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Technical Discussions
gowrishankar
R & D, scientist
ISRO, India, Joined Nov 2008, 34

gowrishankar

R & D, scientist
ISRO,
India,
Joined Nov 2008
34
13:18 Jul-17-2009
debond test

sir,
i have a problem of testing debond between metallic(M250 STEEL of 5mm thick) casing with rubber(15-20mm thick)ID CLADDING.
Is this possiblr by UT METHOD?
ANY OTHER ALTERNATE NDT METHODS?

GOWRISHANKAR

 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
15:02 Jul-17-2009
Re: debond test
In Reply to gowrishankar at 13:18 Jul-17-2009 (Opening).

Yes, it is possible with an ultrasonic flaw detector. I read from your description that you have access to the steel, with the rubber in the inside surface. I would suggest a ringdown technique as described in this application note:

http://www.olympus-ims.com/en/ndt-application/183-id.209715211.html

For a 5 mm steel wall, I would suggest trying a 5 MHz delay line transducer. Delay line transducers usually work better than contact transducers in this test because you see more multiples of the steel backwall echo due to impedance relationships.

 
 Reply 
 

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