Predicting how crack tip residual stresses influence brittle fracture

S. Hadidimoud, A. Mirzaee-Sisan, C.E. Truman, D.J. Smith

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A probability distribution model, based on the local approach to fracture, has been developed and used for estimating cleavage fracture following prior loading (or warm pre-stressing) in two ferritic steels. Although there are many experimental studies it is not clear from these studies whether the generation of local residual stress and/or crack tip blunting as a result of prior loading contribute to the enhancement in toughness. We first identify the Weibull parameters required to match the experimental scatter in lower shelf toughness of the candidate steels. Second we use these parameters in finite element simulations of prior loading on the upper shelf followed by unloading and cooling to lower shelf temperatures to determine the probability of failure. The predictions are consistent with experimental scatter in toughness following WPS and provide a means of determining the relative importance of the crack tip residual stresses and crack tip blunting. We demonstrate that for our steels the crack tip residual stress is the pivotal feature in improving the fracture toughness following WPS. The paper finally discusses these results in the context of the non-uniqueness and the sensitivity of the Weibull parameters.
Original languageEnglish
Pages (from-to)111-115
Number of pages5
JournalAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume434
DOIs
Publication statusPublished - 2002
EventASME 2002 Pressure Vessels and Piping Conference - Vancouver, Canada
Duration: 5 Aug 20029 Aug 2002

Bibliographical note

This paper is not available in Pure.
ISBN: 0-7918-1945-0

Keywords

  • Residual stresses
  • Fracture (Materials)
  • Brittle fracture

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