대한기계학회:학술대회논문집 (Proceedings of the KSME Conference)
- 대한기계학회 2004년도 추계학술대회
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- Pages.220-225
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- 2004
고평균하중을 고려한 구조응력 기반의 피로균열성장 모델에 관한 연구
A Study on Fatigue Crack Growth Model Considering High Mean Loading Effects Based on Structural Stress
- Kim, Jong-Sung (KOPEC, Structural Integrity & Material Dept.) ;
- Kim, Cheol (KOPEC, Structural Integrity & Material Dept.) ;
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Jin, Tae-Eun
(KOPEC, Structural Integrity & Material Dept.) ;
- Dong, P. (Battelle, Center for Welded Structure Research)
- 발행 : 2004.11.03
초록
The mesh-insensitive structural stress procedure by Dong is modified to apply to the welded joints with local thickness variation and inignorable shear/normal stresses along local discontinuity surface. In order to make use of the structural stress based K solution for fatigue correlation of welded joints, a proper crack growth model needs to be developed. There exist some significant discrepancies in inferring the slope or crack growth exponent in the conventional Paris law regime. Two-stage crack growth model was not considered since its applications are focused upon the fatigue behavior in welded joints in which the load ratio effects are considered negligible. In this paper, a two-stage crack growth law considering high mean loading is proposed and proven to be effective in unifying the so-called anomalous short crack growth data.
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