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work hardening?

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Fri Jun 13, 2008 4:36 pm Post subject: work hardening?

Hi!



I have a piece of 6061-t6 0.090". I bent it ~20degrees in a brake, at least 3t bend radius. The metal slipped in the brake while bending so I hammered it almost flat with a few whacks of the 4# hammer. I then rebent it ~1" away. Will the flatenning of the original bend case it to work harden enough to weaken it? This is on one of two pieces of 090 that sandwich a 3.5# piece of lead for the aileron counterweight. The other piece of 090 is fine.



Thanks!

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Dan

Ron Lendon

Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI

Posted: Fri Jun 13, 2008 5:10 pm Post subject: Re: work hardening?

I was going to comment but I'm not sure we are working on the same airplane.



do not archive

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Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Mon Jun 16, 2008 3:34 am Post subject: Re: work hardening?

If it's structural, I'd start over with a new piece. If it's a bracket for a cupholder you're probably fine. 



 	  messydeer wrote: 	
		  Hi!



I have a piece of 6061-t6 0.090". I bent it ~20degrees in a brake, at least 3t bend radius. The metal slipped in the brake while bending so I hammered it almost flat with a few whacks of the 4# hammer. I then rebent it ~1" away. Will the flatenning of the original bend case it to work harden enough to weaken it? This is on one of two pieces of 090 that sandwich a 3.5# piece of lead for the aileron counterweight. The other piece of 090 is fine.



Thanks!

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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davids601xl(at)yahoo.com
Guest

Posted: Mon Jun 16, 2008 7:56 am Post subject: work hardening?

Hi Dan. 

 Work (or strain) hardening actually hardens the metal (and is some cases there is an increase in strength)  but reduces its ductility. Ductility is REALLY important when it comes to cyclic loading  and Vibration.  From what I remember  fom my engineering metallurgy courses elastic strain is when the material is deformed and bounces back to its original shape and doesn't strain harden. Plastic strain (deformation) where it doesn't go back to its original shape cause the strain hardening.   In the end I don't feeel qualified to make a difinitive statement on the relative safety of your part.  It will be subjected to cyclic loads and vibration. Ask yourself this " What would happen with a complete failure of this part?  and is the part easily visible for inspections every walkaround"?  Then make your call.  Because I am a scratchbuilder and find most parts pretty easy to make over, I probably would just do another part.  No answer I know but that's jst my 2 cents. (1 drop of gasoline) 



David Barth

601 XL Plansbuilder  15% done?

Working on Wings

www.ch601.org



--- On Fri, 6/13/08, messydeer <messydeer(at)yahoo.com> wrote:

[quote]From: messydeer <messydeer(at)yahoo.com>

Subject: work hardening?

To: zenith-list(at)matronics.com

Date: Friday, June 13, 2008, 5:36 PM



[quote]--> Zenith-List message posted by: "messydeer"

<messydeer(at)yahoo.com>



Hi!



I have a piece of 6061-t6 0.090". I bent it ~20degrees in a brake, at

least 3t bend radius. The metal slipped in the brake while bending so I

hammered it almost flat with a few whacks of the 4# hammer. I then rebent it

~1" away. Will the flatenning of the original bend case it to work harden

enough to weaken it? This is on one of two pieces of 090 that sandwich a         [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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