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 304 for “"mechanical response"”.
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Modeling the Mechanical Response of Polycrystalline Thin Films
Microelectromechanical systems (MEMS) are part of every modern technological advance. Electrodeposited thin nickel (Ni) polycrystalline films in MEMS often show fiber texture resulting in transverse isotropic elastic properties. It is of interest to determine these elastic properties, in particular …
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Thermal and Mechanical Response of Curved Composite Panels
… applications. An understanding of structural response at elevated temperatures is required for anticipated future high speed aircraft applications. This study concentrates on the response of unstiffened, curved composite panels subjected to combinations of thermal and mechanical loading …
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Reliability of Tibial Measurement with Mechanical Response Tissue Analysis
Mechanical response tissue analysis (MRTA) provides a noninvasive means of estimating the cross-sectional bending stiffness (EI) of long bones, and thus can serve as a predictor of bone strength. Estimates of bone bending stiffness are derived from the point impedance response of a long bone to low …
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Mechanical response of unidirectional Boron/Aluminum under combined loading
… test methods were employed to characterize the response of unidirectional Boron/Aluminum metal matrix composite material under monotonic and cyclic loading conditions, namely: Iosipescu Shear, Off-Axis Tension and Compression. The characterization of the elastic and plastic response includes the …
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ELECTRO-OPTICAL AND ELECTRO-MECHANICAL RESPONSE OF FERROELECTRIC NEMATIC FLUIDS
… concerning various electro-optical and electro-mechanical properties of the NF phase of RM734, the first reported ferroelectric nematic mesogen. First, the surface alignment of RM734 has been explored upon confining it into flat cells, realized with various rubbed and unrubbed surfaces, proving …
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Assessing the Mechanical Response of Pavements During and After Flooding
… analysis to</p> <p>(1) investigate the pavement response to traffic loads under different moisture conditions,</p> <p>(2) identify the important parameters that affect the performance of inundated pavements,</p> <p>(3) investigate the influence depth of the subsurface water level at which the …
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Mechanical response of spring films under compression and shear loading
… assess the effect of geometric parameters on the mechanical response. Si springs of either 4 or 10 coil turns were deposited on unseeded and seeded Si wafers with seed spacing of 900 nm or 1500 nm. The Cu springs had 10 coil turns and were deposited on silicon wafers with 2000 nm, 2400 nm, 2800 …
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Tailored Mechanical Response of 3D Microgranular Crystals with Hierarchical Architecture
… sought to engineer granular systems with tunable mechanical responses, though few have begun to realize them as functional architected materials. Here, we introduce a two-level architected granular framework that programs spherical microgranular media across both grain-level (ellipsoidal …
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Computational Studies of the Mechanical Response of Nano-Structured Materials
… and capillary forces on the deformation response of bicontinuous metallic composites and porous materials. This research utilizes atomistic scale modeling to study nanoscale deformation phenomena with time and spatial resolution not available in experimental testing. Molecular dynamics …
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Mechanical response of polymer matrix composites using indentation stress-strain protocols
… due to their potential to combine critical mechanical properties with a high strength-to-weight ratio necessary for advancing automotive and aerospace applications. Such materials have been studied extensively for their bulk properties as well as the properties of their individual …
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Evaluation of foam concrete physical properties and mechanical response under indentation
… of its key material attributes to the mechanical especially crushing performance. In this dissertation, several critical aspects of the mechanical performance of lightweight foam concrete are investigated using a series of advanced characterization techniques, as well as computational …
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Large-scale simulation of the mechanical response of porcine cranial bone
… models is the ability to accurately capture the response of the individual tissues comprising the anatomy under study. In this thesis, we presented a simulation-based approach to describe the stress-strain response of cranial bone in mammals that can be applied to animal studies for model …
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An Instrument for the Measurement of Soft Material Nonlinear Mechanical Response
… diagnostics where understanding material mechanical response is crucial for precision design. Traditional methods for measuring nonlinear mechanical properties of soft materials require specially sized samples that are extracted from their natural environment to be mounted on the testing …
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Reliability and Validity of Mechanical Response Tissue Analysis in Composite and Human Tibiae
… approaches to improving the reliability, of mechanical response tissue analysis (MRTA). Twenty composite tibiae underwent MRTA testing on three separate days to determine intra- and inter-day reliability of bending stiffness. The bones were then subjected to three-point bending tests to …
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Hydraulic properties of subglacial sediment determined from the mechanical response of water-filled boreholes
… properties. A numerical model describing the mechanical response of an unconnected borehole and the bed beneath it to this freezing forcing was developed, using a non-linear transient viscoelastic ice rheology and an approximate model of top-down freezing. The resulting system of equations was …
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Micromachined Sensors and Their Applications in the Study of Mechanical Response of Single Living Cells
… have been used to study the mechanobiological response of fibroblasts, endothelial cells, and neurons. The major findings of the studies include: The force response of monkey kidney fibroblasts is strongly linear, reversible and repeatable under large deformations, with a small stiffening at …
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Analysis of the mechanical response of LMFBR fuel clads subjected to in-service property variations
… diffusion induced mass transfer, and a host of mechanical influences constitute the complex environmental variables responsible for the degradation. The degradation could occur in the bulk of the clad or through its thickness depending on the component of the environment and the reactor …
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Investigation of induced thermo-mechanical response and cure kinetics during processing of carbon fiber reinforced plastics.
The manufacture of laminated composite materials using a thermosetting resin matrix is a complex process that can be understood with a knowledge of cure kinetics, heat transfer, and structural mechanics. During laminate manufacture, reinforcing fibers are impregnated with resin and subjected to …
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Mechanical response of polyether polyurethane foams under multiaxial stress and the initial yielding of ultrathin films
In the first part of this thesis, we study the mechanical response of elastic polyether polyurethane (EPP) foams by means of experiments, theory, and modeling. The experiments include five loading cases: uniaxial compression along the rise direction; uniaxial compression along two mutually …
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