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 “"X-ray radiography"”.
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Studies on neutron diffraction and X-ray radiography for material inspection
… of the bio and structural materials, X-ray and neutron are widely used because of their distinctive usefulness in investigating different structures. X-ray radiography and neutron diffraction are two widely known non-destructive techniques for material inspection. Here we demonstrate the …
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Moisture transport in cementitious materials via x-ray radiography and PINN
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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Local liquid velocity measurement of trickle bed reactor using digitial industrial X-ray radiography
… is performed by combining Digital Industrial X-ray Radiography (DIR) and Particle Tracking Velocimetry (PTV) techniques. This work also make possible the development of three-dimensional (3-D) V<sub>LL</sub> measurements that can be taken in TBRs. Measurements taken through both the combined and …
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Investigation of alternative jet fuels in gas turbine combustion systems using x-ray radiography
… to conventional jet fuel. In this work, x-ray phase-contrast imaging is performed at 90,517 Hz on a combusting fuel spray in a realistic gas turbine combustor, allowing characterization of breakup process of fuel into ligaments and then individual droplets as it leaves a nozzle. This …
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NDT to characterize 3D printed concrete interlayer bonds
… experimental study applied four NDT methods (x-ray radiography, ultrasonic pulse velocity (UPV), vibration resonance, and multi-element array ultrasonics) to idealized, layered concrete specimens that simulate layers of a 3D printed structure. The bond interfaces in the samples were …
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Nondestructive inspection of load induced damage in fiber reinforced polyphenylene sulfide
… ultrasonic attenuation, acoustic emission, X-ray radiography, and edge replication, were applied to study the damage developed under quasi-static tension loading of this material. The C-scan, edge replication, and X-ray radiography tests were performed both initially and after intermediate …
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The effect of thickness on the fracture behavior of graphite/bismaleimede laminates with central circular holes
… development around the holes was studied using x-ray radiography. In general, the small holes created more damage than the large holes and the thin laminates were more susceptible to damage than the thick laminates. All notched specimens exhibited matrix cracking in the 90° plies around the hole …
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Fatigue behavior of notched carbon epoxy laminates during reversed cyclic loads
… Damage was evaluated with penetrant-enhanced X-ray radiography and Iaminate deply. Tensile and compressive residual strengths were measured at three stages of damage development. A recently developed nondestructive testing technique, Stress Pattern Analysis by Thermal Emission, was implemented …
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Damage development under compression-compression fatigue loading in a stitched uniwoven graphite/epoxy composite material
… edge replication, stiffness monitoring, X-ray radiography, residual compressive strength, and laminate sectioning. It was found that the manufacturing defect of inclined stitches had the greatest adverse effect on material performance. 0° and 90° specimen performances were generally the …
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Design and development of a 3D X-ray microscope
… response of an injection into real tissue. X-ray radiography, x-ray microscopy, and computerized tomography (CT) were identified as the most appropriate imaging techniques used for non-invasive imaging of opaque objects and an instrument was constructed, utilizing all of those techniques. The …
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Mechanical behavior and damage mechanisms of woven graphite-polyimide composite materials
… stiffness monitoring, penetrant-enhanced X-ray radiography, laminate deply, and residual strength measurement. Material properties of the woven graphite-polyimide were comparable to those of woven graphite-epoxy. Damage development in woven graphite-polyimide was quite different than in …
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Effect of cooling rate and stacking sequence on the fatigue behavior of notched quasi-isotropic APC-2 laminates
… the reduction in modulus, penetrant enhanced X-ray radiography, and Scanning Acoustic Microscopy (SAM). Post failure analysis of the specimens was carried out by Scanning Electron Microscopy (SEM). A quasi-3D Finite Element Analysis was performed to compare the differences in the interlaminar …
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Performance simulation of a composite orthopedic implant device
… tested. Among all the NDE techniques used, x-ray radiography and a surface replication technique were shown to be most effective qualitatively. Destructive tests were also performed on selected specimens, the results are complimentary to the information obtained from the NOE tests.
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An investigation of the excitation frequency dependent behavior of fiber reinforced epoxy composites during vibrothermographic inspection
… to interrogation by ultrasonic C-scans, X-ray radiography, and then compared with the vibrothermographic NDE.
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Mechanical behavior of a ceramic matrix composite material
… ultrasonic C-scans and penetrant enhanced X-ray radiography.
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Nondestructive evaluation of a high temperature ceramic matrix composite material
… All of the NDT techniques, except film X-ray radiography, were sensitive to changes in the ceramic matrix composite (CMC) caused by thermal ageing. Surface and sub-surface scanning acoustic microscope (SAM) micrographs indicated that the CMC specimens were experiencing surface changes. The …
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Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications
… and obtaining high energy yields for flash x-ray radiography using plasma or particles can be made easier through faster switches. One newly emerging technology is called the Linear Transformer Driver (LTD). These switches are becoming more commonly used in the solid-state domain. While gas …
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Characterization of short-pulse laser-produced fast electrons by 3D hybrid particle-in-cell modeling of angularly resolved bremsstrahlung
… (WDM), advanced fusion concepts, and intense x-ray radiation for probing complex high areal density objects and inertial confinement fusion (ICF) fusion cores. However, determining laser-driven fast electron characteristics, specifically, electron energy distribution, divergence angle, and …
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Characterization of battery anode materials by X-ray and electron-based imaging techniques
… density of Li batteries. In this dissertation, X-ray and electron-based imaging techniques were used to investigate the currently existing challenges that prevent the massive commercial deployment of silicon and lithium anodes. Firstly, in-situ and operando synchrotron X-ray radiography was …
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Using fusion-product spectroscopy to study inertial fusion implosions, stopping power, and astrophysical nucleosynthesis at OMEGA and the NIF
… ('no-coast'); combining these data with x-ray radiography reveals that the shock-bang time occurs anomalously late in these implosions relative to hydrodynamic simulations. By using multiple detectors, low-mode (~2) implosion asymmetries are measured. When compared to stagnation x-ray …
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