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http://dx.doi.org/10.3365/KJMM.2010.48.09.791

Estimation for the Distribution of Creep Crack Growth Coefficients by Probabilistic Assessment  

Lee, Sang-Ho (Division of Information Statistics, Kangnung National University)
Yoon, Kee-Bong (Mechanical Engineering, Chung-Ang University)
Choe, Byung-Hak (Department of Metal & Materials Engineering, Kangnung National University)
Min, Doo-Sik (Department of Metal & Materials Engineering, Kangnung National University)
Ahn, Jong Seok (Korea East-West Power Co. LTD)
Lee, Gil Jae (Korea East-West Power Co. LTD)
Kim, Sun-Hwa (Advansed Metal & Materials Engineering, Soonchunhyang University)
Publication Information
Korean Journal of Metals and Materials / v.48, no.9, 2010 , pp. 791-797 More about this Journal
Abstract
The creep crack growth rate (da/dt) of the Cr-Mo steels tested by pre-crack and the voltage (or resistance) variables were related into fracture parameter (Ct), crack growth coefficient (H), and an exponent (q) in the parts of Base, weld and HAZ. The fracture parameter (Ct) has various variables relating to the specimen and crack shape, applied stress, and creep strain curve. The H and q was inferred by OLS regression (ordinary least square method), and the H values were solved in statistics and probability assessment, which were attained fromPDF's distributions (probability density function). The HAZ part has the highest value of q by OLS regression and the widest distribution of H by PDF of WEIBULL, which means that the crack sensitivity of HAZ should be cautioned against the creep crack growth and failure.
Keywords
metals; hot working; creep; probabilistic assessment;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 0
연도 인용수 순위
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