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 36 for “"high modulus."”.
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High modulus carbon fiber/titanium laminates
… been used to meet ever-stricter standards for high-temperature performance, creep resistance, low weight and high strength. Having low density, a high melting point, and high tensile strength, it seems like the perfect material for numerous applications. For structural applications where …
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BOND BEHAVIOR BETWEEN STEEL AND HIGH MODULUS CFRP PLATES AT MODERATLEY ELEVATED TEMPERATURES
… strengthened with different configurations of high modulus CFRP plates and subjected to different combinations of applied load and ambient temperature. The temperature ranges considered were selected to represent typical environmental conditions experienced by many steel bridges and structures …
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Strengthening Damaged Reinforced Concrete Beams and Slender Columns Using Ultra-High Modulus CFRP Plates
This thesis investigates the application of ultra-high modulus carbon fiber reinforced polymer (CFRP) plates to strengthen damaged reinforced concrete beams and slender columns. In the first phase, two different pre-repair loading histories were simulated in seven 3000x300x150 mm reinforced …
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Fatigue Strengthening of Damaged Steel Plates using Ultra-High Modulus Carbon Fibre-reinforced Polymer Plates
… of externally bonded small patch Ultra-high modulus (UHM) carbon-fiber reinforced polymer (CFRP) plates of 460 GPa modulus in extending fatigue life and slowing crack propagation in steel plates with simulated fatigue cracks. The study investigates a range of bond lengths at or below the …
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Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties
… thermoplastic composites were prepared using high modulus lyocell fibers and cellulose acetate butyrate (CAB). Two reinforcement fiber types: fabric and continuous fiber tow were used. Fabric had advantages of uniform alignment and easier processing, but lacked the use as a unidirectional …
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Altering the fiber-matrix interphase in semicrystalline polymer matrix composites
… composite system, i.e., nylon 66 reinforced with high modulus carbon fibers. In many systems this additional phase can be avoided simply by altering the crystallization history of the matrix polymer. In this study, the interphase region is removed not by changing the crystallization history of the …
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Block Copolymer-derived Porous Polyimides and Carbon for High-Performance Energy Storage
… porous materials are felicitous for use in high-performance energy storage. This dissertation presents the utilization of block copolymers to derive nanoporous materials: i) high-modulus polyimide separators for lithium-metal batteries, and ii) high-surface-area carbon electrodes for …
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The Effect of Equal Channel Angular Extrusion (ECAE) and Boron Additions on the Mechanical Properties of a Biomedical Ti-Nb-Zr-Ta (TNZT) Alloy
… shortcomings: e.g. incomplete biocompatibility, high modulus, etc.) of the traditionally used materials in joint replacement prostheses. Equal channel angular extrusion: ECAE) processing has the capability to improve the mechanical properties of these alloys to broaden their potential biomedical …
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The heterogeneous biochemical modification of porous collagen scaffolds for tissue engineering applications
… was created with two distinct compartment a high modulus “bone” compartment and a low modulus “cartilage” compartment. . This technique was used to model the osteochondral interface.
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Lyocell Fiber-Reinforced Cellulose Ester Composites - Surface and Consolidation Considerations, and Properties
… of cellulose acetate butyrate (CAB) and high modulus, continuous, regenerated cellulose fiber (lyocell). Of particular concern were both the interfacial adhesion between the fiber and matrix and the consolidation process in the manufacture of these composite materials. Interfacial …
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Toughening of cyanate ester networks with reactive thermoplastic modifiers
… importance as potential candidates for high temperature adhesives and composite matrices. Low toughness is a major drawback with most crosslinked thermosetting materials, including the cyanate ester networks. Considerable attention has been devoted to the aspect of toughening such …
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Effects of Surface Condition on the Fatigue Behavior of CFRP-to-Steel Joints
… joints (DSJ) were fabricated consisting of two high-modulus CFRP laminates and ASTM A36 steel plates bonded using a two-part epoxy adhesive. Two types of steel surface conditions were considered to evaluate the fatigue behavior under constant force amplitudes. Roughness on the steel substrate …
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Design of a Gravity Compensation Actuator for Arm Assistance
… as packing boxes on an assembly line may require high strength movements of the shoulder, arm, and hand and may result in musculoskeletal disorders. With the objective to offset the weight of the arm and thereby lower the forces on the muscles in the shoulder and arm, this actuator is able to …
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Synthesis, properties, and morphology of lignin based epoxy resins
… were, depending on lignin content, either low modulus elastomers, or high modulus materials with considerable ductility. The modulus of elasticity was a strong and linear function of lignin content, whereby the highest value was 1100MPa (57% lignin). The curing reaction was of nth-order type, …
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An investigation into the polyethylene extrudates produced by simultaneous orientation and high temperature quenching
… a continuous production of extrudate. High density polyethylene (HOPE) extrudates were prepared from three dies - circular, strip and flat-film - at a range of liquid metal alloy temperatures (111 - 123°C) and over a wide range of draw-downs. The effect of processing on the HOPE …
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Bio-based composites that mimic the plant cell wall
Nature creates high performance materials under modest conditions, i.e., neutral pH and ambient temperature and pressure. One of the most significant materials is the plant cell wall. The plant cell wall is a composite of oriented cellulose microfibrils reinforcing a lignin/hemicellulose matrix. In …
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The structural exploitation of fibrous-cement composites in reinforced concrete T-beams
… act as 'surface reinforcement', incorporate high modulus, asbestos fibres in a predominantly two-dimensional random distribution in a cement matrix. Compared with concrete, these units have a high tensile strength and greater extensibility. The first stage of this investigation is primarily …
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Influence of the Interphase on the Mechanical Properties of Nylon 66 Composites
… such as damping, ultimate stress and strain, and modulus of the composite. This was accomplished using a modified fiber pull-out test on single filament composites, and dynamic mechanical analysis, vibrational adhesion testing, and uni-axial tension testing on bulk composite samples. Additional …
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Synthesis and Characterization of Poly(arylene ether sulfone)s with Novel Structures and Architectures
… The melt viscosities of these polymers in the high frequency region were lower than the control while the stress-strain properties were comparable to those of the control, suggesting that it is possible to reduce the high shear melt viscosities of this type of polymers without affecting the …
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Design of surface and bulk interactions: A computational approach to sustainable energy
… a previously unexplored fabrication route for high-modulus CFs achieved via generating high-density CFs which leads to CFs with isometric compressive and tensile moduli, enabling their potential applications for compressive loading. Finally, using this framework and by defining a parameter that …
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