAS
2019年第11期25-34,共10页
Ceramics
关键词
激光加工
AL2O3
陶瓷
数值分析
温度场
热应力场
Laser process
Al 2O 3 ceramics
Numerical analysis
Temperature field
Thermal stress field
