combining load cases

mpvnaresh

Hi

 

I am doing a nonlinear  direct transient analysis.

1. i have done a bolt preload analysis .

2. The Bolt preload case is called in to the nonlinear direct transient analysis.

 

In the bolt preload step suppose if bolt is compressed by 1 mm, it shou;ld be compressed by 1 mm at the beginning of  loadcase 2 , Yes it is happening.But gradually as the load case progresses, the bolt is comimng to its initial length , which means , the preload is getting nullified in the second load case .

 

My problem is , Once the bolt is pretensioned , it should remain pretensioned in the second load case also.

 

Please help me in this regard ...

 

 

This is very urgent and important ... 

Adriano A. Koga

are you using STATSUB(PRETENS) and CNTNLSUB in your second loadcase?

mpvnaresh

Hello 

 

Thanks for responding ..

 

I am not using CNNLSUBAs it will not work for different solution types.My first subcase is PRETENSION which is a nonlinear case, and the second is Non linear Direct Transient.

I am using  STATSUB(PRETENS) . But it is also not working as expected .

Adriano A. Koga

what if you create a NLDTRAN as pretension loadcase? I believe this would be possible.

mpvnaresh

Yes ..I used NLDTRAN ..But of no use 

cx g

mpvnaresh said:

Yes ..I used NLDTRAN ..But of no use 

Is this problem solved? I had the same problem.