The Effect of Large Scale Plastic Deformation on Fatigue Crack Length Measurement with the Potential Drop Method
2011 (English)In: Journal of Testing and Evaluation, ISSN 0090-3973, E-ISSN 1945-7553, Vol. 39, no 6, 985-1002 p.Article in journal (Refereed) Published
A combined experimental and numerical investigation was conducted on the effects of plastic deformation and material resistance on the relationship between the potential difference and crack size, denoted calibration curve, or equation. The stainless steel 316L was used at room temperature for investigating the limitations of the calibration curve. The nominal calibration equation, obtained from the undeformed geometry, can be used for fatigue crack length measurements at large plastic deformation. However, the reference potential must, for reliable crack length measurements, be measured at the deformed state and later adjusted at every major change of (plastic) deformation. The major part of the change in reference potential was attributed to the geometry change and only a minor part to the resistivity change. The scatter in the potential drop measured crack length, measured on a cycle by cycle basis, was about 30 times smaller here compared to the compliance measured crack length. Also, in situ potential drop sampling was possible, i.e., the test did not need to be stopped for crack length measurements.
Place, publisher, year, edition, pages
West Conshohocken, PA: American Society for Testing and Materials , 2011. Vol. 39, no 6, 985-1002 p.
potential drop, crack length measurement, fatigue crack growth, large scale yielding, LCF, experiments
Applied Mechanics Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-92242DOI: 10.1520/JTE103532ScopusID: 2-s2.0-84856374861OAI: oai:DiVA.org:kth-92242DiVA: diva2:512908
ProjectsVariable amplitude fatigue crack growth in the low cycle regime
FunderSwedish Radiation Safety Authority
QC 201206282012-03-292012-03-292016-04-27Bibliographically approved