Pretension stress phenomenon is uneven

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

@Prakash Pagadala 

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 : 

Unable to find an attachment - read this blog

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.

@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.

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. 

@Prakash Pagadala Yes 

I want to control the non-linear quasi-static's time step.

@Prakash Pagadala 

 

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?

Unable to find an attachment - read this blog

Yes, please try with CNTSTB but this may not help with the DT

Hi,

There is a request for enhancement for controlling timestep is already available and our developers are working on it. 

@Prakash Pagadala I have tried CNTSTB in my model

But it still have this problem.

Hi @LKZ

I will check and get back to you. 

@Prakash Pagadala Thanks to your reply.

I will wait for you.

@Prakash Pagadala Do you have any answer?