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http://dx.doi.org/10.7776/ASK.2017.36.4.247

Estimation of the thickness of refractory ceramics using the impact-echo method  

Lee, Seongmin (Kyungpook National University)
Shin, Namho (POSCO Technical Research Laboratory)
Roh, Yongrae (Kyungpook National University)
Publication Information
The Journal of the Acoustical Society of Korea / v.36, no.4, 2017 , pp. 247-253 More about this Journal
Abstract
Generally, the vibration characteristics of refractory ceramics are identified by assuming them as isotropic materials. However, in practice, refractory ceramics exhibit anisotropic properties as they are manufactured by pressing ceramic powders along a particular direction. Therefore, in this research, the frequency responses of a refractory ceramic brick along its width, length, and height directions were acquired using finite element analysis by assuming that the ceramics had tetragonal symmetry in their material properties. The validity of the numerical analysis results was verified by comparing them with those from experimental measurements. Based on the frequency response, the thicknesses of the refractory brick along three different directions were estimated using the impact-echo technique. The maximum difference between the estimated and actual thicknesses was observed to be less than 5 %. This result confirms the effectiveness of the impact-echo technique along with anisotropic property characterization to evaluate the thickness of the refractory ceramic.
Keywords
Refractory; Impact-echo technique; Non-destructive testing; Finite element analysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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