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 41 for “"Effective Properties"”.
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Effective properties for flow in heterogeneous porous media
… a good characterization of heterogeneity of soil properties. The effects of variabilities of soil properties at local scale on the mean behavior of heterogeneous flows were investigated via Monte Carlo method. Assuming log-normal distribution of conductivity and capillary pressure head being a …
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Effective properties of multiphase flow in heterogeneous porous media
… soil properties. A derivation of the system's effective properties - nonwetting phase moisture content, capillary pressure, normalized saturation and permeability - was developed which is not specific as to the form of the permeability dependence on saturation or capillary pressure. This lack …
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Effective properties of magneto-electro-elastic two-dimensional cellular solids
… to implement field models to determine the effective properties for this cellular solid including elastic, piezoelectric, piezomagnetic, thermal, pyroelectric and pyromagnetic effective properties as a function of the relative density. Results obtained for purely elastic properties were …
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Influence of geometric parameters on 3D periodic lattice effective properties
… to combine the effect of bulk material properties and geometric periodicity. They offer enhanced mechanical and dynamic properties per unit mass, and the ability to engineer the material response by optimizing the unit cell. Characterizing lattice properties through experiments can be a …
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Computational Studies on the Effective Properties of Two-Phase Heterogeneous Media
<p>The effective elastic modulus and conductivity of a two phase material system are investigated computationally using a Monte Carlo scheme. The continuum contains circular, spherical or ellipsoidal inclusions that are either uniformly or randomly embedded in the matrix. The computed results are …
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Numerical analysis of homogenization using random finite element method
… of porosity and void size on the equivalent or effective properties of geomaterials. The effective value is defined as the property that would have led to the same response if the geomaterial had been homogeneous. A random finite element method (RFEM) has been developed involving an ideal block …
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Modeling and Analysis of Advanced Thermoelectric Modules Considering Thermal Losses
… in terms of output power and efficiency. Effective material properties were invoked for understanding the influence of temperature dependence of material parameters and related adverse effects on the model TEG. It is shown that analytical equations with effective properties can capture the …
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Resonance and double negative behavior in metamaterials
… to exhibit frequency dependent double negative effective properties. We develop a rigorous method for calculating the frequency intervals where either double negative or double positive effective properties appear and show how these intervals imply the existence of propagating Bloch waves inside …
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Stochastic analysis of dense nonaqueous phase liquid dissolution in naturally heterogeneous subsurface systems
… approach that treats the variability of flow properties as three-dimensional random fields. A steady-state, quasi-static DNAPL saturation distribution in a source zone is derived, based on the previous research to describe the field-scale nonuniform residual DNAPL distribution. A local-scale …
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ADDITIVELY MANUFACTURED METALLIC CELLULAR STRUCTURES
… with excellent mechanical, thermal, and acoustic properties. They offer promise in a series of applications, including lightweight applications, sandwich cores, mechanical damping, acoustic absorption, strain isolation, and thermal management. The manufacturing of these complex cellular structures …
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Exploring Immersed FEM, Material Design, and Biological Tissue Material Modeling
… parametrization techniques are explored. The effectiveness of the approach is demonstrated through verification and case studies. For material design, the study combines topological shape optimization with IIFEM, providing a computational approach for architecting materials with desired …
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The influence of the microstructural shape on the mechanical behaviour of interpenetrating phase composites
… that the cylindrical model produced greater effective properties than the spherical model at the same volume fraction. The influence of phase shape was connected to the increased contiguity of the superior phase within the IPC for the cylindrical model, which allowed similar levels of …
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Homogenization and elastic-plastic transitions in random and FGM microstructures
… uses homogenization as a tool to estimate the effective properties of heterogeneous materials with varying microstructures. Separation of scales (Micro (d), Meso(δ), Macro (L)), in these microstructures leads to the problem of determination of the Representative Volume Element (RVE) that …
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Nonlinear structural design using multiscale topology optimization
… design parameters to their homogenized properties do not exist in general. Hence, we resort to computational homogenization to compute the macroscopic effective properties. The presence of nonlinearities and the iterative nature of the design process makes the problem computationally …
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Ultrasound : an alternative solution for removing tattoos
… therefore assumed that tattooed cells adopt an "effective density" analogous to the way fat cells develop a lower density. Using this change in mechanical property, the hypothesis is that focused, high frequency ultrasound can target tattooed cells. These cells may be selectively disrupted based …
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Effect of fiber morphology on composite properties
… known to exist in graphite fibers on the effective properties of a composite material was studied using the composite cylinder assemblage model. The cylindrical orthotropy of the fibers was found to have no effect on the properties of a composite with purely orthotropic fibers. For fibers …
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An Improved dipole-moment model based on near-field scanning for characterizing near-field coupling and far-field radiation from an IC
… contribution of the work is the proposal of effective dielectric properties of layered media for cavity model applications. With the effective properties. the cavity model can be generalized for either parallel plates or metal enclosures containing multiple dielectric layers. In the fourth …
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Computational Design of 2D-Mechanical Metamaterials
… are novel materials that display unique properties from their underlying microstructure topology rather than the constituent material they are made from. Their effective properties displayed at macroscale depend on the design of their microstructural topology. In this work, two classes of …
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Isogeometric topology optimization for auxetic metamaterials and structures
… at the conceptual design phase, which can effectively determine the numbers, connectivity and existence of holes in the structural design domain and evolve design elements to improve the concerned performance. General speaking, topology optimization works as an important tool to seek for …
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