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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 62 for “"elastic response"”.
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The Elastic Response of Spherical Shells to Blast Waves
Made available in DSpace on 2014-12-08T23:56:16Z (GMT). No. of bitstreams: 1 6503607.pdf: 4168969 bytes, checksum: 576f7a5f8b5f84c7da4e77c81672d760 (MD5) Previous issue date: 1964
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Elastic Response of Acoustic Coating on Fluid-Loaded Rib-Stiffened Cylindrical Shells
… this work develops an analytical model of an elastic cylindrical shell featuring periodically spaced ring stiffeners with an acoustic coating applied to the outer surface. There is an external fluid environment. Beginning with the equations of elasticity for a solid, spatial-domain …
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Material Characterization of Insect Tracheal Tubes
… tissue which revealed a nonlinear stress-strain response even under small deformations. A detailed analysis of the tissue's microstructural arrangement using both light and electron mi- croscopy revealed the primary sources of reinforcement for the tissue as well as heterogeneity on the …
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Vortex Lattices in Rapidly Rotating Bose -Einstein Condensates: Modes, Elasticity, and Melting
"We approach the static elasticity of a vortex lattice using the elastohydrodyamic approach. We derive the elastic Green's function for the vortex lattice, and connect it to the lattice distortion in an inhomogeneous condensate. We find that the longitudinal elastic response of a vortex lattice is …
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Effects of particle shape and flexibility on suspension dynamics
… method to determine the magnitude of the elastic response of concentrated nano-star suspensions. We find that the linear elastic response for bent and branched particles increases proportional to the concentration cubed whereas for rods it increases only linearly. The non-linear response …
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Modeling of textile based composite materials
… element based model for interrogation of the elastic and progressive failure response of textile based composite materials has been developed and implemented. The geometrically thorough textile geometry model is used as the basis for creation of the geometry used for the finite element …
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Fabrication of nanostructured surfaces with well-defined chemistry using particle lithography
… were developed for mapping magnetic domains and elastic compliance at size regimes below 100 nm. The AFM-based imaging mode is referred to as magnetic sample modulation (MSM). The AFM tip serves as a force and motion sensor for mapping the vibrational response of magnetic nanomaterials. The …
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Design and development of a composite automotive anti-roll bar
An analytical elasticity model is developed for laminated cylindrically anisotropic cylinders subjected to extension, bending, pressure, torsion, and transverse shearing. The model predicts the elastic response of thin or thick walled tubes as well as cylinders, and accounts for all elastic …
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Development of lightweight FRP bridge deck designs and evaluations
… Testing was performed to determine both the elastic and failure response at the component level and the elastic response at the system level. Theoretical correlation of stiffness was made via approximate classical lamination theory, and maximum transverse load distribution factors were …
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Experimental investigations of the pretransition behavior near the nematic-smectic A phase transition
… resolution and yield critical exponents for the elastic constants and the twist viscosity coefficient. These results are inconsistent with the three proposed theories of the critical behavior at least in the simple form in which the theories were first proposed and suggest that further …
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Iterative and variational homogenization methods for filled elastomers
… to undergo large reversible deformation in response to a variety of stimuli (e.g., mechanical forces, electric and magnetic fields, changes in temperature). Modern advances in organic materials science have revealed that elastomeric composites hold also tremendous potential to enable new …
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Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries
… of these nascent cracks leads to non-linear elastic response of the material. These non-linearities can be detected from harmonic generation for propagating elastic waves. The long term goal of this study is to investigate the non-linear elastic propagation in parts with complex geometry. …
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Mechanical response of unidirectional Boron/Aluminum under combined loading
… test methods were employed to characterize the response of unidirectional Boron/Aluminum metal matrix composite material under monotonic and cyclic loading conditions, namely: Iosipescu Shear, Off-Axis Tension and Compression. The characterization of the elastic and plastic response includes the …
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Deformation and fracture of polycarbonate and rubber-modified polycarbonate under controlled temperature, deformation rate, and notch stress triaxiality
… compression is found to exhibit an initially elastic response followed by yield, then strain softening and strain hardening at large strains. The yield stress is found to be dependent on temperature and strain rate. Yield stress is shown to increase with increasing strain rate and decrease …
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Three-dimensional finite element modeling as a tool for flexible pavement design and analysis
… of the individual soil and also the response of the pavement structure.</p> <p>The dynamic analysis which modeled the aircraft landing gear determined that pavements with less than 30 inches of pavement structure over the subgrade will result in high levels of stress on the subgrade …
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Development of a co-dispersion binder for the three-dimensional printing process to facilitate handling of ceramic casting shells in the green state
… at 900°C. A simple model for warping, based on elastic response of a plate to free thermal strain, predicts that flat plates tend to warp into a paraboloid after firing. The experimental results correlated well with this prediction.
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Atomistic simulations of elastic-plastic deformation of amorphous polymers
… simulations. Understanding of the molecular response will aid the development of physics-based continuum level models for these materials. A polyethylene-like molecular network was numerically constructed using a Monte Carlo algorithm and then subjected to uniaxial deformation over a wide …
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A continuum model for needlepunched nonwoven fabrics
… chemical processes. In general, the mechanical response of nonwoven fabrics exhibits two major characteristics. First, the mechanical response can vary significantly when the fabric is loaded along different directions, depending on the existence of a preferential orientation in the fiber …
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Performance based wind design and optimization of tall buildings considering the nonlinearity in building response
… of PBWD, most of these studies focus on the elastic response of the structures. However, understanding the post-elastic response of structures under wind loads is critical to the PBWD. This dissertation is written based on identifying the requirement for improved nonlinear modeling techniques …
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Time dependence of nonlinear flow dynamics of near hard sphere suspensions
… where suspension mechanics is dominated by an elastic response, the nonlinear responses occur when deformation exceeds a characteristic strain. This strain is associated with the transient confinement of particles by nearest neighbors and its volume fraction dependence is through cage …
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