A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar


A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar

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dc.contributor.advisor Fahrenthold, Eric P.
dc.creator Rabb, Robert James, 1966-
dc.date.accessioned 2008-08-28T23:37:45Z
dc.date.available 2008-08-28T23:37:45Z
dc.date.created 2007
dc.date.issued 2008-08-28T23:37:45Z
dc.identifier.uri http://hdl.handle.net/2152/3268
dc.description.abstract Advanced impact protection systems can experience serious damage due to contact with projectiles such as fragments or entire fan blades. To prevent catastrophic damage of such systems will require sophisticated materials and complex designs. The development of advanced ballistic protection systems will place increased emphasis on the use of composite materials and on numerical simulations to assess these new systems due to the cost and limitations of testing facilities and the increased capability of computing power. Example applications include the design of body armor for the protection of personnel, the design of fragment containment systems for aircraft engines, and the design of orbital debris shielding for the protection of manned spacecraft. The current research has developed a new mesomechanical particle-element material model for woven material impact response, a velocity dependent friction model to simulate yarn interactions, and a strain rate dependent model for Kevlar. In recent research, a new class of shear-thickening fluid (STF) composites has been developed for use in impact protection systems. Advancements in the current work include a Bingham shear stress model for STF effects and a new mixture equation of state for the STF Kevlar that captures the thermodynamic properties of the constituents. The numerical methods and material model developed in this research have been validated through the simulation of three dimensional impact experiments on different Kevlar target geometries. This dissertation also provides new data for fragment simulating projectile impacts on Kevlar with different boundary conditions and new data for aluminum cylinder and steel disk projectile impacts on neat and STF Kevlar with different boundary conditions.
dc.format.medium electronic
dc.language.iso eng
dc.rights Copyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.
dc.subject.lcsh Polyphenyleneterephthalamide
dc.subject.lcsh Aeronautics--Materials
dc.subject.lcsh Body armor
dc.title A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar
dc.description.department Mechanical Engineering
dc.identifier.oclc 174145057
dc.identifier.recnum b68896414
dc.type.genre Thesis
dc.type.material text
thesis.degree.department Mechanical Engineering
thesis.degree.discipline Mechanical Engineering.
thesis.degree.grantor The University of Texas at Austin
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy

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