Estimation of the transient creep parameter C(t) under combined mechanical and thermal stresses

Tae Kwang Song, Yun Jae Kim, Kamran Nikbin, Robert A. Ainsworth

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

This paper reports finite element analyses for an axially loaded cylinder with three different types of thermal stress. The magnitudes of the thermal and mechanical loadings are varied and creep crack tip parameters are evaluated for part-through-wall and fully penetrating defects with a range of sizes. The relaxation rate for the creep crack tip parameter is examined in detail and is found to depend on the magnitudes of the mechanical and thermal loads and on whether or not there is plasticity on initial loading. Simplified formulae are developed for describing the rate of relaxation by a modified redistribution time.

Original languageEnglish
Pages (from-to)685-704
Number of pages20
JournalEngineering Fracture Mechanics
Volume77
Issue number4
DOIs
Publication statusPublished - 2010 Mar 1
Externally publishedYes

Keywords

  • C(t)-integral
  • Combined mechanical and thermal stresses
  • Finite element analysis
  • Transient creep

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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