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 -

Airstar Inc.
Application of the newest technologies, such as air-coupled ultrasound, digital instrumentation, signal processing, and transducer technology.

1718 views
Technical Discussions
Manuel
Manuel
06:46 Sep-12-2005
impact echo : limited to concrete ?

All I read about Impact-Echo deals with concrete structures, but I'd like to know if it can be used for other materials (such as wood, metal...)
Any information about that?
Thanks in advance...


    
 
 
Bill Weber
Director
IMPACT-ECHO INSTRUMENTS,LLC, USA, Joined Mar 2003, 2

Bill Weber

Director
IMPACT-ECHO INSTRUMENTS,LLC,
USA,
Joined Mar 2003
2
09:04 Sep-12-2005
Re: impact echo : limited to concrete ?
----------- Start Original Message -----------
: All I read about Impact-Echo deals with concrete structures, but I'd like to know if it can be used for other materials (such as wood, metal...)
: Any information about that?
: Thanks in advance...
------------ End Original Message ------------

Hi There, Yes, Impact-Echo can be used for other materials such as wood and graphite, but not steel, because the wave speed is way too high in steel. Have you visited our website, www.impact-echo.com? We have a new 9 page downloadable brochure.

Bill Weber 607 738 1547



    
 
 
rma
Student
Indonesia, Joined Dec 2010, 2

rma

Student
Indonesia,
Joined Dec 2010
2
11:09 Mar-27-2011
Re: impact echo : limited to concrete ?
In Reply to Bill Weber at 09:04 Sep-12-2005 .

I'm interest with impact echo. Is impact echo able to used detect the composite of material?for example. If we have damaged concrete. the best material on one side and the poor material on the aother side, but we don't know the material in the middle part. Is impact echo able to detect the the wave speed or properties material of the damaged side?and the middle side?thank you

    
 
 
dipl. Ing. Stanislav Starman, Ph.D.
R & D, producer of non-destructive testing equipments
Starmans electronics s.r.o., Czech Republic, Joined Apr 2002, 4

dipl. Ing. Stanislav Starman, Ph.D.

R & D, producer of non-destructive testing equipments
Starmans electronics s.r.o.,
Czech Republic,
Joined Apr 2002
4
14:13 Mar-27-2011
Re: impact echo : limited to concrete ?
In Reply to rma at 11:09 Mar-27-2011 .

For wood composite we have DIO2000- Air couplant 50 kHz -400 kHz
200 mm thickness (CSCAN)
Contact transducerDIO2000 LF with burst pulser for True transmition up to 2 m lenght wood, 8 m concrete (manual measurement)
DIO1000LF for measurement of Velocity, Elasticity



www.starmans.net

    
 
 
Martin Schickert
R & D,
Institute for Materials Research and Testing, Germany, Joined Jan 2000, 18

Martin Schickert

R & D,
Institute for Materials Research and Testing,
Germany,
Joined Jan 2000
18
09:01 Mar-30-2011
Re: impact echo : limited to concrete ?
In Reply to rma at 11:09 Mar-27-2011 .

The impact-echo method is able to detect boundaries between homogenous materials with different acoustic impedance (wave velocity, density) - as is the case for any method using elastic waves. If you have a clear boundary between one and the other material you will get a reflection as a positive indication.
Unfortunately, poor concrete with decreased compressive strength, enhanced porosity, and/or small cracks will not reflect. In this case you can use the damped and/or delayed back-wall reflection as a negative indication. (More advanced methods would investigate the spectral properties of backscattered waves.)
Differences in propagation speeds can also be detected indirectly by the placement of the back-wall indication. Results are integral through the complete material. For a spatially-resolved propagation speed, a tomographic method is necessary.

    
 
 
rma
Student
Indonesia, Joined Dec 2010, 2

rma

Student
Indonesia,
Joined Dec 2010
2
10:47 Mar-30-2011
Re: impact echo : limited to concrete ?
In Reply to Martin Schickert at 09:01 Mar-30-2011 .

It means that if i use damper or black wall, impact echo can detect the inner condition of concrete including modulus of elasticity, strength, poisson ratio and density. Is that right?

If we have damaged concrete because of high temperature, concrete will change the properties material or conditiuon of concrete from surface until inner concrete until botoom concrete gradually. But we don't know how much layer will be happend. So, what is the function of damper or black wall?do we take the impactor on 2 sides?

thank you very much

    
 
 
Martin Schickert
R & D,
Institute for Materials Research and Testing, Germany, Joined Jan 2000, 18

Martin Schickert

R & D,
Institute for Materials Research and Testing,
Germany,
Joined Jan 2000
18
09:23 Mar-31-2011
Re: impact echo : limited to concrete ?
In Reply to rma at 10:47 Mar-30-2011 .

I don't understand what you mean by "damper or black wall".
If you measure a single parameter - resonance frequency in case of impact-echo - you can only draw conclusions on a single property of your test object. And even this holds only if all other influencing parameters remain constant.
In your case of partially damaged concrete, you might get a qualitative survey of damaged areas if you perform single-sided impact-echo measurements on a grid covering the complete test range.

    
 
 

Product Spotlight

Aerospace Systems - Automated Ultrasonic Inspection

USL are specialists in the design and manufacture of turnkey ultrasonic inspection systems for aer
...
ospace applications. From monolithic composites to complex honeycomb structures. This video shows just a few examples of what is possible, find out more at: www.ultrasonic-sciences.co.uk
>

Semi-Automated Phased Array Immersion System for Small Composite Parts

Turn-key semi-automated system as an improved and affordable solution for inspection of small comp
...
osite parts. Includes support table, immersion tank, scanner, PA instrument, PC, Analysis software, database, wedge management and other options.
>

Navic - Steerable Modular Automated Scanner

The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used
...
in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

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