摘要
按照“在研究非稳态扩散问题时，稳态扩散研究中的有些假定仍然是有效的”的观点，利用碳的守恒定律给出碳浓度的跳跃条件，结合扩散通量条件，推导结果发现这种内边界条件无法解决Ｆ／Ａ界面上的迁移．提出用扩散通量和扩散驱动力活度的边界连续性条件来处理有限差分计算中差分网格的内边界，使有限差分的解的收敛性和稳定性得到了较好的控制．
According to the point “some assumptions about steady state diffusion are valid when non steady state diffusion is studied”and carbon conservation law,the carbon contents' leaping condition is given.Combining with the diffusion flux condition,we find that the inner boundary condition can not determine the carbon's migration in F/A interface while using finite difference mehtod to solve the problem.By means of the continuous conditions of diffusion flux and carbon's activities at the inner boundary,the calculation can be successfully developed.
出处
《武汉水利电力大学学报》
CSCD
1998年第6期92-96,共5页
Engineering Journal of Wuhan University
关键词
异种钢焊接
碳迁移
边界条件
接头
DMWs
carbon migration
finite difference method
boundary condition
