자료유형  

 학위논문

Control Number  

0016932715

International Standard Book Number  

9798379842383

Dewey Decimal Classification Number  

600

Main Entry-Personal Name  

Kedir, Nesredin.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2021

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2021

Physical Description  

1 online resource(175 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: A.

General Note  

Advisor: Chen, Weinong W.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2021.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Silicon based ceramics and ceramic matrix composites (CMCs) are materials with a capacity to replace current metallic components in the hot-section of gas turbine engines. These materials enable higher gas turbine inlet temperatures, and this leads to decreases in both fuel consumption and greenhouse gas emissions. To date, only static CMC components have been implemented successfully. Attempts to transition rotating components have been unsuccessful primarily due to failures from impact damage by ingested or internally spawned foreign object debris (FOD).This dissertation investigates the applicability of high intensity pulsed synchrotron X-ray radiography for in situcharacterization/visualization of FOD impact at high temporal and spatial resolutions. Previous FOD impact studies relied on post-impact strength evaluations and/or postmortem fractography to establish damage mechanisms. These approaches fail to provide any information on the damage kinetics and in some cases lead to erroneous interpretations of damage.In this effort, the facility for in situ experiments is initially established and three studies are conducted to evaluate the capability. The first study is a baseline in which silicon carbide (SiC) ceramic specimens are subject to FOD impact by spherical projectiles of partially stabilized zirconia (PSZ), silicon nitride (Si3N4), and steel. As an extension, the second study investigates the effect of an air plasma sprayed silicon/mullite environmental barrier coating (EBC) layer on the FOD impact response of SiC specimens by PSZ and Si3N4 projectiles. EBCs are prime reliant for thermochemical protection in gas turbine environments and very little is known about their damage tolerance under FOD impact. The third and final study, considers FOD impact in narrow SiC specimens with and without EBCs, by PSZ, Si3N4, and steel projectiles. Narrow specimen geometries mimic low curvature segments in ceramic gas turbine blades.The results from all three studies indicated the exceptional capability of pulsed synchrotron X-ray radiography for characterizing damage kinetics during FOD impact. Damage histories showing multiple crack initiation and propagation in the ceramic, as well as penetration, ejecta formation, and delamination in the EBC, were retrieved. This transient data is extremely valuable for constructing reliable numerical FOD impact models and accurate life prediction of ceramic components. Additionally, the EBC layer and specimen geometry were found to control the level of damage in the SiC ceramic. For the EBC itself, the extent of damage was determined to depend mainly on projectile hardness and impact energy.

Subject Added Entry-Topical Term  

Metals.

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Raw materials.

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Plasma.

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Failure.

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Greenhouse gases.

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Spectrum analysis.

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Grain boundaries.

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Emissions.

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Electricity distribution.

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Carbon.

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Chemical vapor deposition.

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Crack initiation.

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Hot pressing.

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Microstructure.

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Impact strength.

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Gas turbine engines.

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Energy consumption.

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High speed.

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Ceramics.

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Industrial plant emissions.

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Radiography.

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Corrosion.

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Analytical chemistry.

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Atmospheric sciences.

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Chemistry.

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Climate change.

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Energy.

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Materials science.

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Mechanical engineering.

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Medical imaging.

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Optics.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 85-01A.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:643534