Characterization of cracks formed in large flat-on-flat fretting contact

Janne Juoksukangas, Verner Nurmi, Jouko Hintikka, Minnamari Vippola, Arto Lehtovaara, Antti Mäntylä, Joona Vaara, Tero Frondelius

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
19 Downloads (Pure)


Fretting fatigue may lead to severe damage in machines. Adhesive material transfer spots in millimeter scale have previously been observed on fretted surfaces, which have been related to cracking. In this study, fretting-induced cracks formed in a large annular flat-on-flat contact are characterized. Optical and scanning electron microscopy of the fretting scar cross-section samples of self-mated quenched and tempered steel specimens revealed severe cracking and deformed microstructure. Two major cracks typically formed around an adhesion spot, which propagated at an oblique angle, regardless of the test parameters used. Millimeter-scale cracks were observed already within a few thousand loading cycles.

Original languageEnglish
Pages (from-to)361-370
Number of pages10
JournalInternational Journal of Fatigue
Publication statusPublished - Jul 2019
Publication typeA1 Journal article-refereed


  • Crack formation
  • Cracks
  • Damage
  • Fretting fatigue
  • Microscopy

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces


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