Rubber compression Simulation

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

I am simulating a rubber component where rubber has a self - contact as it compresses, but i can see through animations that elements are intersecting and penetrating.

I have defined type 19 self -contact (with Istf=4 and inacti 6 and igap =1) by using surf cards via components.

and used mat 42 as material card and Isolid 24 as formulation. with material property.

The model is in volume cavity and can only displaces in gap  between it and load is applied horizontally by displacing a rigid shell along outerbody in horizontal direction and rigid element with internal nodes of rubber is fixed in space.

image.png.3352c24334090b43b0b07da3b92f74dd.png

 

Cut -section displacement <2mm (gap is 2mm) and element start to deform at before gap reduction

 

image.png.1544aaddc018d8c0309da1a87ff19448.png

 

element distortion and time step is reducing .there is penetrations and intersection between elements despite self-contact

image.png.796a8b5ebaaea6264c2c6626c6b0aa2f.png

 

what should be contact parameters or any other input to avoid such behaviour? 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    Hi,

    Please try creating this self interface with Type 24 interface, with Istf=4 and Stmin of 1000N/mm, let us know the outcome also.

    If the issue persist please share the model file and .h3d also.

     

     

  • harshitpuri
    harshitpuri Altair Community Member
    edited April 2018

    I created in interface 24 by using same methodology by using surf_ext card using component but i get following warning , it seems the solver has removed contact as penetrations is observed in animations.

     Also the forces in my model are below 1000 N as shown in graph above so i avoided stmin for now.

     


       INTERFACE NUMBER :         3 group1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

    WARNING ID :         1022
    ** WARNING WITH SURFACE S1 S2 INPUT IN TYPE24
    DESCRIPTION :  
       -- INTERFACE ID : 3
       -- INTERFACE TITLE : group1
       SURFACE S1 S2 INPUT ARE IDENTICAL
       CHANGE TO ONE SURFACE INPUT : S2=0

     

    image.png.88ce5638f3b97be4d14f9e14b2a3dc6e.png

     

     

    image.png.6f1e05a962300c04d931a174be8d48aa.png

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    Hi,

    Can you please share the model file along with the .h3d so that we can review the model.

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