关键词: 翘曲缺陷, 翘曲因子, 平均应力强度因子, 模块化焊点模型

Abstract: Welding of car body might easily cause warping defects, which significantly affected the fatigue life. Aiming at influences of warping defects on the average stress intensity factor, solder joint model was modularized based on mechanics theory and finite element method. Qualified solder joints average stress intensity factor ΔKqua obtained by simulation and warping defect solder joints average stress intensity factor ΔKdef obtained by simulation were compared and analyzed. By looking for influence factors and influence rules, the definition of warping factor was proposed, and the applicability was verified through simulation. The average errors between the average stress intensity factors obtained by simulation analysis and theoretical derivation are less than 6%. Experiments show that the average accuracy of the warping defect solder joint ΔKdef corrected by warping factor is as 84.6%.

Key words: warping defect, warping factor, average stress intensity factor, modular solder joint mode