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     lee (leemu215) Member Username: leemu215 Post Number: 15 Registered: 06-2008 |
I am trying to use flexpde to solve an elastic-plastic problem,but there are some errors ,can you help me to fix it up?or is there a better way to define the elastic-plastic relation? Thanks! and it is possiple to plot some specified variable in two D graphic? for example i want x-axis stand for temperature and y axis stand for energy or sth else.
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| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1156 Registered: 06-2003 |
I don't think your equations represent an adequate model of plasticity. You should consult a text book on the subject. It is not at present possible to construct arbitrary 2D plots. Use one of the available data export formats and use a visualization product to create your plots. | |||
| lee (leemu215) Member Username: leemu215 Post Number: 16 Registered: 06-2008 |
here is an example that i did ,can you tell me ,why it can not work? I want to move the arc boundary ,and it also rotate itself ,like some kind of rolling problem. Thank you very much!!!
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| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1159 Registered: 06-2003 |
We are not qualified to judge the correctness of your mathematical model. However, it appears that the model develops a tear at the top corner of the arc, after which the equations or their numerical approximation become invalid and the simulation crashes. You should check the validity of your boundary conditions. Remember also that with a fixed-mesh model the geometry of the derivative approximations does not change from the original configuration, and at some point become invalid. Perhaps you should try a moving-mesh model. But first be sure the boundary conditions do not conflict with one another. W have added some plots to your script in the attached file. 
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elastic-plastic