 1543 views  Technical Discussions   Don
 Don
 06:58 Mar042004 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
 
   Paul A. Meyer R & D, GE Inspection Technologies, USA, Joined Nov 1998, ^{47}   02:55 Mar042004 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 
 
   Neil Burleigh Sales Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, ^{156}   00:51 Mar052004 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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