Damage evaluation in dimension limestone using nonlinear ultrasonics

Limestone;dimension stone;thermal damage;damage;nonlinear ultrasonics;non-collinear wave mixing;safety

Love, Joshua E. ; Reis ; Henrique

关键词: Limestone;    dimension stone;    thermal damage;    damage;    nonlinear ultrasonics;    non-collinear wave mixing;    safety;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/104835/LOVE-THESIS-2019.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

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.