Dave;
Yes, the strength of aluminum alloys is quite different but their
"stiffness" (bending modulus) is very similar.
It is hard to say what the maximum spacing should be; it depends on the
load and on the panel shape. If it is a flat panel there should probably
be less spacing than on one with shape like a compound curve. Also, if
that panel is near the nose where there is high air velocity and high
aero loads, you definitely want it to stay down.
A small right- angle or "Z" shaped stiffener can help keep the panel
flat without resorting to an excessive number of fasteners.
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of Dave Dahlgren
Sent: Tuesday, December 28, 2004 4:41 AM
To: John Burk
Cc: Landspeed List
Subject: RE: Dzus Spacing
I think you need to read "machinery handbook" in the materials section
3003 and 5052 are not the same in strength 1100 is different from both
of
them. I have the 25'th edition but suspect the data has not changed.. in
my
copy look at pages 567 to 568. If you don't have a copy you need to buy
one.
Dave
> -----Original Message-----
> From: John Burk [mailto:joyseydevil@comcast.net]
> Sent: Saturday, December 25, 2004 10:46 PM
> To: Dave Dahlgren; land-speed@autox.team.net
> Subject: Re: Dzus Spacing
>
>
> Dave - If a panel bulged outward I would think the tension would keep
it
> from bulging far enough to reach the yield point - All aluminum alloys
are
> equaly stiff so the alloy doesn't matter .
|