Menu

Discussion Forum

New Discussion
Filter

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.

Yield function & plasticity

Posted Jun 25, 2009, 10:03 a.m. EDT 2 Replies

Tim Pucker
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi,

im trying to use Comsol Strutural Mechanics Module to simulate some geotechnical problems. I created a rectangle with roller boundaries on the left, right and bottom boundary. The upper boundary is a load in the -y-direction. The expected stress state does not reach a plastic state.
Using perfectly plastic with von Mises yield function, or Drucker Prager yield function, the solver doesn't find convergence.
Moving the upper right point 0.0001m against the y-direction, the sovler finds convergence after a few seconds.

Where is the problem?

Attachments:

2 Replies Last Post Jan 9, 2010, 3:35 p.m. EST
COMSOL Moderator

Hello Tim Pucker

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Markus Brown
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Jan 9, 2010, 3:35 p.m. EST
You have parametric solver with a parameter "para". I did not see "para" in any of your equations.
Is your solution supposed to be in plastic region?



Hi,

im trying to use Comsol Strutural Mechanics Module to simulate some geotechnical problems. I created a rectangle with roller boundaries on the left, right and bottom boundary. The upper boundary is a load in the -y-direction. The expected stress state does not reach a plastic state.
Using perfectly plastic with von Mises yield function, or Drucker Prager yield function, the solver doesn't find convergence.
Moving the upper right point 0.0001m against the y-direction, the sovler finds convergence after a few seconds.

Where is the problem?


You have parametric solver with a parameter "para". I did not see "para" in any of your equations. Is your solution supposed to be in plastic region? [QUOTE] Hi, im trying to use Comsol Strutural Mechanics Module to simulate some geotechnical problems. I created a rectangle with roller boundaries on the left, right and bottom boundary. The upper boundary is a load in the -y-direction. The expected stress state does not reach a plastic state. Using perfectly plastic with von Mises yield function, or Drucker Prager yield function, the solver doesn't find convergence. Moving the upper right point 0.0001m against the y-direction, the sovler finds convergence after a few seconds. Where is the problem? [/QUOTE]
Markus Brown
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Jan 9, 2010, 3:35 p.m. EST
You have parametric solver with a parameter "para". I did not see "para" in any of your equations.
Is your solution supposed to be in plastic region?



Hi,

im trying to use Comsol Strutural Mechanics Module to simulate some geotechnical problems. I created a rectangle with roller boundaries on the left, right and bottom boundary. The upper boundary is a load in the -y-direction. The expected stress state does not reach a plastic state.
Using perfectly plastic with von Mises yield function, or Drucker Prager yield function, the solver doesn't find convergence.
Moving the upper right point 0.0001m against the y-direction, the sovler finds convergence after a few seconds.

Where is the problem?


You have parametric solver with a parameter "para". I did not see "para" in any of your equations. Is your solution supposed to be in plastic region? [QUOTE] Hi, im trying to use Comsol Strutural Mechanics Module to simulate some geotechnical problems. I created a rectangle with roller boundaries on the left, right and bottom boundary. The upper boundary is a load in the -y-direction. The expected stress state does not reach a plastic state. Using perfectly plastic with von Mises yield function, or Drucker Prager yield function, the solver doesn't find convergence. Moving the upper right point 0.0001m against the y-direction, the sovler finds convergence after a few seconds. Where is the problem? [/QUOTE]

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content