<VV> Good Ref re strength of bolts

[Ron]

Trial and eror is shade tree development by uneducated tinkerers and bears 
absolutely no comparison to engineering of any kind.  Try being a test pilot 
for a new space shuttle being developed by trial and error!
----- Original Message ----- 
From: "Chris & Bill Strickland" <lechevrier at earthlink.net>
To: <virtualvairs at corvair.org>
Sent: Saturday, February 27, 2010 2:15 AM
Subject: Re: <VV> Good Ref re strength of bolts


> An interesting article by an apparently qualified engineer -- sometimes
> it is a shame that qualified engineers can not see beyond the
> mathematics of their profession -- yes, they have come a long ways since
> "Galloping Gertie", but they still refuse to accept empirical evidence
> that maybe their math on a particular fastener doesn't tell the whole
> story.  There is substantial empirical evidence, mostly from the world
> of aircraft it seems, that some higher strength fasteners do not perform
> as well under repeated cyclical flexing as fasteners of a lower grade.
>
> Maybe they aren't adequately torqued, or the fastened material is too
> soft to maintain that torque during the cycling, and the bolt only has
> it's high strength when under high tension.
>
> Anyway, if you discover that an application is breaking your highest
> strength fasteners, you might consider your own empirical testing with a
> fastener with a lower tensile strength.  If your Grade 8's are working,
> don't fix it!  But remember to periodically inspect critical fasteners
> for wear and corrosion
>
> Godspeed!
>
> Bill Strickland
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