On Wed, 7 Jul 2010 06:46:03 -0700 (PDT), jamesgangnc
wrote:

On Jul 7, 8:50*am, Richard Casady wrote:
On Wed, 7 Jul 2010 04:40:31 -0700 (PDT), jamesgangnc

wrote:
I'm thinking that it's just sagged over the years till it has negative
camber. *That seems to be the most logical explanation since I have
the same wear problem on both sides. *A bent axle would not likely be
bent symetrically. *Nor does it seem reasonable that the toe would
change on both sides.

It is not going to break. The yield point is a substantial percentage
of the stress at which it would break. It it bends sitting, it would
break the first time you hit a bump.



Question is will my parking it with a floor jack under the center bent
it back over time.

No. See above.


Really? Cause it bows up about 3" in the center when I lift the
entire trailer and boat from the center of the axle with the floor
jack. You're saying that doesn't matter, that's not enough to bend it
any. Even if I do this for cummulative months?

Consider buildings, water towers, bridges. They are loaded initially,
and bend at that time. They then stay elastically bent forever,
without any permanent deformation. Things are not designed so weak
that they are loaded too near the breaking point and take up a
permanent set, creep is a word for it. Something like an axle will
break the first time you hit a bump if it has already been loaded to
the yield point just sitting there. To digress, brittle materials
cannot be permanently bent. That is what brittle means. Those Roman
stacked masonry arcades with the aquaducts on top that are still
standing after a couple of thousand years are a good example. They
have not shown any signs of slumping.

Casady