Questions about ACCEL Load Type

terran
terran Altair Community Member
edited October 2020 in Community Q&A

Hi everyone, I am currently working on a project in which I have to do a Stress Analysis on a model which is globally accelerated. The acceleration can be considered as quasi static in my case. I am using Optistruct for this analysis. My plan was to use the accels in the Analysis subpanel but I don't really know how to apply the load correctly. After clicking on accels it only gives me the option to determine the magnitude, the relative size and the direction of the acceleration. Does that mean that the acceleration is automatically applied to the whole model? 

I was also wondering if i have to do something regarding the loadstep after creating the accel load. 

Is there a tutorial on how to use the accel loads correctly? That would be really helpful.

Best regards 

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Answers

  • Adriano Koga_20259
    Adriano Koga_20259 New Altair Community Member
    edited October 2020

    If your whole model is subjeted to acceleration like gravity, use the load collector GRAV, define an acceleration valu and direction, and then call it in your Loadstep.

    If you ahave some other loadings besides GRAV, you can use LOADADD to combine this gravity with other regular loads.

  • terran
    terran Altair Community Member
    edited October 2020
    Adriano Koga_20259 said:

    If your whole model is subjeted to acceleration like gravity, use the load collector GRAV, define an acceleration valu and direction, and then call it in your Loadstep.

    If you ahave some other loadings besides GRAV, you can use LOADADD to combine this gravity with other regular loads.

    Thank you for the quick reply. I have now added the acceleration by using the GRAV Loadtype. 

    Now i am wondering though in which scenario I would have to use the ACCEL Loadtype? 

  • Adriano Koga_20259
    Adriano Koga_20259 New Altair Community Member
    edited October 2020
    TimM_22559 said:

    Thank you for the quick reply. I have now added the acceleration by using the GRAV Loadtype. 

    Now i am wondering though in which scenario I would have to use the ACCEL Loadtype? 

    GRAV is a general global body force to be applied in your whole model, with uniform and constant value.

     

    ACCEL and its variants (ACCEL1, ACCEL2) allow you more freedom.

    take a look at the documentation of ACCEL. You can apply a varying accel (non-uniform).

    ACCEL1 and ACCEL2 allo you to apply acceleration in particular nodes only.

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