The use of SE(T) specimen fracture toughness for FFS assessment of defects in low constraint conditions

J. J. Han, N. O. Larrosa, R. A. Ainsworth, Yun Jae Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Due to the loss of constraint, shallow cracked specimens can 'absorb' more energy than deeply cracked specimens commonly used to define the critical value to fracture and therefore exhibit a higher fracture toughness. The increase in energy absorption allows a reduction in the inherent conservatism when assessing components in low constraint conditions. This study addresses the benefit of using shallow cracked SE(T) fracture toughness specimens in fitness for service (FFS) assessment of defects under low constraint conditions, e.g. blunt defects or shallow cracks. Tearing resistance curves (J-R curves) have been constructed by means of a virtual test framework to determine crack initiation and propagation for shallow cracked SE(T) specimens and parametric notched C(T) specimens. The effect of constraint level on J-R curves is compared. It is observed that most of the blunted C(T) specimens analysed exhibit the same or a lower toughness value than that of a shallow cracked SE(T) specimen. The results are used to show how reduced conservatism can be made in defect assessment of blunt defects or in cases in which reduced constraint conditions can be demonstrated.

Original languageEnglish
Pages (from-to)1724-1737
Number of pages14
JournalProcedia Structural Integrity
Volume2
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • Apparent fracture toughness
  • Blunt defects
  • Constraint effect
  • J-R curves
  • Shallow defects
  • Stress-modified fracture strain model
  • Structural integrity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

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