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 21 for “"Micro-mechanics"”.
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Micro-Mechanics Based Representative Volume Element Modeling Of Heterogeneous Cementitious Materials
… of various constituent phases from digital microstructures. The microstructure is modeled as a micro-scale representative volume element (RVE) in ABAQUS to generate cubes several tens of microns in dimension and subjected to various prescribed deformation modes to generate the effective …
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Modeling and investigation of thermal conductivity of GF nanocomposites by molecular dynamics simulation and micro-mechanics
L'abstract è presente nell'allegato / the abstract is in the attachment
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Progressive damage and failure of unidirectional fiber reinforced laminates under impact loading with composite properties derived from a micro-mechanics approach
Micromechanics theories have been used to develop macro-level constitutive relations for infinitesimal elastoplastic deformations of unidirectional fiber reinforced laminates. The matrix is assumed to be isotropic and deform elasto-plastically and the fibers transversely isotropic and linear …
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Intercellular flow-mediated force relaxation measurement on the three-dimensional multicellular tissue
… explore the related mechanism through a tailored micro-mechanics platform. Firstly, we design and establish a micro-mechanics platform based on the parallel plate compression (PPC) method. We adopt a precise micro-balance as the sensor to detect the force variation of the sample during …
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Fracture Initiation and Propagation in Low Porosity Crystalline Rocks: Implications for Excavation Damage Zone (EDZ) Mechanics
… rock masses have a significant influence on the mechanics and geometry of EDZs, and this research aims to provide a better understanding of these parameters for brittle rocks. This research addresses the short- and long-term in situ behaviour of massive brittle rock masses through …
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Investigations Into the Physical Mechanisms That Facilitate Transformation Hysteresis in Shape Memory Alloys
… using a theoretical approach which combines micro-mechanics and thermodynamics into a thermo-mechanical framework. Models are formulated for the thermal and stress hysteresis based on a thermo-mechanical framework so as to shed light into differential hysteresis magnitudes. Current …
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Nonlinear analysis of laminated composite shells using a micromechanics-based progressive damage model
A micromechanics-based model for progressive failure analysis of laminated composite shell structures has been developed and implemented. The model couples a finite element model for nonlinear analysis of laminated shells with a micro mechanics elasticity solution for predicting failure and …
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The vibro-acoustic modelling and analysis of damage mechanisms in paper
… associated with its production process. The microscopic structure of paper consists of a random mesh of paper fibres connected by hydrogen bonds. This implies the existence of the two damage mechanisms of interest, the failure of a fibre/fibre bond and the failure of a fibre. The majority of …
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An experimental and theoretical study on the effect of strain rate on ductile damage
… resolve . One approach is to avoid modelling the micro-mechanics of ductile fracture by describing the macroscopic effects of fracture using damage parameters. Damage in metals can be defined as a measure of discontinuous deformation of a body. Many numerical models include some measure of damage …
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Design of Superelastic Secondary-Phase-Toughened Alloys
… elasto-plastic phase. In particular, nano- and micro-scale precipitates, lamellar structures, and bulk matrix morphologies of TiNi are investigated in combination with stable (V,Nb)-Ti matrix phases. These structures allow the study of phase stability as a function of morphology, size, and …
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Optimization of optical computed tomography techniques for the synthesis of particle aggregate models
… mixtures is important for understanding the micro-mechanics of granular materials. Also, numerical synthesis of 3-D particle shapes from their corresponding shape descriptors is required for developing discrete element models (DEMs) that can be used to predict particle contact-forces, and …
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Numerical Investigation of Cleavage Fracture in Welded Connections of Steel Moment Resistant Frames
"This study applies an advanced micro-mechanics model of cleavage fracture in ferritic steels to examine the behavior of welded, moment resistant steel frames of the type widely constructed prior to the 1994 Northridge earthquake. The Weibull stress model for cleavage, coupled with 3-D analyses of …
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Modeling the Residual Strength Distribution of Structural GFRP Composite Materials Subjected to Constant and Variable Amplitude Tension-Tension Fatigue Loading
… tests. A future approach toward more detailed micro-mechanics fatigue damage modeling is suggested to enable better modeling of residual strength of laminates subjected to random loading fatigue.
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Micromechanical study of two-phase flow during air sparging
… are not well understood. In this research, the micro-mechanics of air sparging are studied in order to understand the physical processes of air migration and air spatial occurring on the pore scale during air sparging. First, the void space in the porous medium is characterized by pore network …
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Structure-property relationships in an Al matrix Ca nanofilamentary composite conductor with potential application in high-voltage power transmission
… conductivity of the composite are related to its microstructure in the hope that a conducting material with light weight, high strength, and high electrical conductivity can be developed to produce overhead high-voltage power transmission cables. The current power transmission cables (e.g., …
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Reliability based design methodology incorporating residual strength prediction of structural fiber reinforced polymer composites under stochastic variable amplitude fatigue loading
… of empirical data and evaluation of the micro-mechanics deterioration and failure phenomena of FRP composites under fatigue loading, a new residual strength model for the tension and compression under any load history was proposed. Then this model was implemented in a stochastic framework …
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Using otoacoustic emissions to evaluate efferent auditory function in humans
… loop which aids in the regulation of cochlear micro-mechanics. The ability to measure the response of the MOC system in humans may provide significant insight into unique cochlear functions, such as its sharp frequency selectivity and wide dynamic range. In humans the efferent system can be …
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Multi-scale multiphase modelling of granular flows
… granular solids and water. Understanding the mechanics of granular flow is of particular importance in predicting the run-out behaviour of debris flows. The dynamics of a homogeneous granular flow involve three distinct scales: the microscopic scale, the meso-scale, and the macroscopic scale. …
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Deep ocean clay crusts: behaviour and biological origin
… of the crust material in relation to interface micro-mechanics. A microbiological investigation of crust material by extracting bacteria DNA from clay samples is described, and identifies the presence of the bacterium, Marinobacter aquaeolei. This bacterium is then used to inoculate sterile …
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Auslegung, Simulation und Fertigung eines elektrostatisch betriebenen, selbstjustierenden, optischen 1x2 Multiplexers
Die Dissertation behandelt die Auslegung und Fertigung eines elektrostatisch betriebenen Faserschalters (Multiplexers). Schwerpunkt der Arbeit ist die detaillierte Betrachtung der Kopplung zwischen optischer, elektrischer und mechanischer Domäne. Abgeschlossen wird die Arbeit durch die …
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