In this research, the degradation of carbon fiber/vinylester composites in marine environments was experimentally investigated. Additionally, two types of carbon fiber surface treatments, namely Polyhedral Oligomeric Silsesquioxane (POSS) and the industrial surface treatment F0E, were evaluated to determine their effectiveness in creating a fiber/matrix (F/M) interface for use in the marine environment. Electrochemical Impedance Spectroscopy (EIS) was explored as a new application of an existing technique for use in measuring the amount of water at the F/M interface in carbon fiber/vinylester composites. EIS spectra were used to determine equivalent electric circuit models that allow for the prediction of water at the interface. The location of water within the composite was determined through Positron Annihilation Lifetime Spectroscopy (PALS). Interlaminar shear strength and transverse tensile tests were carried out for dry conditions and after hygrothermal exposure of the composites to study the influence of the integrity of the F/M interface on the macroscopic response of the composite. / by Chris J. Vinci. / Thesis (M.S.C.S.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

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The material properties of the candidate fiber-reinforced composite materials and different fabrication methods for fiber composites were discussed. The improvement of the hand lay-up process for polyurethane impregnated Kevlar was investigated. Testing samples for lab and prototype tests were fabricated by hand lay-up process. The study showed that fiber composites fabricated by the hand lay-up process can achieve good properties, and advanced fabrication methods could be applied In industrial manufacturing processes to improve the fiber composite properties. A nonlinear static analysis was discussed. The ANSYS finite element analysis computer program was used to build stress analysis models, simulate the loading conditions, and perform the nonlinear static analysis. The tensile strength proof test was designed and done by using a microcomputer controlled Instron 4505. It showed that the different types of fiber composites can meet the strength requirements for the application. Polyurethane impregnated Kevlar showed the best strength properties among the different types of fiber composites, which were fabricated and tested. The wear and abrasion properties of the different types of fiber composites were discussed and relevant tests were introduced. An ultraviolet light exposure test and the Oregon Department of Transportation road-cover test were conducted. Moisture and acid resistance and cost analysis were also discussed. Based on the results of the study, a prediction of the optimal fiber-reinforced composite materials was made. Also, various conclusions and recommendations for future research work were made. / Graduation date: 2000

The presence of chlorine in the subcratonic lithospheric mantle (SCLM) has been evaluated by compiling the compositional data of fluid inclusions in fibrous diamonds. Chlorine associates with potassium, dissolving in water and forming a KCl-bearing brine with the Cl/(Cl+H2O) molar ratio of 0.05-0.68. To examine the effect of such a KCl-bearing brine on the melting behavior of the SCLM, we conducted experiments in the Mg2SiO4-MgSiO3-H2O and Mg2SiO4-MgSiO3-KCl-H2O systems at 5 GPa and 1100-1700C. In the Mg2SiO4-MgSiO3-H2O system, the solidus temperature of forsterite+enstatite is ~1230C. In the Mg2SiO4-MgSiO3-KCl-H2O systems with molar Cl/(Cl+H2O) ratios of 0.2, 0.4 and 0.6, the solidus temperatures are ~1430C, ~1530C and ~1580C, respectively. The increase in the temperature of the solidus demonstrates that KCl elevates the solidus of the Mg2SiO4-MgSiO3-H2O system. Therefore, KCl in the SCLM can prevent melting at the H2O-saturated solidus, and a KCl-bearing fluid can be a robust agent for mantle metasomatism.

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Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 286-307). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Dr. Steve Johnson; Committee Member: Dr. Andrew Makeev; Committee Member: Kyriaki Kalaitzidou. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (Ph. D.)--Institute of Paper Chemistry, 1965. / Includes bibliographical references (p. 128-130).

Thesis (Ph. D.)--Institute of Paper Chemistry, 1963. / Bibliography: leaves 116-118.