钎缝圆角几何形状对Al-Al2O3钎焊件剪切应力分布的影响

异种材料连接结构中由于被连接材料的热膨胀系数不匹配，焊后冷却过程将在钎焊件内部导致较大的应力。同时，钎缝圆角几何形状对这一热应力分布有重要影响。本文采用有限元数值模拟方法研究了钎缝圆几何形状对Al-Al2O3异种材料钎焊件内部剪切应力分布的影响。计算结果表明，钎缝圆角的最佳几何形状为钎缝伸出长度略大于钎缝高度的凹型。

Effect of Fillet Geometry on Shear Stress Distribution in Al-Al2O3 Soldering Assembly

In the welding construction made of different materials,the cooling stage after welding will cause thermal stress due to the mismatch of coefficient of thermal expansion between different materials.Meanwhile,the fillet geometry has played an important role on this thermal stress distribution.In this work,by means of finite element numerical simulation,the effect of fillet geometry on the shear stress distribution in the Al-Al2O3 soldering assembly had been analyzed.The calculating results showed that the optimized geometry of soldering fillet is a concave shape in which the extruding length of the soldering fillet is a little more than the gap height.