Damage evaluation in dimension limestone using nonlinear ultrasonics
Love, Joshua E.
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https://hdl.handle.net/2142/104835
Description
Title
Damage evaluation in dimension limestone using nonlinear ultrasonics
Author(s)
Love, Joshua E.
Issue Date
2019-04-17
Director of Research (if dissertation) or Advisor (if thesis)
Reis, Henrique
Department of Study
Industrial&Enterprise Sys Eng
Discipline
Systems & Entrepreneurial Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Limestone
dimension stone
thermal damage
damage
nonlinear ultrasonics
non-collinear wave mixing
safety
Abstract
Dolomitic limestone test samples with increasing levels of damage were obtained by exposing limestone samples to temperature levels of 100 oC, 200 oC, 300 oC, 500 oC, 600 oC, and 700 oC for a period of 90 minutes. The samples were then nondestructively tested using nonlinear ultrasonics in the form of a non-collinear ultrasonic wave mixing approach. In addition, the test samples’ degradation of flexure strength due to damage accumulation caused by the exposure to increasing levels of temperature was also obtained using four-point bending tests. Results using the currently used non-collinear ultrasonic wave mixing approach correlate well (R2 = 92%) with the corresponding obtained reduction in strength, and with results obtained using different transducer arrangements. The approach has potential applications including quantitative evaluation of damage in stone artifacts and well as to evaluate fire-induced damage in stone infrastructure.
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