Pretension stress phenomenon is uneven
Altair EmployeeI have two case of my pretension.
First is my simple test model, second is my realistic model.
I have the same contact in my two case but at my realistic model, it can't convergence.
In my realistic model the stress phenomenon should be average in my result. But it doesn't.
I want to ask why my phenomenon is different?
Is my contact error? or what instructions can I plus?
Simple test model :
Realistic model :
Answers
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Hi @LKZ
Are the conditions same in both conditions?
I see 7 layers in simple model and mid layers are completely constrained. But this is not the case in the realistic model
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I just want to show the realistic model situation should like the simple's situation.( Here at other software the situation is as same as the simple)
Because last time I want to told you the stress situation should be uniform.I have no example to told you. And at this time I have tried the model.
It can't convergence in the analysis
I have the same problem too and I have tried all solution about the file.
How should I plused to set ?
I have the file at here :
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Please change PARAM EXPRTNL to CNTSTB instead of AUTO and also it would be better if you share details of the model from the OTHER SOFTWARE.
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@Prakash Pagadala Thanks to your apply!
I have tried the AUTO. It just can amplified dt for 5 times.
And I can't find any where to adjust this amplified times.
Because like LS-DYNA the dt can amplified for 10 times so I am curious about can Opitstruct modify this value?
I will ask this because my dt is small like dt = 0.001 and if it convergence it only amplify for 5 tims (dt=0.005). I hope it can amplified bigger.
I don't set it at large dt because I afraid about if my model is convergence hard at some time.
The bigger dt will make it no convergence.
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Hi @LKZ
So you want to control the time step, correct?
Please confirm your requirements so that I can check with experts and if this is not available I can request for enhancement.
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Altair Forum User said:
I just want to show the realistic model situation should like the simple's situation.( Here at other software the situation is as same as the simple)
Because last time I want to told you the stress situation should be uniform.I have no example to told you. And at this time I have tried the model.
It can't convergence in the analysis
I have the same problem too and I have tried all solution about the file.
How should I plused to set ?
I have the file at here :
<?xml version="1.0" encoding="UTF-8"?>
@Prakash Pagadala At this problem.
Do you have any suggestions?
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Yes, please try with CNTSTB but this may not help with the DT
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Hi,
There is a request for enhancement for controlling timestep is already available and our developers are working on it.
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@Prakash Pagadala Do you have any answer?
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