On Sun, 26 Oct 2003 21:12:45 GMT, "Jim"
wrote something
.......and in reply I say!:

I have a shop making a digging tool which I resell. They use CRS 1".
My customers want to know what it would take to bend this bar if they pry
with it.
short of immobilizing one end of the bar in a horizontal position and adding
weights to the end of it, how can I describe it's "bendability"? *and*
where can I find that info?
I realize there are a lot of variables, like how long the bar is (48"), and
the range of temper and tensile strength it reached during it's manf.,

but
given all the above, what would it take to bend this bar?

And there you have the null question G

Most steels bend about the same for a given set of impingements. But
the difference is that some (spring steel for instance) will take a
lot of bending and ...well...spring back.

You need to know the Yield Strength of the steel used, as it is
actually sold.

It varies so enormously that you need to go back to the shop, find
what steel they use, and where they get it from. Then you need to go
to the suppliers, and get data on it as they supply to the shop. Then
make sure that the shop does not heat-treat the steel enough to affect
its properties.

_Then_ you can start to look at engineering programmes that tell you
how much it can be forced before it permanently bends.

There is also the matter of simple fracture failure. Many steels will
fracture before they reach their Yield Stength limit (or maybe it's
_as_ they reach it, but it's a simple explosive "bend" G)

Mind you, you could simply talk to the shop about it, and do a simple
empirical test.

And be prepared to be unpleasantly surprised :. I once had a quite
expensive "crowbar" 1.2m long or so and maybe 30mm hex. It bent very
easily. I probably shouold have complained, but was a callow youth at
the time.


Thanks for your input.
Jim


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