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08:44 Mar-13-2003

Hanurajie Baskan

Teacher, NDT Instructor
National Nuclear Energy Agency,
Japan,
Joined Oct 1999
1
UT for thin material

Dear Everybody,
I'd like to ask to ndt forum about my new specimen TiNi (as actuator). What kind NDT method should I use for this one?. The thickness is 130 micro after rolling. Is there probability by ultrasonic, what kind method of UT?. I was trying by UT immersion 35 MHz focus tranducer, but really unsatisfied. Is there anybody can suggest to me.
Thank you in advance.
Best regard

Baskan


 
09:17 Mar-13-2003
Kris Van de Rostyne
Re: UT for thin material Hello,
One possible solution to increase the bandwidth could be to use laser-ultrasonics. In this method, the ultrasonic waves are generated by the thermo-elastic expansion caused by the absorption of an incident laser pulse. The shorter the pulse-duration, the higher the bandwidth and resolution (but unfortunately, the higher the price I am afraid). For your application, a laser producing pulses of a few nanoseconds (e.g. Nd:YAG) should probably be convenient. Do you want to use UT for defect detection or for characterisation of properties?
Greetings,
Kris

: Dear Everybody,
: I'd like to ask to ndt forum about my new specimen TiNi (as actuator). What kind NDT method should I use for this one?. The thickness is 130 micro after rolling. Is there probability by ultrasonic, what kind method of UT?. I was trying by UT immersion 35 MHz focus tranducer, but really unsatisfied. Is there anybody can suggest to me.
: Thank you in advance.
: Best regard
.
: Baskan
.



 
01:56 Mar-13-2003

C. Valdecantos

Engineering
MTORRES, Ing.,
Spain,
Joined May 2001
9
Re: UT for thin material Depending on what are you looking for, some other ndt technique may be of use. For example, if the problem is to measure the thickness, Eddy Current may be the best, although this (Ti base?) alloy will probably show a very low conductivity. EC will also provide information (or even positive indication) on other parameters like cracks, inhomogeneities, laminar defects.

If EC is not suitable, perhaps thermografic analysis would be of use. In this case, the (supposed)low thermal conductivity of the material will help.


 


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