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Yield function & plasticity

Posted 25 juin 2009, 10:03 UTC−4 2 Replies

Tim Pucker
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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?

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2 Replies Last Post 9 janv. 2010, 15:35 UTC−5
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Hello Tim Pucker

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Markus Brown
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Posted: 1 decade ago 9 janv. 2010, 15:35 UTC−5
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 9 janv. 2010, 15:35 UTC−5
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]

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