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Microstructure-property relaltionship in silicon carbide armor ceramics
Descriptive
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Title
Microstructure-property relaltionship in silicon carbide armor ceramics
Name
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Demirbas
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Memduh Volkan
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Memduh Volkan Demirbas
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author
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Haber
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Richard
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Advisory Committee
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Richard A Haber
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chair
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Niesz
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Dale
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Advisory Committee
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Dale E Niesz
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internal member
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Cannon
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W
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Advisory Committee
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W Roger Cannon
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internal member
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Pujari
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Vimal
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Advisory Committee
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Vimal K Pujari
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outside member
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Rutgers University
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Graduate School - New Brunswick
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theses
OriginInfo
DateCreated
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2008
DateOther
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2008-05
Language
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English
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electronic
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application/pdf
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text/xml
Extent
xix, 220 pages
Abstract
Defects are one of the factors that show a negative effect on the ballistic performance. Uniform microstructures with a low percentage of well distributed porosity could possibly demonstrate high ballistic strength; therefore, it is of interest to estimate the parameters that define the spatial arrangement of defects. This aspect of microstructures was investigated in a variety of silicon carbide ceramics ranging from off-density sintered samples to high density hot-pressed armor grade samples.
The spatial distribution of defects was examined by various techniques including nearest neighbor distance distributions, tessellation analysis, and pair correlation functions. Random distributions were observed for most of the samples with some degree of clustering. Hardness was selected as a mechanical property to correlate with microstructural findings. Hardness contour maps were constructed by indenting samples with a statistically significant number of indents per load to see the variation in terms of location. The large number of indents allowed for Weibull analysis to be used to examine the spread in the data and to test spatial variability. A high degree of correlation was obtained between microstructural parameters and hardness/Weibull modulus values. Smaller defect sizes and homogenous distribution of defects were shown to provide higher hardness values.
A sintered SiC tile was examined using ultrasound to determine high and low amplitude regions in C-scan image maps. Serial sectioning was performed on diced samples from these two regions. Although no significant difference was observed in terms of density and average defect size, statistical tests showed that the difference in the largest defect size detected in low amplitude and high amplitude regions was significant. Clusters of defects were also identified in the samples from the low amplitude regions. The signal loss that was observed in C-scans maps could partially be attributed to these results.
A particularly high degree of correlation was shown between average defect size, spatial distribution parameters and hardness data. These findings exhibit the strong effect of microstructure on the quasi-static properties and may affect ballistic performance.
The spatial distribution of defects was examined by various techniques including nearest neighbor distance distributions, tessellation analysis, and pair correlation functions. Random distributions were observed for most of the samples with some degree of clustering. Hardness was selected as a mechanical property to correlate with microstructural findings. Hardness contour maps were constructed by indenting samples with a statistically significant number of indents per load to see the variation in terms of location. The large number of indents allowed for Weibull analysis to be used to examine the spread in the data and to test spatial variability. A high degree of correlation was obtained between microstructural parameters and hardness/Weibull modulus values. Smaller defect sizes and homogenous distribution of defects were shown to provide higher hardness values.
A sintered SiC tile was examined using ultrasound to determine high and low amplitude regions in C-scan image maps. Serial sectioning was performed on diced samples from these two regions. Although no significant difference was observed in terms of density and average defect size, statistical tests showed that the difference in the largest defect size detected in low amplitude and high amplitude regions was significant. Clusters of defects were also identified in the samples from the low amplitude regions. The signal loss that was observed in C-scans maps could partially be attributed to these results.
A particularly high degree of correlation was shown between average defect size, spatial distribution parameters and hardness data. These findings exhibit the strong effect of microstructure on the quasi-static properties and may affect ballistic performance.
Note
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Ph.D.
Note
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Includes bibliographical references (p. 210-219).
Subject
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Topic
Ceramic and Materials Science and Engineering
Subject
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(authority = ETD-LCSH)
Topic
Silicon carbide
Subject
(ID = SUBJ3);
(authority = ETD-LCSH)
Topic
Armor
Subject
(ID = SUBJ4);
(authority = ETD-LCSH)
Topic
Ceramics
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17300
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ETD_784
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doi:10.7282/T31Z44R3
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ETD doctoral
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Copyright protected
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Open
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Memduh Demirbas
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Rutgers University. Graduate School - New Brunswick
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Non-exclusive ETD license
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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