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Re: Aluminum -- BE CAREFUL

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PLEASE BE CAREFUL!!!

30 ksi in shear seems an incredibly high "allowable" stress for 6061-T6 --
Especially since you may be dealing with 6061-T0 instead.

In 1965, Reynolds Metals published Fu varying from 38 ksi for extruded
shapes and tubes to 42 ksi for sheet and plate.

ASTM B210-80 gives Fy of 42 ksi for drawn seamless tubes.  ASTM B221-80
gives Fu = 38 ksi for extruded bar, shape and tube.

Essentially "zero" change between '65 & '80.

You asked for "allowable" shear.  When 6061-T6 is welded, the temper is
destroyed, and the alloy reverts back to 6061-T0.  Fu for "T0" varys from
16 to 17 ksi.

I was recently called in on some new 6061-T6 welded ductwork on an
industrial plant.  The base material cracked beside each weld.  The weld
alloy was somewhat stronger than 6061-T0 material.  

If you're anywhere close to a weld zone, you're likely to have some pretty
soft stuff.

Please be careful.

Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561

----------
> From: Greg Smith <strusup(--nospam--at)gte.net>
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Aluminum
> Date: Sunday, June 20, 1999 10:50 AM
> 
> 30,000 psi  Design of machine elements - 5th Ed. M.F. Spotts.
> 
> Greg
> -----Original Message-----
> From: Pat Symons <pat(--nospam--at)ensign-buckley.com>
> To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
> Date: Sunday, June 20, 1999 9:10 AM
> Subject: RE: Aluminum
> 
> 
> >Could someone please tell me the allowable shear for 6061-T6 Aluminum.  
> >
> >Thank you, Pat
> >Patrick V. Symons, Engineer
> >Ensign and Buckley, Consulting Engineers
> >3327 Longview Dr.
> >North Highlands
> >Sacramento, California 95660
> >Phone 916 971 3961
> >Fax 916 971 0578
> >