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Technical Discussions
Don
Don
06:58 Mar-04-2004
Calculation of velocity of surface waves

Does anybody know the equation for calculating the surface (Rayleigh) wave velocity, given the material properties, modulus of elasticity, poisson's ratio density etc?

I have seen rough calculation as 0.92*ShearVelocity, and a more accurate result using a calculator at www.eng.vt.edu/fluids/msc/jscalc/wscac02.htm but do not know the equations hidden inside it. Any ideas, Don



    
 
 Reply 
 
Paul A. Meyer
R & D,
GE Inspection Technologies, USA, Joined Nov 1998, 47

Paul A. Meyer

R & D,
GE Inspection Technologies,
USA,
Joined Nov 1998
47
02:55 Mar-04-2004
Re: Calculation of velocity of surface waves
In ULTRASONIC WAVES IN SOLID MEDIA, Joseph Rose references an approximate solution by Viktorov. The ratio of the surface wave speed to the shear wave speed (Cr/Ct)= (0.87 + 1.12*nu)/(1+nu) where nu is Poisson's ratio. For nu = 0.29 the ratio is 0.92 as you stated.
Paul


----------- Start Original Message -----------
: Does anybody know the equation for calculating the surface (Rayleigh) wave velocity, given the material properties, modulus of elasticity, poisson's ratio density etc?
: I have seen rough calculation as 0.92*ShearVelocity, and a more accurate result using a calculator at www.eng.vt.edu/fluids/msc/jscalc/wscac02.htm but do not know the equations hidden inside it. Any ideas, Don
:
------------ End Original Message ------------




    
 
 Reply 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 156

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
156
00:51 Mar-05-2004
Re: Calculation of velocity of surface waves
----------- Start Original Message -----------
: Does anybody know the equation for calculating the surface (Rayleigh) wave velocity, given the material properties, modulus of elasticity, poisson's ratio density etc?
: I have seen rough calculation as 0.92*ShearVelocity, and a more accurate result using a calculator at www.eng.vt.edu/fluids/msc/jscalc/wscac02.htm but do not know the equations hidden inside it. Any ideas, Don
:
------------ End Original Message ------------

Don,
There is a formula for the calculation of velocity of surface waves given on pg 22 of "The Krautkramer Booklet" (The blue book)It looks like it is the same formula as the one that Paul Meyer offered but it has not presented as a ratio. If you don't have a "blue" book contact your local Krautkramer Rep.

Regards
Neil Burleigh
P.S. The blue book now has a white cover.


    
 
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