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Technical Discussions
Mokhtar
Mokhtar
08:27 Jun-20-2001
NDT for Composite

I would like to know the best laboratory NDT methods to inspect composite(PMC).

Thank you.


 
 Reply 
 
David
Student, Research Assistant
National University of Malaysia, Malaysia, Joined Jan 2000, 4

David

Student, Research Assistant
National University of Malaysia,
Malaysia,
Joined Jan 2000
4
09:13 Jun-20-2001
Re: NDT for Composite
: I would like to know the best laboratory NDT methods to inspect composite(PMC).
.
: Thank you.
.

Pulse echo ultrasonic method. Normal probe, direct contact.
Frequency range depends on your material thickness also.


 
 Reply 
 
mokhtar
mokhtar
02:36 Jun-21-2001
Re: NDT for Composite
: : I would like to know the best laboratory NDT methods to inspect composite(PMC).
: .
: : Thank you.
: .
.
: Pulse echo ultrasonic method. Normal probe, direct contact.
: Frequency range depends on your material thickness also.
.

Dear Mr David,
What about immersion technique? Let's say a have glass fibre and thickness is 5mm: What frequency should the probe be?

Thank you.


 
 Reply 
 
David
Student, Research Assistant
National University of Malaysia, Malaysia, Joined Jan 2000, 4

David

Student, Research Assistant
National University of Malaysia,
Malaysia,
Joined Jan 2000
4
09:47 Jun-21-2001
Re: NDT for Composite
Immersion technique has its own advantages but the
choice is yours. If the test material can be soaked
into liquid unconditionally, you can proceed with it.
Since your material is relatively thin and considering
that the material is a glass fibre reinforced composite,
the frequency range can be around 0.5MHz to 2MHz.
The selection is fairly at your discretion. Thank you.

All the best, David, N.V.


 
 Reply 
 
A. Mucciardi
Engineering, -
SLX, Inc., USA, Joined Jan 2000, 3

A. Mucciardi

Engineering, -
SLX, Inc.,
USA,
Joined Jan 2000
3
01:37 Jun-21-2001
Re: NDT for Composite
: Immersion technique has its own advantages but the
: choice is yours. If the test material can be soaked
: into liquid unconditionally, you can proceed with it.
: Since your material is relatively thin and considering
: that the material is a glass fibre reinforced composite,
: the frequency range can be around 0.5MHz to 2MHz.
: The selection is fairly at your discretion. Thank you.
.
: All the best, David, N.V.
.

SLX manufactures a tunable filter unit, the Noise Suppressor II, that adds on to any existing UT instrument. The dual tunable Filters (including a PreAmp) can significantly increase the S/N ratio for components possessing either small defects, or highly attenuative grain structure, or both. The NSII comes in four models, each operating in a different, and overlapping, frequency range. One of these models, NSII-L, operates in the 0.5 to 2.4 MHz range which appears to be the band of interest in this application. Details of this inexpensive, add-on instrument can be found at www.SLX-inc.com .

Regards, Tony





 
 Reply 
 
Jeff Leak
Jeff Leak
08:36 Jun-26-2001
Re: NDT for Composite
: I would like to know the best laboratory NDT methods to inspect composite(PMC).
.
: Thank you.


I have been inspection composite materials for about 11 years, at NASA's Marshall Space Flight Center. I typically use 5Mhz, 0.0250"dia probes, in a Type I immersion bath.

Generally, I inspect the composite panels in a thru-transmission mode, looking for the "bulk-attenuation" of the panel. We get a "plan-view" C-Scan image.

Jeff



 
 Reply 
 
Songping Liu
Songping Liu
03:16 Jul-29-2001
Re: NDT for Composite
We have developed a very high resolution RF ultrasonic evaluation technique specially for fiber reinforced composites. It is very useful and smart for applications in laboratory or field for composites.

Thanks

Songping Liu
Ph.D, director of the center for NDT&E
Beijing Aeronautical Manufacturing Technology Research Institute (BAMTRI)
Beijing 100024, P.R. China
E-mail: liusping@public.fhnet.cn.net
Tel: 86-10-65761731-2296(Office)
Fax: 86-10-65762306




 
 Reply 
 
ozan esen
ozan esen
02:08 Dec-18-2002
NDT for Composite
I'm the studen at civil aviation school in Turkey.. Could you please send me some text about "ndt for composites".. thank you..


 
 Reply 
 

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