Issue34

M. Scafidi et alii, Frattura ed Integrità Strutturale, 34 (2015) 622-629; DOI: 10.3221/IGF-ESIS.34.68 629 The analysis of the perturbation in the B-scan, due to the presence of the defects, allows determining the shape of the defect. The definition of the shape of the defect is achieved by means of the envelope of the ellipses drawn on the image section, by measuring the time of arrival of the wave reflected by the defect from the B-scan. Although the research requires a calibration procedure and the automation of some parts of the analysis, the results obtained are in good agreement with the characteristics of the defects created into the aluminum panel used as case study. The next steps of the research are the reduction of the effects of the shadow zones, the improvement and the automation of the procedures to extract position, size and shape of the defects. R EFERENCES [1] Cerniglia, D., Scafidi, M., Pantano, A., Rudlin, J., Inspection of additive-manufactured layered components, Ultrasonics, 62 (2015) 292-298. [2] Rudlin, J., Cerniglia, D., Scafidi, M., Inspection of laser powder deposited layers, Proceedings of 52nd Annual Conference of the British Institute of Non-Destructive Testing (2013), BINDT 2013 – Telford (UK), (2013). [3] Cerniglia, D., Djordjevic, B.B., Ultrasonic detection by photo-EMF sensor and by wideband air-coupled transducer, Research in Nondestructive Evaluation, 15 (2004) 111-117. [4] Scruby, C.B., Drain, L., Laser Ultrasonics: Techniques and Applications, Adam Hilger, Bristol, (1990). [5] Sinclair, A.N., Fortin, J., Shakibi, B., Honarvar, F., Jastrzebski, M., Moles, M.D.C., Enhancement of ultrasonic images for sizing of defects by time-of-flight diffraction, NDT&E International, 43 (2010) 258-264. [6] Petcher, P.A., Dixon, S., A modified Hough transform for removal of direct and reflected surface waves from B- scans, NDT&E International, 44 (2011) 139-144. [7] Petcher, P.A., Dixon, S., Parabola detection using matched filtering for ultrasound B-scans, Ultrasonics, 52 (2012) 138-144. [8] Merazi-Meksen, T., Boudraa, M., Boudraa, B., Mathematical morphology for TOFD image analysis and automatic crack detection, Ultrasonics, 54 (2014) 1642-1648. [9] Silk, M. G., The transfer of ultrasonic energy in the diffraction technique for crack sizing. Ultrasonics, 17 (1979) 113– 121. [10] Nath, S.K., Balasubramaniam, K., Krishnamurthy, C.V., Narayana, B.H., Reliability assessment of manual ultrasonic time of flight diffraction (TOFD) inspection for complex geometry components, NDT&E International 43 (2010) 152-162. [11] Nalbone, L., Adelfio, R., D’arienzo, M., Ingrassia, T., Nigrelli, V., Zabbara, F., Paladini, P., Campi, F., Pellegrini, A., Porcellini, G., Optimal positioning of the humeral component in the reverse shoulder prosthesis, Musculoskeletal surgery, 98(2) (2014) 135-142. [12] Nath, S. K., Effect of variation in signal amplitude and transit time on reliability analysis of ultrasonic time of flight diffraction characterization of vertical and inclined cracks, Ultrasonics 54 (2014) 938-952. [13] Ferrand, A., Darmon, M., Chatillon, S., Deschamps, M., Modeling of ray paths of head waves on irregular interfaces in TOFD inspection for NDE, Ultrasonics 54 (2014) 1851-1860. [14] Krautkramer, J., Krautkramer, H., Ultrasonic Testing of Materials, Springer-Verlag Berlin Heidelberg GmbH, New York, (1977).