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Technical Discussions
Vito Massarelli
Vito Massarelli
16:21 Mar-01-2012
Lateral Wave Deep in TOFD technique

I am working in my thesis, and i need to konw how deep the lateral wave goes into the material and what are the consecuences of that.
Could anybody recommends any book, paper or explain to me how to determine the depth?

Best regards

Vito Massarelli
Mechanical Engineering Student
Universidad Central de Venezuela

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
20:17 Mar-01-2012
Re: Lateral Wave Deep in TOFD technique
In Reply to Vito Massarelli at 16:21 Mar-01-2012 (Opening).

It depends on several factors and i believe the question is unclear. The lateral wave signal is due to sound travel on the and sub surface. The duration of the lateral wave signal depends on the frequency of the signal of the lateral wave and on the probes damping. Another factor which influence the duration of the lateral wave pulse is the pcs and the refracted angle used on the tofd pair. The higher the pcs and the lower the angle, the lower is the frequency of the lateral wave signal, then the longer is the duration.

 
 Reply 
 
Luis Ganhao
Engineering,
USA, Joined Sep 2008, 25

Luis Ganhao

Engineering,
USA,
Joined Sep 2008
25
21:57 Mar-01-2012
Re: Lateral Wave Deep in TOFD technique
In Reply to Vito Massarelli at 16:21 Mar-01-2012 (Opening).

Hi Vito,

Massimo is rigth what he explained, however some more items you have to consider is material, size of your probes and manufactuing of the probes.

If you need more help please contact me by Luis.Ganhao@cnrl.com

I started TOFD in 1991 in PDVSA-Intevep +14035136507

Cheers

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1286

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1286
22:11 Mar-01-2012
Re: Lateral Wave Deep in TOFD technique
In Reply to massimo carminati at 20:17 Mar-01-2012 .

Massimo is correct. Vito seems to be relating the depth of the "lateral wave" as one might consider the depth of penetration of eddy current. But the lateral wave is merely the name we give to the first arriving compression mode signal. It is not actually a separate wave form. In the photoelastic image on the NDT.net foum postings http://www.ndt.net/forum/thread.php?admin=&forenID=1&msgID=8556&rootID=8552
you can see the spherical wavefront of the compression mode at a glancing angle to the test surface. The pulse forming this "lateral wave" can be thought of as starting at the top surface and arcing down into the test piece

 
 Reply 
 

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