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 16 of 16 for “"Sustained load"”.
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Time-dependent response of flat plate structures under high sustained load
… (RC) structures may be exposed to high levels of sustained stresses resulting from errors in construction or design, abnormal loading, and material degradation. Although most RC structures are designed to withstand service level load with a large safety factor, errors may cause failure or …
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Micromechanics of Hydrogen-Induced Crack Initiation in Pipeline Steels and Subcritical Crack Growth
… of hydrogen on ductile fracture, we model sustained-load cracking in the iron-base superalloy 1N903 at hydrogen pressures at which fracture is governed by plasticity. Through a micromechanics analysis, we quantify the void growth dependence on stress triaxiality and hydrogen-induced …
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Incorporation of Carbon Nanoparticles in Polyaryletherketone Matrices for High Performance Liquid Chromatography Applications
… of adding carbon nano particles at a 1% weight loading to 30% carbon fiber loaded PAEK plastics via a simple melt blending process were explored and compared to neat PAEK blends. Experimental blends were tested for their Young’s modulus, relaxation under sustained load and temperature, yield …
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Alkaline durability tests for E-glass/vinyl ester-reinforced polymer with nanoclay
… (800-lbs), 2225N (500-lbs) and 885N (200-lbs) of sustained load, which were 50%, 31% and 12.5% of the tensile strength, respectively. Time to failure or tensile strength reduction was measured and used to determine durability of the samples in terms of Aging Index, which was proposed as the …
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Internal hydrogen-induced subcritical crack growth in stainless steels
… salt electrolyte. Constant strain rate tests and sustained load tests were performed in air at temperatures from 0 to 50$\sp\circ$C with hydrogen contents up to 41 wt. ppm. The electrical potential drop method with optical calibration was used to monitor the crack growth position, continuously.
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Effect of surface hardening conditions on susceptibility of fasteners to hydrogen embrittlement
… data for fastener standards. Through sustained load and incremental step load embrittlement testing techniques, the susceptibility of case hardened steel tapping screws to internal and environmental hydrogen embrittlement is examined. Further characterization of the fastener samples …
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Deformation of partially prestressed concrete beams under service loads.
… beams in which 50 percent of the service load was sustained for a period of up to 46 days during which time the load was increased to the full service load up to seven times in intermittent short-term cycles. One cycle of short-term loading was carried out at intervals of about five days. …
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A theory for the time dependent yielding and creep of clay
… in preconsolidation pressure with time under sustained load. The theory appears to be consistent with many aspects of the consolidation behavior of real clays, including: (1) secondary compression, (2) aging, (3) different values of Cv determined by Casagrande's method and Taylor's method, and …
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Effects of aging on bond between FRP and concrete
… adverse environmental conditions including sustained stress. The study involves using an epoxy based system to bond glass and carbon fabrics to concrete. Specimens were aged by means of soaking them in alkaline, water, or acid solutions at either constant temperature or varying temperature …
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The nanogranular origin of concrete creep : a nanoindentation investigation of microstructure and fundamental properties of calcium-silicate-hydrates
… material on Earth. But concrete subject to sustained load creeps, like chewing gum, at a rate that deteriorates the durability and lifespan of concrete infrastructure. While it is generally agreed that concrete creep originates from the complex viscous behavior of nanometer-sized building …
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Performance of confined concrete columns under simulated life cycles
… concrete behavior, including the impact of sustained service loads on long term and ultimate behavior. An experimental program which examines the effects of sustained service loading on the ultimate axial performance of FRP confined concrete is presented. The program's purpose is to …
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Bio-inspired composites : a de novo approach to the conceptualization, design and synthesis of tough mesoscale structures with simple building blocks
… that exhibit stable fracture propagation under sustained load transfer and increasing deformation. Furthermore, a detailed study of the basic interactions between constituents phases in a composite lead to fundamental insights of elastic interactions and stiffness ratios as controlling elements …
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Retrofitting of reinforced concrete beams with CFRP straps to enhance shear capacity
… capacity is also affected by the size of the loading pad. A Finite Element Analysis determined that holes in the flange act as crack propagators, strap penetration affects the stiffness of the beam and undersized load pads allow shear cracks to form on lower energy paths. Design equations were …
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Retrofitting of reinforced concrete beams with CFRP straps to enhance shear capacity
… capacity is also affected by the size of the loading pad. A Finite Element Analysis determined that holes in the flange act as crack propagators, strap penetration affects the stiffness of the beam and undersized load pads allow shear cracks to form on lower energy paths. Design equations were …
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FRP-Based High-Performance Building Envelopes - An investigation on the environmental performance of GFRP sandwich panels
… foam core can potentially provide an integrated, loadbearing and lightweight solution for geometrically complex building envelopes. One of the barriers to their uptake is the lack of data on their durability and long-term performance in service conditions. Facades are inevitably exposed to …
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Behaviour of epoxy filled flat-face joints in concrete for wave energy converters
… of jointed systems under static and cyclic loading in seawater salt solution and under cycles of wetting and drying.<br/><br/>Therefore, this research was aimed at undertaking an extensive experimental programme to determine how concrete elements joined by epoxy bond lines function. The work …