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 64 for “"Materials -- Testing"”.
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Exploring property driven design fabrication through materials testing and software development
… property prototypes from a limited array of materials. In this project, we explore a different approach to layer manufacturing, namely, a layered manufacturing product that, while using a single material, produces an entity of varying material properties. Materials testing of PMC®-724 …
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Design fabrication and calibration of MEMS actuators for in-situ materials testing
… Nickel (Ni) and Gold (Au) are popular thin film materials used in MEMS/NEMS. Various studies have been conducted in recent years to study the mechanical properties of freestanding thin films in situ in TEM to study their failure mechanisms. Some of these studies utilize MEMS devices as actuators. …
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Microprocessor-based system for the detection and characterization of acoustic emissions for materials testing
… time. The AEDCS is designed to be used in the AE testing of materials. It is well-suited for non-destructive applications that produce a relatively low AE count rate, such as AE monitoring of wooden structures. The AEDCS is also capable of recording AE event characteristics in destructive test …
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Development and proving of a split Hopkinson pressure bar used for high strain rate materials testing
… screw-driven or servo-hydraulic methods of testing materials at high strain rates are not adequate as oscillations and stress waves are set-up within the testing apparatus. These oscillations and stress waves foul the transducer reading, thus making the data obtained unusable. To overcome …
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Design, construction, and commissioning of an in-core materials testing facility for slow strain rate testing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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System and Reactor Design, and Materials Testing, for Efficient Thermochemical Solar Fuel Production in Temperature/Pressure Swing Redox Cycles
… heat transfer in reactors having porous redox materials have low optical thickness, highly anisotropic scattering and non-uniform morphology. Our method GREENER (Generalized Radiation ExchangE factors and NEt Radiation method) achieves the same accuracy as Monte Carlo Ray Tracing with several …
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Materials testing and development of functionally graded composite fuel cladding and piping for the Lead-Bismuth cooled nuclear reactor
… and piping material. A series of tests and materials analysis were performed on the composite piping material. These tests / analysis included microstructural characterization, heat treatment optimization, creep and tensile testing, diffusion testing, and long term static corrosion tests. …
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Design optimization and analysis of a fluoride salt cooled high temperature test reactor for accelerated fuels and materials testing and nonproliferation and safeguards evaluations
… irradiation facility for accelerated fuels and materials testing. The first stage of the present work included an exploration and characterization of the available design space for an FHTR. Many different core, reflector, and assembly designs were evaluated to determine configurations that …
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An exact plane-stress solution for a class of problems in orthotropic elasticity
… Two load cases similar to those encountered in materials testing are investigated using the solution. The solution method developed is seen to have potential uses in stress analysis of composite structures.
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In-situ investigation of the oxidation kinetics of Fe-12Cr-2Si using time-resolved transient grating spectroscopy
… applications is limited by the speed at which materials may be tested. In particular, there exist few methods by which the thermal, mechanical, and structural properties of materials may be monitored in conditions that are dynamically changing their microstructure. These conditions, such as …
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Iterative Learning Control for Precision Motion Control of Microscale and Nanoscale Tracking Systems
… may change rapidly such as in micro- and nano-materials testing. The time-frequency ILC is applied to a 3-DOF piezo driven flexure stage yielding 4x higher bandwidth over the original feedback controller and achieving 1500 Hz tracking bandwidth during critical partitions of a given trajectory.
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The development and application of the load-stroke hysteresis technique for evaluating fatigue damage development in composite materials
… and stroke signals of a standard servo-hydraulic materials testing system. The method was used to characterize changes in properties and performance induced by long-term cyclic loading. Advantages of the load-stroke hysteresis loop include: (1) the fact that contact with the specimen is not …
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Design and fabrication of a modular multi-material 3D printer
… In addition, the simultaneous use of multiple materials in 3D printing has not been extensively explored. The printer presented in this thesis was developed to address these shortcomings. The printer features a low-cost high-performance design largely using commercial off-the-shelf parts. …
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Design and Development of a Novel Expanding Pedicle Screw for Use in the Osteoporotic Lumbar Spine
… were built on a rapid prototype machine. A materials testing machine performed axial load to failure tests in both Sawbones and cadaveric specimens comparing the new design to traditional screws (rate = 10mm/min to 20 mm). Output parameters included yield load, ultimate load, stiffness, …
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Mechanical testing of solid materials at the micro-scale
… experimental data on the mechanical behavior of materials at that scale. Generation of experimental data requires accurate, robust, reliable, versatile and yet simple micro-scale mechanical testing devices. This thesis describes the design, development and applications of materials testing …
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Nanomechanical systems with small dissipation
… are surface chemical engineering, alternative materials testing, and geometric optimization through nanofabrication. Reduction in non-contact friction between a vibrating nanomechanical resonator and a surface, spaced nanometers away from the latter, was achieved by using a diamond nanowire as …
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Software tools for computer-controlled fatigue testing
… Generation software, the response of the Materials Testing System was investigated for distortion and attenuation. In particular, the effect of the resolution of the waveform on the test system response was noted. There was negligible attenuation for full scale frequencies of up to 20 Hz. …
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Design of a Cyclic Sliding, Dynamically Loaded Wear Testing Device for the Evaluation of Total Knee Replacement Materials
… to seven times body weight. However, most wear testing machines that have been used to evaluate total knee replacement materials are unidirectional and/or apply only static force. This thesis presents an alternate wear testing device capable of simulating the most prevalent motions of the knee, …
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Oxidation catalyst degradation in the exhaust stream of a large bore 2-stroke natural gas engine
… This work combines laboratory and field testing of an oxidative catalyst designed for lean burn natural gas engines. Catalyst performance is tracked over the course of a year to examine the rate and cause of degradation. The oxidation catalyst was housed in a slipstream in the exhaust …
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Modeling of materials with internal variables using a thermomechanical approach
… the physical essence of constitutive behavior of materials. Based on this approach, a one-dimensional constitutive model for the two-way shape memory effect and a one-dimensional constitutive model for piezoceramics have been developed, respectively. In modeling the two-way shape memory effect, a …
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