crack growth data
crack growth data
(OP)
I'm looking for an on-line source of crack growth data (da/dn), particularuly 6061 aluminum. Does anyone have any links?
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RE: crack growth data
RE: crack growth data
RE: crack growth data
can i ask why you're using such a relatively non-structural Al in a primary structure ? ... part of the reason you can't find data is that because people generally don't use it, so not much investigation has been done.
i've had a quick browse through some of the data at my desk, and couldn't see anything on 6061.
RE: crack growth data
Thanks for your attention to my question. Any additional information would be greatly appreciated.
RE: crack growth data
Nigel Waterhouse B Eng (Hon's)
Can-Am Aerospace,LLC, Canadian Aircraft Certification Centre
www.canamaero.com
RE: crack growth data
i think it's reasonable conservative to use R=0 data for stress cycles with R>0. i would be more concerned about the impact of your manufacturing process, it sounds like you're doing a lot of plastic deformation which might upset the crack growth.
actually that leads to a couple of questions about the stress cycle ... if its plastically deformed in manufacture, how does this interact with the applied loading (a bit like a cold worked hole) ... but then that may be why you want high R data ('cause of the mean stress from manufacture);
and, if the liner isn't particularly structural how (or why) is it taking load (maybe in proportion to stiffness ?)
if i understand, you're applied 15ksi as a service load (linear elastic) ... over the top of your residual manufacturing stresses, or does the boss have no appreciatable stresses ? if the boss cracks does everything get really bad really fast ?
good luck
RE: crack growth data
http://www.nasgro.swri.org/
You might check out this site form metengr. They have some data.
h
RE: crack growth data
RE: crack growth data
Also try AFGROW, USAF reference data for fracture and fatigue analysis. Email me if you need this package.
Good luck.
Fran Ale