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RE: seaint Digest for 22 Jul 1998

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>As the tension load is applied to the bolt through the
>connected parts, the bolt is not going to  get shorter (thereby relieving
>strain) but get stretched even more.
The bolt does stretch a little as external load is applied. But because 
the clamped parts are much stiffer than the bolt, the change in bolt 
strain (therefore stress) is small compared to the change in stress of 
the clamped parts. So the load doesn't change.
You need to consider both relative displacement *and* static equilibrium.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)