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dc.contributor.advisorLuhrs, Claudia
dc.contributor.advisorPhilips, Jonathan
dc.contributor.authorDaskam, D. Chris
dc.dateDec-13
dc.date.accessioned2014-02-18T23:38:49Z
dc.date.available2014-02-18T23:38:49Z
dc.date.issued2013-12
dc.identifier.urihttp://hdl.handle.net/10945/38914
dc.descriptionApproved for public release; distribution is unlimited.en_US
dc.description.abstractConcomitant mechanical and electrical testing of carbon nanofiber foam samples, generated using the constrained formation of fibrous nanostructures process reveal the material to be a unique ultra-low-density foam with electrical properties appropriate for application as strain gauge. Samples of CFF, essentially a solid mat of intertwined nanofibers of pure carbon, were grown in a steel mold at ~550 Celsius (C) from a variety of catalysts exposed to fuel rich mixtures of ethylene and oxygen. Only those created from palladium (Pd) particle catalysts were found to produce macroscopic objects sufficiently robust for static and dynamic stress/strain tests. Transient and dynamic tests were used to fully characterize the mechanical properties of the novel foam. These tests clearly demonstrated that the material generated from Pd particles has viscoelastic behavior. The foam was subjected to compression cycles over diverse periods of time employing a die to maintain a fixed cross sectional area. The ultralow density material has a modulus of ~3.5 MPa, close to the one encountered in rubber-like substances. Given its carbonaceous nature, the new foam maintains its thermal stability up to 550 C in air. Simultaneous resistance/stress/strain measurements showed that there is a linear relationship between electrical resistance and strain that is remarkably consistent over many cycles. The novel ultralow density foam has many potential applications including sensing element of a strain gauge or energy absorber.en_US
dc.description.urihttp://archive.org/details/mechanicalndelec1094538914
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.titleMechanical and electrical characterization of novel carbon nano fiber ultralow density foamen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.subject.authorCarbonen_US
dc.subject.authorfiberen_US
dc.subject.authorcarbon nanofiberen_US
dc.subject.authorviscoelasticen_US
dc.subject.authorstrain gaugeen_US
dc.subject.authorgauge factoren_US
dc.subject.authorultra-low-density foamen_US
dc.subject.authorrelaxation modulusen_US
dc.subject.authorand creep compliance.en_US
dc.description.serviceLieutenant Commander, United States Navyen_US
etd.thesisdegree.nameMechanical Engineer And Master of Science InMechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical and Aerospace Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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