ECA 기법을 이용한 해양구조물의 결함 평가
Flaw Assessment on an Offshore Structure using Engineering Criticality Analysis
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참고문헌
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초록
Offshore structure may be considerably vulnerable to fatigue failure while initial flaw propagates under cyclic loading, so crack propagation analysis/fracture/yield assessments about initial flaw detected by NDT are necessarily required. In this paper, case studies have been conducted by flaw assessment program using engineering criticality analysis (ECA) approach. Variables such as flaw geometry, flaw size, structure geometry, dynamic stress, static stress, toughness, crack growth rate, stress concentration factor (SCF) affected by weld are considered as analysis conditions. As a result, the safety of structure was examined during fatigue loading life. Also, critical initial flaw size was calculated by sensitivity module in the developed program. The flaw assessments analysis using ECA approach can be very useful in offshore industries owing to the increasing demand on the engineering criticality analysis of potential initial flaws.
Abstract
Offshore structure may be considerably vulnerable to fatigue failure while initial flaw propagates under cyclic loading, so crack propagation analysis/fracture/yield assessments about initial flaw detected by NDT are necessarily required. In this paper, case studies have been conducted by flaw assessment program using engineering criticality analysis (ECA) approach. Variables such as flaw geometry, flaw size, structure geometry, dynamic stress, static stress, toughness, crack growth rate, stress concentration factor (SCF) affected by weld are considered as analysis conditions. As a result, the safety of structure was examined during fatigue loading life. Also, critical initial flaw size was calculated by sensitivity module in the developed program. The flaw assessments analysis using ECA approach can be very useful in offshore industries owing to the increasing demand on the engineering criticality analysis of potential initial flaws.
참고문헌 (7)
- British Standard Institution(BSI), "Guide to methods for assessing the acceptability of flaws in metallic structures", BS7910, ~ (2005)
- Jeon, Y.C., "A Study on Fatigue Life Prediction of Welded Joints through Fatigue Test and Crack Propagation Analysis", Journal of the Society of Naval Architects of Korea, 38(3), pp.93~106 (2001)
- Kim, C.W., "A Study on the Fatigue Crack Propagation Analysis Using Equivalent Stress Distribution", Journal of the Society of Naval Architects of Korea, 39(2), pp.61~68 (2002)
- 김경수, "선체 용접부의 균열진전 및 피로수명 예측에 관한 연구(II)", 대한조선학회 논문집, 45(6), pp.679~687 (2008), 대한조선학회
- Nho, I.S., "Structural Safety Assessment of Independent Spherical LNG tank(2nd report) –Fatigue Crack Propagation Analysis Based on the LBF Theory-.", Transactions of the Society of Naval Architects of Korea, 30(4), pp.74~82 (1993)
- Yim, S.J., "The Integrity Assessment Method of Initially Cracked Structural Component by Reliability Analysis", Transactions of the Society of Naval Architects of Korea, 30(2), pp.161~176 (1993)
- Yoon, K.J, "Engineering critical assessment of material for IMO independent tank Type-B LNG tank structure", The Annual Autumn Conference, pp.800~804 (2013)