Affiliation:
1. Pukyung National University
2. Korea Atomic Energy Research Institute
3. Pukyoung National University
Abstract
In this paper, a series of statistical studies were conducted on creep crack growth behavior of Grade 9Cr-1Mo steel for next generation reactor. Creep crack growth tests were performed on pre-cracked compact tension (CT) specimens under the applied load ranges from 3800 to 5000N at the identical temperature condition of 600oC. The creep crack growth behavior has been analyzed statistically using the empirical equation between crack growth rate da/dt and C* parameter, namely da/dt=B(C*)q. First, the determination methods of B and q obtained from experiments were investigated by the least square fitting method and the mean value method. The probability distribution functions of B and q have been investigated using the normal, log-normal and Weibull distribution. The constant B and q are followed well 2-parameter Weibull. Second, the creep crack growth rate data were generated by Monte-Carlo simulation method assuming the 2-parameter Weibull in B and q parameters. The probability distribution of creep crack growth rate for arbitrary C* parameter values seems to follow well Weibull distribution.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference6 articles.
1. R.P. Wei, D. Masser, H. Liu and D.G. Harlow, Materials Science and Engineering A189 (1994) pp.69-76.
2. J.T. Glinak, D.G. Harlow and T.J. Delph, Engineering Fracture Mechanics 57-1 (1997) pp.25-39.
3. D. G. Harlow and R.P. Wei, Materials Science and Engineering A323 (2002) pp.278-284.
4. K.M. Nikbin, M. yatomi, K. wasmer, G.A. Webster, International Journal of Pressure Vessels and Piping 80(2003) pp.585-595.
5. H. Deschanels, C. Escaravage, J.M. Thiry, N. Le Mat Hamata, D. Colantoni, Engineering Failure Analysis 13 (2006) pp.767-779.