Experimental and numerical investigation of crack closure measurements with electrical potential drop technique

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Abstract

Crack closure measurements during fatigue crack propagation using the electrical potential drop (PD) technique is evaluated using a combination of experiments and simulations. From finite element simulations it is shown that variations in the potential drop value over a fatigue cycle can be explained by crack closure and strain induced conductivity changes. It is also demonstrated that closure measurements made with PD are consistent with closure observations made from in situ SEM observations of crack closure. Finally, it was observed that closure measurements made by a compliance-based measuring technique gave a somewhat lower opening load as compared to the PD-measurement.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Materials Engineering
  • Applied Mechanics

Keywords

  • in situ SEM, crack closure, potential drop
Original languageEnglish
Pages (from-to)1059-1068
JournalInternational Journal of Fatigue
Volume28
Issue number9
Publication statusPublished - 2006
Publication categoryResearch
Peer-reviewedYes