Abstract: Based on the thermal-elastic theory, a thermal and structure stress analysis model of aluminum brazing structure with fin-plate-side bar is established. The coupling method of thermal-structure was used to simulate and analyze the stress distribution of aluminumbrazing structure with fin-plate-side. The results show that the stress concentration of equivalent thermal stress, equivalent structure stress and equivalent stress is generated at the brazed joint of brazing structure, which is mainly caused by the incomplete matching of the material properties of the base metal and the brazed layer at the brazed joint and the discontinuity of the structure at the brazed joint. The distribution of equivalent thermal stress, equivalent structure stress and equivalent stress along typical path are mainly affected by normal stresses. Under the coupling effect of thermal and structure, the equivalent thermal stress has a significant influence on the equivalent stress. Therefore, the selection of thermal boundary is crucial to the simulation results.

Key words: thermal stress, structure stress, equivalent stress, coupling of thermal-structure, finite element method