Non-destructive examination of ceramic matrix composites for quantitative determination of porosity via pulse-echo thermographic inspection

Moseley, Ross

Non-destructive examination of ceramic matrix composites for quantitative determination of porosity via pulse-echo thermographic inspection

dc.contributor.advisor	Siddique, Zahed
dc.contributor.author	Moseley, Ross
dc.contributor.committeeMember	Altan, Cengiz
dc.contributor.committeeMember	Lai, Feng
dc.date.accessioned	2021-12-14T14:28:32Z
dc.date.available	2021-12-14T14:28:32Z
dc.date.issued	2021-12
dc.date.manuscript	2021-11
dc.description.abstract	Ceramic Matrix Composites are seeing a widespread increase in use, especially in the aerospace industry. These materials are being utilized for their excellent material properties at high temperatures. As these materials are used in jet engine components and proposed as the skins of hypersonic vehicles, the consequences of material failure can be catastrophic. As-manufactured porosity is one of the earliest indicators of sub-optimal material properties that would lead to premature failure. Non-Destructive Testing methods have long been utilized for the examination of more “traditional” composite materials. This investigation discusses the use of several NDT methods on CMCs and the advantages and limitations of those inspection methods, with a particular focus on the determination of sample porosity. Pulse-Echo Flash Thermographic Inspection is of particular focus, while Film Radiography and Computed Tomography are also examined. Derived equations are examined for Film Radiography and Flash Thermography to determine their accuracy in calculating porosity from raw data. While Film Radiography did not yield a suitable equation, Flash Thermographic results yielded an equation which allowed for calculation of the sample porosity using only the raw data and known sample thickness. This equation was partially validated using results from additional sample sets. The additional limitations and artifacts of Flash Thermography are examined to show the ways in which the inspection method is limited. Examinations of representative aircraft components, manufactured of CMC material, also provided realistic defects and integrated components that were located by and had varying effects on the Flash Thermographic Inspection.	en_US
dc.identifier.uri	https://hdl.handle.net/11244/332312
dc.language	en_US	en_US
dc.subject	Ceramic Matrix Composites	en_US
dc.subject	Non-Destructive Testing	en_US
dc.subject	Porosity of CMCs	en_US
dc.thesis.degree	Master of Science	en_US
dc.title	Non-destructive examination of ceramic matrix composites for quantitative determination of porosity via pulse-echo thermographic inspection	en_US
ou.group	Gallogly College of Engineering::School of Aerospace and Mechanical Engineering	en_US