Cosmos & Coat Hangers

Greets all. Am looking for a few pointers to get a CosmosWorks(2004)
static
analysis working. This is purely a learning exercise for me and any
tips would
be greatly appreciated -- hope I'm asking this in the right place.

I've modeled a (plastic) coat hanger -- looks like a number "2" in
profile.
I've added it to an assembly with a cylindrical "stub" to represent
the piece of
tubing that its hanging on. The inside "hook" of the hanger is mated
(tangent)
to the cylindrical face of the pipe. The assembly dynamics work
correctly in
that i can "pull" the hanger around the pipe and it maintains tangency
on the
inside without "falling off" (there is a coincident mate with a plane
of the pipe).

In short, two-piece assembly (coat hanger + pipe stub). Pipe stub is
fixed,
Hanger is completely mated and floating.

In CosmosWorks, the pipe stub is Fixed. There is a 1kg load on
the hanger -- top face of the "lower leg" -- where a pair of pants,
say, would
contact the surface once hung.

I'm having trouble mating the contact surfaces. (I think)

During simulation the hanger rotates around the pipe and the analysis
fails.

Setting a Fixed restraint on the small circular face that is the "tip"
of the hook
solves the problem but results in an unacceptable analysis. (Ie, real
hangers aren't
fixed there, and i see no stresses at the contact point.. only in the
throat of the
hook). I expect to see the hook to stretch and the bottom leg to
"droop"

Sorry so long-winded. My question boils down to: how would you set
analysis up?
Again, any pointers would be greatly appreciated.

-Tony

ps. LargeDeformation Contact is checked and am using FFEPlus solver

 

"post" <> a écrit dans le message de ...

Are you sure your 10 N force is vertical and not perpendicular to the bar or
the "2"?
This last case would make it rotate.

 

Meant the bar OF the "2"

 

Try fixing the long part and apply the force to the hook.

 

wow.. why is my post laid out so ugly? (sorry)

Jean Marc, yes, the force is vertical down (-Z). The load is fine..
its my restraints (or lack
thereof) -- that i'm unsure about.

The center of gravity of the coat hanger is slightly off to one side..
I would expect a slight rotation of
~5degrees of so -- but not this much (~30deg off vertical). Again, i
fear that its either
1. a misapplication of a Contact Surface, or,
2. a missing restraint.

 

no dice.. but I appreciate the help.
my hanger goes right through the bar... or the solver fails.
maybe i'll take a few steps back and try an easier example.

Thanks again,
-Tony