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http://dx.doi.org/10.3795/KSME-A.2011.35.3.251

On the Statistical Properties of the Parameters B and q in Creep Crack Growth Law, da/dt=B(C*)q, in the Case of Mod. 9Cr-1Mo Steel  

Kim, Seon-Jin (Dept. of Mechanical & Automotive Engineering, Pukyong Nat'l Univ.)
Park, Jae-Young (Dept. of Mechanical & Automotive Engineering, Pukyong Nat'l Univ.)
Kim, Woo-Gon (Korea Atomic Energy Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.35, no.3, 2011 , pp. 251-257 More about this Journal
Abstract
This paper deals with the statistical properties of parameters B and q in the creep crack growth rate (CCGR) law, da/dt=B$(C^*)^q$, in Mod. 9Cr-1Mo (ASME Gr.91) steel which is considered a candidate materials for fabricating next generation nuclear reactors. The CCGR data were obtained by creep crack growth (CCG) tests performed on 1/2-inch compact tension (CT) specimens under an applied load of 5000N at a temperature of $600^{\circ}C$. The CCG behavior was analyzed statistically using the empirical equation between CCGR, da/dt and the creep fracture mechanics parameter, $C^*$. The B and q values were determined for each specimen by the least-squares fitting method. The probability distribution functions for B and q were investigated using normal, log-normal, and Weibull distributions. As far as this study is considered, it can be appeared that B and q followed the log-normal and Weibull distributions. Moreover, a strong positive linear correlation was found between B and q.
Keywords
Creep Crack Growth; Creep Crack Growth Rate Law; Probability Distribution Function; Mod. 9Cr-1Mo Steel;
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Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 0
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