Inconel 718 - crack prop data

[nzhills1]

Hi,
I was wondering if anyone can point me in the right direction to get crack propagation data for Inconel 718, i.e. if a crack is detected and you can deduce the max. and min. operating stress, how many cycles would occur a each stress cycle?
Regards
Mark

 

[rb1957]

the first hit from a google for "718 crack growth" gives exactly what you need.

another day in paradise, or is paradise one day closer ?

 

[LiftDivergence]

nzhills1,

Look at this document:
WL-TR-94-4053 Volume 2
Damage Tolerant Design Handbook
Section 5.9

https://apps.dtic.mil/dtic/tr/fulltext/u2/a311689.pdf

There are a lot of da/dN vs. ΔK plots in there. If you know the geometry (beta) and have a stress you want to investigate, you can use this data to model crack growth.

Although beware that DOT/FAA/AR-05/15 "Fatigue Crack Growth Database for Damage Tolerance Analysis" states this is a "material identified in survey lacking adequate data for inclusion in the database"

Keep em' Flying
//Fight Corrosion!