MODELING AND EXPERIMENTAL INVESTIGATIONS OF THE SHOCK RESPONSE OF VISCOELASTIC FOAMS

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dc.contributor.advisorBaz, Amren_US
dc.contributor.authorDeigan, Richard Jamesen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2007-09-28T14:55:40Z
dc.date.available2007-09-28T14:55:40Z
dc.date.issued2007-03-22en_US
dc.description.abstractThis thesis presents a new constitutive model for closed-cell foams tailored for compressive shock loads and an experimental investigation of two commercial foam products. The new model requires just two characterization experiments to find material parameters, making it far more convenient than other approaches. A specific form of the hyperelastic free energy function is developed that permits an extension of a three-phase composite theory to finite strain hyperelasticity providing the following advantages: 1) identification of the hyperelastic free energy contributions associated with the gas and material phases, 2) elimination of deviatoric experiments for parameter determination, and 3) proper behavior at the densification limit. A viscoelastic model of the matrix shear modulus is used to introduce rate effects and plasticity. A time-incremental formulation of the constitutive model is developed and implemented using a finite element approach. Model results are compared with data obtained in high strain-rate experiments.en_US
dc.format.extent2885683 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/7141
dc.language.isoen_US
dc.subject.pqcontrolledEngineering, Mechanicalen_US
dc.subject.pqcontrolledEngineering, Materials Scienceen_US
dc.subject.pqcontrolledEngineering, Mechanicalen_US
dc.subject.pquncontrolledClosed-cell foamsen_US
dc.subject.pquncontrolledShock modelingen_US
dc.subject.pquncontrolledConstitutive modelingen_US
dc.subject.pquncontrolledHyperviscoelasticen_US
dc.subject.pquncontrolledSplit Hopkinson Pressure Baren_US
dc.subject.pquncontrolledShock Tubeen_US
dc.titleMODELING AND EXPERIMENTAL INVESTIGATIONS OF THE SHOCK RESPONSE OF VISCOELASTIC FOAMSen_US
dc.typeDissertationen_US

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