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 19 of 19 for “"Thermomechanical analysis"”.
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Thermomechanical analysis of innovative nuclear fuel pin designs
… considered for the Korean reactor OPR1400. The analysis of I&EC fuel with a modified version of FRAPCON-3.3 revealed that an uneven heat flux split between the outer and inner surfaces may develop which does not yield an optimal design. After optimization, it is found that excessive cladding …
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Thermomechanical analysis of rock asperity in fractures of enhanced geothermal systems
… characterized by statistical method and fractal analysis. The asperity heights and enclosed aperture heights are described by probability density function before cold water is pumped into fracture. Secondly, when water injection and induced cooling occurs, the thermomechanical analysis of single …
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Cure of aqueous phenol-formaldehyde resin at elevated water vapor pressures
… (DEA) was used to monitor the cure reaction, and thermomechanical analysis (TMA), swelling tests and scanning electron microscopy (SEM) techniques were used to characterize the final resin-network. Microdielectric results showed that as the water vapor pressure of the sy stem increases the time to …
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Surface acoustic wave probes for chemical analysis
… lines have been used as probes for chemical analysis. The interaction between matter adjacent to the SAW device surface and the propagating Raleigh wave caused measurable changes in the amplitude, phase and resonant frequency of the wave. The effectiveness of various electronic detection …
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DEVELOPMENT AND IN-SITU CHARACTERIZATION OF BI-LAYERED LAMINATED COMPOSITES FOR ENHANCED MOISTURE BARRIER PERFORMANCE
… diffusivity across the samples. Furthermore, a thermomechanical analysis was performed on two different GaN power MOSFETs by the application of different underfill and potting encapsulations to determine stresses and strains on the solder bumps.
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Wet-spinning and thermal analysis of collagen fibers incorporating hydroxyapatite in mixed and coated form
… HA solution formed by mixing HA in water. With Thermomechanical analysis, the highest breaking point temperature was obtained for the composite fibers and the least with pure collagen fibers. The HA coated collagen fibers had breaking point temperature between these two fibers. However, tensile …
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The effects of space radiation on a chemically modified graphite- epoxy composite material
… changes were observed. Dynamic-mechanical analysis demonstrated that the glass transition temperature was lowered by 50° F (28° C) after irradiation. Thermomechanical analysis showed the occurrence of volatile products generated upon heating of the irradiated material. The chemical …
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Aspects of Wood Adhesion: Applications of 13C CP/MAS NMR and Fracture Testing
… methods of characterization of neat PF (thermomechanical analysis, swelling studies) and measurements made using 13C CP/MAS NMR. These correlations were then utilized to characterize PF cured in the presence of wood. The use of 13C labeled PF allowed estimates of relative degrees of resin …
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Design of bulk nanocrystalline tungsten alloys via nano-phase separation sintering
… during the sintering cycle, as analyzed by thermomechanical analysis, electron microscopy and x-ray diffraction. In addition, control experiments are used to establish that the accelerated sintering is apparently accomplished from the combination of two features of the powders: (i) …
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Comparative Studies On Standard and Fire-Rated Gypsum Wallboards.
… scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermomechanical analysis (TMA), scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) were used to characterize and compare the materials. Various properties, such as the heat flow, weight loss, dimensional changes, …
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In-situ analysis of polymer film coats using AFM and thermal probe methods
The in-situ analysis of pharmaceutical solid dosage forms films is of great interest to pharmaceutical research, especially with the drive towards continuous processing compared to batch processing requiring either in-line or on-line analysis of pharmaceuticals. The size and shape of many solid …
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Design, Synthesis, and Characterisation of Metal–Organic Framework Crystal–Glass Composites (MOF CGCs)
… powder X-ray diffraction data and thermomechanical analysis show the suppression of thermal expansivity in each of these three crystalline MOFs when suspended within a ZIF 62 glass matrix. In particular, for the two flexible frameworks, the average volumetric thermal expansion (αV) …
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Thermomechanical Response of Shape Memory Alloy Hybrid Composites
… sonic fatigue, and acoustic transmission. A thermomechanical model is presented for analyzing such shape memory alloy hybrid composite (SMAHC) structures exposed to thermal and mechanical loads. Also presented are (1) fabrication procedures for SMAHC specimens, (2) characterization of the …
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ANALYSIS AND OPTIMIZATION OF LASER CUTTING PROCESS FOR STRUCTURAL STEELS
Laser cutting is a widely used technology for precision cutting of various materials, in-cluding mild structural steel. It involves the use of a high-powered laser beam to melt, burn, or vaporize the material, resulting in a clean and accurate cut. This doctoral thesis presents a comprehensive …
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Fundamental experiments on the response of solutions, polymers, and modified polymeric materials to electromagnetic radiation
… thermogravimetry-mass spectrometry (TG-MS), and thermomechanical analysis (TMA). The isothermal desorption of volatiles (150 - 165°C) could be monitored by either mechanical, dielectric, or gravimetric techniques. The mechanical experiments revealed two peaks for water: one a low temperature peak …
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Evolution of the structure and properties of thermomechanically-processed metallic glasses
… Increasing the MGs’ enthalpies through thermomechanical processing, a process typically termed rejuvenation, can provide large improvements in mechanical properties. Plastic-deformation processes induce large changes in structure; however, these processes are destructive and therefore …
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Drug release from pellets and matrices based on cellulose ethers.
… of the polymeric films were determined by thermomechanical analysis and used as a guideline to select the inlet air temperature m coating operation. The coating procedure was performed using Accela-Cota. Matrices were prepared either by direct compression or wet granulation. Compendial …
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Characterization of Pharmaceutical Materials by Thermal and Analytical Methods
… Analytical techniques, which include dielectric analysis (DEA), differential scanning calorimetry (DSC), and macro-photo-micrography. These techniques were used to establish a structure vs. property relationship with the United States Pharmacopeia (USP) standard set of active pharmaceutical …
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Design of Functional Polyesters for Electronic and Biological Applications
… resources into polymeric materials. Critical analysis of current research surrounding bisphenol-A replacements and ioncontaining segmented polyurethanes aided in identifying benchmark polymers, including limitations, challenges, and future needs. Structure-property-morphology relationships …