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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1301

Обработка давлением в технологиях производства изделий аддитивными методами 3D печати : магистерская диссертация / Pressure treatment in technologies for the manufacture of products by additive 3D printing methods

Грехов, С. К., Grekhov, S. K. January 2020 (has links)
Приведен обзор случаев использования изделий, изготовленных по аддитивной технологии для имплантации. Проанализирован международный стандарт на испытания пористых материалов, изготовленных по аддитивной технологии. Выявлены проблемы и предположительные пути их решения при использовании изделий, изготовленных аддитивным методом из сплавов на основе титана. решена краевая задача определения напряженно-деформированного состояния ячеистого имплантат методом конечных элементов в программном модуле ABAQUS. Рассмотрен вопрос влияния геометрии ячеек испытываемого материала на механические свойства конечного изделия для трех различных форм ячеек. Рассмотрен вопрос влияния трения между испытываемой заготовкой и бойками испытательной машины на свойства конечного изделия при различных уровнях трения. / An overview of the cases of using products made using additive technology for implantation is given. The international standard for testing porous materials manufactured by additive technology is analyzed. The problems and possible ways of their solution are revealed when using products manufactured by the additive method from titanium-based alloys. the boundary value problem of determining the stress-strain state of a cellular implant by the finite element method in the ABAQUS software module has been solved. The question of the influence of the geometry of the cells of the test material on the mechanical properties of the final product for three different cell shapes is considered. The question of the influence of friction between the tested workpiece and the strikers of the testing machine on the properties of the final product at various levels of friction is considered.
1302

Anisotropy Evolution Due to Surface Treatment on 3D-Printed Fused Deposition Modeling (FDM) of Acrylonitrile Butadiene Styrene (ABS)

Lozinski, Blake E 01 January 2017 (has links)
Purpose: This paper will present insight to the methodology and results of the experimental characterization of Acrylonitrile Butadiene Styrene (ABS) using Fused Deposition Modeling (FDM). The work in this research explored the effects of print orientation, surface treatment, and ultraviolet (UV) light degradation with the utilization of Digital Image Correlation (DIC) on ABS tensile specimens. Design/methodology: ABS specimens were printed at three build orientations (flat (0 degrees), 45 degrees, and up-right (90 degrees)). Each of these specimens were treated with three different surface treatments including a control (acrylic paint, Cyanoacrylate, and Diglycidyl Bisphenol A) followed by exposure to UV light to the respective batches. This experiment design will provide tensile direction properties with the effect of thermoset coatings and UV degradation. Dogbone FDM specimens based on ASTM standard D638 type IV were printed on a Stratasys Dimension SST (Soluble Support Technology) 1200es 3D Printer and loaded into a MTS Landmark Servohydraulic Test Systems. Analysis was preformed on the fracture section of the tensile specimens utilized DIC and comparing Ultimate Tensile Strength (UTS) and Ultimate Fracture Strength (UFS). Findings: From the results UV light did not play a large factor in the strength of the specimens. The print orientation showed the largest anisotropic behavior where some specimens experienced as much as a 54% difference in ultimate tensile strength. Thermoset coated specimens experienced a maximum of 2% increase in strength for the Cyanoacrylate and Diglycidyl Bisphenol A specimens where the acrylic paint and natural did not. Several findings were of value when looking at the stress strain plots. Originality/value: This paper provides knowledge to the limited work on print build orientation, thermoset coatings and, UV light on ABS specimens. Very little to no work has been done on these three properties. This paper can serve as the foundation of future work on external applications on ABS plastics.
1303

Nanosecond Electric Modification of Order Parameters

Borshch, Volodymyr 21 November 2014 (has links)
No description available.
1304

Separating, correlating, and exploiting anisotropic lineshapes for NMR structure determination in solids

Walder, Brennan J. 20 May 2015 (has links)
No description available.
1305

Integrated Magnetic Components for RF Applications

Hussaini, Sheena 03 June 2015 (has links)
No description available.
1306

Multifunctional Laminated Composites for Morphing Structures

Chillara, Venkata Siva Chaithanya 13 September 2018 (has links)
No description available.
1307

Beyond Speciation: A Study of Modifier Cation Clustering in Silicate Glasses by <sup>29</sup>Si Magic Angle Flipping NMR

Sanders, Kevin Joseph 27 September 2013 (has links)
No description available.
1308

Connectivity, Doping, and Anisotropy in Highly Dense Magnesium Diboride (MgB2)

Li, Guangze 16 September 2015 (has links)
No description available.
1309

Frictional Anisotropy of Graphene and Graphene Based Materials

Barabanova, Liudmyla 10 June 2016 (has links)
No description available.
1310

Energetically and Kinetically Driven Step Formation and Evolution on Silicon Surfaces

Nielsen, Jon F. 11 October 2001 (has links)
No description available.

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