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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 55 for “"heterogeneous materials"”.
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Percolation and homogenization theories for heterogeneous materials
Most materials produced by Nature and by human beings are heterogeneous. They contain domains of different states, structures, compositions, or material phases. How these different domains are distributed in space, or in other words, how they connect to one another, determines their macroscopic …
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Comprehensive Theory of Heat Transfer in Heterogeneous Materials
… equation to model heat transfer in engineering materials. The equation cannot accurately predict temperatures in some applications, such as during transients in microscale (< 10^-12 s) situations. However, even in situations where the time duration is relatively large, the Fourier heat equation …
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Space-Time Multiscale-Multiphysics Homogenization Methods for Heterogeneous Materials
… framework for computational analysis of heterogeneous materials consisting of multiple length scales, multiple time scales and coupled-multiple physics. The research efforts also addresses the technological issues associated with modeling the morphological details of microstructures with …
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Fractals in elastic-plastic transitions of random heterogeneous materials
… to study elastic-plastic transitions in random heterogeneous materials. While it is well known that many materials display fractal characteristics, very little work was done on fractals in elasto-plasticity, and so this study is one of the first attempts in that direction. Fractal patterns have …
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Using Deep Learning to Understand and Design Heterogeneous Materials
The drive to develop materials with superior performance and multifunctional capabilities has underscored the importance of precisely controlling material heterogeneity, establishing it as a pivotal component of materials science and engineering. From a compositional standpoint, the …
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Experimental Investigation of Hyperbolic Heat Transfer in Heterogeneous Materials
… evidence of thermal wave behavior was found in heterogeneous materials. Thus, the overall goal of this study was to experimentally verify those results, and develop a parameter estimation scheme to estimate the thermal properties of various heterogeneous materials. Two types of experiments …
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Heat Transfer During Melting and Solidification in Heterogeneous Materials
A one-dimensional model of a heterogeneous material consisting of a matrix with embedded separated particles is considered, and the melting or solidification of the particles is investigated. The matrix is in imperfect contact with the particles, and the lumped capacity approximation applies to …
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Using current sensing atomic force microscopy to study heterogeneous materials
Two kinds of heterogeneous materials, block copolymer films and Nafion membranes, are studied by using current sensing atomic force microscopy (CSAFM). In the calculated results, correlation between surface morphology and surface conductance images is obtained using CSAFM, and the implication of …
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Simulation and design optimization of wave propagation in heterogeneous materials
Propagation of waves through heterogeneous structured materials has been the focus of considerable research in recent years. These materials consist of quasi periodic geometries combining two or more piecewise homogeneous component media. The interest in these materials stems from the fact that …
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A multiscale framework for the chemomechanical characterization of ancient heterogeneous materials
… even thousands--of years, ancient building materials have survived environmental exposure, modifications, and restorations, often to an extreme degree. These processes, which have occurred from antiquity all the way to the present, have resulted in materials that are poorly understood both …
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Modeling the effect of debonding on the constitutive response of heterogeneous materials
Experimental studies have observed that particulate composite systems experience damage in three principal modes: failure of the interface between particle and binder; tearing of the matrix; and fracture of the particle. Interfacial debonding is often a precursor to the other failure processes and …
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A framework for damage modeling in multi-constituent laminated materials
… heterogeneity across the spacial domain, between materials, and over time. Composite material containing directionally oriented material have become a necessity in the world of structural, mechanical, aerospace, and material engineering design. To account for the thermomechanical curing processes …
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Using narrowband pulse-shaping to characterize polymer structure and dynamics : Deathstar GHz spectroscopy
… dynamics lays the ground for further study of heterogeneous materials, such as nanocomposites and block copolymers.
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A Multigrid Homotopy Method For Computing Eigenfunctions of Differential Operators With Two-Dimensional Heterogeneity
… across the interfaces between two or more heterogeneous materials. Our method involves the combination of the well-known Inverse Iteration with a multigrid homotopy.</p>
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Particle packings and microstructure modeling of energetic materials
… as models of the microstructure of particulate heterogeneous materials. In the first part of this dissertation, we present the current mathematical framework used for understanding the properties of particle packings, as well as the methods and algorithms we have developed to generate packings …
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An efficient three-dimensional database driven approach for multi scale homogenization
… technique used to model structures made of heterogeneous materials. Capable of capturing the microscopic effects at the macro level, the FE2 method assigns a representative volume element (RVE) of the materials microstructure at points across the macroscopic sample. This process results in …
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The effect of the packing density on the indentation hardness of cohesive-frictional porous materials
… and sedimentary rocks in particular are highly heterogeneous materials which defy a straightforward implementation of the materials science paradigm of microstructure-properties-performance correlation. The application of nanoindentation to natural composites has provided the geomechanics …
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