Is there any method to apply inital stress state in SOFA?

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  • 27 June 2020 at 13:09 #16723
    nicklj
    Blocked

    Alternatively, is it possible to apply initial strain state / orthotropic thermal expansion to apply some kind of pre-stretch in soft material?

    Thanks a lot.

    27 June 2020 at 13:32 #16725
    Noura
    Blocked

    Hi nicklj,

    Have you tried the restScale parameter in MechanicalObject.h ?
    Data< SReal > restScale;

    Example:

    <MechanicalObject name="MO" src="@MO_loader" template="Vec3d"  restScale="0.8" />

    default value equals to 1.

    Best,
    Noura

    27 June 2020 at 14:16 #16731
    nicklj
    Blocked

    Dear @Noura

    Thanks a lot for your reply. It seems something I need. I’ll take a look and see whether it is possible to extend with 3 different component.

    Another question regarding to the implementation. I’d like to introduce two plate with different mateiral. They are stick together, and I need to introduce prestretch on only one of them. Is there a function in SOFA to define two surface tie/stick with each other?

    Thanks.

    7 July 2020 at 22:59 #16820
    Hugo
    Keymaster

    Dear @nicklj

    You can in general define rest positions which are different from the initial position, thus inducing some stress after the first step.

    How are you two plates sticking to each other? 1) is this like ligaments (springs) or 2) rather inseparable from another?
    For 1) I would use linear or polynomial springs
    For 2) I would use bilateral constraint or attach constraint

    PS: I do not remember asking this question: are you in any way related to Dr. S. Marchesseau at A*STAR? Could you tell us more about your research? if you prefer you can share these information in PM

    Best,

    Hugo

    8 July 2020 at 11:45 #16837
    nicklj
    Blocked

    Hi, Hugo,

    Thanks a lot for your answer. I think that is something I need.

    Sorry I did not successfully find where is the PM function….. Could you PM me first so I can reply, or may I know you email address so I can send you email?

    Best regards,
    Liu Jun

    8 July 2020 at 21:37 #16843
    Hugo
    Keymaster

    Dear @nicklj

    I will contact you directly then, no worry.
    Glad if it helped. Let us know whenever your problem is definitely solved.

    Best

    Hugo

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