Does anyone have an API for triaxial test DEM simulations?

bigshow
bigshow Altair Community Member
edited June 8 in Community Q&A

Does anyone have an API for triaxial test DEM simulations?

It’s too difficult for me to figure out triaxial calibration in EDEM!

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Answers

  • Stephen Cole
    Stephen Cole
    Altair Employee
    edited June 8

    Hi,


    Just to note we don't have this as an example on the EDEM side, I'll leave it with the community to comment if there is an example anybody can share.


    With the API you can apply forces to specific particle ID's or named particles, so you could write a model to apply a radial force to a set particle type (the outer particles).  The API usage is covered in the EDEM Tutorials


    Regards

    Stephen

  • bigshow
    bigshow Altair Community Member
    edited June 8
    Stephen Cole_21117 said:

    Hi,


    Just to note we don't have this as an example on the EDEM side, I'll leave it with the community to comment if there is an example anybody can share.


    With the API you can apply forces to specific particle ID's or named particles, so you could write a model to apply a radial force to a set particle type (the outer particles).  The API usage is covered in the EDEM Tutorials


    Regards

    Stephen

    Thanks for your reply

  • Roboto
    Roboto Altair Community Member

    I am also trying to perform a triaxial test in EDEM. I have been following the example presented in this webinar:

    Webinar: Experimentally Validated DEM Model of a Triaxial Test on Railway Ballast Utilizing the Multi-sphere Approach — Altair Community

    To do this, you will need to use the EDEM API, as you mentioned. This video shows you how you can modify the EDEM API scripts. You can follow this general procedure to create an API script to get the behavior you need for the confining pressure:

    Intro to EDEM API - Part 1 - YouTube

    The example given in the Program Files>Altair>2023>EDEM>src>Api>ParticleBodyForce folder on your computer is a good starting point.

    The part I am stuck on is getting the membrane to behave correctly. In the webinar, the membrane stretches uniformly:

    image.png

    However, when I try to replicate the simulation in EDEM, the bonds break near the rods and the center particles do not stretch:

    image.png

    I am using the Bonding V2 contact model and have tried many different bond parameter configurations including maximizing bond strength and increasing the bonded disk scale. So far, nothing I have tried has worked. I was wondering if anyone had any suggestions on how to achieve the desired behavior? Thank you so much!

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