A Study on Durability of Under Bar at Car through Structural and Fatigue Analysis

자동차 언더바의 구조 및 피로해석을 통한 내구성 연구

  • Received : 2014.10.09
  • Accepted : 2015.01.28
  • Published : 2015.04.30


This study investigated the durability of the under bar of a car through structural and fatigue analysis. Model 1 had the lowest value among three kinds of models. In the case of the maximum equivalent stress and displacement at structural analysis, model 1 showed the highest durability. Also, models 3 and 2 showed structural durability in order of this value. In the case of fatigue analysis, the maximum fatigue lives of the three models were equal to $2{\times}10^7$cycles. However, model 1 showed the highest value among the three models, as the minimum fatigue life of model 1 becames 92.56 cycles. Also models 3 and 2 showed fatigue durability in order of this value. The maximum possibility of fatigue damage for models1,2,and 3 became 30%. If the results of this study are applied to change the design shape of the under bar of cars, the ride comfort for automobile passengers and car durability can be improved.


Under bar;Fatigue life;Fatigue damage;Damage possibility;Durability


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