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 26 for “"cyclic testing"”.
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Minimal Constraint and Precision Placement in Cyclic Testing of High Life-Cycle Products
… serves as a design guide to establish a physical testing mechanism to assess contact resistance degradation and physical wear over the lifespan of an electric connector. Data will then be collected on initial contact prototypes to characterize their performance. With this data, designs may be …
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Large-Scale Cyclic Testing and Development of Ring Shaped - Steel Plate Shear Walls for Improved Seismic Performance of Buildings
… analyses. Next, five large-scale, quasi-static, cyclic experimental tests were conducted in the Thomas M. Murray Structures Laboratory at Virginia Tech. The large-scale experiments validated the system performance and provided data on the boundary frame forces, infill panel shear deformation …
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Damping and flexural properties of prestressed concrete members subjected to reversed cyclic loading
… damping. Part two describes the reversed cyclic testing of prestressed concrete members: end moments were applied to the members to simulate earthquake loading, and measurements were made of stiffness and damping energy. An analytical method of obtaining moment - rotation curves for …
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Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
… adhesive in a wedge test geometry. Environmental testing consisted of static and cyclical exposure for 240 hours in three atmospheres: 1) 170°C, 2 torr; 2) -20°C; 3) 60°C, 70% relative humidity. Crack propagation arrested within 48 hours. The order of durability in static environmental tests for …
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Performance of Cross-Laminated Timber Panel-to-Panel Diaphragm Connections with and without Tension Straps
… of connections were subjected to monotonic and cyclic testing to characterize their behaviour in this loading direction. Tests were also done on steel tension straps in isolation and in combination with the four connections. It was found that the connections without tension straps can be relied …
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Measuring Liquefied Residual Strength Using Full-Scale Shake Table Cyclic Simple Shear Tests
<p>This research consists of full-scale cyclic shake table tests to investigate liquefied residual strength of #2/16 Monterey Sand. A simple shear testing apparatus was mounted to a full-scale one-dimensional shake table to mimic a confined layer of saturated sand subjected to strong ground …
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Neural Network Fatigue Life Prediction in Notched Aluminum Specimens from Acoustic Emission Data
… by previous researchers who used maximum cyclic loads of 4,000, 3,000, and 2,000 pounds at a stress ratio of R = 0.0 and a frequency of 1 Hz to perform the fatigue tests. For this research the cyclic load remained at 2,000 pounds, but an additional ten specimens were tested in order to …
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Elastoplastic response of unidirectional graphite/aluminum under combined tension-compression cyclic loading
A test fixture for combined tension-compression cyclic testing of unidirectional composites was designed and characterized using 606l-O aluminum specimens. The elastoplastic response of graphite/aluminum l5° off-axis and 90° specimens under tension-compression cyclic loading was subsequently …
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Hybrid simulation of steel frames with semi-rigid connections
… diagrams from the hybrid simulation and cyclic testing are presented. Finally, a phenomenological model based on the Bouc-Wen formulation is fitted to the moment-rotation data. The model is suitable for extensive parametric studies on the type of connection tested, to guide future large …
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Refinement of the Inverted T-Beam Bridge System for Virginia
… under monotonic loading. The study recommended cyclic load testing be carried out on this joint type, as well as a welded joint similar to those found in decked bulb-T systems. The research contained herein presents the setup and results of this testing. From the work it was found that the …
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Development and Validation of a Twelve Bolt Extended Stiffened End-Plate Moment Connection
… was conducted, which consisted of the full-scale cyclic testing of four end-plate moment connections. The intention of the testing was to develop and validate the design procedure, and prequalify a new twelve bolt configuration. A displacement-controlled loading protocol was applied according to …
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Monotonic and Cyclic Performance of Structurally Insulated Panel Shear Walls
… More recently, research has been focused on the cyclic and dynamic performance of shear walls. To the author's knowledge, no other research is reported in the literature on the cyclic performance of SIPS shear walls. It is important to understand and quantify the monotonic and cyclic response of …
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Monotonic and cyclic short-term performance of nailed and bolted timber connections
This paper presents the results of testing to determine the appropriateness of the seismic load duration factor and to investigate the possible effect of previous load history from cyclic loading on connection reserve capacity and ductility. The single shear nail and bolt connection types tested …
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Assessment of Perforated Unreinforced Masonry Walls Responding In-Plane
… URM walls responding in-plane. Pseudo-static cyclic testing of six full-scale pier-spandrel substructures and a two storey half-scale isolated perforated URM wall was conducted to investigate the variables which control spandrel failure mode and the influence of spandrel failure on the lateral …
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Assessment of the Cyclic Strain Approach for the Evaluation of Initial Liquefaction
… relationship between pore pressure ratio and cyclic shear strain, γc, make a compelling argument for using a strain-based approach. However, the cyclic strain approach has not yet been standardized for field evaluations. The primary objective of this thesis is to use published databases of 415 …
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Monotonic and Cyclic Performance of Light-Frame Shear Walls with Various Sheathing Materials
… shear walls subjected to monotonic and cyclic loading is the focus of this thesis. The sheathing materials investigated are oriented strandboard (OSB), hardboard, fiberboard, and gypsum wallboard. The objectives of this study were to (1) obtain and compare performance characteristics of …
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Seismic performance of an I-girder to inverted-T bent cap bridge connection
… and tested in two phases of quasi-static cyclic testing. The first phase was a horizontal load test phase, which simulated the effects of gravity and seismic loads on the entire test unit. The second phase was a vertical load test phase, which specifically focused on the positive and …
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Optimal Architectures for Electric Vehicle Fast Charging and Impacts on Grid and Battery Life
… Finally, experimental results from cyclic testing of Li-ion cells using the proposed evaluation methodology are provided to examine the effects of fast-charging protocols on battery lifetime.
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Multi-Scale Architecture-Driven Design of Ultra-Soft Conductive Composites for Flexible and Wearable Sensing Applications
… performance across bending, pressure, and cyclic testing. Second, hybrid silver nanowires (AgNW) and CNT-BBE sandwich structures were developed using spray-deposited interlayers to create tunable nanoscale conductive networks. Network density was controlled via deposition iterations, with …
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Full-Scale Shake Table Cyclic Simple Shear Testing of Liquefiable Soil
… previously observed, or in tabletop laboratory testing. The study detailed herein is a controlled laboratory test performed at full scale to allow for the measurement of field-scale index testing before and after cyclic loading. Testing was performed at the Parson’s geotechnical and Earthquake …
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