General Mechanical

General Mechanical

Bolt Pre Tension and Solution Combinations

    • mergen.eric
      Subscriber

      Hello,

      I am running into a problem using solution combinations to combine multiple analyses that include bolt pre tensions. I am getting what I think are unrealistically high stresses around the bolts and I think it may be caused by the solution combination. If I combine three analyses in a solution combination and each of the three analyses has the same pre tenstions applied (in the first analysis step), does that mean the stresses around the bolt holes will be three times higher than they should be? Is there a way around this or should I not use pre tensions with solution combinations?

      Thanks.

      Eric

    • peteroznewman
      Subscriber

       

      Hello Eric,

      Solution Combinations add stress so if you have three models with Bolt Pretension, then you are getting three stresses added near the bolts.

      Solution Combinations are best used on strictly linear analyses.

      If the bolts were modeled as beams, try using a Fixed Joint to replace each beam.

      If the bolts were modeld as solids, try using Bonded Contact only to joint the bolts to the holes.

      Then all other loads will add together correctly in Solution Combination.

      Regards,

      Peter

       

    • mergen.eric
      Subscriber

      Thank you for confirming my thoughts and thank you for the suggestions.

      Eric

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