Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Study on Bike Frame due to Nonuniform Fatigue Loads

불규칙 피로 하중을 받는 자전거 프레임에 대한 연구

  • Han, Moon-Sik (Department of Mechanical & Automotive Engineering, Keimyung University) ;
  • Cho, Jae-Ung (Department of Mechanical & Automotive Engineering, Kongju National University)
  • 한문식 (계명대학교 기계자동차공학과) ;
  • 조재웅 (공주대학교 기계자동차공학부)
  • Received : 2011.09.22
  • Accepted : 2011.12.12
  • Published : 2012.05.01
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Abstract

In this study, 3 kinds of models about bike frame are simulated with static structural analysis, And fatigue life, damage and durability according to fatigue load are analyzed. A bike frame model with diamond type is compared with another model on the reinforced support with its type. In case of the reinforced support type, maximum equivalent stress or total deformation is shown with 10% or 20% more than the diamond type respectively. At both types of models, the trends of fatigue life and damage at both types are same. 'SAE bracket history' with the severest change of load becomes most unstable but 'Sample history' becomes most stable among the cases of nonuniform fatigue loads. In case of 'Sample history' with the average stress of 0 to -1MPa and the amplitude stress of 0 to 1MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 6 times more than the damage possibility of 'SAE Bracket history' or 'SAE transmission'. In case of the reinforced support type, fatigue life becomes shorter and damage probability becomes larger at the right side installed with support than diamond type. The structural result of this study can be effectively utilized with the design on bike frame by investigating prevention and durability against its damage.

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References

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