Time for simulation

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

I applied force on a component/assembly and wants its stress results ?For how long i should run the simulation ?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi,

    Normally  starting from a zero load we gradually ramp up the load until we achieve the desired total load. This gradual ramping up the load from a value close to zero is often a more robust approach for solving nonlinear problems. And we run the simulation for this total time over which we ramped the load.

    Please go through https://altairuniversity.com/learning-library/7-guidelines-to-apply-quasi-static-load-in-explicit-simulation/ which are the Guidelines to apply Quasi-static Load in Explicit Simulations.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    I mean to say that if when we run the analysis for more than the loading time,the software continuous to give results.Many times the stress value go on increasing after the loading time. Means we get higher and higher stresses (multiple peaks as the time proceeds ) when we run the analysis for more than the loading time.what does that mean and also how to decide the run time of analysis ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi,

    When you run the model for more time the load keeps on ramping on the model and that's why it shows higher values when it runs for more time.

    The run time for explicit analysis will be very less, that is milliseconds and so we normally ramp the load in milliseconds and will run for the same time.

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.0e69f753a1c0b1978793198a50873429.png

    What to do with this type of situation ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi,

    You can apply a /CLOAD at the node with this load. Create a function for this curve and you can simulate the same.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    I mean for what duration i should run the simulation,if let say my load is for 5 millisecond(triangular portion) ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    one more question Total force= number of nodes*Force per node ?Is it valid for solid element also ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi,

    Yes, the force is applied to each node individually.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    what duration i should run the simulation,if let say my load is for 5 millisecond(triangular portion) ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi,

    Normally we run the simulation for the loading time only.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Is it not dependent on size of component ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi,

    It's not dependent on the model size. The loading will happen based on the function provided.

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