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 KARL DEUTSCHINSTRUMENTS AND SYSTEMS FOR NON-DESTRUCTIVE TESTING OF MATERIALS.

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Technical Discussions
Shreya vaje
Student,
India, Joined Apr 2017, 7

Shreya vaje

Student,
India,
Joined Apr 2017
7
19:45 Mar-13-2019
Testing of hollow pipes with 70deg contour shoes

If 70deg contoured shoe is used to scan axial notch, then is it possible to get surface waves. If this is so, then how one can use 70deg contoured probes for such jobs. And I am also curious to know that how beam propagates in such probes.

Shreya Vaje
Student,
India, Joined Apr 2017, 7

Shreya Vaje

Student,
India,
Joined Apr 2017
7
06:12 Mar-26-2019
Re: Testing of hollow pipes with 70deg contour shoes
In Reply to Shreya vaje at 19:45 Mar-13-2019 (Opening).

I have waited for so long, but still no reply. I need to know that if mode conversion takes place in 70 deg contoured probes for axial or circumferential jobs.

Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 409

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
409
20:54 Mar-27-2019
Re: Testing of hollow pipes with 70deg contour shoes
In Reply to Shreya Vaje at 06:12 Mar-26-2019 .

Shreya,
sorry for the delay this is a forum of NDT and we try to stay away from matters too reorical and far from the common NDT experience.
I've never had a problem with such a problem. In case I would try something like that, hoping it could inspire you in some way.
Circular scan. From the triangle ABC: the emission point is in point A; the radial notch is in B; the chord AB of the triangle calculates the path in shear wave. The surface wave propagates instead along the AB arc.
With the probe in A, the screen could show only the notch signal generated by shear wave or even the presence of the surface signal. It depends on the diameter of the piece: when the curvature is excessive (dashed in the figure) the path AB and the distance between the center of the chord and the surface are rduced, therefore the shear wave and the surface wave can be in confusion; if the diameter increases it is instead all the contrary (see more external curvature in the figure, all observable graphically).
To start I would look for a configuration with a diameter suitable for separating the effects of the two waves both in the amplitude signal and the path. In this favored configuration the displacement of the probe from A to B, with sequence 1,2,3, generates a progressive loss of shear signal and increase of the eventual surface signal (if this signal is already on screen) or the birth of the surface signal in case the path AB is too wide to allow an initial presence of the surface signal together with the shear signal. If the diameter is excessive, finally the presence of surface waves could be negligible, both as an extension in space and in signal amplitude, and not very suitable for a study.
Finally a small ace in the sleeve: beating with a finger over the notch, the signal jerks both as shear and as surface waves; beating with a finger in an intermediate area between the notch and the point of emission we have a leap in amplitude only for effect on the surface wave, even to stop it.
As you can see, it is just a set of ideas; you have to work on it.
Considering that you are a student you could make this a subject of study at theoretical level. The propagation of surface waves on curved surfaces is a matter of particular study, with phase variations (depending on whether concave or convex) and velocity.
Greetings
mario

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