Sequencial analysis in NLtrans

Vidyaprakash G S
Vidyaprakash G S Altair Community Member
edited November 2021 in Community Q&A

Hello sir,

I want to simulate 2 transient analysis sequencially one by one 

first one , Have to do snap fit in 1 second using SPCD 

Second one , To  hold the snaped part in its final position for 1 second 

I tried using CNTNLSUB but after first loadstep the snap action came to its initial position ( like without snapping)

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Answers

  • Gildas GUILLY_21156
    Gildas GUILLY_21156
    Altair Employee
    edited November 2021

    Hello Vidyaprakash,
    I guess you have defined your SPCD through a TLOAD1 in your first loadstep.
    How did you say OptiStruct to keep the imposed displacement on this node(s) for the second loadstep ?
    You have 2 options:

    - Using a TLOAD1+SPCD as well. In such case you will just impose a constant displacement on the node(s) between t=1 and t=2.
    If so, you should consider the TSTIME parameter in the TLOAD1. You can even use the same TLOAD1 for both loadsteps.

    - Using a SPC with the "Fixed" option.
    In such case the philosophy is a little different, as you can apply this to any node on the model, even those that where not constrained on the first load step.

    Gildas

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