Journal Published Online: 01 February 2023
Volume 51, Issue 5

Discontinuity Detection System in Marble: Analysis of the Time-Frequency Characteristics of Ultrasonic P-waves

CODEN: JTEVAB

Abstract

This study attempted to determine both the presence and the appearance of the surface of a crack artificially created in a marble block without axial loading or compression by FFT analysis of ultrasonic longitudinal sound waves by scanning the surface. In such respect, the study differs from other studies in the literature. The aim of the study was to minimize marble waste by determining the most appropriate slab cut direction based on the orientation of the fracture or discontinuity within the marble block. During location-controlled scanning of the marble surface, mean longitudinal wave velocity, Young modulus, Poisson ratio and longitudinal wave velocity variation data were obtained using a V-Meter Mark IV™ ultrasonic test device. For each location, longitudinal ultrasonic velocity data was taken at 250 kHz sampling rate and 256 data points were created. Data from the computer environment were subsequently reorganized using the MATLAB software and FFT conversions for such velocity data were obtained for each location. Then, the peaks of the FFT transformation components were determined by using the “Findpeaks” function in MATLAB‘s signal processing toolbox. The number of peaks in the 50-60 kHz range was determined for each location. A single difference was determined between the peak numbers at the locations within the cracked and uncracked regions. By examining the FFT graphs, it was determined that such additional peak occurring in the cracked regions appeared as a second frequency component near the dominant frequency values. Points with secondary frequency were recorded as 1, while all other points were recorded as 0 in a new matrix. Such data matrices created for each sample were examined by visualization in the form of surface graphics. Using these graphics, the orientations of discontinuities within the marble block may be determined according to the scanning surface.

Author Information

Bicakci, S.
Department of Electric and Electronics Engineering, Faculty of Engineering, Balikesir University, Balikesir, Turkey
Citak, H.
Department of Electric and Energy, Balikesir Vocational High School, Balikesir University, Balikesir, Turkey
Gunes, H.
Department of Computer Engineering, Faculty of Engineering, Balikesir University, Balikesir, Turkey
Coramik, M.
Department of Physics, Necatibey Faculty of Education, Balikesir University, Balikesir, Turkey
Aydın, Y.
Department of Electric and Energy, Akhisar Vocational High School, Celal Bayar University, Manisa, Turkey
Ege, Y.
Department of Physics, Necatibey Faculty of Education, Balikesir University, Balikesir, Turkey
Pages: 20
Price: $25.00
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Stock #: JTE20220415
ISSN: 0090-3973
DOI: 10.1520/JTE20220415