Sheet aluminum alloys have been used in manufacturing of machine structures. In fatigue crack propagation behavior of thin sheet aluminum alloys, it is important that fatigue crack growth rate is affected by crack closure phenomenon. In this work, we analyzed the characteristics of fatigue crack propagation behavior in experiment of constant stress condition for thin sheet Al 2024-T3 alloys, and identified the retardation behavior of crack growth by comparing experimental results of thin and thick plate specimen. We attempt to operate the fatigue life estimating process using the fatigue related material constants from referred fatigue crack propagation analysis. And we analyzed the experimental and prediction results of fatigue life of thin sheet aluminum alloy in order to identify the relation between retardation behavior of fatigue crack growth and crack closure phenomenon.

Abstract
 1. 서론
 2. 기본 이론
  2.1 피로균열전파거동에 대한 기본개념
  2.2 피로수명예측
  2.3 일정진폭하중하에서의 피로시험
  2.4 피로수명예측과정
 3. 실험결과 및 검토
  3.1 일정진폭하중하에서의 피로균열전파거동
  3.2 두께별 피로균열성장지연거동에 대한 실험결과와 예측결과의 비교
 4. 결론
 참고문헌

• 김승권(인하대학교 대학원 기계공학전공) | S.G. Kim