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Technical Discussions
Gary Georges
Gary Georges
07:49 Mar-21-2000
one-sided inspection of multi-layered composite sandwich structure

Is anyone aware of any NDE/NDI development in the area of
one-sided inspection of multi-layered composite sandwich
structure? Is any research being done? What instruments
or technologies are being used?

I'm interested in anything that is being done right now
in this area.

My phone number is 206-662-2161. Or, you can email me back.

Gary Georgeson, Ph.D
Sr. Specialist Engineer
Composites NDE Focal
Boeing, Seattle


    
 
 Reply 
 
Gary Georgeson
Gary Georgeson
08:08 Mar-21-2000
Re: one-sided inspection of multi-layered composite sandwich structure
: Is anyone aware of any NDE/NDI development in the area of
: one-sided inspection of multi-layered composite sandwich
: structure? Is any research being done? What instruments
: or technologies are being used?

: I'm interested in anything that is being done right now
: in this area.

: My phone number is 206-662-2161. Or, you can email me back
at gary.e.georgeson@boeing.com

: Gary Georgeson, Ph.D
: Sr. Specialist Engineer
: Composites NDE Focal
: Boeing, Seattle




    
 
 Reply 
 
andy cunningham
Consultant, NDT/QA QC/R&D
ASNT,PCN, Canada, Joined Feb 2000, 14

andy cunningham

Consultant, NDT/QA QC/R&D
ASNT,PCN,
Canada,
Joined Feb 2000
14
08:21 Mar-22-2000
Re: one-sided inspection of multi-layered composite sandwich structure
dear gary
we have been doing ut inspection on multi-layered materials using "A" scan. as the sound wave passes through each layer a percentage is reflected to the probe. depending on the "Z" factors of each interface governs the amplitude of each reflector before the back wall echo. echo pattern changes if layers are de-laminating.
also on composite bonding inspection. "A" scan multipul echo technique, also noting pattern change. this method does not reveal what layer is not bonded. i'm sorry i couldn't be more help time is too short.
andy cunningham

: Is anyone aware of any NDE/NDI development in the area of
: one-sided inspection of multi-layered composite sandwich
: structure? Is any research being done? What instruments
: or technologies are being used?

: I'm interested in anything that is being done right now
: in this area.

: My phone number is 206-662-2161. Or, you can email me back.

: Gary Georgeson, Ph.D
: Sr. Specialist Engineer
: Composites NDE Focal
:Boeing, Seattle




    
 
 Reply 
 
Michael Crump
Michael Crump
08:55 Mar-22-2000
Re: one-sided inspection of multi-layered composite sandwich structure
: Is anyone aware of any NDE/NDI development in the area of
: one-sided inspection of multi-layered composite sandwich
: structure? Is any research being done? What instruments
: or technologies are being used?

: I'm interested in anything that is being done right now
: in this area.

: My phone number is 206-662-2161. Or, you can email me back.

: Gary Georgeson, Ph.D
: Sr. Specialist Engineer
: Composites NDE Focal
: Boeing, Seattle


Thermal wave imaging seems to be promising. You might try Wayne University,
they have been doing research in this area (aircraft advanced composites)



    
 
 Reply 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 605

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
605
01:08 Mar-22-2000
Re: one-sided inspection of multi-layered composite sandwich structure
You may contact Dr. Xavier E. Gros.
He has acquired expertise in NDT of composite materials.
You may see his informative Homepage at http://w3.to/xgros.

Rolf Diederichs

-----------
: Is anyone aware of any NDE/NDI development in the area of
: one-sided inspection of multi-layered composite sandwich
: structure? Is any research being done? What instruments
: or technologies are being used?

: I'm interested in anything that is being done right now
: in this area.

: My phone number is 206-662-2161. Or, you can email me back.

: Gary Georgeson, Ph.D
: Sr. Specialist Engineer
: Composites NDE Focal
: Boeing, Seattle




    
 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
09:06 Mar-23-2000
Re: one-sided inspection of multi-layered composite sandwich structure
Dear Gary,


I have used some time of flight techniques on a vessel in South America. Not
necessarily research, but I was sizing cracks from the head of the vessel
that were 3 feet long and about 75 % through wall. Not a difficult task.


I have train some of the UT personnel at Boeing at your facility in Creeping
waves, Tip Diffraction, etc. I am on the road and I will let you know the
name of the person that I remember.


Sincerely,


J. Mark Davis
---------------
: Is anyone aware of any NDE/NDI development in the area of
: one-sided inspection of multi-layered composite sandwich
: structure? Is any research being done? What instruments
: or technologies are being used?

: I'm interested in anything that is being done right now
: in this area.

: My phone number is 206-662-2161. Or, you can email me back.

: Gary Georgeson, Ph.D
: Sr. Specialist Engineer
: Composites NDE Focal
: Boeing, Seattle




    
 
 Reply 
 
Galina Pavlenko
Galina Pavlenko
01:41 Mar-30-2000
Re: one-sided inspection of multi-layered composite sandwich structure
Dear Mr.Georgeson,

Votum JSC (Moldova) designs and manufactures a new portable bond tester "BT-C".

The BT-C is intended for one-sided inspection of various composites and honeycombs.
The BT-C is excellent in detecting of delaminations, disbonds, unbonds, porosities and internal structures violations.
It offers mechanical impedance & resonance testing and C-image reconstructing of structure violations.

Detailed information about BT-C you can find in Internet: www.votum.md

Please let me know if You require any further information.

