대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)
- 제20권6호
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- Pages.1798-1809
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- 1996
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- 1226-4873(pISSN)
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- 2288-5226(eISSN)
DOI QR Code
페라이틱 강 배관내의 원주방향 표면균열 평가를 위한 새로운 Z-Factor의 개발
Development of New Z-Factor for the Evaluation of Circumferential Surface Crack In Ferristic Steel Pipings
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Choi, Yeong-Hwan
(Korea Institute of Nuclear Safely) ;
- Chung, Yeon-Ki (Korea Institute of Nuclear Safely) ;
- Lee, Jeong-Bae (Korea Institute of Nuclear Safely) ;
- WilkowsKi, Gery (Engineering Mrchanics Group, Battelle Memorial Institute, USA)
- 발행 : 1996.06.01
초록
The purpose of this paper is to develop new Z-Factors to evaluate the behavior of circumferential surface crack in ferritic steel piping including base metal and Submerged Arc Weld(SAW) metal in nuclear power plant. The Z-factor is a load multiplier to convert plastic load to elasto-plastic load. However the current Z-Factor is a load multiplier to convert plastic load to elasto-plastic load. However the current Z-Factor gives too conservative results. In this study, a J-estimation method, SC.TNP method, which is based on GE/EPRI expression, is used to develop new Z-Factors. The desirabilities of both the SC.TNP mehtod and the new Z-Factors are examined using the previous experimental results for the circumferential surface crack in ferritic steel pippings. The results are as follows ; (1) The SC.TNP mehtod is good for describing the circumferential surface crack behavior in farritic steel pipings, while the well-known R6 mehtod and DPFAD method give too conservative results. (2) The ASME-Z-Factor method using nwe Z-Factors well predicts the behavior of circumferential surface crack in ferritic steel pipings including base emtal and SAW metal.
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