Coupled Finite Element and Cellular Automata Methods for Analysis of Composite Structures in an Acoustic Domain

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dc.contributor.advisorKwon, Young W.
dc.contributor.authorCraugh, Linda E.
dc.contributor.departmentMechanical Engineering
dc.dateSep-12
dc.date.accessioned2012-11-14T00:02:25Z
dc.date.available2012-11-14T00:02:25Z
dc.date.issued2012-09
dc.description.abstractThis study examines various computational techniques to analyze dynamic response and failure of sandwich composite materials subject to fluid-structure interaction characterized by an acoustic field or the propagation of velocity potential according to the wave equation. A displacement-only plate finite element is developed and implemented using Discontinuous Galerkin (DG) methodology; its accuracy compares favorably to both theory and Continuous Galerkin methods. Several approaches to analyzing debonding failure between skin and core layers of sandwich com-posite structures are demonstrated and evaluated; partial disconnection between neighboring elements at a debonding site shows good qualitative agreement with known physical phenomena. A hybrid Finite Element-Cellular Automata (FE+CA) approach to modeling an acoustic field with non-reflecting boundary conditions is presented, validated nu-merically, and favorably compared with experimental results. The FE+CA fluid model is then combined with the DG structural model to simulate fluid-structure interaction; this combined model compared favorably with experimental results for the strain field of laminated plates subject to low-velocity impact. Each technique addressed shows promise for flexible and accurate modeling of failure initiation and propagation in sandwich and laminate composites subject to fluid-structure interaction with moderate computational costs.en_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.
dc.description.serviceCommander, United States Navyen_US
dc.description.urihttp://archive.org/details/coupledfiniteele1094517347
dc.identifier.urihttps://hdl.handle.net/10945/17347
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.subject.authorDiscontinuous Galerkinen_US
dc.subject.authorsandwich compositesen_US
dc.subject.authorCellular Automataen_US
dc.subject.authorfluid-structure interactionen_US
dc.subject.authorfailureen_US
dc.subject.authordelaminationen_US
dc.subject.authordebondingen_US
dc.subject.authorfinite differenceen_US
dc.titleCoupled Finite Element and Cellular Automata Methods for Analysis of Composite Structures in an Acoustic Domainen_US
dc.typeThesisen_US
dspace.entity.typePublication
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.levelDoctoralen_US
etd.thesisdegree.nameDoctor of Philosophy In Mechanical Engineeringen_US
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