Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Fatigue Related Equation with Shape and Loading Factors Representing Effect of Thickness in Al 2024-T3 Alloy Sheet

판재 Al 2024-T3 합금재료의 두께효과를 나타내는 형상인자 및 하중인자에 의한 피로관계식

  • Kim, Seung-Gwon (Department of Mechanical Engineering, Graduate School, Inha University) ;
  • Lee, Ouk-Sub (Division of Mechanical Engineering, Inha University) ;
  • Jang, Joo-Sup (Department of Mechanical & Automotive Engineering, Kyungwon University)
  • 김승권 (인하대학교 대학원 기계공학전공) ;
  • 이억섭 (인하대학교 기계공학부) ;
  • 장주섭 (경원대학교 기계자동차공학과)
  • Received : 2011.05.18
  • Accepted : 2011.07.29
  • Published : 2012.01.01
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Abstract

Aluminum alloys have been used with various thicknesses suitable for light weight of structure. It is known that the thickness effect of material is an important factor affecting fatigue crack propagation under constant fatigue stress condition. In this work, we presented the behavior of fatigue crack propagation in thin plate compared to thick plate Al 2024-T3 alloy with referred thickness effect in a correlative equation determined by the shape factor and the loading factor. We chose two factors that are used in the correlative equation with considering that the experiments were carried out under a constant fatigue stress condition. The thickness ratio of thin plate compared to thick plate and the equivalent effective stress intensity factor ratio depending on thickness were chosen as shape and loading factors. A correlative equation is utilized to determine the equivalent effective stress intensity factor range of thin plate and identify the degree of increasing phenomenon of fatigue life in thin plate compared to thick plate.

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References

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