Best regards,
Galina Pavlenko
Votum JSC
pgv@votum.md


    
 
 Reply 
 
Ian Munns
Ian Munns
02:01 Apr-03-2000
Re: one-sided inspection of multi-layered composite sandwich structure
ctly through discussion with our technical experts or through a
computerised literature search facility we have on-site, which is dedicated to joining.

If you would like to find out more about TWI and the services you have access to as a member company, then you can have a look at our general website at twi.co.uk (open to non-members as well as members). More specifically, as a member of TWI, you have
access to JoinIT (http://joinit.grantapark.com), a separate website, which provides technical information specifically for members.

Regards

Ian Munns


    
 
 Reply 
 
Wolfgang Bisle
Wolfgang Bisle
04:13 Apr-25-2000
Re: one-sided inspection of multi-layered composite sandwich structure
Lots of nice comments, but who has already got real experience with sandwich and composites for a long time in safety critical structures: ask the NDT-people from aircraft manufacturers.
I could recommend our training course for NDT-inspection of composites and sandwiches, which gives an excellent overview about available techniques.
But also I can say this:
Most loved sonic/ultrasonic instrument in our group is the Staveley Bondmaster, which combines several techniques in one instrument (Acoustic Flaw Detector, Pitch&Catch-Ultrasound (lamb waves), Acoustic Impedance Measurement like Zetec's Sondicator). It is really a multipurpose instrument.
Next ínstrument is the Woodpecker, a mechanized taptester with simple green/yellow/red-indication, simple but works.
You can also use standard US, but be carefull. You can sometimes get very strange effects. We tried with simple high damped probes to inspect parts of the Airbus rudder (CFK-Nomex-Honeycomb)to detect rear side disbonding - large disbonded areas showed the same inications like the wll bonded structure, small disbonds were indicated well as defects. After special spectroscopy we could solve this problems either with special narrow band filters or using special designed transducers - an expensive way, as this varies with different honeycomb types as well as with different skin thicknesses.
So one of the more promizing techniques is shearography, but please not the old fashioned way from LTI. There are better and more sophisticated systems available: Ettemeyer, Steinbichler, BIAS, ...
they have real fringe analysis, work with phase stepping and produce excellent images (refer to my presentation in Seattle 1994, Rev. of Prog. in QNDE, Vol 15).
Thermal wave imaging or modulation Thermography is also very promizing, the group around Prof. Thomas has developed a nice technology, but there are alternatives: The system from my colleagues of MTU in Munich (Mr. Günter Zenzinger, Daimler-Benz Aerospace, MTU München, Abt. TWPM, Dachauer Straße 665, 80995 München, Telefon: (089) 14895072)is our favorite.
We have also developed a mechanical stiffness checker, which runs under the brandname ELCH this is a simple instrument for checking disbonds of skins in honeycomb stuctures - even the disbond of the rear skin gives a drastic decrease in local stiffness of the structure, which can be detected easily.
There is also a very effective Bondtester, developed in Russia, and the company Rohmann (eddycurrent) once intended to become distributor (Bondchecker they named it I guess). But they went out of this business I think. Fred Schur - former Lufthansa and today after his retirement working as a consultant - is still promoting this equipment, which is very compact, easy to use and very accurate.
There is a lot in the market, but only few instruments have been already qualified (in therms of a qualification program, as we understand it in the aeronautics) so you will get a lot of promizes, but you have to do also a lot yourself, to become confident that you can do your job with that or that instrument.





    
 
 Reply 
 
Randy Plis
Sales, Consultant
AMDATA NDE Technology LLC, USA, Joined Oct 1999, 23

Randy Plis

Sales, Consultant
AMDATA NDE Technology LLC,
USA,
Joined Oct 1999
23
04:37 Apr-25-2000
Re: one-sided inspection of multi-layered composite sandwich structure
: Most loved sonic/ultrasonic instrument in our group is the Staveley Bondmaster, which combines several techniques in one instrument (Acoustic Flaw Detector, Pitch&Catch-Ultrasound (lamb waves), Acoustic Impedance Measurement like Zetec's Sondicator). It is really a multipurpose instrument.

As an additional consideration to Mr. Bisle's comment regarding the Bondmaster, you can go another step further and image (i.e., C-Scan data acquisition) the results of the Bondmaster. One such imaging system that is capable of doing it is the AMDATA IntraSpect (see ABB NDE Products exhibit on NDT.net) and works well with the automated scanning subsystem for aircraft, known as the Catamaran.



    
 
 Reply 
 
John Newman, Laser Technology Inc.
John Newman, Laser Technology Inc.
08:12 May-28-2002
Re: one-sided inspection of multi-layered composite sandwich structure
Mr. Bisle's comments regarding LTI Shearography Systems is uniformed. Laser Technology Inc. was the first to introduce acommercial electronic shearography system in 1987. These first generation instruments used subtraction shearography which provided an image of friges showing the first derivative of the out of plane deformation. While useful at that time for one sided sandwich panel inspection, this technology was completely made obsolete when we were the first to introduce phase stepping, high resolution cameras and automatic defect recognition to portable and production shearography NDT systems. The images these systems produce are extraordinary. Mr. Bisle is correct that shearography is a very powerful tool for One Sided Inspection of aircraft sandwich structures, but he is completely unaware of the LTI products and advances made by our company.

John Newman
Laser Technology Inc.
1055 W. germantown Pike
Norristown, PA 19403 USA

Laser Technology (UK) Ltd.
P.O. Box 183
Ketton
Stamford
PE9 3XA
UK


    
 
 Reply 
 

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