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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 25 for “"induced anisotropy"”.
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A chemoplastic model for alkali-silica expansion : effect of stress-induced anisotropy
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Polycrystal Modeling of Precipitate Effects on the Mechanical Behavior of an Aluminum -Copper Alloy
… storage terms. The phenomenon of precipitation-induced anisotropy was incorporated into the hardening description. Model results were compared to single crystal and polycrystal compression experiments. Accurate simulations were obtained for most of the aging conditions and the correct trends due …
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Magnetic Properties Of Sputter Deposited Fe-based Amorphous Thin Films For Resonator Application
… investigate the magnetic properties, including induced anisotropy and magnetostriction, of the as-deposited and annealed films using an M-H Looper. The chemical composition of the films was characterized using secondary ion mass spectroscopy (SIMS). The physical thickness of the films was …
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Modelling including associated testing of cohesive soil using disturbed state concept
… behavior. Factors such as non-associativeness, induced anisotropy and degradation are included as disturbances with respect to two reference states. One reference state is the intact state where the material is assumed to be associative initially isotropic and hardening isotropically. It is …
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The influence of anisotropy of the microstructure on the overall elastic-plastic response of fibrous metal matrix composites
… with a periodic structure, the influence of anisotropy of individual constituents on the overall response of the material has been investigated. Two classes of fibers are considered: boron (isotropic) and graphite (transversely isotropic). The plastic induced anisotropy in the matrix is …
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Effect of Confinement and Temperature on the Behavior of EPS Geofoam
… <p>Characteristics of inherent and stress induced anisotropy of EPS geofoam was investigated by triaxial tests conducted on pre-stressed EPS geofoam. Induced anisotropy was observed to reduce the modulus significantly.</p> <p>A series of creep tests were performed on different densities of …
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Geomechanics and elastic anisotropy of the Bakken Formation, Williston Basin
… rocks exhibit anisotropic characteristics. Anisotropy is particularly common in many sedimentary rocks, such as shales. Anisotropy is defined as the spatial alignment of mineral grains, layers, fractures and stresses which causes elastic wave velocity and other elastic properties to vary …
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A computational framework for dynamic soil-structure interaction analysis
… and softening, liquefaction, initial and induced anisotropy and that of clay are reproduced with unprecedented accuracy for a model of this simplicity.With regard to the computational framework, a general computational framework is presented based on object-oriented programming for the …
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Seismic reflection moveout for azimuthally anisotropic media
Anisotropy can exist in the subsurface as an intrinsic property, or as an induced property, or as a combination of both. Induced anisotropy can result due to preferred orientation of grains, thin layering, and/or the presence of fractures. In this thesis, we study the reflection moveout for …
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An anisotropic damage model for rock
… stiffness of the 'crack' strain subdomain. Induced anisotropy results from the reduction of components of the initial stiffness tensor in the direction of the positive principal 'crack' strains. Evolution of the damage magnitude is determined by the principle of maximum damage dissipation in …
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Numerical simulation and field verification of inclined piezocone penetration test in cohesive soils
… is performed to analyze the effect of soil anisotropy on the inclined piezocone penetration test in normally consolidated cohesive soils. The piezocone penetration is numerically simulated using the commercial finite element code ABAQUS. The saturated clay is modeled as a two-phase material …
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Mechanics and dynamics of living mammalian cytoplasm
… redistribution of the cytoskeleton. Evidence of induced anisotropy for cells under mechanical stimuli exists however, the role of cytoskeletal restructuring on mechanical anisotropy remains unclear. Moreover, the effect of this restructuring on intracellular dynamics and forces remains elusive. …
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An experimental investigation of the motion of flexible molecules in the liquid state by light scattering
… for the n-alkanes. The time scale and collision induced anisotropy is such that this component is interpreted as being due to interactions between chain ends. The low frequency component is examined for n-alkanes, both pure liquids and solutions in CC1(4), the n-alcohols, both pure liquids and …
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Current-induced torque driven ferromagnetic resonance in magnetic microstructures
… current to induce an oscillating current-induced torque (CIT) on the magnetisation. In the frequency range close to the natural resonance frequency of the magnetic moments (gigahertz), CIT can excite precessional motion of the magnetisation, a process known as ferromagnetic resonance …
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Investigation of Spinel Ferrite Thin Films for Spintronics Applications
… ZnGa₂O₄ substrate shows uniaxial perpendicular anisotropy (Hu⊥ = 0.1 (±0.1) kOe), Gilbert damping parameter equal to αₑff = 9 × 10−⁴ (±7×10−⁵), and very low strain-induced anisotropy (Hσ = 0.4 (±0.1) kOe). It has also been demonstrated that similar improvements are attainable from other members …
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Anisotropic ductile fracture of metal sheets : experimental investigation and constitutive modeling
… in rolled or extruded sheet. Among them, the anisotropy of large strain plastic deformation and ductile fracture under multi-axial loading is highly relevant to various industrial applications such as metal forming, impact failure of structures, etc. In this thesis, a comprehensive study of …
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Time-resolved linear and non-linear rheology of thixotropic and aging complex fluids: Application to particulate and biopolymeric physical gels
… shear rate to gain insight into the shear-induced changes to the viscoelastic properties of a complex fluid. Orthogonal superposition (OSP), in which the two modes of deformation are perpendicular, has been preferred over parallel superposition to avoid non-linear cross-coupling of the …
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Magnetic and Spintronic Properties of Rare-Earth Iron Garnets
… (REIG) can be grown as thin films with strain-induced perpendicular magnetic anisotropy (PMA), and their potential for spintronic device applications has been studied extensively in recent years. In particular, thulium iron garnet (TmIG) has excited great interest due to record-breaking spin …
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Stress- and direction-dependent analysis of elastic and petrophysical properties, and texture in unconventional rocks
In the past decade, the study of geophysical anisotropy has gained increasing attention due to its significance in unconventional rock characterization and production. Anisotropy can be characterized as (a) intrinsic anisotropy, such as thin laminations, clay layers, and organic matter, and (b) …
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