Position, length and orientation parameters of flaw related individually to the energy vanishing point, the number of peaks, the travelling time between peaks, the energy decay rate and so on.
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Experimental results proved that different geometrical parameters of welding flaws exhibited different traits on floating potential. All the simulation experiments were performed with a well-designed duplex finite element model, which can simulate ultrasonic guided wave testing (UGWT) of flaws embedded in the metro traction beam butt weld. In this study, to obtain welding flaw geometrical parameters more simply and conveniently, their correlations with floating potential were explored using groups of simulation experiments. Non-destructive testing (NDT), as an indispensable technique for assessing welding quality, is expected to continuously improve. Finally, we highlighted and compared the accuracy of these theories used for inversion procedure to quantify damage in the medium. The experimental results are then compared with some well-known effective media theories in order to discuss their potential use for following studies. The evolution of the ultrasonic velocities with respect to incident angle accounted for the damage-induced anisotropy. The acoustic measure-ments were conducted through a specific device using triple acoustic sensors, which allows to capturing at each incident direction three wave-modes.
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In contrast to other manual fabrication methods presented in the literature, the construction process considered here ensures a better control and accuracy of size, shape and spatial distribution of the microcracks network in the synthetic sample. A synthetic 3D printed sample including a system of horizontally aligned microcracks is used. Damage characterization in solid media is studied in this work through ultrasonic measurements.