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 24 for “"Rule of mixtures"”.
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Deformation Behaviour of NiCo Multilayers with Modulated Microstructures
… which possess a material architecture of modulated coarse-grained and nanocrystalline features stacked in a laminate configuration, represent an ideal structure to study the influence of abrupt heterogeneities on deformation behaviour. While the deformation mechanisms of homogeneous …
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Forced vibration and hygrothermal analysis of composite laminated beams under the action of moving loads
The dynamic response of simply supported glass/epoxy composite beams subjected to moving loads in a hygrothermal environment is carried out using the general purpose finite element program ANSYS. The moving load model and the hygrothermal incorporation are validated separately by reproducing …
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Harakeke fibre as reinforcement in epoxy matrix composites and its hybridisation with hemp fibre
… few decades, due to increasing global awareness of environmental issues, there has been great interest and motivation in research to develop natural fibre composites to replace glass fibre composites in certain applications. Harakeke fibre known as New Zealand flax or Phormium tenax used to be an …
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Modeling the microwave frequency permittivity of thermoplastic composite materials
… predict the microwave frequency permittivities of unidirectional-fiber-reinforced thermoplastic-matrix composite materials as a function of fiber volume fraction, fiber orientation relative to the electric field, and temperature. The permittivities of the constituent fiber and plastic materials …
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Torque Limit of a Mechanical Fastener in a Graphite/Epoxy Joint
<p>Presently there is a lack of confidence amongst engineers when specifying the preload of a mechanical fastener in a composite joint due to a lack of a fundamental knowledge base regarding the behavior of composites under fastener compressive load. As such, a novel experimental procedure was …
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Micro-Mechanics Based Representative Volume Element Modeling Of Heterogeneous Cementitious Materials
The current work focuses on evaluation of the effective elastic properties of cementitious materials through a voxel based FEA approach. Voxels are generated for a heterogeneous cementitious material (Type-I cement) consisting of typical volume fractions of various constituent phases from digital …
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Micromechanics-based approach to predict strength and stiffness of composite materials
One of the key issues concerning the durability of composites is the strength and stiffness degradation during service. Traditionally, these materials have been analyzed by methods which do not take into account variations in the material at the fiber/matrix level. In addition, manufacturing …
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Geopolymer-derived ceramics and composites
The development of ceramics and composites from geopolymer precursors is leading to exciting new avenues in ceramic synthesis and composite applications. In this work, we developed, synthesized, and characterized materials derived from geopolymers for use in extreme environments. In the first …
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Percolation and homogenization theories for heterogeneous materials
… 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 properties to a large degree, making the simple …
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Co-deformation of an aluminum zinc alloy
… niobium, it has been found that as the scale of the two phases decreases, there is an anomalous increase in strength. Mechanisms of this strengthening have been postulated, but a general theory has yet to be developed. A model system to study the co-deformation of fine scale materials was …
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Effects of vacancies and electron temperature on the electron phonon coupling in cubic silicon carbide and their connection to the inelastic thermal spike
… nuclear and space applications. The importance of the electron-phonon interaction in primary damage production in 3C-SiC is the subject of this research. </p><p>The electron-phonon coupling factor was calculated using a hybrid Density Functional Perturbation Theory - Classical Electron Gas …
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Electronic band structure of III-V quantum dots using tight-binding and the k.p approximation
… an effective continuum local density of states using FEM solutions to the Schr{\""o}dinger equation. The local density of states predicted by the tight-binding model is shown to compare qualitatively to the continuum reconstructed LDOS. The local charge density between models is also …
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Measurement of tissue optical properties during mechanical compression using swept source optical coherence tomography
… can provide minimally-invasive treatment of cancers. Their effectiveness is limited by light penetration depth in tissue due to its highly scattering properties. The highly disordered refractive index distribution in tissue leads to multiple-scattering of incident light. It has been …
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Taylor Impact Test and Penetration of Reinforced Concrete Targets by Cylindrical Composite Rods
… to analyze two problems: (a) the normal impact of a cylindrical monolithic or composite rod against a smooth flat rigid target, (commonly known as the Taylor impact test), and (b) the penetration of composite and monolithic steel cylindrical rods into reinforced concrete targets. The composite …
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A Systematic Stiffness-Temperature Model for Polymers and Applications to the Prediction of Composite Behavior
… more and more extensively and over wider ranges of service conditions. Large changes in pressure, chemical environment or temperature influence the mechanical response of such composites. In the present effort, we focus on temperature, a parameter of primary interest in almost all engineering …
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Large strain flexural testing of thin composite laminates
Carbon fiber composites are of significant interest for use in deployable space structures. Elastically folded thin laminates can be utilized as hinge mechanisms in structural systems such as solar arrays, reflectors, and instrument booms, allowing for compact packaging during launch to orbit. …
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Cellulose fiber reinforced thermoplastic composites: Processing and Product Charateristics
… tulipifera) wood were assessed in terms of (a) their impact on torque during melt processing of a thermoplastic cellulose ester (plasticized CAB); (b) their fiber incorporation and dispersion characteristics in a CAB-based composite by SEM and image analysis, respectively; and (c) their …
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Multiscale Analysis of Failure in Heterogeneous Solids Under Dynamic Loading
… transient finite thermomechanical deformations of heat-conducting particulate composites comprised of circular tungsten particulates in nickel-iron matrix are analyzed using the finite element method to delineate the initiation and propagation of brittle/ductile failures by the nodal release …
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Structural mechanics of a plate with multiple dimples
… sheets and shells are an important category of structural components, and while commonly used, they are often only utilised in simplistic geometries. An increased understanding of the geometric and structural behaviour of more sophisticated geometries allows for the optimisation of …
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The Manufacture and Mechanical Properties of Poly(ethylene terephthalate) Fibers Filled with Organically-Modified Montmorillonite
… terephthalate), PET, fibers by the addition of layered silicate nanoparticles and by drawing the un-oriented nanocomposite filaments in a second step. No previous studies on PET fibers filled with montmorillonite (MMT) nanoclay examined fiber drawability at temperatures above the glass …
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