Theoretical Study and Numerical Simulation of the Stress Fields of the Al_2O_3 Joints Brazed with Composite Filler Materials

摘要

Non-liner finite element code MSC.Marc was utilized to analysis the field of stress of the Al_2O_3 joints brazed with composite filler materials. The material properties of the filler materials were defined by using the mixing law, method of Mori-Tanaka and theory of Eshelby to ensure the accuracy and reliability of FEM results. The results shown stress in brazing bream is more serious than that in base material. The maximal stress can be found in the interface of joint. And the experimental result shown that the shear strength of joints increased from 93.75MPa(A1_2O_3p Ovol. pct) to 135.32MPa(Al_2O_3p 15vol. pct) when composition of titanium was 3wt pct in the filler metal.