Global ETD Search
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 84 for “"Elastic Behavior"”.
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Exploring anisotropy in rock fluid flow and elastic behavior
… to better represent the initial reservoir flow behavior. Various methods for modeling the change in permeability throughout the reservoir development are then explored. As hydrocarbons are produced and reservoir pressure depletes, the change in stress state induces a change in the reservoir …
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The elastic behavior of polymer chains: theory and simulations
This thesis provides a picture on the thermo-elastic behavior of polymer molecules with biological relevance. In particular, this essay deals with the thermo-elasticity of single polymer molecules subjected to uniform stretching (generated by an applied force) or non-uniform stretching (generated …
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The Elastic Behavior of Plagioclase Feldspar at High Pressure
… minerals. Investigation into the structural behavior of various intermediate plagioclases at pressure has been undertaken with the intent of categorizing the elastic behavior with pressure across the solid solution series and establishing a conceptual model to characterize feldspar …
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Magneto-elastic behavior in hard- and soft-MRE's including demagnetizing effects
This thesis studies the magnetic and mechanical behavior of magnetorheological elastomers (MREs) based on four possible permutations defined along particle alignment (Aligned and Unaligned) and magnetization (Hard- or Soft-magnetic) pairs. These pairs designations yield classes A-H, U-H, A-S and …
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Finite Element Study of the Elastic Behavior of Plane Frames With Filler Walls
Made available in DSpace on 2014-12-10T22:21:47Z (GMT). No. of bitstreams: 1 7212396.pdf: 2882193 bytes, checksum: 5a9d6e6c443f3f7c5a0cf676e7b18824 (MD5) Previous issue date: 1971
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Chemo-elastic behavior of reconstructed Li-ion battery cathode particles with phase transformation: a numerical and analytical investigation
… features and protuberances of the anisotropic-elastic actual morphologies. In some cases, the severity of DIS indicate proneness to particle fragmentation. It is shown that phase-transition-induced stresses detrimentally contribute to abrupt changes in the particle mechanical behavior. The …
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Analysis of a one-dimensional nonlinear mechanical model and its application to the qualitative explanation of the visco-elastic behavior of aluminum from sonic tests
… and for a qualitative analysis of the visco-elastic behavior of this material. Young's modulus of elasticity is determined for aluminum bars with various lengths and cross sections using the resonant frequency (in flexure) of each bar. This property varies linearly with the length to depth …
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Applications of the Optical Method of Caustics to the Study of Viscoelastic Dynamic Fracture and Static Blunt Crack Fronts
… relation, as used in the optical methods of photoelasticity and caustics, are extended to linearly viscoelastic materials. The Maxwell-Neumann relation for the stress-optic constants, which is good for linearly elastic behavior, is replaced by an expression derived from the …
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Large Deflections of Structures With Small Elastic Strains (Nonlinear, Rotations)
A consistent theory for linear elastic behavior in which the strains are small but the displacements and rotations can be large is applied to the bending of a beam by end loads and by its own weight, and to the bending of a long rectangular plate and of a circular plate by uniform pressure. The …
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Some molecular contributions and curing considerations: Physical properties of thermoset network materials
… of, and processing effects on, thermoset network behavior are investigated: (1) processing thick section prepreg epoxy materials, (2) characterization of the contributions to rubbery elastic behavior and (3) improved epoxy resins through lightly cross-linked stiff molecular backbones.
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On the Effect of Hydrogen on the Mechanical Behavior of Beta-C Titanium in Aged Condition
The cyclic stress strain behavior was not affected by hydrogen; the non-linear elastic behavior and the cyclic softening did not change with introduction of hydrogen up to a level of 10.8 at%. The fatigue life was, however, reduced when hydrogen charged samples were tested at low frequency (0.00032 …
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Single-molecule studies of mechanical and helicase-catalyzed disruption of nucleic acid duplexes
… enzymes process them in a variety of ways. The behavior of nucleic acids in response to applied forces and enzymatic activity is therefore necessary for a fundamental understanding of biology. Furthermore, a detailed knowledge of nucleic acids and the enzymes that process them has fueled …
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Length-Scale Effects on Nano-Scale Materials Behavior
… For the first time, we observe strong non-linear elastic behavior for grain sizes below 20 nm. (2) Texture and anelastic effects cannot explain the elastic behavior at the nano-scale and we propose a mechanism based atomic-scale interactions. (3) In-situ TEM tests show that below a transitional …
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Fluid content effect on acoustic impedance and limits of direct detection capability : illustrated on an offshore prospect
… to study the physical properties that affect the elastic behavior of the porous rock. The fluid-contact reflectivity (gas-water, oil-water) can be well estimated based on the brine saturated velocity alone. A comparison between the estimated and observed fluid-contact reflectivities on seismic and …
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Finite difference approach for predicting probabilistic life of a composite cylinder subjected to thermal random loads
… responses inside the cylinder. Given the linear elastic behavior of materials involved, induced stresses and strains are evaluated at the end of each time step of the finite difference scheme. A statistical analysis is then carried out to determine the probability of failure of the propellant and …
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Application of SMA fiber composite as seismic reinforcement for concrete moment resisting frames
… steel bars. However, due to their linear elastic behavior, they are not considered in structures which require ductility and damping characteristics. The use of shape memory alloys (SMAs) with their nonlinear-elastic behavior in the composite could potentially provide solution for this …
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Simulation and experimentation of droplets on micro-patterned surfaces
… was found to exhibit surface tension-dominated elastic behavior. Experimental effort was carried out in combination with simulations. Using a novel technique, synchronized video and force response were obtained for droplets moving on patterned PDMS substrate. Features present in the …
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Molecular weight modulation in polyhydroxybutyrate fermentations
… property that most significantly affects elastic behavior is molecular weight. In an effort to understand how molecular weight is formed in PHB production, kinetic studies of PHB fermentations have been performed using fermentation conditions which allow biomass growth and PHB production …
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