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Technical Discussions
Denny Meyer
R & D
University of applied sciences Magdeburg-Stendal, Germany, Joined Jan 2009, 4

Denny Meyer

R & D
University of applied sciences Magdeburg-Stendal,
Germany,
Joined Jan 2009
4
13:29 Jan-26-2009
NDE on GFRP

Hello,

For a project I need some informations about the capability of NDE methods on GFRP like ultrasonic, radiography, thermography or accoustic methods.
- Which kind of defects can be detected with these methods?
- What are the detection limits of these methods at GFRP?
- Is there any method appropriated for the NDE on thick GFRP specimens like rotorblades?

    
 
 
Duygu
NDT Inspector, Quality Assurance Engineer
PFW Aerospace Industry, Turkey, Joined Sep 2008, 11

Duygu

NDT Inspector, Quality Assurance Engineer
PFW Aerospace Industry,
Turkey,
Joined Sep 2008
11
14:15 Jan-26-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

Hi I think the following adress will be helpful for you.


http://www.ndt-ed.org/index_flash.htm


Regards...

    
 
 
Richard Freemantle
NDT Inspector, Consultant, R&D
Wavelength NDT Limited, United Kingdom, Joined Nov 1998, 16

Richard Freemantle

NDT Inspector, Consultant, R&D
Wavelength NDT Limited,
United Kingdom,
Joined Nov 1998
16
15:00 Jan-26-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

Hi Denny,

This is a huge topic. If you use the "Search & Archive" facility on the NDT.net forum website and search under "wind turbine" you will find a number of papers that cover a range of NDT techniques and their capability for the inspection of GFRP rotor blades.

e.g.

http://www.ndt.net/article/ecndt2006/doc/Tu.1.5.3.pdf


Good luck with your project.

Regards,

Richard

    
 
 
Simon Amallraja
Simon Amallraja
16:44 Jan-26-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

Hello,

Ultrasonic Method:
Non Contact method - visit www.ultrandroup.com. You can have more details
Contact Method: log on to www.force.dk and www.sonatest.com. You will get plenty of application details from thier websites

Radiography Method: log on to www.vidisco.com for details.

Good Luck.

Simon

    
 
 
Athanasios Anastasopoulos
Director,
Mistras Group, Greece, Joined Jan 2000, 14

Athanasios Anastasopoulos

Director,
Mistras Group,
Greece,
Joined Jan 2000
14
10:27 Jan-27-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

This is a huge topic and in order to provide a concrete answer within a few lines we will need more info. For instance the type of defects in composites materials strongly depends on the manufacturing process (e.g. different defects are expected in hand lay up GFRP vs. high quality GFRPs manufactured in Autoclave). As in most of the cases in NDE a single method will not detect all different types of defects,

In the case of Thick Composites and rotor blades different methods might be used depending on the defects of interest. For instance:
- Acousto-Ultrasonic or Oblique angle Acousto Ultrasonic might be used to detect delaminations and planar flaws (for further info visit NDT Automation relevant web page at
http://www.ndtautomation.com/index.aspx?go=products&focus=/AU%20Systems/Pocket%20AU.htm ).
- Traditional ultrasonic might be used as well, although the penetration – max inspection depth might be limited. Olympus offer the so called High Power, High Penetration gauges such as the 25HP ( for further info visit http://www.olympus-ims.com/en/25hp-plus ) which with low frequency UT sensors might do the job.
- Acoustic Emission has been extensively used in testing of Rotor Blades. The method is applied either during controlled loading or during normal operation of the blades and proved to be sensitive as an early warning technique. For further info on NDT net note papers such as http://www.ndt.net/article/wcndt00/papers/idn553/idn553.htm and http://www.ndt.net/v07n09.htm , An extensive list of papers and summary of AEGIS R&D project can be found at http://www.eru.rl.ac.uk/AEGIS/aegis.htm
- As previously pointed out, thermography is also used during testing of Rotor blades and a comparative study between thermography and AE can be found in AEGIS web page.

Should you need additional info please feel free to contact me directly.
Best Regards.
Nassos

    
 
 
Robert Paynter
R & D,
U of Oxford, United Kingdom, Joined Jun 2001, 14

Robert Paynter

R & D,
U of Oxford,
United Kingdom,
Joined Jun 2001
14
15:34 Jan-27-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

I have worked on some research into methods for GFRP NDE, particularly thermal methods and for wind turbine blades. I suggest you look for reports and studies from who I then worked for
at Rutherford Appleton Lab, UK (http://www.eru.rl.ac.uk/projects_wind.html#I_Proj1)
Dr Dutton' s opinion on what works would be worth attention - ask him.

Robert

    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 829

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
829
17:52 Jan-27-2009
Re: NDE on GFRP
In Reply to Robert Paynter at 15:34 Jan-27-2009 .

Hi Guys,
Pardon my ignorance, but what does GFRP stnads for?

    
 
 
Simon Amallraja
Simon Amallraja
18:07 Jan-27-2009
Re: NDE on GFRP
In Reply to Michel Couture at 17:52 Jan-27-2009 .

Hello,

GFRP - Glass Fibre Reinforced Plastics
CFRP - Carbon Fibre Reinforced Plastics

Regards

Simon

    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 829

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
829
03:34 Jan-28-2009
Re: NDE on GFRP
In Reply to Simon Amallraja at 18:07 Jan-27-2009 .

Thanks a Bunch.

    
 
 
Sergio Damasceno
Sergio Damasceno
17:04 Feb-11-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

Please contact Mr. Jens Rusborg (jer@force.dk) at Force Technology - Aalborg. He has a lot of field experience in inspecting rotor blades.

    
 
 
Matt Crompton
Sales, Manager- NDT Sales
Dantec Dynamics Inc, USA, Joined Aug 2008, 3

Matt Crompton

Sales, Manager- NDT Sales
Dantec Dynamics Inc,
USA,
Joined Aug 2008
3
19:35 Feb-11-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

Hi Denny,
A newer technology that works very well on GFRP blades is 'Laser Shearography'.

I've had great success detecting wrinkles, dry spots, delams etc on blades in the air and on the ground. You should definitely consider this as an option.

Most of the work has been done in the last 9 months and so there are few publications however here is a link to one article.

http://www.dantecdynamics.com/Default.aspx?ID=2036

Good luck

    
 
 
Piotr
Piotr
07:19 Feb-12-2009
Re: NDE on GFRP
In Reply to Denny Meyer at 13:29 Jan-26-2009 (Opening).

Hello

Please look in this publications

www.agingaircraftconference.org/all_files/40/40a/40a-ppt.pdf
www.agingaircraftconference.org/all_files/40/40a/89_doc.pdf

this is somthing abiut GFRP main rotor blades inspection. I think this material willbe be very helpful

Regards

    
 
 

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