Output Bolt Pretension reaction force

Altair Forum User

I have a problem if I set bolt pretension force on three bolt and I want to output their force (at Bolt.fem)

 

I have open the control cards > GLOBAL_OUTPUT_REQUEST > PRETBOLT like the photo 

 

 

why it doen't have the pretension reaction force at the .h3dfile?

 

and I have 2 another question 

 

1. If today my model have a lot of face to need contact. Does Optistruct has the instruction to automatic define all the model's contact surfaces? If I just set a slave contact surface it will automatic to search which face will contact with this slave surface (Like LS-DYNA single surface contact)

 

Is like this?

 

if it's it I want to ask what si Vicinty tolerance and Reverse angle suggest value

 

 

2. At the rigid setting, if today I want to set the part to be rigid and set the revolute joint. I set at the model is wrong and I can't know its wrong (I can use RBE2 to do and now I am trying to use rigid part)

 

 *** ERROR # 2975 ***
 The RBODY with reference grid ID 3836 is constrained by more
 than six degree of freedom. This is not allowed.
 
 *** Run terminated because of error(s) in the input data.

 

 

 

 

 

 

 

Unable to find an attachment - read this blog

Altair Forum User

@Prakash Pagadala 

 

I have seen you met the problem too. But at before article, I don't know what you mean.

 

Thanks

Altair Forum User

HI,

 

Regarding PTFORCE, I will check and update you.

 

For contacts you can use AutoContatcts to automatically create contacts. 

 

With the rigid error, Looks like you are constraining nodes of rigid elements in all dofs which is not allowed. Please check and update the same. 

Altair Forum User

Hi @LKZ

 

According to OptiStruct help, Pretension force/adjustments are output in OptiStruct result format (.pret file) and right now it is not available in H3D format. 

Altair Forum User

@Prakash Pagadala Thanks to you

 

I can open the .pret file and it can open with text format.

 

Do you also set this?

 

 

But at the rigid error, I want the rigid part to have no degree of freedoms.

 

If you solve the problem, can you share me the file? I want to know where I make mistake.

 

Really thanks to your apply.

Altair Forum User

HI,

 

I will check with the rigid. 

 

Yes, the available format for PRETBOLT is OPTI

 

Altair Forum User

@Prakash Pagadala Thanks a lot.

 

I will wait for you.

Altair Forum User

Hi @LKZ

 

Right now I dont see a way with rigids, 

 

Can you try with MPCs?

Altair Forum User

@Prakash Pagadala I can do it with MPC.

 

Just like we use the RBE2, then set the joint with RBE2 set.

 

So I just want to try the method to use rigid part to set the joint on the center.

 

Thanks to your apply. If their is no method to use this method, I will continued to use the MPC method.

 

This time just I want to try, thanks.

 

Best Regards

Altair Forum User

Hi @LKZ

 

Makes sense. I will check with experts if there is a better to use RBODY in OptiStruct.

Altair Forum User

@Prakash Pagadala Thanks to your apply.

 

If it can use the RBODY then set the joint on the center.

 

Can you also share the file with me? Really thanks.

Altair Forum User

I am still not clear about the RBODY. I will update you once I have a similar model 

Altair Forum User

@Prakash Pagadala Really thanks to you!