Ti/TiAl钎焊接头应力的数值模拟

Numerical simulation of thermal/residual stresses in brazed Ti/TiAi joints

利用有限元方法,对采用银基钎料钎焊钛合金与TiAl时接头在冷却过程中的应力分布情况进行了分析,并研究了连接温度对应力分布的影响。结果表明,在钎料与钛合金和TiAl的连接界面处均存在一定程度的应力集中,其中钎料与钛合金的连接界面应力相对较大。连接温度变化时,应力的分布基本没有变化,只是随着连接温度的降低,最大应力的数值随之减小。

Finite element method was used to calculate residual stress that developed when TiAl intermetallics was bonded to Ti alloy by Ag-based filler metal during cooling from joining temperature. The stress distribution of the joint in different joining temperature was studied. The results showed that the residual stress concentration between three layers existed at the interface. Especially, the maximum value of the residual stress between TiAl and filler metal was higher than that between Ti alloy and the filler metal. Stress distribution was shown to be almost not dependent upon joining temperature. But when the joining temperature became lower, the maximum value of the residual stress at the same position decreased accordingly.