Issue << content << Use of CIVA Simulation Software for Development and Validation of Ultrasonic Testing Techniques


DOI:

2015. . No. 1(67) - Mar 2015, pp. 50-55

Use of CIVA Simulation Software for Development and Validation of Ultrasonic Testing Techniques

V. G. Badalyan, A. E. Bazulin, E. G. Bazulin, P. F. Samarin, D. S. Tikhonov

Main application areas of CIVA software as a mean for development and validation of UT techniques are considered. The software has been developed by the “Commissariat a l’Energie Atomique” (France) and validated by NPC “ECHO+” for use in nuclear power engineering in Russia. The results of acoustic waves’ behavioral analysis, for a tandem scheme of data logging in a simple object, obtained both experimentally and by simulation, are presented. It is shown that for objects of irregular shape the need in simulation is increased dramatically because of echo-signals harmful influence due to acoustic waves’ reflection and transformation on object’s free boundaries.
The testing technique with the use of acoustic antenna arrays has been simulated; simulation examples for testing technique parameters optimization are given. Minimal arrays quantity and their exact position on the tested object, necessary for detecting all the defects in the tested area, are defined. Functionality of the testing scheme has been estimated by test-specimen measuring results.
Estimation of possibility to detect and record all the defects of prescribed sizes within the tested area is demonstrated. The example of testing technique correction based on simulation results is given.
The curve of defect location probability dependence on their sizes (POD-curve) has been calculated using simulation of automated ultrasound testing technique for transversal defects detection in welded joint of 325 mm in diameter. Planar flaw models with inclination within от –3° ÷ +3° from vertical and azimuth angles within –3° ÷ +3° from the welded joint axis. Calculation results are compared with the ones after experiments.
 
Keywords: automated ultrasound testing (AUST), CIVA, simulation, parameter optimization, detectability, POD
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