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Technical Discussions
AZIZ U. REHMAN
R & D
Quaid-e-Azam University, Islamabad, Pakistan, Joined Apr 2001, 11

AZIZ U. REHMAN

R & D
Quaid-e-Azam University, Islamabad,
Pakistan,
Joined Apr 2001
11
07:44 Jul-12-2001
Stable Solid Material in terms of Velocities over a range of temeprature


Does any one know about a Solid or a mixture of solid material that is stable in terms of Ultrasonic Velocities over a range of Temperatures from Room Temp. to about 70 Deg. C.

Thanking you in anticipation.


    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1266

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1266
00:16 Jul-12-2001
Re: Stable Solid Material in terms of Velocities over a range of temeprature
I suppose that by stable you mean that the velocity does not change (much).
Most materials will change, some more than others; however,
steel (and other metals) has a relatvely low dV/dT
on the order of less than a meter per sec per degree C
(typically 0.01%).
e.g. shear wave in steel has a dV/dT of about 0.3m/s/°C

:
: Does any one know about a Solid or a mixture of solid material that is stable in terms of Ultrasonic Velocities over a range of Temperatures from Room Temp. to about 70 Deg. C.
.
: Thanking you in anticipation.
.



    
 
 Reply 
 
Bruce Maxfield
Engineering, electronics and instrumentation
Analogic Engineering, Inc., USA, Joined Jan 2000, 10

Bruce Maxfield

Engineering, electronics and instrumentation
Analogic Engineering, Inc.,
USA,
Joined Jan 2000
10
02:05 Jul-12-2001
Re: Stable Solid Material in terms of Velocities over a range of temeprature
:
: Does any one know about a Solid or a mixture of solid material that is stable in terms of Ultrasonic Velocities over a range of Temperatures from Room Temp. to about 70 Deg. C.
.
: Thanking you in anticipation.
.
You might want to consider one of the common optical glasses like BK-7 or Zerodur as these are designed to have a very small thermal expansion coefficient near room temperature and this means a small l-wave velocity temperature coefficient.


    
 
 Reply 
 
AZIZ U. REHMAN
R & D
Quaid-e-Azam University, Islamabad, Pakistan, Joined Apr 2001, 11

AZIZ U. REHMAN

R & D
Quaid-e-Azam University, Islamabad,
Pakistan,
Joined Apr 2001
11
02:19 Jul-12-2001
Re: Stable Solid Material in terms of Velocities over a range of temeprature
Dear Sir ,

You are right, but need to have something with the velocities less than the shear velocity in Steel to have the shear mode generated inside steel, but staying stable inside the wedge (in terms of wedge velocity) even with the variation in temperature of the Wedge.

Can you have an idea.




    
 
 Reply 
 

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