Engineering C-integral estimates for generalised creep behaviour and finite element validation

Yun Jae Kim, Jin Su Kim, Nam Su Huh, Young Jin Kim

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


This paper proposes an engineering method to estimate the creep C-integral for realistic creep laws to assess defective components operating at elevated temperatures. The proposed estimation method is mainly for the steady-state C*-integral, but a suggestion is also given for estimating the transient C(t)-integral. The reference stress approach is the basis of the proposed equation, but an enhancement in terms of accuracy is made through the definition of the reference stress. The proposed estimation equations are compared with extensive elastic-creep FE results employing various creep-deformation constitutive laws for six different geometries, including two-dimensional, axi-symmetric and three-dimensional geometries. Overall good agreement between the proposed method and the FE results provides confidence in the use of the proposed method for defect assessments of components at elevated temperatures. Moreover, it is shown that for surface cracks the proposed method can be used to estimate C* at any location along the crack front.

Original languageEnglish
Pages (from-to)427-443
Number of pages17
JournalInternational Journal of Pressure Vessels and Piping
Issue number6
Publication statusPublished - 2002 Jun 6
Externally publishedYes


  • C(t)-integral
  • C*-integral
  • Creep
  • Finite element
  • Reference stress approach

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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