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http://dx.doi.org/10.3795/KSME-A.2012.36.7.759

Method to Determine Elastic Follow-Up Factors to Predict C(t) for Elevated Temperature Structures  

Lee, Kuk-Hee (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Yun-Jae (Dept. of Mechanical Engineering, Korea Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.7, 2012 , pp. 759-768 More about this Journal
Abstract
This paper proposes a method to determine the elastic follow-up factors for the $C(t)$-integral under secondary stress. The rate of creep crack growth for transient creep is correlated with the $C(t)$-integral. Elastic follow-up behavior, which occurs in structures under secondary loading, prevents a relaxation of stress during transient creep. Thus, both the values of $C(t)$ and creep crack growth increase as increasing elastic follow-up. An estimation solution for $C(t)$ was proposed by Ainsworth and Dean based on the reference stress method. To predict the value of $C(t)$ using this solution, an independent method to determine the elastic follow-up factors for cracked bodies is needed. This paper proposed that the elastic follow-up factors for $C(t)$ can be determined by elastic-plastic analyses using the plastic-creep analogy. Finite element analyses were performed to verify this method.
Keywords
Crack; C(t)-Integral; Elastic Follow-up; Secondary Stress; Transient Creep;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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