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 54 for “"stress measurement"”.
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Towards wearable stress measurement
Chronic psychological stress carries a wide array of pathophysiological risks, including cardiovascular and cerebrovascular diseases, diabetes, and immune dysregulation. An important step in managing stress, before it becomes chronic, is recognizing precisely when and where it occurs. This thesis …
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A Novel Approach to Residual Stress Measurement
<p> Residual stress is a topic of ever increasing concern in many industries and aspects of engineering. Existing methodologies for quantifying residual stresses have been proven effective, all with their respective drawbacks. This thesis provides an authentication of a novel strain measurement and …
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Mobile neutron sources for residual stress measurement
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Residual stress measurement in railroad car wheels
… on the fluctuations of the azimuthal residual stress in the tread of the wheel. This criterion is based on a maximum likelihood statistical analysis of data obtained from six different wheels as deterrmined by x-ray diffraction. Of these locations, the analysis showed the tread, and perhaps a …
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Dispersion Curve Estimation for Longitudinal Rail Stress Measurement
… reliable, non-destructive method for measuring stress in railroads and other similar structures without the need for a calibration measurement. Major limitations which have hindered previous techniques include sensitivity to boundary conditions, insensitivity to stress, and intolerance for …
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Investigation on elastic anisotropy on x-ray stress measurement.
Thesis: M.S., Massachusetts Institute of Technology, Department of Metallurgy, 1945
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Controlling plasticity in the contour method of residual stress measurement
… emerged as a promising technique for residual stress measurement in relatively large, thick and complex engineering components. The method involves making a cut in the sample of interest, measuring the subsequent relaxed deformation profile of the cut surface and using this profile to …
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Understanding stress measurement and adjustment in parents of premature infants
… and psychometric properties of the Parental Stressor Scale: Neonatal Intensive Care Unit (PSS: NICU) for measuring stress in parents of infants hospitalised in intensive care units across countries</b></p><p class="MsoNormal" style="line-height: normal; background-image: initial; …
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Stress measurement and development of zirconium diboride-silicon carbide ceramics
… properties and thermally generated residual stresses. Thermally generated stresses were measured using Raman spectroscopy as well as both neutron and x-ray diffraction. For 70 vol% ZrB₂ - 30 vol% SiC composites neutron diffraction revealed that the SiC phase was under ~880 MPa compressive …
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Ultrasonic stress measurement for evaluating the adequacy of gusset plates
… for gusset plates is determining the level of stresses carried in the plate. Present technologies are unable to evaluate the dead, live and residual stresses maintained in gusset plates. The goal of the research presented in this thesis is to improve the safety of highway bridges by developing …
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Thermo-mechanical stress measurement and analysis in three dimensional interconnect structures
… CTE mismatch between Silicon and Copper, thermal stresses are induced by various thermal histories from the device processing, and they have caused serious concerns regarding the thermal-mechanical reliability. Firstly, a semi-analytic approach is introduced to understand stress distributions in …
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High-Precision Stress Measurement in Thin Films for X-Ray Mirrors
… makes them susceptible to deformations caused by stress in their reflective coatings. Much research has been dedicated to figuring coated mirrors that have been deformed by their coatings and in creating low stress coatings. These coatings need to be stable over decades for the length of the …
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Development of Residual Stress Measurement for Concrete Pavements through Cantilevered Beam Testing
Knowledge of residual stresses is important in understanding and predicting a concrete pavement’s performance. However, there is not a standard test for residual stresses in pavements. Prior pavement research was inspired by the hole-drilling straingage method used in metals. This method involves …
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Residual stress measurement and structural integrity evaluation of SLM Ti-6Al-4V
The constant drive toward cleaner, more powerful and more efficient jet turbines in the aerospace industry has narrowed the gap between the aircraft performance envelope requirements and the material limits. The most advanced turbine engines are incredibly complex in design and the weight-saving …
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COMSOL finite-element analysis : residual stress measurement of representative 304L/308L weld in spent fuel storage containers
… time they will be viable for storing spent fuel. Stress corrosion cracking (SCC) is a concern in these canisters if they are exposed to an aqueous, chloride-containing film. Canisters are fabricated using a concrete overpacking, along with austenitic stainless steel on the inside which is welded …
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Residual stress evaluation of aluminium drill rods
… of an air abrasive centre hole (AACH) residual stress measuring facility as well as its use in an experimental study of residual stresses developed in extruded high strength aluminium drill rods. These drill rods were manufactured by Hulett Aluminium for the mining industry for surface drilling …
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The Coefficient of Earth Pressure at Rest and Deformation and Densification of Granular Soils Subjected to Static and Dynamic Loading
… mainly the series of oedometer test with lateral stress measurement, were conducted on Ottawa, Lake Michigan Beach, Niigata, and Toyoura sand. Reconstituted dry sand specimens were subjected to 7 different loading histories, and the maximum effective vertical stress was 341 kPa. Different …
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Detecting and Modelling Stress Levels in E-Learning Environment Users
… that can automatically measure a learner's stress using objective methods. This research is set to examine how an objective stress measurement model can be developed, to compute a learner’s cognitive and emotional stress automatically using mouse and keystroke dynamics. To ensure the …
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Development of Facilities for the Testing of Shear Stress Sensors
… constructed to enable development of novel shear stress measurement devices. Three facilities were designed, constructed and tested to progressively test the sensor: a calibration chamber to apply a mechanical shear stress under various temperatures and pressures, an impinging jet to test the …
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The stress and strain behavior of materials for energy storage and production
… specifically silicon and tin, and the surface stress changes of platinum, palladium, and rhodium catalysts for the oxygen reduction reaction of fuel cells. In the first section, silicon microstructuring is utilized in order to design structures that can withstand the large volumetric strains …
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