XANSYS Message: 38481 [Go back to message list]
[bookmark on del.icio.us]
No rating yet
Rate item:

Subject: Re: Structural (imbedded elements)
Author: Dean Brown
Date: 2002-06-04 15:30:00

David,

Have you checked the unconverged solution? This may provide a useful indication
of what is happening. What kind of nonlinearity? Material? Geometric? Contact?
What is the nature of the nonconvergence? DOF limit exceeded? Oscillation?
Other? Is it possible your structure is buckling?

I realize you've probably checked all these already, but these are some of the
things I check when I run into a convergence problem.

Best regards,
Dean Brown
Microvision, Inc.

-----Original Message-----
Sent: Tuesday, June 04, 2002 11:19 AM
To: xansys@yahoogroups.com

In order to save modeling time portions of a model were simplified by using
plate elements (63). To transfer the moments to the 63's, the plate
elements were partially imbedded in the solid elements (45). This is a
typical technique that has been around for quite a bit. The problem is that
it wont converge using a nonlinear static solution. Additionally, I built a
simplified model and still the model would not using a nonlinear static
solution. Using a linear static solution, it solves immediately.

For the elements in the transition range I reduced the material thickness
and stiffness by a factor of ten. The density was set to zero.

Any ideas? Has anyone else seen this?

Thanks
David

David L. Malametz, PE
Sr. Staff Engineer
Honeywell
Instrument Sensor Products Redmond
* david.malametz@h...
* (425) 885-8439
fax (425) 885-8579

"You don't know what you don't know!"

Posts possibly associated with message #38481AuthorDateScore
38468Structural (imbedded elements)David Malametz2002/06/04 
38481Re: Structural (imbedded elements)Dean Brown2002/06/04 
38482Re: Structural (imbedded elements)David Malametz2002/06/04 
38489Re: Structural (imbedded elements)James Kosloski2002/06/04