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pbc76049 (removethis) wrote:
> FASTEST RACE GLASS ON THE PLANET
> "Dick" <rwripper@prodigy.net> wrote in message
> news:Z2Owf.2267$801.194@newssvr30.news.prodigy.com...
> > Help an old mind come to the correct conclusion <G>.
> >
> > The situation is (2) steel straps side by side and fully in contact with a
> > bolt hole at each end . One is 4130 with about 80,000 psi tensile and the
> > other a heat treated 4130 to a 124,000 psi tensile strength.
> >
> > Is the combination strength 80,000 or 124,000 or
> > 204,000 psi tensile??
> >
> > Thanks, Dick
>
>
>
> GOD NO
>
> Tensile strength is stated in PSI per unit area, usually a square inch.
Huh?
Tensile strength, like pressure, is stated in units of force per
unit area, for example pounds per square inch (PSI). In this
context tensile 'strength' is a misnomer, it should be called
tensile stress, or more correctly, yield stress in tension or
rupture stress in tension.
If you want to know how much force it take to to yield (or rupture)
a part in pure tension, neglecting the effects of fatigue, stree risers
etc, you multiply the tensile strength by the smallest cross-sectional
of the piece that is bearing the full load. For a bolt that will be be
area at the thread root, but keep in mind that threads are a
significant
stress riser.
Thus if you have a rod with a cross sectional area of one square inch
and a yield strength of 100,000 psi then hanging a weight in excess
of 50 tons on that rod will yield it.
Maybe that is what you meant, but it was not particularly clear.
--
FF
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Re: Tensile Strength Question
