Flex Body Assign Problem

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

Hello All,

 

I have been trying to build a full model which flex bodies, contacts included but when I assigned a flex body to rigid body , contacts are no longer available. Is there any specific contact type that I have to use for flex bodies ? and the other question is my material will be rubber and I want to examine how those components assigned flex body distorted ? Can I examine that kind of solution via MotionView ?

 

Thanks in advance :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

Answers

  • Chris Coker_21312
    Chris Coker_21312 New Altair Community Member
    edited March 2019

    Hi Abdullabh-

     

    To answer your second question, the math behind flexbodies is based off of linear deflection, and linear material properties.  You will not get good results attempting to model a rubber component as a flexbody.  If you need to model something like a rubber component, you should investigate using the non-linear finite element feature in MotionSolve (NLFE). 

     

    For your first question:  MotionSolve does not currently support 3D contact with flexbodies today.   There is a workaround to this, where you attach many small rigid bodies to your flexible body with fixed joints.  These small rigid bodies can then be used with 3D contact.

  • Simon Križnik
    Simon Križnik Altair Community Member
    edited March 2019

    Expanding upon @Chris Coker suggestions: NLFE bodies in Motionsolve currently support only 1D BEAM12 elements for Hyperelastic materials (Neo-Hookean, Mooney Rivlin and Yeoh).

     

    Highly nonlinear models can be solved by an explicit method (Radioss):

    -geometry (large displacements, rotations, buckling) 

    -material (hyperelasticity, plasticity and rupture)

    -contact (sliding, friction, open/close status)

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2019

    Thank you for your answers @Chris Coker and @Ivan. They really helped me to expand my point of view.