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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
    Dear all,
    can someone have a look at my bdf attached to this message?
    This is part of my big assembly. I have decided to leave boltpretension out of the model and try to model it as I did before in Hypermesh/Nastran combination, which means a conservative approach for bolts. A spider for the hole which is connected by a bar.
    Before I have checked the contact setting, before I had a glued contact and no bolts.
    This model worked.
    Now I have added the bolts and change the contact setting from Glued to Touching.
    But somehow this does not work. I think the bolt is somehow not modelled correctly because the analysis run does not converge.
    If this method is working I can have a go ath the big assembly so please let me know what I should change.
    Thanks.
Reply
  • 0
    Dear all,
    can someone have a look at my bdf attached to this message?
    This is part of my big assembly. I have decided to leave boltpretension out of the model and try to model it as I did before in Hypermesh/Nastran combination, which means a conservative approach for bolts. A spider for the hole which is connected by a bar.
    Before I have checked the contact setting, before I had a glued contact and no bolts.
    This model worked.
    Now I have added the bolts and change the contact setting from Glued to Touching.
    But somehow this does not work. I think the bolt is somehow not modelled correctly because the analysis run does not converge.
    If this method is working I can have a go ath the big assembly so please let me know what I should change.
    Thanks.
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