Vibrothermographic Crack Heating: A Function of Vibration and Crack Size

dc.contributor.author Holland, Stephen
dc.contributor.author Uhl, Christopher
dc.contributor.author Renshaw, Jeremy
dc.contributor.department Aerospace Engineering
dc.date 2018-02-13T03:16:25.000
dc.date.accessioned 2020-06-29T22:44:47Z
dc.date.available 2020-06-29T22:44:47Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2012-11-20
dc.date.issued 2008-07-01
dc.description.abstract <p>Vibrothermography is an inspection technique that detects cracks by observing vibration induced crack heating. Frictional crack heating in a vibrating specimen is directly linked to the resonant vibrational stress on the crack. In simple geometries we can measure the vibrational mode structure and intuit the dynamic vibrational stress field on the crack. This is used to establish a relationship between crack heating and vibration. Such a relationship will be critical for vibrothermography to be accepted as a viable inspection technology. We correlate stress to heating by exciting specimens in a well understood and repeatable resonant vibration mode. Our sample set consists of 65 Titanium and 63 Inconel specimens with low cycle fatigue cracks. Through knowledge of the mode shape, a single point surface velocity measurement is sufficient to calculate the deformed shape of the entire specimen. The loads and stresses within the specimen are calculated from the deformed shape and used to identify the relationship between crack heating and vibration. The observed relationship between normal stress, crack size, and crack heating is presented. This relationship may eventually prove viable for quantifying crack detectability in vibrothermography.</p>
dc.description.comments <p>Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.</p> <p>This article appeared in <em>AIP Conference Proceedings</em>, 1096 (2009): 489–494 and may be found at: <a href="http://link.aip.org/link/doi/10.1063/1.3114294">http://dx.doi.org/10.1063/1.3114294</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/aere_conf/11/
dc.identifier.articleid 1006
dc.identifier.contextkey 3481310
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath aere_conf/11
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1887
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/aere_conf/11/Holland_2009_VibrothermographicCrackHeating.pdf|||Fri Jan 14 18:32:35 UTC 2022
dc.subject.disciplines Aerospace Engineering
dc.subject.keywords crack detection
dc.subject.keywords infrared imaging
dc.subject.keywords nondestructive testing
dc.subject.keywords nondestructive evaluation
dc.title Vibrothermographic Crack Heating: A Function of Vibration and Crack Size
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication dea444ce-079d-483e-8db1-c33100203381
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
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