Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)
- Volume 15 Issue 6
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- Pages.1990-2001
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- 1991
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- 1225-5963(pISSN)
DOI QR Code
The Fatigue Life and Crack Penetration Behavior of High-Strength Steel
고장력강의 피로수명과 균열관톤 거동에 관한 연구
- 남기우 (부산수산대학교 재료공학과)
- Published : 1991.11.01
Abstract
The fatigue life and crack penetration behavior of high strength steel have been studied in detail both experimentally and analytically. The fatigue crack shape of a smooth specimen is almost semicircular, while a specimen with stress concentration becomes semielliptical according to stress concentration shape. The aspect ratio of smooth specimens calculated using the Newman-Raju's formular is smaller than the value obtained from the experiment. On the other hand, the aspect ratio of the stress concentration specimen shows a good agreement with experimental results. It is found that the crack growth behavior on the back surface after the penetration is unique and can be divided into three stages ; rapid growth region, constant growth region and acceleration growth region. By using the K value suggested in this study, the particular crack growth behavior and crack shape can be estimated quantitatively.
본 연구에서는 평활부 및 응력집중부에 표면균열을 갖는 표면균열재의 피로수 명과 균열관통 거동을 검토하고, 그 특성을 해명하였다.
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