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dc.contributor.advisor Laursen, Tod A en_US
dc.contributor.author Berry, Jessica Lynn en_US
dc.date.accessioned 2012-01-12T13:37:55Z
dc.date.available 2012-07-10T04:30:03Z
dc.date.issued 2011 en_US
dc.identifier.uri http://hdl.handle.net/10161/5044
dc.description Thesis en_US
dc.description.abstract <p>The purpose of this thesis was to examine progressive composite damage models available within LS-DYNA and to correlate the results of these models with drop weight impact testing and with the non-destructive evaluation techniques of shearography, thermography, and ultrasonic testing. The secondary purpose of this study was to assess whether shearography and thermography provide an adequate less expensive replacement to ultrasonic testing. For this investigation, three models were chosen: Chang-Chang, Chang-Chang + Tsai-Wu, and a Faceted Failure Surface</p><p>Model. For the experimental impact testing, two sets of specimens were chosen: a 16-ply lay-up and a 32-ply lay-up of carbon fiber pre-preg material. The panel specimens were tested at various impact energies and the displacement and force history of the impactor were recorded. The models showed good correlation for the force history with the experiments. Furthermore, the 16-ply models correlated well with the displacement history. However, due the penalty method implementation, the 32-ply models did not show similar peak displacement output. The damage shown by the models was compared to non-destructive evaluation techniques. The shearography and thermography showed significantly less damage than the ultrasonic scans, and therefore do not provide an adequate replacement to ultrasonic scanning. In looking at correlation between the models and the non-destructive evaluation techniques, the faceted failure surface showed significantly more damage due to its elastic-plastic type formulation.</p> en_US
dc.subject Civil engineering en_US
dc.subject Materials Science en_US
dc.subject composite en_US
dc.subject finite element en_US
dc.subject impact damage en_US
dc.subject progressive failure en_US
dc.title Correlation of Finite Element Analysis to Impacted Composite Plates en_US
dc.type Thesis en_US
dc.department Civil and Environmental Engineering en_US
duke.embargo.months 6 en_US

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