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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?


 
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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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