钎焊过程数值模拟研究进展

Progress in the Numerical Simulation of Brazing Process

综述了近年来钎焊数值模拟技术的研究进展,并对数值模拟技术向系统化、精细化和精确化发展的趋势进行了预测.得出了以下结论:1)采用有限容积法和分子动力学法对钎料熔滴的润湿铺展行为进行模拟,有助于研究多物理场耦合条件下钎焊工艺参数对钎料熔滴在基体表面的润湿、铺展和填缝的影响;2)有限元法可以较为准确地模拟钎焊接头应力场和残余应力分布、钎焊过程的温度场,以及对接头力学性能进行评估,模拟结果与试验结果基本吻合.简化本构模型、引入材料性能参数、考虑界面传质和反应产物的影响等方面仍然是未来研究的难点和重点.

：Recent research progress of numerical simulation on brazing was summarized, while the development tendency of systematization, refinement and precision for simulation technology was predicted. It concludes that 1） the finite volume method and molecular dynamic methods have been used to stimulate the wetting and spreading behavior of molten filler droplet on basement. It is helpful to investigating the influence of parameters on the wetting, spreading and gap-filling of filler metal under multi-physical field coupled brazing processes. 2） The finite element method has been used for accurate stimulation of stress field and distribution of residual stress of brazed joints, the temperature field during brazing process, and estimation of mechanical property of brazed joint respectively. The simulation results are in good agreement with the experimental results. But some key aspects, such as the reasonably simplified constitution models, introduction of material properties parameters and consideration of the influence of interface mass-transfer and reaction compounds etc. are still difficulties and focuses of research in the future.