Specimens

Steam generator tube inspected with an axial probe
Probe

Geometrical characteristics of the axial probe
Defects
- A calibration defect: an external groove at 40 % of the tube thickness, 360 ° around the tube and 1 mm long.

Calibration defect: external groove at 40%
- An external and longitudinal notch of 6 mm length, 0.1 mm thickness, and a depth of 52 % of the tube wall.

Longitudinal notch of 6 mm length
- An external and longitudinal notch of 10 mm length, 0.1 mm thickness, and a depth 54 % of the tube.

Longitudinal notch of 10 mm length
- A transverse through wall notch, 82 degrees aperture and 0.1 mm length.

Transverse through wall notch
Comparisons between Experiment and Simulation
Then, the amplitude and phase values are gathered in a table and the difference between acquisitions and CIVA simulations are calculated. The low discrepancies values confirm the good agreement between CIVA and experiments.
But first of all, simulated and experimental Lissajous curves related to the calibration defect are superimposed her below.
External groove at 40% - calibration defect


CIVA/Experiment superimposition for the calibration defect which is the 40% external groove.
An external and longitudinal notch of 6 mm length


CIVA/Experiment superimposition for the longitudinal notch of 6 mm length. Left handside: Lissajous curve, right handside from the top to the bottom: real part, imaginary part, amplitude and phase.

CIVA/Experiment comparison of amplitude and phase values for the longitudinal notch of 6 mm length.
An external and longitudinal notch of 10 mm length


CIVA/Experiment superimposition for the longitudinal notch of 10 mm length. Left handside: Lissajous curve, right handside from the top to the bottom: real part, imaginary part, amplitude and phase.

CIVA/Experiment comparison of amplitude and phase values for the longitudinal notch of 10 mm length.
A transversal through wall notch, 82 degrees aperture


CIVA/Experiment superimposition for the transversal through wall notch. Left handside: Lissajous curve, right handside from the top to the bottom: real part, imaginary part, amplitude and phase.

CIVA/Experiment comparison of amplitude and phase values for the A transversal through wall notch.
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