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 -
1695 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, 159

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
159
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

CIVA 2020 UT Module

CIVA NDE Simulation Software is the world leader of NDT Simulation. The UT simulation Module incl
...
udes: - "Beam computation": Beam propagation simulation - "Inspection Simulation": Beam interaction with flaws or specimens The user can simulate a whole inspection process (pulse echo, tandem or TOFD) with a wide range of probes (conventional, Phased- arrays or EMAT), components, and flaws.
>

Echomac® PA Bar Tester

The Echomac® PA BT provides 100% inspection of round bars for core and surface defects, at speeds u
...
p to 2 m/sec, depending on the specific application. The unit allows producers to handle a much larger range of diameters in one installation, and is available in 3 models to test 10 – 75mm diameter (small model); 20 – 130mm (medium model) or 50 – 254mm (large model) bars.
>

Eddy Current inspection : RotoETscan Rotating Head

The rotating head RotoETscan detects the presence of longitudinal surface or sub surface defects a
...
t high speed. The rotating head is often installed directly on the production line. It is generally dedicated to the control of long products such as tubes, bars and wires, made of ferrous or non-ferrous material. It can also be used for inspection of small parts (billets).
>

IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

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