Damage evaluation in dolomitic limestone using nonlinear ultrasonic higher harmonic generation

Wang, Ruolei

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https://hdl.handle.net/2142/116240 Copy

Description

Title

Damage evaluation in dolomitic limestone using nonlinear ultrasonic higher harmonic generation

Author(s)

Wang, Ruolei

Issue Date

2022-07-19

Director of Research (if dissertation) or Advisor (if thesis)

Reis, Henrique M.

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)

• Nondestructive Testing
• ultrasound
• limestone

Abstract

Dolomitic limestone specimens were increasingly damaged by heat treating them to 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C and 700 °C. Along with an undamaged specimen, all specimens were nondestructively tested using nonlinear higher harmonic generation method. The flexural strengths of the specimen were also obtained through four-point bending tests to validate the strength reduction caused by accumulation of microcracks through high temperature treatment. Results from higher harmonic generation method correlated relatively well with the corresponding strength reduction in each specimen (R^2= 0.91 for 3rd order amplitude ratio and R^2=0.84 for 5th order amplitude ratio), which matches with some of the finding conducted by previous studies. However, the results were also greatly influenced by the frequency of the sending waves. The application of this method should be introduced with other well-established methods such as noncollinear wave mixing to increase its reliability.

Graduation Semester

2022-08

Type of Resource

Thesis

Copyright and License Information

Copyright 2022 Ruolei Wang

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