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 22 for “"Ratcheting"”.
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Thermally-induced ratcheting behaviour of laterally-loaded reinforced concrete energy piles in sand
… temperature change. Thermally-induced pile ratcheting – the accumulated and irreversible pile head displacement towards the loading direction upon repeated pile heating-cooling occurs during the operation of energy piles. However, there is no investigation on any thermally-induced ratcheting …
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Influence of Residual Stress on the Initiation of Fatigue Cracks at Welded Piping Joints
… State University (NCSU) pointed to the strain ratcheting response of the welded joint as a probable reason for fatigue failure and indicated that welding residual stresses might be responsible for inducing this strain ratcheting response. It was the primary objective in this investigation to …
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Development of office paper attachment methodologies
… The concept that was developed and pursued was a ratcheting clip. The ratchet allowed the clip to be tightened, but prevented it from being loosened, unless a release button was pressed. The prototype was built and tested, and the results proved that the ratcheting concept has the potential to …
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Integral bridge abutment and backfill behaviour
… accumulation of soil strain — known as strain ratcheting — which results in increased lateral earth pressures along with settlement at the bridge approach. Uncertainty surrounding strain ratcheting is reflected through design restrictions. This research investigated strain ratcheting and ways …
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Rab35 Centered Membrane Trafficking Pathway Directs Apical Constriction During Drosophila Gastrulation
… are a critical determinant for Sbf/Rab35 ratcheting engagement. These results suggest that periodic ratcheting events shift excess membrane from cell apices into endosomal pathways to permit reshaping of actomyosin networks and the apical surface.</p>
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Design of a high torque, lightweight clutch for use in an exoskeleton to augment human running
… swing phase. The clutch makes use of radial, ratcheting clutch plates, a planetary gearbox, and a novel mechanical decoupling concept to meet the design requirements.
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Numerical Modeling Issues in Finite Element Simulation of Plasticity Induced Crack Closure With an Emphasis on Material Model Effects
… accumulation of permanent deformation (strain ratcheting) is responsible for mesh dependence when the rate of growth depends on the element size. Mesh refinement may commute with the use of multiple load cycles between crack growth increments to provide the same effective growth rate. …
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Multiscale Simulation of Thermocline Energy Storage for Concentrating Solar Power
… tank becomes susceptible to failure via thermal ratcheting. The thermocline tank model is therefore extended to predict wall stress associated with operation and determine if ratcheting is expected to occur. Analysis is first performed with a multilayer structure to identify stable tank wall …
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On mitigation of hydrogen embrittlement and theoretical modeling of hydrogen accelerated fatigue crack growth
… loading tests and uniaxial stress-controlled ratcheting tests of a low carbon steel, JIS SM490YB, in the absence and presence of hydrogen. From the combined experimental data and calibrated Chaboche model, we may conclude that hydrogen decreases the yield stress and the amount of cyclic …
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Design by analysis of a fixed tube sheet heat exchanger subject to in-phase proportional loading
… to cyclic plasticity after showing some initial ratcheting behaviour under multilinear kinematic model. Under this material model, magnitude of plastic strains are small and are confined within surrounding elastic media, this has been proved by existence of elastic core. It is also shown that, …
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Experimental and modelling studies of pit-to-crack transition under corrosion fatigue conditions
… has been developed to simulate local fatigue ratcheting around the pit up to large strain levels. An approximate value for the plastic strain level at crack initiation was experimentally determined using electron backscatter diffraction (EBSD) techniques. Given the critical strain level, the …
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Development of a Novel Cam-based Infinitely Variable Transmission
… Infinitely Variable Transmission of the ratcheting drive type is presented. There are several categories of CVTs in existence today, including traction, belt, and ratcheting types. Drives of these types, their attributes, and associated design challenges are discussed to frame the …
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Hypersonic Hype: An Analysis of the Emerging Sino-American Arms Race in the Pacific
… Both countries would be better served by ratcheting down arms development as I prove using established political theory and the claims of top American military and political officials.
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Transfer rna dynamics and transfer-messenger rna accommodation in bacterial ribosomes at the single-molecule level
… can be correlated to spontaneous ribosomal ratcheting. Monitoring tmRNA entrance and accommodation was also studied at the single-molecule level. The data reveal that the accommodation of tmRNA occurs in a multistep process, in which three major FRET states are present. The low FRET state …
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Performance and Cost Analysis of a Structured Concrete Thermocline Thermal Energy Storage System
… such TES system introduces the issue of thermal ratcheting and rupture of the tank's walls. To address this issue, it has been suggested that structured concrete be used in place of the aggregate bed. Potential concrete mix designs have been developed and tested for this application. …
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Chemomechanical coupling and motor cycles of the molecular motor myosin V
… stall force of the motor, myosin V exhibits a 'ratcheting' behaviour: For loads in the direction of forward stepping, the velocity depends on the concentration of ATP, while for backward loads there is no such influence. Based on the chemical states of the motor, we construct a general network …
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Multi-Hazard Modelling of Dual Row Retaining Walls
… collapse and only accrued deformation in a ratcheting fashion. The experiments and numerical simulations highlighted the importance of relative suction between the walls, shear-induced dilation and regained strength outside the walls and partial drainage in the co-seismic period. The use of …
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Performance of Silty Sands and their Use in Flexible Airfield Pavement Design
… the transitions between elastic, plastic, and ratcheting failure behaviours (i.e. shakedown boundaries), commonly used to help predict the lifespan of a flexible pavement, were examined. It was seen that cycling a silty-sand, the stress path and yield surface could change depending on the fines …
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Auditing Outside the "GAAP": The Association Between Non-GAAP Reporting and Audit Quality
… by risk-pricing non-GAAP measures, but are not ratcheting up effort to enhance audit quality. While it is unlikely that this study will settle the ongoing debate as to whether auditors should be required to provide assurance of non-GAAP measures, the findings may provide insights to regulators, …
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