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 13 of 13 for “"Environmental Aging"”.
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Synergistic Environmental Aging of Glass Reinforced Polymer Composites
<p>Synergistic effects involved in the environmental degradation of Glass Reinforced Polymer (GRP) composites were examined and a novel synergistic aging model was proposed in this study. Six GRPs based on glass fibers with four different polymer resins and six pure polymer thermoplastic resins …
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Using vibrational spectroscopy to analyse the effect of environmental aging on gel pen inks
… The paper used to write ink samples on for the aging study was analysed to show consistent spectra between sheets of a single ream. This analysis was vital to determine whether all of the ink samples were to be produced onto paper which would produce the same or different spectra. As the paper …
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The effect of environmental aging/exposure on the durability of high performance polymeric composites
… However, the long-term durability and environmental stability of these materials continue to be under question. Continued application of these composites in aerospace structures is contingent upon the long-term durability of these material systems. Polymeric materials have been known to …
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The Use of Nanonindentation to Determine Composite Interfacial Shear Strength and the Effects of Environmental Aging
… of wet and dry specimens subjected to equivalent aging times. Matrix swelling is not, however, responsible for the increase in IFSS of the PVP material. The relationship between tensile strength and IFSS proves to be small as predicted by a tensile strength model, but processing defects and other …
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Modelling of the degradation of mechanical properties of glass fiber reinforced composites (GFRP) due to environmental aging
… in the design of modern aircrafts. The Environmental Control System (ECS) of civil aircraft is a vital subsystem for the safety and comfort of passengers. The ECS usually focuses on the inside part of the vehicle, whereas the environmental control of the outer side is usually named …
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Aging Assessment of High Voltage Single Component Room Temperature Vulcanized Silicone Rubber (RTV-1) Subjected to Aqueous Salt
… other applications is frequently subjected to environmental pollutants. Aging of RTV-1 silicone rubber is the result of various stressors, including environmental aging conditions such as UV, acid, and salt exposure from ocean mist. Loss of hydrophobicity due to damage of the hydrophobic methyl …
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Analyses Of Pultruded Polyester/ E-Glass Composites Subjected To Environmental Degradation
… mechanical characterization that included environmental aging for two different exposure lengths (500 hours and 1000 hours) in five different environments: UV, bleach, hydrochloric acid, distilled water at 125â°f, and room temperature salt water. Three-point flexural bending and short beam …
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Crash Analysis of Degraded Concrete Containment Structures
… cask structures will degrade due to the natural aging and the environmental effect shrinkage, creep, heat transfer, moisture diffusion, and Alkali-Silica Reaction (ASR). Long-term creep and shrinkage of vertical dry cask are modeled using the B4 creep formulation for concrete. The results show …
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Compósitos poliméricos a base de fibras de licuri: efeitos da hibridização e do envelhecimento ambiental acelerado
… the response of these composites against adverse environmental conditions, such as ultraviolet radiation, high temperature and moist. Also the search for new composite using natural fibers or a blend of it with synthetic fibers as reinforcement has been studied. In this sense, this research begins …
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A Study of Durability for Elastomeric Fuel Cell Seals and an Examination of Confinement Effects in Elastomeric Joints
… aged at several different imposed strains and aging times in environments of interest. Tearing energy was evaluated using trouser test samples tested under different rates and temperatures after various environmental aging conditions. Additionally, tearing tests were conducted on samples tested …
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Repair of damaged end regions of prestressed concrete girders using fiber reinforced polymer composite materials
… concrete specimens are performed. An accelerated aging scheme consisting of freeze/thaw cycling in the presence of a deicing salt solution is implemented to determine the effect of long-term environmental exposure on the FRP/concrete interface. In the next phase, three-point bending tests are …
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Evaluating Thermal and Mechanical Properties of Electrically Conductive Adhesives for Electronic Applications
… manufactured by Triad Circuit Inc. Effects of environmental aging on the durability of conductive adhesives and their joints were evaluated. All the samples for both mechanical tests and thermal tests were aged at 85%, 100%RH for periods of up to 50 days. Studies of bulk conductive adhesives …
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Design and characterization of aromatic thermosetting copolyester resin for polymer matrix nanocomposites
… following direct exposure to aggressive environmental aging conditions. Bioactive nanofiller particles reinforced bionanocomposites hold a promise as a reconfigurable bone replacement material, for which interfacial coupling with nanoparticles enables more deformation tolerant …