pressfit analysis with static load subcase

Sid_22073
Sid_22073 Altair Community Member
edited September 2023 in Community Q&A

Hello,

In optistruct, I want to simulate a  load by taking account of the interference fit at a sleeve location.

How to run  this into two seperate subcase?

I would like to use static case for better solving time is this ok, or I need to use NLSTAT for both cases

can you please help me with an example solver file.

image

Thanks,

Sid

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Answers

  • Robinson Ferrari_20451
    Robinson Ferrari_20451
    Altair Employee
    edited September 2023

    Hi Sid,

    Please see attached a small deck showing how to do this.

    I'm using the model in this example from here: link

    I added a new subcase continuing from the interference fit subcase.

    In this model, a negative clearance is being used to resolve penetration (which is often used to help with convergence). In subcase 2 it is necessary to use CNTNLSUB to continue from the previous subcase, which means that both subcases must be of the same type: NLSTAT SMDISP or LGDISP.

    Hope it helps you. Consider marking this answer as correct if it solves your problem, so other people may be helped too.

    Thank you very much

     

  • Sid_22073
    Sid_22073 Altair Community Member
    edited September 2023

    Hello Robinson,

    Thanks for the answer so far.

    Sorry for late reply, I was preparing the model these days. 

    I checked your model, I see there is physical geometrical interference of 20mm, so below is the PCONT is used in your file.

    PCONT          2                0.0             -20.0   YES    

     

    But, In my model, I do not to have any physical interferece between geometries, I mean the geometries are just touching each other without penetration.

    In my case, how can I input the interference fit value ? 

    Looking forward for your answer.

    Kind regards,

    Sid

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