where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
1575 views
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, 158

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
158
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.


    
 
 Reply 
 

Product Spotlight

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

FAAST-PA! OEM Patented phased Array for high speed UT inspection

Multiangle, Multifocus, Multifrequency, Multibeam. Instead of stacking UT electronics and having m
...
any PA probes, FAAST-PA is able to transmit all delay laws within ONE single shot in Real time.
>

Panther

M2M PANTHER is a phased-array equipment designed for both desktop and industrial applications, offer
...
ing unparalleled performance in a compact unit. It combines the speed required for industrial integrated Phased-Array Ultrasound (PAUT) solutions, with the most complete set of total focusing method (TFM) imaging techniques, making it the ultimate tool for R&D and procedure qualification.
>

Robotic laser shearography enables 100% inspection of complex, flight-critical composite structures

An article in “Composites World Magazine” showcases Non Destructive Testing of aero-structures
...
with Laser Shearography. Over the years Dantec Dynamics has supplied many solutions for the aerospace industry. Referring to specific customer projects several of these cases are examined to outline the advantages of using Laser Shearography for automated defect detection.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window