Evaluation of the elasto-plastic crack tip singularities via mechano-luminescent effects

Ramesh Basnet, Suman Timilsina, Kwang Ho Lee, Ji Sik Kim

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

New techniques to directly evaluate the plastic singularity of elasto-plastic crack under a mixed mode from the plastic J field, as well as indirectly from an elastic K field, have been suggested using Mechano-luminescence (ML) in SrAl2O4:Eu,Dy. For this purpose, the ML of a plastic core, Hutchinson–Rice–Rosenberg (HRR), field in the vicinity of a physical crack tip during four-point shearing was visualized and analyzed. Plastic stress intensity factors (SIFs) of KMP measured at 829 and 872 N directly from the ML-HRR field showed proper agreement with those of KMPe that were predicted indirectly from elastic SIFs with deviations of less than 11%. An imaginary crack tip within the plastic zone and a propagating angle with the plastic zone size under transient cracking were evaluated separately to verify use of ML technique for considering elasto-plastic crack in Structural Health Monitoring (SHM).

Original languageEnglish
Pages (from-to)127-142
Number of pages16
JournalInternational Journal of Engineering Science
Volume123
DOIs
StatePublished - Feb 2018

Keywords

  • Elasto-plastic crack
  • HRR field
  • Mechano-luminescence
  • Mixed mode
  • Structural health monitoring

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