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USE OF SINGLE TOW CERAMIC MATRIX MINICOMPOSITES TO DETERMINE FUNDAMENTAL ROOM AND ELEVATED TEMPERATURE PROPERTIES

Almansour, Amjad Saleh Ali
http://orcid.org/0000-0001-9581-6456
http://rave.ohiolink.edu/etdc/view?acc_num=akron148640184494135

Abstract Details

2017, Doctor of Philosophy, University of Akron, Mechanical Engineering.
The room and high temperature mechanical properties of continuous ceramic fiber reinforced matrix composites makes them attractive for implementation in aerospace and nuclear applications. However, the effect of fiber content has not been addressed in previous work. Therefore, single tow composites with fiber content ranging from 3 to 47 % was studied. Single fiber tow minicomposite is the basic architectural feature of woven and laminate ceramic matrix composites (CMCs). An in depth understanding of the initiation and evolution of damage in various ceramic fiber reinforced minicomposites with different fiber volume fractions and interphases was investigated employing several non-destructive evaluation techniques. A new technique is used to determine matrix crack content based on a damage parameter derived from speed of sound measurements which is compared with the established method using cumulative energy of Acoustic Emission (AE) events. Also, a modified theoretical model was implemented to obtain matrix stress at the onset of matrix cracking. Room temperature tensile, high temperature creep rupture and high temperature oxidation degradation loading conditions were all considered and composites’ constituents were characterized. Moreover, fibers/matrix load sharing was modeled in creep and fiber volume fraction effect on load transfer was investigated using derived theoretical models. Fibers and matrix creep parameters, load transfer model results and numerical model methodology were used to construct minicomposites’ creep strain model to predict creep damage of the different fiber type and content minicomposites. Furthermore, different fiber volume fractions ceramic matrix minicomposites’ electrical resistivity temperature dependence isn’t well understood. Therefore, the influence of fiber content, heat treatment cycles and creep on electrical resistivity measurements of SiC/SiC minicomposites were also studied here. Next, minicomposites’ testing and characterization methodology was used to screen and characterize slurry-derived mullite bond coated minicomposites for enhanced oxidation and creep resistance. Finally, this study shows valuable testing methodologies and models approach for use in screening, developing and improving new generation ceramic matrix composites.
Gregory Morscher, Dr (Advisor)
Tirumalai Srivatsan, Dr (Committee Member)
Craig Menzemer, Dr (Committee Member)
Alper Buldum, Dr (Committee Member)
Kwek Tze Tan, Dr (Committee Member)
Robert Goldberg, Dr (Committee Member)
Manigandan Kannan, Dr (Committee Member)
220 p.
Acoustics; Aerospace Engineering; Aerospace Materials; Chemical Engineering; Chemistry; Electrical Engineering; Engineering; Experiments; High Temperature Physics; Materials Science; Mathematics; Mechanical Engineering; Mechanics; Metallurgy; Theoretical Mathematics; Theoretical Physics
Minicomposites,CMCs,Velocity of Sound, Creep, Creep Modelling, Creep Damage Characterization, Failure Analysis, Acoustic Emission, Electrical Resistance, Environmental Barrier Coating, EBC, CVI-SiC Creep, SiC Fibers Creep, Stress Dependent Matrix Cracking

Recommended Citations

Citations

  • Almansour, A. S. A. (2017). USE OF SINGLE TOW CERAMIC MATRIX MINICOMPOSITES TO DETERMINE FUNDAMENTAL ROOM AND ELEVATED TEMPERATURE PROPERTIES [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron148640184494135

    APA Style (7th edition)

  • Almansour, Amjad. USE OF SINGLE TOW CERAMIC MATRIX MINICOMPOSITES TO DETERMINE FUNDAMENTAL ROOM AND ELEVATED TEMPERATURE PROPERTIES. 2017. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron148640184494135.

    MLA Style (8th edition)

  • Almansour, Amjad. "USE OF SINGLE TOW CERAMIC MATRIX MINICOMPOSITES TO DETERMINE FUNDAMENTAL ROOM AND ELEVATED TEMPERATURE PROPERTIES." Doctoral dissertation, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron148640184494135

    Chicago Manual of Style (17th edition)

akron148640184494135
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© 2017, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.