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Technical Discussions
Godfrey Hands
Engineering,
PRI Nadcap, United Kingdom, Joined Nov 1998, 286

Godfrey Hands

Engineering,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
286
17:24 Jun-09-2009
ET PoD in aerospace application

Hi,
Has anyone any information regarding what the PoD (Prtobability of Detection) is using Eddy Current Flaw detection technology in Aluminium Aerospace applications?

Customer requests detection of 1.4 mm long x 0.14mm deep surface breaking cracks.
I think the PoD will be very low on this, but with 2.5 x 0.25 PoD could reach reasonable numbers. Does anybody have any figures? Surface roughness is good, but access is limited.

regards,

Godfrey Hands

    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 822

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
822
15:30 Jun-10-2009
Re: ET PoD in aerospace application
In Reply to Godfrey Hands at 17:24 Jun-09-2009 (Opening).

Godfrey,

Normal calibration for ET with a 200kHz absolute probe is a 0.5 mm EDM Notch. So far as depth you would be OK. As for the length of the crack, the operator would haveto ensure a good overlap on the scan. I understand access is difficult, but I think it is feasable.

Good Luck,

    
 
 
Catalin Mandache
Catalin Mandache
15:23 Jun-15-2009
Re: ET PoD in aerospace application
In Reply to Godfrey Hands at 17:24 Jun-09-2009 (Opening).

Godfrey – I can refer you to the work our group completed on bolt-hole eddy current PoD. Here is a preliminary presentation of this work (that I may release): http://www.cnde.iastate.edu/MAPOD/2007%20November/GBHET_Nov_2007.pdf

I hope this helps you a bit, although not the same inspection situation.
Please let me know if you have any questions.

Catalin

    
 
 
David Forsyth
R & D
TRI/Austin, USA, Joined Nov 2001, 41

David Forsyth

R & D
TRI/Austin,
USA,
Joined Nov 2001
41
19:03 Jun-23-2009
Re: ET PoD in aerospace application
In Reply to Godfrey Hands at 17:24 Jun-09-2009 (Opening).

FAA ECIRE data is closest to your application, maybe? It studied manual pencil probe ET around rivet in Al skins for aircraft. I am out of the office so don't have it in front of me, but I seem to recall a 0.250" long crack = 6mm as about the number for reasonable detection. Will post the report number when I am back in office.

Regards, Dave.

    
 
 

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