Method to determine elastic follow-Up fedict C(t) for elevated temperature structures

Kuk Hee Lee, Yun Jae Kim

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)759-768
Number of pages10
JournalTransactions of the Korean Society of Mechanical Engineers, A
Volume36
Issue number7
DOIs
Publication statusPublished - 2012 Jul
Externally publishedYes

Keywords

  • C(t)-Integral C(t)-integralc(t)
  • Crack
  • Elastic follow-up
  • Secondary stress
  • Transient creep

ASJC Scopus subject areas

  • Mechanical Engineering

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