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 28 for “"Micromechanical model"”.
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A micromechanical model for predicting tensile strength
A novel micromechanical model for predicting the failure of polymeric and ceramic matrices under an applied global tensile loading is presented. The model is based on a Weibull statistical type of approach and incorporates eleven different variables to simulate different micromechanical failure …
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Scaling the rock : a micromechanical model for the elastic properties of hydrated cement pastes
… properties is limited. In this thesis, a micromechanical model for the purpose of cement hydration simulation was developed and tested using HYMOSTRUC3D hydration software and a micromechanical particle with interphase model developed by Deng and Van Vliet. It was then tested against …
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Micromechanical model for damage and failure of brittle materials : application to polycrystalline ice and concrete
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Micromechanics-Based Analysis of Fiber-Reinforced Laminated Composites
… for three-dimensional nonlinear material modelling of fiber-reinforced laminated composites is presented. The material modelling procedure has a two-level hierarchical structure. At the bottom level, constitutive information about the fiber and the matrix phases are synthesized using a …
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Radiation and temperature effects on the time-dependent response of T300/934 graphite/epoxy
… in the 934 resin structure. An analytical, micromechanical model was also developed to predict the viscoelastic response of fiber reinforced composite materials. The model was shown to correlate well with experimental results for linearly viscoelastic materials with relatively small creep …
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Microstructure and Its Relationship to Fracture in Portland Cement Mortar and Concrete
… with respect to the flat-crack toughness using a micromechanical model. The effect of the model parameters, microscopy techniques, material elastic properties, void modeling and branching ratio were investigated. The parametric analysis and modeling conditions determine a nearly uniform flat-crack …
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Mechanical response of unidirectional Boron/Aluminum under combined loading
… on the far field stress ōₓₓ, the Pagano-Halpin Model, and finite element analysis. Yield loci were generated for different stress ratios and were compared for the three different test methods, taking into account residual stresses and specimen geometry. The yield locus for in-plane shear was …
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Investigation of Residual Stresses in Shape Memory Alloy (Sma) Composites
A three-phase concentric cylinder micromechanics model and an SMA composite thermoelastic beam theory were developed to analyze the micromechanical and structural-level thermal and transformational stresses for nitinol composites induced by nitinol wires embedded in a host matrix. A series of …
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Actuation and Charge Transport Modeling of Ionic Liquid-Ionic Polymer Transducers
… when an ionic liquid is used as solvent. A micromechanical model of IPT actuation is developed following a previous approach given by Nemat-Nasser, and the dominant relationships in actuation are demonstrated through an analysis of electrostatic cluster interactions. The elastic modulus of …
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Stress rupture of unidirectional polymer matrix composites in bending at elevated temperatures
… led to coherent results. These results have been modeled using the large deflection of buckled bars theory (elastica) and it is possible to predict with good accuracy the strain at each point of the specimen if the end-to-end distance is known. The failure process has been experimentally …
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A feasibility study on using surface treated kaolin mineral in thermoplastic composites
… the effects of manufacturing conditions. A micromechanical model is employed to compare experimental results to theoretical predictions. Results suggest that high aspect ratio fillers increase the strength and stiffness of the composite. Conversely, low aspect ratio particles improve impact …
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Brownian dynamics simulations of fine-scale molecular models
… molecular configurations and orientations, a micromechanical representation of a polymer molecule must be proposed. A micromechanical model may be fine scale, such as the Kramers chain model, which accurately predicts a real polymer's heological properties, but at the same time possesses too …
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Mechanism of anisotropic shrinkage during sintering of metalli powders
… elaborated according to the shrinkage kinetics model of classical sintering theory, to calculate an effective diffusion coefficient along the two directions, which resulted higher for direction parallel to the compaction direction than perpendicular to it. In both directions, the effective …
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Microstructure-based modeling of damage and healing in salt rock with application to geological storage
… properties. This research investigates the modeling of damage and healing in rocks with applications in geological storage. This presentation focuses on salt rock, which is used as a model material to study rock microstructure evolution under various stress paths, and to understand the …
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Properties and processing of direct-spun carbon nanotube mats
… and understood through experiment and micromechanical modelling. Macroscopic carbon nanotube material properties are surmised with material property charts that elucidate the relationships between processing, microstructure and properties, and identify the contribution of different …
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Investigation on the mechanisms of block cracking in asphalt pavements
… thesis, a three-dimensional analytical elastic model of a two-layer pavement system subjected to constant thermal stresses, a two-dimensional discrete element viscoelastic and heterogeneous micromechanical model, and a three-dimensional discrete element viscoelastic and inhomogeneous …
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Biomechanical structure-function relationships of collagen tissues, B Cell membranes, and amyloid fibers
… components in biological systems. A novel micromechanical model describing the force-extension of wavy fibers comprising these tissues is integrated with bundle and network frameworks. The developed models accurately predict the mechanical behavior of bundled fiber tissues (i.e ligaments …
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From Micro- to Nano-porous Cellular Materials with Layered 2D Microstructure
… capturing their behaviour in a new hierarchical model framework. These novel structures have the potential to combine the properties of structured porous materials, i.e. low density, high geometric surface area, permeability and mechanical stability, with the intrinsic properties of 2D materials …
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Evolution of Fault Strength from Microscopic Asperity Scale to Macroscopic Fault Zone Scale
… the evolution of fault strength. I first use a micromechanical model of flash heating that describes how shear resistance evolves at the asperity scale as a result of distributed deformation over a weak layer that grows during the brief lifetime of each asperity contact. The model predicts that …
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