|
In article <dq7eto$tc4$0@pita.alt.net>, "Highflyer" <john@siu.edu>
wrote:
> "Alan Baker" <alangbaker@telus.net> wrote in message
> news:alangbaker-E02AA4.17114310012006@news.telus.net...
> > In article <gLYwf.5158$4o7.716@newssvr24.news.prodigy.net>,
> > "Dick" <rwripper@prodigy.net> wrote:
> >
> >> okay, got pounds per Square Inch and elongation differences and the
> >> failure
> >> sequence in my noodle.
> >>
> >> For simplicity, let's use 120,000 and 80,000 psi numbers.
> >>
> >> So if the 120,000 # piece is .667 square inches
> >> and the 80,000# piece is 1.0 square inch,,,are the elongations the
> >> same???
> >>
> >> Thanks, Dick
> >
> > Ummm...
> >
> > Think about it for a moment. To be different strengths, the two steels
> > must differ in chemical composition, right? Do you think that that
> > wouldn't also lead to different elongation under the same load?
> >
> > --
> > Alan Baker
>
> No it wouldn't lead to a different elongation under the same load. The
> alloy materials are such a small percentage of the metal that generally the
> bulk metal overrides and different alloys have, for all practical purposes,
> the same youngs modulus. In this case, both alloys were 4130 so there is not
> even a difference in the alloy. If they have the same cross section area
> and the same load they will have the same elongation. The heat treatment
> doesn't change the slope of the stress strain curve. It merely moves the
> yield point closer to the ultimate rupture point.
But then the piece without the heat treatment is going to yield at an
earlier point and thus elongate differently, is not it?
>
> Highflyer
> Highflight Aviation Services
> Pinckneyville Airport ( PJY )
>
> > Vancouver, British Columbia
> > "If you raise the ceiling 4 feet, move the fireplace from that wall
> > to that wall, you'll still only get the full stereophonic effect
> > if you sit in the bottom of that cupboard."
--
Alan Baker
Vancouver, British Columbia
"If you raise the ceiling 4 feet, move the fireplace from that wall
to that wall, you'll still only get the full stereophonic effect
if you sit in the bottom of that cupboard."
|
|
Re: Tensile Strength Question Continued
