Discussion on modeling of thermal fatigue cracks in numerical simulation based on eddy current signals

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Jing Wang
  • Noritaka Yusa
  • Hongliang Pan
  • Mika Kemppainen
  • Iikka Virkkunen
  • Hidetoshi Hashizume

Research units

  • East China University of Science and Technology
  • Tohoku University
  • Trueflaw Ltd.

Abstract

This study evaluates modeling of thermal fatigue cracks by the finite element method from the view point of eddy current testing. Five artificial thermal fatigue cracks introduced into type 304 stainless steel plates were prepared for the research. Eddy current signals were gathered by a differential type plus point probe and subsequent destructive tests were performed to confirm the true profiles of the cracks. Numerical simulation based on the results of eddy current testing and destructive tests were carried out to show how the thermal fatigue cracks should be modeled in numerical simulations. The results of the numerical simulations revealed that thermal fatigue cracks tend to be much less conductive than stress corrosion cracks if they are assumed to have uniform conductivity inside. The results also imply that taking consideration of magnetization induced by the thermal fatigue process enables eddy current signals to be analyzed more quantitatively.

Details

Original languageEnglish
Pages (from-to)96-101
Number of pages6
JournalNDT & E INTERNATIONAL
Volume55
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

    Research areas

  • Eddy current testing, Finite element method, Numerical modeling, Thermal fatigue crack

ID: 4287601