Computational and experimental studies of high temperature crack initiation in the presence of residual stress

Noel P. O'Dowd, Kamran M. Nikbin, Robert C. Wimpory, Farid R. Biglari, Manus P. O'Donnell

Research output: Contribution to journalArticlepeer-review

Abstract

Residual stresses have been introduced into a notched compact tension specimen of a 347 weld material by mechanical compression. The required level of compressive load has previously been determined from finite-element studies. The residual stress in the vicinity of the notch root has been measured using neutron diffraction and the results compared with those obtained from finite-element analysis. The effect of stress redistribution due to creep has been examined and it is found that a significant reduction in stress is measured after 1000 h at 650° C. The implications of these results with regard to the development of damage in the specimen due to creep relaxation are examined.

Original languageEnglish
Pages (from-to)414031-414037
Number of pages7
JournalJournal of Pressure Vessel Technology, Transactions of the ASME
Volume130
Issue number4
DOIs
Publication statusPublished - Nov 2008

Keywords

  • Creep crack initiation
  • Fracture
  • High temperature
  • Residual stress

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