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568 views
13:18 Jul-17-2009

gowrishankar

R & D, scientist
ISRO,
India,
Joined Nov 2008
34
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

 
15:02 Jul-17-2009

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
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.

 


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