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Reliability of the ultrasonic inspection by numerical simulation technique

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The reliability of non-destructive testing techniques is assessed through probability of detection curves, better known by the acronym POD. POD curves were developed almost exclusively using experimental methods, but this is a slow and expensive procedure because it requires the preparation of a great number of test specimens with artificially inserted flaws. After the arrival of computational techniques, POD curves began to be numerically simulated by computers. The objective of this work is to evaluate the reliability of the ultrasonic non-destructive testing technique (NDT), for specific test conditions, using POD (probability of detection) curves developed by simulation procedures. This work is an extension of the paper presented by Carvalho et al, where the results of manual and automatic inspection by ultrasonic testing of a pipe weld are described. In the present work, the Monte Carlo technique of numerical simulation was used to develop POD curves for ultrasonic testing, considering the effect of the ultrasound beam divergence and the attenuation of the sound energy. Using this procedure, curves were plotted for different defect diameters and the results showed that it is possible to determine a theoretic POD for a specific defect diameter for the ultrasound technique. The results also proved that it is possible to assess the reliability of NDT techniques through numerical simulation using Monte Carlo simulation.


Document Type: Research Article


Publication date: November 1, 2011

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