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 29 for “"Aggressive Environments"”.
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Fiber-Reinforced Polymer Bridge Girders for Extremely Aggressive Environments
… 50 years, certain bridges subjected to extremely aggressive marine environments may not reach this desired target. This research paper investigates using fiber-reinforced polymer (FRP) materials as primary bridge girders in medium span bridges (30 ft. to 75 ft.). The goal of this research is to …
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Development of polymer bonded magnets with enhanced magneto-mechanical properties for high temperature and aggressive environments
… in high temperature and chemically-corrosive environments where commercial permanent Nd-Fe-B magnets are not useable.
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Corrosion of reinforcement in concrete : the effectiveness of organic corrosion inhibitors
… the service life of structures built in aggressive environments. One method of increasing the durability of concrete in aggressive environments is the use of corrosion inhibitors. In this work, two organic corrosion inhibitors were tested to observe their effectiveness in decreasing the …
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Performance of a penetrating corrosion inhibitor in controlling carbonation induced corrosion in reinforced concrete
… of improving the durability of concrete in aggressive environments is the use of corrosion inhibitors. In this work the effectiveness of an organic penetrating corrosion inhibitor in reducing the rate of corrosion and delaying the onset of corrosion in carbonated concrete is discussed, with …
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Environmental effects on the fatigue behavior of copper nickel alloys
… on copper nickel alloys in helium, salt water environments. The hydrogen, oxygen, two alloys used air and in this investigation were 90-10 and 70-30 copper nickel. Both alloys contained iron which was added to improve the erosion corrosion resistance. The extent of cracking varied with the test …
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Impact fracture of austenitic stainless steels
… range of temperatures and extended exposure in aggressive environments, including hydrogen gas. Because of the risk of catastrophe if brittle failure occurs, careful material selection is imperative. Austenitic stainless steels may be a likely choice for hydrogen service because their behavior …
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Ensaios e metodologias de análise de integridade para equipamentos em aço baixa liga sujeitos à fragilização por hidrogênio
… to perform fitness for service evaluations in aggressive environments with reliable fracture toughness data allows the safe operation of hard-to-inspect/repair equipment (namely subsea), thus avoiding production losses, environmental hazards and costly interventions.
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Chemical modification of polymers
… additives which resist migration under aggressive environments. Previous studies have shown that stable nitroxyl radicals function as stabilisers in polymer during processing (e.g. PP, PVC) by deactivating a large number of kinetic chains via a redox process whereby the concentrations of …
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Avaliação de permeação de hidrogênio em célula multiteste e susceptibilidade ao trincamento sob tensão em presença de sulfeto de um aço de especificação API 5L X70
The oil and gas industry faces extremely aggressive environments, which requires the use of materials with high resistance to corrosion and toughness. In the case of the Brazilian pre-salt, the problem is especially serious because of the high levels of CO2 (carbon dioxide), and especially of H2S …
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Sustainable cementitious materials for building and sorption applications
… OPC faces durability challenges, particularly in aggressive environments. Hence, there is rapidly increasing interest in sustainable alternative cements with lower carbon footprint, lower energy consumption, and those that offer superior properties that are beneficial for specific applications. …
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Corrosion studies on alpha tantalum and beta tantalum coated steel
… high ductility and high corrosion resistance in aggressive environments. When deposited as a film on steel substrates by sputtering, either [alpha]-Ta, [beta]-Ta, or a mixture of both phases have been observed under varying deposition conditions. To evaluate corrosion behavior of Ta coatings, …
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Evaluation of Chloride Diffusion in Concrete Using Bulk Diffusion Test and Scanning Electron Microscopy
… of concrete is chloride penetration in aggressive environments such as marine or coastal areas. In such environments, chloride ions can penetrate into the pores of concrete leading to the corrosion of embedded steel reinforcement which compromises the structural integrity of concrete. To …
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Effect of Galvanic Corrosion on Crack Propagation of Cold Expanded Holes in AA2024-T3
… be taken to simulate realistic applications in aggressive environments.</p> <p>In this research, a relationship between crack propagation and secondary crack initiation will be established for AA2024-T3 cold worked holes subjected to cyclic loads to determine the impact on fatigue life of joints …
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Effects of Surface Condition and Environmental Exposure on the Bond between CFRP and Steel
… susceptible to corrosion damage when exposed to aggressive environments and deicing salts. The conventional methods for repairing steel structures can be labor-intensive and time-consuming, and add considerable weight to the existing structure. One alternative is utilizing carbon fiber reinforced …
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Determining Interfacial Adhesion Performance and Reliability for Microelectronics Applications Using a Wedge Test Method
… preconditioning in deionized (DI) water and more aggressive solution mixtures prior to wedge insertion to study the effect of prior environmental exposure time on the system. The wedge test data from preconditioned specimens were compared with standard wedge test results and the system was …
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Thermal expansion behavior of Mo-Si-B system intermetallics
… materials that can withstand oxidizing and aggressive environments at temperatures above 1000 0C. Mo-Si-B system intermetallics have been attracting attention as promising candidate materials for such applications, especially materials containing Mo5Si3 (T1) phase. However, Mo5Si3 single …
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Reliability-based performance assessment and optimum maintenance of corroded reinforced concrete structures
… of reinforced concrete structures exposed to aggressive environments. Deterioration caused by reinforcement corrosion reduces the serviceability and load bearing capacity of the concrete structures to an extent of serious structural failure. Consequently, this increases the resources required …
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Concrete crack width under combined reinforcement corrosion and applied load
… to chlorides, carbon dioxide laden and other aggressive environments, corrosion of the reinforcing steel is seen as a global problem. Maintenance and repairs resulting primarily from premature concrete cracking and spalling have an estimated cost running to $100 billion per annum world-wide. …
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Flexural Behavior of CFRP-Pretensioned Girders
Highway bridge beams are subjected to aggressive environments, temperature fluctuations, and a large number of loading cycles. The combination of these factors can result in deterioration of highway bridge beams’ serviceability and strength. Beams prestressed with steel are susceptible to corrosion …
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Synthesis and evaluation of novel ligands for quantum dot stabilisation and polymerisation studies
… by exposure to a number of different environments. The effect upon the stability of the quantum dots was monitored by changes in the photoluminescence ability of their cores. Subtle differences between different batches of quantum dots were observed and the necessity to account for …
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