JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Development of New Z-Factor for the Evaluation of Circumferential Surface Crack In Ferristic Steel Pipings
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Development of New Z-Factor for the Evaluation of Circumferential Surface Crack In Ferristic Steel Pipings
Choi, Yeong-Hwan; Chung, Yeon-Ki; Lee, Jeong-Bae; WilkowsKi, Gery;
  PDF(new window)
 Abstract
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.
 Keywords
Circumferential Surface Crack;Ferritic Steel Pipings;ASME Z-Factor Method;Z-Factor;Limit Load Method;
 Language
Korean
 Cited by