How can I contract an object?

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  • 9 April 2021 at 14:20 #19105
    SergioPM23
    Blocked

    Hello everyone!
    I have created an elastic object which I want to compress in a simulation. I have tried to apply external force fields on opposite faces of the solid, but it didn’t work (I think that happens because the resultant force is 0). I would like to know if there’s any instruction or any plugin I could use for this task.
    I look forward to any response and I would appreciate any help.
    Thanks in advance

    Sergio.

    9 April 2021 at 14:58 #19106
    Hugo
    Keymaster

    Hi @sergiopm23

    Interesting to see that muscle contraction is a rising topic.

    The contraction of an object is a so-called active mechanical model. I guess some field will induce the contraction, and contraction law might exist to define how this field relates to contraction forces. This active constitutive law must be integrated using the FEM as the usual passive part (i.e. elasticity).

    One classical model is the Hill muscle model, but I guess many others do exist. I know a team implemented a part of a similar contraction in a private plugin.

    Best wishes,

    Hugo

    13 April 2021 at 07:26 #19150
    SergioPM23
    Blocked

    Hi Hugo.
    Thanks for your response. Could you give an example of a field that induce contraction?. I am trying to contract the object using two additional objects that push (ConstantForceField) the object I want to contract from opposite faces, but what I can see so far does not look like a contraction at all.
    Thanks in advance.
    Sergio.

    16 April 2021 at 00:10 #19190
    Hugo
    Keymaster

    Hi @sergiopm23

    No contraction model has been yet implemented in the open-source version of SOFA, but it would be most interesting! IMO approximating such a model with a constant forcefield sounds too approximated.

    The contraction model must be implemented using the FEM as a forcefield in SOFA. An example of such a model FEM integration is available in this paper. Do you see how to proceed?

    Best

    Hugo

    22 April 2021 at 08:54 #19267
    SergioPM23
    Blocked

    Thank you for your response Hugo. I am going to read the paper and try to implement the model in SOFA. I will write in this post if I have any doubt.

    Sergio.

    23 April 2021 at 17:16 #19288
    Hugo
    Keymaster

    Anytime @sergiopm23
    Looking forward to hearing from you!

    Hugo

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