Problem of contact between pretension

Altair Forum User

At first I have practiced the pretension and contact in optistruct.

And I used the non-linear quasi static analysis.

This time my problems are when I set the bolt for pretension at it middle face and I set contact between bolt and frame.

Why my bolt will fly away like the photo. ( I use the NLOUT for the iteration h3d file)

image.png.b45dc82c835cc185701e479afc9892d9.png

My contact setting is like this

image.png.15d7fb9289bf9bdf33aa178b7f4a8406.png

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Altair Forum User

Hi,

Can you try with SLIDE instead of PCONT?

Altair Forum User

@Prakash Pagadala

But I have coefficient of static and dynamic friction.

And I have read the help of your suggestion, it means

Sliding contact (applied to both open and closed contacts).

I don't really understand what it means.

Altair Forum User

Yes, sliding contact can be used for open and closed contact (NO gap)

Try with PARAM>>EXPLRTNL>>CNTSTB and check if this helps?

Altair Forum User

@Prakash Pagadala Thanks for your suggestion. It will not fly away.

Sorry about I late to reply to you because I am waiting for the NLOUT result.

I now have a question about my deformation situation. It looks strange.

Altair Forum User

I suspect, there is some issue with contacts.

Could you please share the file?

Altair Forum User

@Prakash Pagadala Thanks to your apply.

I am sorry I may not share the file at here but can you message me your email or contact method.

Because I can't message you.

Altair Forum User

Please use this secured link to upload your files https://ftam1.altair.com/filedrop/~Ce4god

Altair Forum User

@Prakash Pagadala Thanks for your help.

I have sent the mail for you.

Do you receive the mail?

Altair Forum User

Yes, I got the files.

BTW, the animation you posted is it from final h3d or from <filename>.nl.h3d?

Altair Forum User

@Prakash Pagadala

I posted it from <filename>.nl.h3d

and I just set 1group of contact.

Altair Forum User

Then, I would say wait for the final result. As said before, .nl will only help to monitor non-linear run, but what you see is not the final animation.

Altair Forum User

@Prakash Pagadala Thanks to your help.

But at the analysis process, We can see the deformation and the parts are fly away in NLOUT file.

Do you see any mistakes of my model?

Because I have used what I learned to set the model.

Altair Forum User

I don't see any broad mistakes in the model.

Did the analysis finish on your end?

Do you see reasonable results are still the problem persists?

Altair Forum User

@Prakash Pagadala Thanks to your apply.

The analysis doesn't have this problem. I have solved it.

And most bolts have pretension on the model.

I have updated my new problem just about the convergence problems.

I have posted it at other article.

Altair Forum User

OK, Glad to know about that.

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