复合钎料钎焊Al_2O_3接头剪切应力场的数值模拟

Numerical simulation of shear stress of Al_2O_3 joint brazed with composite filler materials

对Al2O3颗粒增强复合钎料钎焊Al2O3/Al2O3接头的残余应力场进行了数值模拟,分析了Al2O3陶瓷颗粒的加入对陶瓷接头残余剪切应力的影响.模拟发现,陶瓷接头的最大应力位于陶瓷-钎缝界面,陶瓷颗粒的加入对钎焊接头应力起到了缓解作用,其缓解程度随陶瓷颗粒体积分数的增加而增大;在陶瓷颗粒百分比一定的情况下,钎缝厚度的增加亦可缓解陶瓷接头的剪切应力.为了验证模拟结果的正确性,对陶瓷钎焊接头进行了剪切试验.结果表明,当陶瓷颗粒体积分数为0～15%时,陶瓷接头的抗剪强度随着颗粒体积的增加而增加.

The numerical simulation on shear stress of Al2O3/Al2O3 joints brazed with the Al2O3 particles reinforced composite filler materials is processed.And then the effect of Al2O3 particles on residual shear stress of ceramic joints is researched.The results show that the maximum shear stress appears in the interface between ceramic and filler materials.The Al2O3 particles in composite filler materials can decrease the shear stress of ceramic joints and the effect on decreasing stress heightens with the increase of the volume percent of ceramic particles.Moreover,the residual shear stress decreases with the increase of thickness of filler materials.The results of shear experiment on Al2O3/Al2O3 joints show that the shear strength increases with the increase of the volume percent of ceramic particles when the volume percent changes from 0% to 15%,which verifies the rationality of the results of numerical simulation.