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Modeling of Bolts

ron.kunz
Dear all,
I have a big assembly and want to model bolts in the complete assembly. What is the best and accurate way to model this.
Cbar analysis is accurate enough to analyse the bolt forces. Boltstress is of secundair interest.
Are there examples for these bolts?
In addition bar orientation for this CBAR property, how can this best be modeled?
 
Thanks in advance
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  • 0
    Ron, there is a bolt preload example in the Nastran Demonstration Problems Manual (Chapter 23, Bolted Plates). I extracted and attached an excerpt for you. Note: this example uses solid elements for the plates and bolt. You can model the bolt with bars/beams using the same control node process to define the preload (with a force or displacement).
    Also, this uses SOL400 to simplify the process of locking the preload force as a displacement. You can do the same with SOL 101, but it takes a couple of runs. First you run with the preload force only -- to get the required displacement. In the second run, you replace the preload force at the control node with that displacement, and add your other loads in the same subcase (pressure in the example).
    Attached Files (1)
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  • 0
    Ron, there is a bolt preload example in the Nastran Demonstration Problems Manual (Chapter 23, Bolted Plates). I extracted and attached an excerpt for you. Note: this example uses solid elements for the plates and bolt. You can model the bolt with bars/beams using the same control node process to define the preload (with a force or displacement).
    Also, this uses SOL400 to simplify the process of locking the preload force as a displacement. You can do the same with SOL 101, but it takes a couple of runs. First you run with the preload force only -- to get the required displacement. In the second run, you replace the preload force at the control node with that displacement, and add your other loads in the same subcase (pressure in the example).
    Attached Files (1)
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