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Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.
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Technical Discussions
KRISHNAN
KRISHNAN
07:52 Jul-14-2005
WAVE PATTERN

Dear Sirs,
Is it same of wave pattern (wavelenth and other characteristics) which produced in transducer element and RECEIVING signal after interfering with material' grain structures.

Because I feel that wave length will be distrubed when it crosses too many size of grain boundries.

Please kindly explain me about this topic.

Thank you very much

Regards,

Krishnan


 
 Reply 
 
Dr. Anish Kumar
R & D, Scientist
Indira Gandhi Centre for Atomic Research, India, Joined Mar 2000, 7

Dr. Anish Kumar

R & D, Scientist
Indira Gandhi Centre for Atomic Research,
India,
Joined Mar 2000
7
07:49 Jul-16-2005
Re: WAVE PATTERN
Hi Krishnan, You are right. The frequency characteristics of the ultrasoic wave (I assume you are talking about ultrasoic wave only) changes as it propagates through materials with different grain sizes due to different frequency dependent attenuation. You may see our following papers:

1.Anish Kumar, T. Jayakumar and Baldev Raj "Ultrasonic Spectral Analysis for Microstructural Characterization in Austenitic and Ferritic Steels", Philosophical Magazine A, Vol. 80 (2000) pp. 2469-2487.
2.Anish Kumar, T. Jayakumar, P. Palanichamy and Baldev Raj, "Influence of Grain Size on Ultrasonic Spectral Parameters in AISI Type 316 Stainless Steel
Scripta Materialia, Vol. 40 (1999) pp. 333-340.

Regards,
Anish

----------- Start Original Message -----------
: Dear Sirs,
: Is it same of wave pattern (wavelenth and other characteristics) which produced in transducer element and RECEIVING signal after interfering with material' grain structures.
: Because I feel that wave length will be distrubed whenit crosses too many size of grain boundries.
: Please kindly explain me about this topic.
: Thank you very much
: Regards,
: Krishnan
------------ End Original Message ------------




 
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