The effect of subsurface crack opening on the stress intensity factor under cyclic thermal loads

Juha Kuutti, Iikka Virkkunen

Research output: Contribution to journalArticleScientificpeer-review


This study considers surface crack behaviour under periodic thermal loads using weight functions and finite element calculations. A surface and subsurface crack opening mode during the load cycle was observed. The subsurface mode where the crack mouth is closed while the crack tip remains open can be more critical for deeper cracks. Crack face contact is required to obtain the subsurface mode both with finite elements and weight functions. A combination of surface and subsurface weight functions can capture the crack behaviour throughout the load cycle. This behaviour is demonstrated using numerous simulations with periodic thermal loads with different extent and frequency.

Original languageEnglish
Article number106600
JournalEngineering Fracture Mechanics
Publication statusPublished - Sep 2019
MoE publication typeA1 Journal article-refereed



  • Crack closure
  • Stress intensity factor
  • Surface flaw
  • Thermal fatigue
  • Weight function

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