Dielectric characterization of high-performance spaceflight materials
dc.contributor.advisor | Nicola Bowler | |
dc.contributor.author | Kleppe, Nathan | |
dc.contributor.department | Materials Science and Engineering | |
dc.date | 2018-08-11T08:49:26.000 | |
dc.date.accessioned | 2020-06-30T02:53:58Z | |
dc.date.available | 2020-06-30T02:53:58Z | |
dc.date.copyright | Wed Jan 01 00:00:00 UTC 2014 | |
dc.date.embargo | 2015-07-30 | |
dc.date.issued | 2014-01-01 | |
dc.description.abstract | <p>As commercial space travel increases, the need for reliable structural health monitoring to predict possible weaknesses or failures of structural materials also increases. Monitoring of polymer-based materials may be achieved through the use of dielectric spectroscopy by comparing permittivity or conductivity measurements performed on a sample in use to that of a pristine sample. Changes in these measured values or of the relaxation frequencies, if present, can indicate chemical or physical changes occurring within the material and the possible need for maintenance/replacement. In this work, we established indicative trends that occur in the dielectric spectra during accelerated aging of various high-performance polymeric materials (EVOH, PEEK, PPS, and UHMWPE). Uses for these materials range from electrical insulation and protective coatings to windows and air- or space-craft parts that may be subject to environmental damage over long-term operation. Accelerated thermal aging and ultraviolet/water-spray cyclic aging were performed in order to investigate the degradation of the aforementioned material. The Havriliak-Negami model was used in the analysis of the measured dielectric spectra in order to obtain the characteristic fit parameters from which aging-related trends were identified. With reference to the literature and from measured FTIR spectra, observations were connected to the underlying mechanisms causing the dielectric relaxations.</p> | |
dc.format.mimetype | application/pdf | |
dc.identifier | archive/lib.dr.iastate.edu/etd/14045/ | |
dc.identifier.articleid | 5052 | |
dc.identifier.contextkey | 6199780 | |
dc.identifier.doi | https://doi.org/10.31274/etd-180810-3447 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | etd/14045 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/28232 | |
dc.language.iso | en | |
dc.source.bitstream | archive/lib.dr.iastate.edu/etd/14045/Kleppe_iastate_0097M_14463.pdf|||Fri Jan 14 20:12:43 UTC 2022 | |
dc.subject.disciplines | Engineering | |
dc.subject.disciplines | Mechanics of Materials | |
dc.title | Dielectric characterization of high-performance spaceflight materials | |
dc.type | article | |
dc.type.genre | thesis | |
dspace.entity.type | Publication | |
relation.isOrgUnitOfPublication | bf9f7e3e-25bd-44d3-b49c-ed98372dee5e | |
thesis.degree.level | thesis | |
thesis.degree.name | Master of Science |
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