钠钙玻璃板激光热应力切割过程的有限元仿真

Finite element simulation of laser-controlled thermal stress separation of soda-lime glass plate

为了使脆性材料板的激光热应力切割得以完成并提高切割质量,提出了一种切割过程的仿真方法.利用有限元法分析玻璃板在激光扫描过程中的瞬态热传导,求得瞬态温度场.按热弹性平面应力理论分析热应力场,并采用最大切向应力准则和节点松弛法模拟板材的开裂.通过该仿真方法分析了钠钙玻璃板的切割过程,根据所导致的温度最高值和板材的开裂情况,研究了激光功率和激光扫描速度这两个关键参数对切割的影响,并给出了可完成连续切割的参数范围.仿真结果表明,该方法可以对激光功率和扫描速度等激光参数进行优化调节,从而改善切割的质量.

To enable laser-controlled separation of brittle materials and to improve the cutting quality , a simulation method for the separation process was proposed. The transient thermal transfer during laser irradiation wasanalyzed by employing finite element technique. After the transient temperature field was obtained, the corresponding thermal stresses were calculated as a thermo-elastic plane stress problem, and the induced crack propagation was simulated by the maximum tangential stress criterion and the node release method. The simulation of soda-lime glass plate separation was carried out by the present method. According to the induced maximum temperature and the plate crack propagation, the effects of two main parameters including laser power and laser scanning speed on the separation was investigated, and the range of the two parameters for continuous separating was given. Results show can be used for predetermining and optimizing the separation parameters for quality. that the simulation method improvement of separation