Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
[URGENT]Problem with boundaries-Solid Mechanics?
Posted 8 mai 2015, 19:03 UTC−4 Materials, Mesh, Studies & Solvers, Structural Mechanics Version 5.0, Version 5.1 1 Reply
Please login with a confirmed email address before reporting spam
I've been wracking my brains with this for the last few days. I keep getting a convergence error which most likely is due to an error on the boundary conditions? Attached is my file with what I have. I would be forever grateful if someone could take a quick look and tell me what I might be doing wrong with my boundary conditions.
Attachments:
1 Reply Last Post 10 mai 2015, 15:52 UTC−4
Please login with a confirmed email address before reporting spam
Posted:
10 years ago
Hi
for me the main issue is that you have selected Geometry "assembly" mode, this means that all your domains are independent.
To check such a model, I would have started by applying a body load => gravity and use a time dependent solver just to check that the body remains "up" as expected, you will be surprised by the result if you try this in assembly mode :)
Then you two "contact pairs" are of no use because you need continuity to hold the shoulders in place. or at least a pair BC constraint must be manually defined.
The best would be to start with 2-3 bodies and you test out the Geometry "assembly" and "union" mode to be sure you understand these: have the 3 bodies intersect (i.e. cubes somewhat overlapping each other). Then fix one boundary and apply a gravity body load and do a stationary study (turn on the plot while solving for each solver steps to monitor better what is happening ...)
--
Good luck
Ivar
for me the main issue is that you have selected Geometry "assembly" mode, this means that all your domains are independent.
To check such a model, I would have started by applying a body load => gravity and use a time dependent solver just to check that the body remains "up" as expected, you will be surprised by the result if you try this in assembly mode :)
Then you two "contact pairs" are of no use because you need continuity to hold the shoulders in place. or at least a pair BC constraint must be manually defined.
The best would be to start with 2-3 bodies and you test out the Geometry "assembly" and "union" mode to be sure you understand these: have the 3 bodies intersect (i.e. cubes somewhat overlapping each other). Then fix one boundary and apply a gravity body load and do a stationary study (turn on the plot while solving for each solver steps to monitor better what is happening ...)
--
Good luck
Ivar