低温条件下铝制翅片-隔板-封条钎焊结构的应力特性的数值模拟

基于热-弹性理论,建立了铝制翅片-隔板-封条钎焊结构的热结构应力分析模型.采用热-结构耦合的方法,模拟分析了铝制翅片-隔板-封条钎焊结构的应力分布.结果表明,等效热应力、等效结构应力和等效应力均在钎焊结构的钎焊接头处产生应力集中,这主要是由于钎焊接头处母材和钎焊层材料性能的不完全匹配和钎焊接头处的结构具有不连续性造成的.等效热应力、等效结构应力和等效应力沿典型路径在钎焊接头处的分布主要受正应力的影响.在热-结构耦合作用下,等效应力主要受等效热应力的影响.因此,热边界的选取对模拟结果的影响是非常重要的.

Numerical simulation of stress characteristics of aluminum fin-plate-side bar brazing structure under low temperature

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.