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Technical Discussions
BÜLENT DOÐAN
BÜLENT DOÐAN
01:49 Sep-16-2002
sound attenuation

we cast a cylindrical shaped steel piece.inner redius is 20 ,outer redius is 60 cm. and height is 70 cm.when ý test the piece ultrasonically , ý realize a band in the middle zone of the test piece, where the sound attenuation occurs.why?


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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
03:04 Sep-16-2002
Re: sound attenuation
: we cast a cylindrical shaped steel piece.inner redius is 20 ,outer redius is 60 cm. and height is 70 cm.when ý test the piece ultrasonically , ý realize a band in the middle zone of the test piece, where the sound attenuation occurs.why?


One likely explanation would be a significant change in grain structure or a concentration of microporosity in that region. Strictly speaking, both of these conditions affect ultrasonic scattering rather than attenuation, but I imagine that what you are seeing is a loss of backwall signal, and that could definitely be due to coarser grain or microporosity. You should try testing the part at a lower frequency.

--Tom Nelligan
GE Panametrics



    
 
 

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