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 23 for “"stress development"”.
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Predicting Stress Development in Gray Iron Foundry Castings
A method has been developed to predict stress development in gray iron foundry castings. Using a commercial finite element package with a user written element formulation, stresses resulting from thermal displacements in the cooling casting are computed while accounting for cast iron's radically …
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Stress development in particulate, nano-composite and polymeric coatings.
The main goal of this research is to study the stress, structural and mechanical property development during the drying of particulate coatings, nano-composite coatings and VOC compliant refinish clearcoats. The results obtained during this research establish the mechanism for the stress …
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In situ investigation of electrochemical surface stress development in rechargeable batteries
… vs. lithium and sodium. There are two types of stress evolutions arising from lithiation/sodiation and delithiation/desodiation. Accommodating metal ion process makes compressive stress whereas stripping metal ion process makes tensile stress. These two types of stress evolution was measured by …
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Mass transfer, creep and stress development during the drying of red oak
… to gain strain components and associated stresses which develop as the result of mass transfer and restraint of shrinkage in red oak. Particular emphasis was placed on the rheological or creep components of strain. Mass transfer was measured during the first four days of drying under …
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Evolution of local structure and stress development during thermal treatment of sol-gel-derived PZT-based thin layers
… variations in local structure and network development for sol-gel derived precursors in the lead zirconate titanate (PZT) system as a function of heat treatment conditions.
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Residual Stress Development and Effect on the Piezoelectric Performance of Sol -Gel Derived Lead Zirconate Titanate (Pzt) Thin Films
… are explored as a means to reduce residual stress within film features. For the soft lithographic technique, film features are created by selective film cracking, a result of poor substrate adhesion promoted by a mediated, self-assembled monolayer. Wafer curvature stress measurements and …
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Stress and microstructure development in particle-based coatings
… range of uses and applications in everyday life. Stress development during the drying process has the potential to impact the performance of the coating. Stress development can be monitored in-situ using a cantilever deflection technique with a laser-photodiode combination. Stress development in …
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Stress, fracture, and microstructure development of drying aqueous particulate coatings
… However, aqueous particulate coatings develop stress during drying, making them prone to stress-induced defects such as cracking, curling, and delamination. Additionally, aqueous formulations often rely on latex particles to coalesce and form a continuous film at room temperature. In this work, …
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Foam formation in a PMMA-methanol system
… is partly analogous to the CO2-based nanofoam development process, but experimentally more accessible. This foam and its development were characterized and important mechanisms in the process for nucleation and void development were identified. The most important finding was that …
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Coupled Thermal-Mechanical Fixed-Grid Finite-Element Model With Application to Initial Solidification
… is developed to simulate temperature, shape, and stress development in a solidifying steel shell during the initial stage of continuous casting. This verified model is applied to predict the distorted shape of a vertical section through the solidifying shell, during a sudden fluctuation in liquid …
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Dewetting and Stress Evolution in Thin Films During Ion Irradiation
… This project also investigates the stress evolution in thin films when they're bombarded with ∼1keV ions. Processes such as vacancy creation and phase transformation play important roles in the stress accumulation of the films. Meanwhile, it is discovered that atoms can be …
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Dimensional Stability of Multilayer Circuit Boards
… to predict the deformation and residual stress state due to relamination. Experimental values of the substrate stress relaxation modulus and coefficients of thermal expansion (CTE) are used as inputs in the numerical procedure to predict warpage of model circuit boards with a …
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Residual stress in nanocrystalline nickel tungsten electrodeposits
Characterizing the residual stress of thick nanocrystalline electrodeposits poses several unique challenges due to their fine grain structure, thickness distribution, and matte surface. We employ a three-dimensional profilometry-based approach that addresses each of these complicating factors and …
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Intelligent ambiance : digitally mediated workspace atmosphere, augmenting experiences and supporting wellbeing
… work, are physiological responses indicating stress development and restoration, with interesting implications for health and wellbeing applications. We develop a sensor data collection infrastructure to complement the workspace's controllable ambiance, with rich, real-time information about …
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Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis
… ascertain the relative importance of each to the development of stress in the coating. It was determined that TGO growth and rumpling have effects on the major trends of stress development, while aluminum depletion has a more minor role. A previously developed viscoplastic constitutive model, …
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Strength of slender reinforced concrete walls
… point loads at the top level. Aspects such as stress development, in-plane and out-of-plane deformations, cracks and modes of failures were thoroughly investigated. Experimental stresses are compared with solutions given by the Finite Element technique. It is shown that the shear strength of …
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Origin and development of internal stresses during polymerization of composite resins
This study is focused on the development of polymerization stresses. These are non functional stresses and arise especially when the adhesive composite materials are cured in a cavity, in which the polymerization contraction is restrained by the cavity walls. During masticatory functioning these …
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Early age creep and shrinkage of emerging concrete materials
… dilation. When concrete is restrained, tensile stress develops due to shrinkage and increases the probability of cracking. Early age properties, such as tensile creep, are not well understood and the availability of literature on the subject is limited. The goal of this research is to improve …
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The Lived Experience of Intersectionality Among African American Women with Breast Cancer
… have additional upstream risk factors for the development of breast cancer that stem from life within the intersection. Implications for future research as a result of this study include: a community based participatory research project to examine the psychological effects of stress, …
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A control volume unstructured grid approach to the solution of the elastic stress-strain equations
… and apply algorithms for the solution of elastic stress-strain equations based upon a control volume approach on unstructured meshes. The purpose is to integrate the solution of solid mechanics with that of fluid flow and heat transfer within the context of solidification problems in the casting …
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