Investigation of the effect of the roughness-induced crack closure on the fatigue crack propagation behavior of hot-rolled steels under mixed-mode loading conditions

Ki Jeong Seo, Jeong Moo Lee, Byoung Ho Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)


It is reasonable to apply crack closure concepts, i.e. roughness-induced crack closure, to understand the crack propagation behavior under mixed mode loading conditions. In this paper, the characteristics of fatigue crack propagation under mixed-mode loading is studied using the concept of roughness-induced crack closure, and a model of the variation of the crack opening ratio is proposed based on multi-variable statistics. In addition, fracture surfaces are examined by C-scan and classified into four stages to quantify the effect of crack closure. The roughness parameter based on the highest intensity reveals the effect of roughness-induced crack closure on the fatigue crack propagation.

Original languageEnglish
Pages (from-to)264-269
Number of pages6
JournalMaterials Transactions
Issue number2
Publication statusPublished - 2012 Mar 21



  • C-scan
  • Crack opening ratio
  • Fatigue crack
  • Mixed-mode
  • Roughness-induced crack closure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this