ANSYS simulation with different materials

[Loak]

Martin Liddle,

That sounds right but exactly what did you do?

- welded the joint node

What does that mean?

It means that I have joined the nodes with the function:

preprocessor ; coupling / Ceqn ; Coincident Nodes...

Loak

[Martin Liddle]

Post by Loak
Martin Liddle,

That sounds right but exactly what did you do?

- welded the joint node

What does that mean?

preprocessor ; coupling / Ceqn ; Coincident Nodes...

But there shouldn't be any coincident nodes if your glue operation had
worked (at least if I understand what you are trying to do).

[Loak]

Post by Martin Liddle

Post by Loak
Martin Liddle,

That sounds right but exactly what did you do?

- welded the joint node

What does that mean?

preprocessor ; coupling / Ceqn ; Coincident Nodes...

But there shouldn't be any coincident nodes if your glue operation had
worked (at least if I understand what you are trying to do).

That´s right, there isn't any coincident nodes but I´ve done that just
to be sure. But my problem is apparently the two different materials
because When I try with the same materials for each parts, it
functions. and when I try with two different materials, there is only
one part which moves.

Loic

[Dave Lindeman]

If the materials are of significantly different stiffness or density, then
some of the modes may only involve excitation of one cylinder. In your
original post you said that you "simulated with 50 steps". Does this mean
you extracted the first fifty modes? Do all fifty mode shapes only involve
one of the cyclinders? Are there any displacement boundary conditions
defined?

Regards,

Dave

--

=====================================================================

Dave Lindeman 3M Center 235-1F-36 Tel: [phone]
Senior CAE Specialist St. Paul, MN 55144 Fax: [phone]

=====================================================================

Post by Martin Liddle

Post by Loak
Martin Liddle,

That sounds right but exactly what did you do?

- welded the joint node

What does that mean?

preprocessor ; coupling / Ceqn ; Coincident Nodes...

But there shouldn't be any coincident nodes if your glue operation had
worked (at least if I understand what you are trying to do).

ThatŽs right, there isn't any coincident nodes but IŽve done that just
to be sure. But my problem is apparently the two different materials
because When I try with the same materials for each parts, it
functions. and when I try with two different materials, there is only
one part which moves.
Loic

[Loak]

Post by Dave Lindeman
If the materials are of significantly different stiffness or density, then
some of the modes may only involve excitation of one cylinder. In your
original post you said that you "simulated with 50 steps". Does this mean
you extracted the first fifty modes? Do all fifty mode shapes only involve
one of the cyclinders? Are there any displacement boundary conditions
defined?
Regards,
Dave

I extract the first fifty modes of the unit (the two parts together).
The two materials are : elastomer and steel.
One side of the elatomer cylinder is fixed while the other side is
jointed to the steel cylinder.
I would obtain the frequency of resonance of the unit (the two parts
together).

Loic