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Definition of Pretension Analysis

User: "Altair Forum User"
Altair Forum User
Altair Employee
Updated by Altair Forum User

Hello,

 

I tried to simulate a pretensioned bolt. The model contains two rigids & a CBEAM that connects them. I open the Tool --> pretension manager and apply a pretension Force to the CBeam. When starting the analysis, this force is neglected however. What would be the right way to use the pretension manager & force on my model? There is a testfile attached to reproduce the issue (please rename from jpeg to *.hm).

 

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    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Hello,

     

    I had a look at the model and the pretension force through the Pretension manager tool is defined correctly. However, you must reference this force in the 'loadstep/ subcase' also as a 'PRETENSION' entry and not as a 'LOAD'. If you change this in your subcase, the model will perform a correct analysis.

     

    As you also asked for tutorials, here are some descriptions of pretensioned bolt analysis:

    OptiStruct Solver Help > User's Guide > Modeling Techniques > Loads and Boundary Conditions > Pretensioned bolt analysis

     

    OptiStruct Tutorials > OS-1390: 1D and 3D Pretensioned Bolt Analysis of an IC Engine Cylinder Head, Gasket and Engine Block System Connected Using Head Bolts

     

    Best Regards

     Jan

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