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01 Kollins Thesis Final 09072017.pdf (6.53 MB)

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Investigation of Residual Stresses in Melt Infiltrated SiC/SiC Ceramic Matrix Composites using Raman Spectroscopy

Kollins, Kaitlin Noelle
http://rave.ohiolink.edu/etdc/view?acc_num=wright1513591335033283

Abstract Details

2017, Master of Science in Materials Science and Engineering (MSMSE), Wright State University, Materials Science and Engineering.
Ceramic matric composites (CMCs) are being developed for use in extreme operating conditions. Specifically, there is interest to replace superalloys with Silicon Carbide/Silicon Carbide (SiC/SiC) CMCs in the hot section of gas turbine engines because of their lower densities, high temperature performance, and oxidation resistance. Residual stresses in SiC/SiC CMCs are a direct result of the high temperature processing conditions, a mismatch in the coefficients of thermal expansion between composite constituents, and silicon crystallization expansion upon cooldown. Understanding the residual stress state and magnitudes of these stresses will enable better prediction of behavior and life performance in application environments. This study focused on using micro-Raman spectroscopy, indentation cracking, and mechanical testing on as-received and annealed SiC/SiC CMCs to measure and investigate the residual stresses within the composite. Following the silicon Raman active mode at 520 cm-1 and the SiC Raman active mode at 796 cm-1, residual stresses within the matrix and reinforcing fibers were investigated with a spatial resolution of 1 micron. Indentation cracking allowed for an estimate of the residual stresses solely in the matrix material. Mechanical testing, paired with acoustic emission, enabled an understanding of the macro-mechanical behavior of the composite. Results from this study will aid in behavior and damage modeling of SiC/SiC CMCs.
Maher Amer, Ph.D. (Advisor)
Craig Przybyla, Ph.D. (Committee Member)
Henry Young, Ph.D. (Committee Member)
144 p.
Aerospace Materials; Materials Science
ceramic matrix composites; residual stress; silicon expansion; melt infiltration; Raman spectroscopy

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Citations

  • Kollins, K. N. (2017). Investigation of Residual Stresses in Melt Infiltrated SiC/SiC Ceramic Matrix Composites using Raman Spectroscopy [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1513591335033283

    APA Style (7th edition)

  • Kollins, Kaitlin. Investigation of Residual Stresses in Melt Infiltrated SiC/SiC Ceramic Matrix Composites using Raman Spectroscopy. 2017. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1513591335033283.

    MLA Style (8th edition)

  • Kollins, Kaitlin. "Investigation of Residual Stresses in Melt Infiltrated SiC/SiC Ceramic Matrix Composites using Raman Spectroscopy." Master's thesis, Wright State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1513591335033283

    Chicago Manual of Style (17th edition)

wright1513591335033283
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© 2017, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.