​​​​​​​Hi, All

I have a special application for bolt. Can someone help me ?

1st step, press the flange downwards with some level of force or load;

2nd step, release the vertical load , install some bolts and tighten with a small torque. You can see the details in the attached pictures.

We can find the single or multiple gasket parts in between the flanges, so we don't have any idea what the actual compression value under the specific pressure or load before we install the bolts.

So how can I build the model or contact at the 2nd step ? Thanks !

Abaqus ​​​​​​​