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High Resolution Ultrasonic Rayleigh Wave Interrogation of a Thermally Aged Polymeric Surface

Freed, Shaun L.
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1291685460

Abstract Details

2010, Doctor of Philosophy (Ph.D.), University of Dayton, Materials Engineering.
While polymer based materials oer many benecial properties, they are inherently susceptible to environmental degradation over time. This type of degradation, especially for thermal oxidative aging, occurs predominantly within a thin surface layer often less than 200 μm thick. A nondestructive technique for characterizing this layer has been developed that uses high resolution laser detection of displacements generated by a surface traveling ultrasonic Rayleigh wave. This research evaluates the potential of the technique to quantify the degree and depth of surface degradation caused by thermal aging. Rayleigh surface waves are useful because the measurement parameters depend directly on the mechanical properties of the degraded material, and the frequency of operation determines the ultrasonic depth of penetration. The measurements show sensitivity to polymeric thermal degradation, and feasibility is demonstrated for measuring surface layer depth with a frequency sweep. This research establishes the fundamental relationships between the developed ultrasonic procedures and its potential applications to thermal oxidative polymeric aging through finite element simulation, a representative aging experiment, and appropriate data analyses.
Robert A. Brockman (Committee Chair)
Shamachary Satish (Committee Member)
P. Terrence Murray (Committee Member)
Shaughnessy Gerald (Committee Member)
G. P. Tandon (Committee Member)
Eric Shell (Committee Member)
146 p.
Acoustics; Aerospace Materials; Materials Science; Polymers
Rayleigh surface wave; polymer durability; laser ultrasound; mediator wedge; finite element modeling; explicit solver

Recommended Citations

Citations

  • Freed, S. L. (2010). High Resolution Ultrasonic Rayleigh Wave Interrogation of a Thermally Aged Polymeric Surface [Doctoral dissertation, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1291685460

    APA Style (7th edition)

  • Freed, Shaun. High Resolution Ultrasonic Rayleigh Wave Interrogation of a Thermally Aged Polymeric Surface. 2010. University of Dayton, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1291685460.

    MLA Style (8th edition)

  • Freed, Shaun. "High Resolution Ultrasonic Rayleigh Wave Interrogation of a Thermally Aged Polymeric Surface." Doctoral dissertation, University of Dayton, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1291685460

    Chicago Manual of Style (17th edition)

dayton1291685460
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© 2010, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.