摘要
针对结构陶瓷具有高脆性,在激光加工时容易因热应力而产生微裂纹的问题,建立了结构陶瓷激光加工时的非定常温度场模型和热弹性热应力模型,并采用求相应泛函极值的方法进行了求解.对这些模型进行了在脉冲式激光作用条件下的有限元法数值模拟,分析加工参数与热应力的关系,用以指导在加工中避免或减少裂纹的产生.模拟结果表明了该方法的合理性和有效性.
Structural ceramics are very hard and brittle, and liable to microcrack because of the thermal stress during the process of laser beam machining (LBM). In order to solve the problem, models for LBM of structural ceramics in transient temperature field and thermal elastic stress field were developed and solved by transforming them to functional extremum problems. The models in pulsed laser beam conditions were numerically simulated with finite element method to analyze the relationship between the machining parameters and the thermal stress, so that the results could be applied to reduce or avoid cracks. The simulation results accorded with the results of previous research and showed the validness of these models.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2004年第9期1204-1207,共4页
Journal of Zhejiang University：Engineering Science
关键词
结构陶瓷
激光加工
热应力
微裂纹
热弹性
泛函极值
Finite element method
Machining
Mathematical models
Microcracks
Pulsed laser applications
Stress analysis
Temperature distribution
Thermal stress
