Title:
An Energy Based Model for the Compressive Behavior of Goose Down

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dc.contributor.advisor McDowell, David L.
dc.contributor.advisor Jacob, Karl I.
dc.contributor.author Wilde, Timothy Philip en_US
dc.contributor.committeeMember Neu, Richard W.
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2005-03-01T19:40:39Z
dc.date.available 2005-03-01T19:40:39Z
dc.date.issued 2004-12-02 en_US
dc.description.abstract Very little work has been done to study and understand the internal mechanisms that provide goose down with its resiliency under repeated compression. We have employed low magnification optical microscopy to identify some of these important mechanisms. Microscopy showed that a small tertiary structure exists on most goose down fibers and creates an important point of contact when two fibers interact. This tertiary contact mechanism has been coupled with fiber orientation and incorporated into a unique strain-energy function. The principal stresses for an initial compression cycle can be determined from this strain-energy function according to the hyperelastic constitutive theory. Irreversible deformation and hysteresis necessitate another means to determine the stresses during unloading and reloading. For these stages, the framework used by Beatty et al. (2002) for an ideal Mullins material will be utilized in conjunction with a shift in the stress-free state to determine the principal stresses. The proposed model is then evaluated for uniaxial compression and shown to capture the general behavior of goose down in compression including the irreversible deformation and hysteresis. en_US
dc.description.degree M.S. en_US
dc.format.extent 1201620 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/4899
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Hysteresis en_US
dc.subject Goose down
dc.subject Mullins Effect
dc.subject Irreversible deformation
dc.subject Hyperelasticity
dc.subject.lcsh Hysteresis en_US
dc.subject.lcsh Feathers Mechanical properties en_US
dc.title An Energy Based Model for the Compressive Behavior of Goose Down en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor McDowell, David L.
local.contributor.advisor Jacob, Karl I.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
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relation.isAdvisorOfPublication ebd9def1-d8d4-4f60-b2ef-0b4884c74b69
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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