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
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.
> -----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