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 172 for “"Material property"”.
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Automation of electrostatic material property measurement procedures
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Material property extraction procedure for electromomentum coupled metamaterials
Electromomentum (Eμ) coupling is a material response that couples the macroscopically observable time-varying electric field to the momentum of the material. This unique behavior has been shown theoretically to result from dynamics at subwavelength length-scales due to asymmetries in heterogeneous …
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Electrostatically actuated microelectromechanical test structures for material property measurement
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Material Property Modeling of Ground Tire - Recycled Polymer - Natural Fiber Composite
… provides an opportunity to add value to disposed material. Thermoplastic material studied herein is primarily recycled linear low-density polyethylene (RLLDPE) from agricultural films with 10% being virgin LLDPE. The agricultural plastic obtained from scrap grain bags contain naturally oxidized …
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The effects of material property changes on solar collector thermal performance
… the analysis is to develop methods of relating material property changes to full scale collector efficiency changes after exposure to environmental and operational conditions. To this end, results of material sample and full scale collector tests are discussed separately and then related to each …
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Predicting the Effects of Dimensional and Material Property Variations in Micro Compliant Mechanisms
… has inherent variation that leads to uncertain material and dimensional parameters. To obtain accurate and reliable predictions of mechanism behavior, the effects of these variations need to be analyzed. This thesis expands already existing tolerance and uncertainty analysis methods to apply to …
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Structural Characterization and Material Property Evaluation in Polymer-Derived SiOC Ceramics and Ceramic Nanocomposites
… temperature- and corrosion-resistant materials for aerospace, energy, and electronics sectors. Polymer-derived ceramics (PDCs) and specifically polymer-derived silicon oxycarbide (SiOC) are a promising and attractive material class to accommodate the need for novel ceramics with …
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The scattering of sound waves in two-dimensional ducts with discontinuities in height and material property
Eigen-mode matching techniques offer a versatile approach for solving acoustic scattering problems in ducts. However, until recently, these techniques have been restricted to problems in which the boundary conditions contain at most one derivative, that is, Neumann, Dirichlet or Robin's conditions. …
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The effect of material property variations on the failure probability of an AGR moderator brick subject to irradiation induced self stress
… the brick is affected by the variations in the materialproperties of the graphite used for the brick and this is alsoexamined, developing a statistical approach to the analysis.Property variations between bricks are considered but no allowancehas been made for material property variations within …
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Interdigital dielectrometry sensor design and parameter estimation algorithms for non-destructive materials evaluation
… nondestructive measurement of non-homogeneous material property profiles with fringing electric field dielectrometry sensors. The instrumentation includes interdigital sensors and sensor arrays, other types of fringing field sensors, electronic circuit boards for measurement of sensor signals, …
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Probabilistic aerothermal design of gas turbine combustors
… to estimate the combustor life distribution. The material property and liner temperature variations accounted for approximately 80 percent and 20 percent, respectively, of the combustor life variability. Furthermore, the typical combustor life was found to be approximately 20 percent less than the …
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Field observations of the early-age behavior of jointed plain concrete pavements
… found controlled by slab temperature history, material property development and frictional resistance. Minimal recommendations for corrects to the behavior were suggested.;The scope of the Phase II investigation was to perform extensive, continuous monitoring of the behaviors of newly …
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New Computational Methodologies for Microstructure Quantification
… physics-based and data-driven methods for material property prediction for metallic microstructures while indicating the context and benefit for microstructure- sensitive design. From this, the use of shape moment invariants is offered as solution to quantifying microstructure topology …
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A combined experimental and stochastic finite element analysis methodology for the probabilistic fracture behavior of composite laminates
… analysis methodology that can incorporate the material property variabilities and based on these, predict the stochastic characteristics of the Stress Intensity Factor (SIF) and the Strain Energy Release Rate (G) of composite laminates, is developed. Using this methodology, the probabilistic …
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Advanced Testing and Characterization of Transportation Soils and Bituminous Sands
Based on the individual databases, material property correlations and characterization models were developed for the soil and oil sand samples using the applied stress states, loading frequency, temperature and bitumen content as variables. The correlations and models may be used as practical …
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Fundamental Study of the Machinability of Carbon Nanotube Reinforced Polymer Composites
… CNTs in the polymer matrix is important from a material property improvement stand point. Therefore, a microstructure-based finite element machining model was used to study the effect of CNT orientation on the machining responses. The predicted machining responses for aligned CNT composites …
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Variability in the Debitage of the Early Holocene Lithic Assemblages of the Sanders (45KT315) Site
… technological, functional, and raw tool stone material property dimensions. This thesis identifies the extent that debitage could be used to address variability between the Lower Lithic Component (LLC) and the Middle Lithic Component (MLC). The results of the analysis were compared to …
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An Experimental Investigation of Structural Composite Lumber Loaded by a Dowel in Perpendicular to Grain Orientation at Yield and Capacity
… ratio of the main member, and the main member material. Southern pine machine-stress-rated (MSR) lumber, laminated veneer lumber (LVL), and parallel strand lumber (PSL) were the three material types included in the program. Experimental results were compared with theoretical predictions from …
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A model for the long-life fatigue behavior of small notches
… vs. $\Delta$K$\sb{\rm eff}$ relation is a unique material property independent of crack length. The variation of crack closure level with crack length for a crack emanating from a notch was found to depend on the material properties, the notch size, the notch acuity, and the applied load …
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A study of tension, compression, and shear test methods for advanced composites
… to test methods for advanced composite materials has been carried out. Several test methods were discussed and compared for each of three areas of interest. These areas were uniaxial tension, uniaxial compression and in-plane shear. Test methods were selected for tension, compression and …
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