Crack length measurement with a potential drop method: a finite element simulation

Research output: Contribution to journalArticle

Abstract

A potential drop method as used for estimations of crack lengths during three-point-bend experiments, is studied. The mechanical stat is calculated using a finite element method. The deformed body obtained is used for a subsequent calculations of the electrostatic state. Calculations are performed for both two- and three-dimensional models. The material is assumed to be elastic, linearly hardening plastic and electrostatically linear. Large deformations are considered. Further, the non-linearity caused by the load, depending on the contract area between the cylinder on which the load is applied and the specimen, is considered. The increased contact area did not influence the mechanical state very much but have a direct impact on the electrostatic state. THe changes in the potential drop recordings due to deformation and electrical current passing through the load cylinder were shown to be considerable. The study explains, at least partly, the experimental observations. A more reliable registration of crack growth initiation is the main outcome of the analysis.

Details

Authors
External organisations
  • Uppsala University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Materials Engineering
Original languageEnglish
Pages (from-to)3025-3220
Number of pages196
JournalInternational Journal for Numerical Methods in Engineering
Volume36
Issue number18
Publication statusPublished - 1993 Jan 1
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes