Does PreStressed Modal Analysis considers the FEA results of previous nonlinear analysis results?

DGK

Does PreStressed Modal Analysis considers the FEA results of previous nonlinear analysis results?

 

Below given are few cases:

Case 1:

Step 1 is Bolt preload
Step 2 is modal analysis STATSUB(PRETENS)=previous step

 

Case 2:

Step 1 is Interference Fit
Step 2 is Modal Analysis

 

Kindly guide me if there is any appropriate documentation available.

Adriano_Koga

For modal analysis you can use STATSUB(PRELOAD) option to carry stiffness change due to preload into your loadstep.

Take a look at OptiStruct help for Preload.