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논문 기본 정보

자료유형
학술저널
저자정보
Weon-Gu Lee (DS Mirae-tech) Kyoung-Hee Gu (Pukyong National University) Cheol-Su Kim (Pukyong National University) Ki-Woo Nam (Pukyong National University)
저널정보
한국해양공학회 한국해양공학회지 한국해양공학회지 제35권 제5호(통권 제162호)
발행연도
2021.10
수록면
327 - 335 (9page)

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Microcracks can rapidly grow and develop in high-strength steels used in offshore structures. It is important to render these microcracks harmless to ensure the safety and reliability of offshore structures. Here, the dependence of the aspect ratio (As) of the maximum depth of harmless crack (α<SUB>hlm</SUB>) was evaluated under three different conditions considering the threshold stress intensity factor (△K<SUB>th</SUB>) and residual stress of offshore structural steel F690. The threshold stress intensity factor and fatigue limit of fatigue crack propagation, dependent on crack dimensions, were evaluated using Ando"s equation, which considers the plastic behavior of fatigue and the stress ratio. α<SUB>hlm</SUB> by peening was analyzed using the relationship between △K<SUB>th</SUB> obtained by Ando"s equation and △K<SUB>th</SUB> obtained by the sum of applied stress and residual stress. The plate specimen had a width 2W = 12 mm and thickness t = 20 mm, and four value of As were considered: 1.0, 0.6, 0.3, and 0.1. The α<SUB>hlm</SUB> was larger as the compressive residual stress distribution increased. Additionally, an increase in the values of As and △K<SUB>th(l)</SUB> led to a larger α<SUB>hlm</SUB>. With a safety factor (N ) of 2.0, the long-term safety and reliability of structures constructed using F690 can be secured with needle peening. It is necessary to apply a more sensitive non-destructive inspection technique as a non-destructive inspection method for crack detection could not be used to observe fatigue cracks that reduced the fatigue limit of smooth specimens by 50% in the three types of residual stresses considered. The usefulness of non-destructive inspection and non-damaging techniques was reviewed based on the relationship between α<SUB>hlm</SUB> , α<SUB>NDI</SUB> (minimum crack depth detectable in non-destructive inspection), α<SUB>crN</SUB> (crack depth that reduces the fatigue limit to 1/N ), and As.
#Nondamaging technology #Shot peening #Compressive residual stress #Offshore structural steel #Reliability

목차

ABSTRACT
1. Introduction
2. Materials and Experimental Methods
3. Results and Discussion
4. Conclusion
References

참고문헌 (28)

참고문헌 신청
Al-Hassani, S.T.S. (1982). The Shot Peening of Metals — Mechanics and Structures. SAE Transactions, 91(4), 4513–4525. Retrieved July 27, 2021, from http://www.jstor.org/stable/44634444 google schola Al-Obaid, Y.F. (1990). A Rudimentary Analysis of Improving Fatigue Life of Metals by Shot-Peening. Journal of Applied Mechanics, 57(2), 307–312. https://doi.org/10.1115/1.2891990 google schola Ando, K., Fueki, R., Nam, K.W., Matsui, K., & Takahashi, K. (2019). A Study on the Unification of the Threshold Stress Itensity Factor for Micro Crack Growth. Transactions of Japan Society for Spring Engineers, 2019(64), 39–44. https://doi.org/10.5346/trbane.2019.39 google schola Ando, K., Nam, K.W., Kim, M.H., Ishii, T., & Takahashi, K. (2020). Analysis of Peculiar Fatigue Fracture Behavior of Shot Peened Steels Focusing on Threshold Stress Intensity Factor Range. Transactions of Japan Society for Spring Engineers, 2020(65), 35–41. https://doi.org/10.5346/trbane.2020.35 google schola Ando, K., Kim, M.H., & Nam, K.W. (2021). Analysis on Peculiar Fatigue Fracture Behavior of Shot Peened Metal Using New Threshold Stress Intensity Range Equation. Fatigue & Fracture of Engineering Materials & Structures, 44(2), 306–316. https://doi.org/10.1111/ffe.13356 google schola

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