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 -

Sonatest Ltd
From our three distinct business centres in the UK, USA and CANADA, Sonatest design and produce a leading range of high performance ultrasonic NDT equipment and accessories.
786 views
Technical Discussions
ismail sarpun
ismail sarpun
00:48 Sep-11-2001
Rayleigh waves

I want to establish a system that can measure grain size by rayleigh waves.
Is there anybody that help me, how can I measure grain size by this way and
how can establish that experiment setup.
thanks for your helps.


    
 
 Reply 
 
Ernst Niederleithinger
R & D, -
BAM (Fed. inst. for material research and testing, Germany, Joined Jun 2001, 7

Ernst Niederleithinger

R & D, -
BAM (Fed. inst. for material research and testing,
Germany,
Joined Jun 2001
7
01:00 Sep-11-2001
Re: Rayleigh waves
: I want to establish a system that can measure grain size by rayleigh waves.
: Is there anybody that help me, how can I measure grain size by this way and
: how can establish that experiment setup.
: thanks for your helps.

Very interesting. Rayleigh waves are very popular in geophysical/geotechnical testing
(SASW method).
Grain size: R. Chammas (of French streets and bridges authority)
has done FE modelling on the influence of inclusions
on surface waves (rabih.chammas@lcps.fr).
Please keep me informed!





    
 
 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
01:24 Sep-12-2001
Re: Rayleigh waves
: I want to establish a system that can measure grain size by rayleigh waves.
: Is there anybody that help me, how can I measure grain size by this way and
: how can establish that experiment setup.
: thanks for your helps.
.

I have been working with Fallon Ultrasonics, Inc. on methods to deduce residual stresses from elastic wave velocity measurements. As part of this work, I have used Rayleigh wave ( relatively insensitive to stress) and critically refracted longitudinal wave (much more sensitive to stress) velocities (actually, travel times). These waves have been generated using focused ultrasonic beams like those generated by spherically and cylindrically focused ultrasonic transducers, by plastic wedges of an appropriate angle and by plane waves at an angle to the specimen surface in a water bath. Each of these methods has one or more advantages over the others. In all cases of practical alloys that we have studied, grain scattering is the material parameter that limits the highest frequency that can be used. We have not yet done much quantitative work with respect to determining grain size but it is very clear that the attenuation of these waves is strongly influenced by grain scattering at higher frequencies (as expected) and that this attenuation can be measured with relative ease. There are several corrections that must be made to the measured attenuation in order to obtain the grain scattering term which can be used to deduce the "mean" grain diameter in the region of material being sampled by the elastic wave. If you care to let me know the material and grain size range that is of interest to you, I can give you some general idea of the magnitude of effort that will be required.


    
 
 Reply 
 

Product Spotlight

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

AMIGO2

TSC Amigo2 - ACFM technology has developed a solid reputation for accurately detecting and sizing
...
surface-breaking cracks through paint and coatings. As the industry demands increased performance in speed, signal quality, and portability, it’s time for an evolution. It’s time for Amigo2.
>

Silverwing RMS PA - Phased-array corrosion mapping

Eddyfi Technologies integrated two market leading solutions, Silverwing’s RMS and M2M’s instru
...
ments to provide a high-speed, remote access ultrasonic phased-array inspection system with live total focusing method (TFM).
>

NEW - TD Focus-ScanRX

The NEW Next Generation Advanced UT platform, TD Focus ScanRX - Also available as a card stack solut
...
ion. Key Improvements 1. Data acquisition is significantly faster than current design 2. Better aesthetic – closely aligns with HandyScan RX 3. Improved IP rating (Target IP66) 4. Ruggedized housing 5. Connectors are protected from impact and ingress 6. Integrated stand and separate retractable handle easy to keep clean) 7. Touchscreen with ruggedized display glass 8. 3-Axis encoder input
>

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