Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Inherent Damage Zone Model for fatigue Strength Evaluation of Cracks and Notches

영역피해모델에 의한 균열 및 노치의 피로강도평가

  • Kim Won-Beom (Research Institute of Industrial Technology, Pusan National University) ;
  • Paik Jeom-Kee (Naval Architecture & Ocean Engineering, Pusan National University) ;
  • Fujimoto Yukio (Dept. of Engineering Systems, Hiroshima University)
  • 김원범 (부산대학교 생산기술연구소) ;
  • 백점기 (부산대학교 공과대학 조선해양공학과) ;
  • 승본유기부 (히로시마대학 선박해양공학과)
  • Published : 2006.08.01
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Abstract

Inherent damage zone model is presented to explain the fatigue properties near the fatigue limit and the crack growth threshold consistently Inherent damage zone model assumes that the stress at a point which is located at a small distance, $r_0$, an inherent length of the material that represents the size of effective damage zone, from the crack initiation position governs the fatigue characteristics regardless of the geometric configuration of the specimen; smooth specimen, notched specimen or cracked specimens with short and long crack length. A special feature of the paper is using the exact stress distributions of notched and cracked specimens at the strength evaluations. Analytical elastic solutions by Neuber and Westergaard are employed for this purpose Relationship between fatigue limit of smooth specimen and threshold stress of cracked specimen, occurrence condition of non-propagating crack at the root of elliptic notch and circular hole and relationship between stress concentration factor and fatigue notch factor are discussed quantitatively based on the proposed model.

Keywords

References

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