How to apply preloads to a bolt model in Simcenter with Nastran solution 402

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Questions about preloads are common. If you've ever wondered how to model a bolted connection or how to model the bolt torque in an analysis, this video has the answers.
You'll see how to apply bolt preloads to a model in Simcenter with Nastran solution 402 as we demonstrate the nonlinear material capabilities of SOL 402.
You'll see how to easily:
• Idealize the bolt for meshing (Split body)
• Mesh the bolt
• Create a Preload subcase in SOL 402
• Create a Preload load
Starting in the idealized part, we cut the bolt in half to create a plan to apply preload. Next, in the FEM, we added mesh mating conditions to each bolt to ensure a continuous mesh. In the SIM, we used preload subcases to establish preload before the internal pressure was applied.
This is how you define a preload on 3D elements using the cut-plane method in Simcenter NX.
Check out our related video on how to simulate a flat gasket in Simcenter with Nastran solution 402.

[@ahmetunal8881]

Can you show how to use re-start capability in Sol402 next time? Pre-loading first, and then continue solving for different pressure values using re-start from pre-load subcase, so do not have to go through solving for contacts again would be very useful.

[@benjemmery]

Hi Ahmet, I agree that restart are quite useful for simulations with preloads! I take a note on your comment and I might produces a video on restart soon (through Maya's channel). In the meanwhile, Siemens documentation can help to set it up: docs.plm.automation.siemens.com/tdoc/nx/1899/nx_help#uid:xid1128419:index_advanced:xid389645:xid1391003:xid1568524:xid1568119
Thanks, Benjamin

[@TittarMackan]

Are there any differences for using SOL 401 in this case?

[@benjemmery]

Hi Marcus, no it would be the exact same process. The only reason I used SOL 402 in this tutorial is because I made this video with the same model used in the Gasket Tutorial th-cam.com/video/bktDtCJlmSc/w-d-xo.html which required the use of SOL 402.
Cheers, Benjamin

[@MrEngineerNasa]

But how do you know preload? can i use table to find right preload?

[@MAYAHTT1]

We have consultants and support resources that can help you and can be reached at [e-mail], if needed. As a starting point, for bolted joints between metallic parts it is typical to design for a preload force of 75 to 90 percent of a bolt’s proof strength (proof strength can be obtained from the bolt manufacturer, and can be multiplied by the bolt’s tensile stress area to obtain preload). For a more in depth discussion some well-known references are Shigley’s Mechanical Engineering Design and NASA-STD-5020.