<VV> Fw: Good Ref re strength of bolts

[Ron]

Sorry, cat climbed on my lap and my response got sent before the obligatory 
signing.
RonH

----- Original Message ----- 
From: "Ron" <ronh at owt.com>
To: "Chris & Bill Strickland" <lechevrier at earthlink.net>; 
<virtualvairs at corvair.org>
Sent: Saturday, February 27, 2010 9:47 AM
Subject: Re: <VV> Good Ref re strength of bolts


> 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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