UT Module Validation

Generalities

The CIVA UT module allows to compute ultrasonic field propagation in a given component and to simulate defect response, for a wide range of transducers (single element or phased-array). Results are displayed in conventional imaging tools (Ascan, Bscan, Cscan…) associated to ray tracing and advanced reconstruction tools allowing to compare simulation with acquisition data.

In the framework of validation, experiments have been performed in order to evaluate the reliability and accuracy of CIVA predictions in the “UT Defect Response” module. CIVA results are often compared to experimental results but also sometimes they might be compared to results from other models. The reliability and accuracy are estimated by comparing amplitudes of the echoes. Those amplitudes are given relatively to the amplitude of a specular echo obtained on a calibration reflector (Side Drilled Hole (SDH), Flat Bottom Hole (FBH)…). You can find more information about the calibration method here.

The first part of the validation work deals with those reference reflectors in the aim of defining which ones can be used with confidence for various probes.

The second part concerns “classical” echoes in NDE: corner echoes from backwall or surface breaking notches in planar specimens.

The validation cases presented here deals with quite simple cases (canonical component, isotropic material…). A second validation campaign has begun at the CEA. These validations will deal with more complex inspections in terms of part geometry, type of inspections…

NB: in those validation pages, Transversal waves are called SV (Shear Vertical) waves, and Longitudinal waves are called P (Pressure) waves.

Achieved

The following experiments have been led for validation purposes.

Echoes obtained from calibration reflectors:

Corner echoes:

In progress

  • TOFD
  • Inspection with Phased Array probes
  • Inspection with Focused probes
  • Flaws in cylindrical specimen
  • Geometrical echoes

Complementary information

Results from different simulations can be compared according to some rules.

As Civa relies on semi-analytical models, many approximations exist and the limits must be known by the user.


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