Maximum number of time increment cutbacks reached

Karthic_22061

Hi,

I am solving a NLSTAT,  LGDISP with follower load and surface to surface cont sliding contact.

Errors out 'Maximum number of time increment cutbacks reached'

tried using EXPERTNL, YES ; Increased value of NLPARM, NINC ; Increased value of NLADAPT, NCUTS but still facing the same issue.

 

Please do have a look at OUT file attached and suggest me how to resolve it

 

Thank you

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Altair Forum User

Hi Karthic,

 

Can you update to 2017.2.2 and check if the model converges in that version?

 

 

Karthic_22061

Hi Prakash,

I tried solving in 2017.2.2 but the same issue of non convergence due to Maximum number of time increment cutbacks reached persist.

Please suggest me what could be the issue.

 

Thank you

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Altair Forum User

Karthic,

 

Could you please share the model file using fiile transfer link available in my signature?

Karthic_22061

Sure,  i have shared it.

 

Thank you for the quick response.

 

Altair Forum User

Hi Karthic,

 

I think the problem is with the constraints. If you animate the model with your constraints, you can see large rotational displacement for the component guide.

 

Maybe you should re-think about constraints.  I am attaching the animation file for your reference. 

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Karthic_22061

Hi Prakash,

Please take a look at the animation file for older model. The guide is supposed to rotate about the hinge. 

my issue with the updated model is that contact is not taking place.

 

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Altair Forum User

Hi Karthic,

 

Please check the loading direction in the model you shared. From the video you shared I assume the load is opposite to what you have applied, correct?

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Karthic_22061

yes the load direction in video is correct. the guide is suppose to load the leaf spring

Altair Forum User

@Karthic

 

Yes, the load in the video seems reasonable but the load in the model shared pushes the guide in the opposite direction to that of the video.

 

Can you share the old file please to check what went wrong?

 

Did you scale the model by any chance?

Altair Forum User

I ran a static analysis and I see huge displacement. Can you check if the model is scaled or is anything missing compared to old model?

Karthic_22061

Good morning Prakash,

No i didn't scale  it, I have just rotated and repositioned the old file mesh to prepare the new model.

I have shared the old model for your reference.

 

Have a great day

 

Altair Forum User

@Karthic

 

I will check and update you soon. 

Altair Forum User

Hi @Karthic

 

I have shared a modified file with you. Please run the same and check the results. 

Karthic_22061

Hi Prakash,

I am trying to apply follower load using FORCE1  (FORCE1 entry can be defined as Follower Loads in Large Displacement Nonlinear Analysis)

In the file shared you have used FORCE. Can we use FORCE for follower loads?

 

 

Altair Forum User

Hi Karthic,

 

I have used the model as it is with some changes. I presumed the force as FORCE1. 

 

I will check once again and will come back to you 

Altair Forum User

Hi @Karthic

 

I shared a file with force1 and gravity load. Please check your inbox.

Karthic_22061

Hi Prakash,

Thanks you.  Please answer, Can i use FORCE for follower loads??

 

Altair Forum User

Hi @Karthic

 

According to help FORCE1 is preferred for follower loads when using large displacement analysis type. 

 

FORCE one worked in this case but need to investigate the results.