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.
15:30 Jun-10-2009 Re: ET PoD in aerospace applicationIn Reply to Godfrey Hands at 17:24 Jun-09-2009 (Opening).
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.
15:23 Jun-15-2009 Re: ET PoD in aerospace applicationIn 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.
19:03 Jun-23-2009 Re: ET PoD in aerospace applicationIn 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.
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