Damage evaluation in dolomitic limestone using nonlinear ultrasonic higher harmonic generation

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.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Systems & Entrepreneurial Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2022

Author dc:creator

• Wang, Ruolei

Contributors dc:contributor

• Reis, Henrique M.

• Nondestructive Testing
• ultrasound
• limestone

Statement dc:rights

• Copyright 2022 Ruolei Wang

Language dc:language

en, eng

Handle dc:identifier

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

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F116240