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감육부에 대한 SH파 진단 정량화 및 가시화를 위한 연구
조윤호(Younho Cho),Yunri Piao,신봉재(Bongjea Sheen),현승호(Seungho Hyun) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
It is important to ensure the reliability of industrial facilities which are subjected to aging due to exposure to high temperature and high pressure environment. The eroded part in pipe line due to wall thinning needs to be assessed by applying special nondestructive inspection techniques which are widely used in order to evaluate the structural integrity. This can be achieved through the signal characteristic which also contains scattered information due to wall thinning. This paper will present the modeling for long-range scattering field of shear horizontal (SH) waves of eroded plates with Boundary Element Method (BEM) to predict the behavior of SH wave and to improve the reliability of the detection result. Moreover, with the comparison through transmission and reflection coefficient for different size of depth and width of the defect, we can evaluate the sensitivity of the SH wave mode. BEM formulation is performed in frequency domain, and then time domain's signal of BEM result will be compared with the experimental waveform in time domain. The finally, the quantification via imaging of wall thinning with reconstruction algorithm for the Probabilistic inspection of damage (RAPID) is accomplished. From this study, it is found that there is a good agreement of modeling result with experimental one.
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