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Fatigue Life Optimization of Spot Welding Nuggets Considering Vibration Mode of Vehicle Subframe  

Lee, Sang-Beom (국민대학교 기계자동차공학부)
Lee, Hyuk-Jae (한국 MSC)
Publication Information
The Journal of the Acoustical Society of Korea / v.28, no.7, 2009 , pp. 646-652 More about this Journal
Abstract
In this paper, welding pitch optimization technique of vehicle subframe is presented considering the fatigue life of spot welding nuggets. Fatigue life of spot welding nuggets is estimated by using the frequency-domain fatigue analysis technique. The input data, which are used in the fatigue analysis, are obtained by performing the dynamic analysis of vehicle model passing through the Belgian road profile and also the modal frequency response analysis of finite element model of vehicle subframe. According to the fatigue life result obtained from the frequency-domain fatigue analysis, the design points to optimize the weld pitch distance are determined. For obtaining the welding pitch combination to maximize the fatigue life of the spot welding nuggets, 4-factor, 3-level orthogonal array experimental design is used. This study shows that the optimized subframe improves the fatigue life of welding nugget with minimum fatigue life about 65.8 % as compared with the baseline design.
Keywords
Durability analysis; Frequency response analysis; Optimum design; Spot welding; Vibration analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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