Recent Modelling Advances for Ultrasonic TOFD Inspections

Michel Darmon (1) , Adrien Ferrand (1) , Vincent Dorval (1) , Sylvain Chatillon (1) , Sebastien Lonne (2)

1 LSMA (CEA, LIST) - Laboratoire Simulation et Modélisation Acoustique (CEA, LIST)
2 EXTENDE

The ultrasonic TOFD (Time of Flight Diffraction) Technique is commonly used to detect and characterize disoriented cracks using their edge diffraction echoes. An overview of the models integrated in the CIVA software platform and devoted to TOFD simulation is presented. CIVA allows to predict diffraction echoes from complex 3D flaws using a PTD (Physical Theory of Diffraction) based model. Other dedicated developments have been added to simulate lateral waves in 3D on planar entry surfaces and in 2D on irregular surfaces by a ray approach. Calibration echoes from Side Drilled Holes (SDHs), specimen echoes and shadowing effects from flaws can also been modelled. Some examples of theoretical validation of the models are presented. In addition, experimental validations have been performed both on planar blocks containing calibration holes and various notches and also on a specimen with an irregular entry surface and allow to draw conclusions on the validity of all the developed models.

Domaines: Acoustique [physics.class-ph]; Modélisation et simulation

Michel Darmon, Adrien Ferrand, Vincent Dorval, Sylvain Chatillon, Sebastien Lonne. Recent Modelling Advances for Ultrasonic TOFD Inspections. 41st annual review of progress in quantitative nondestructive evaluation, vol 34, Jul 2014, Boise, United States. pp.1757-1765, ⟨10.1063/1.4914799⟩. ⟨cea-01852423⟩