Model Penetrates Master Surface during compression

ARUNS_21340
ARUNS_21340 Altair Community Member
edited October 2020 in Community Q&A

Hi,

 

I am trying to model compression (IMPOSED DISP) of a bead (LAW40) between platens (LAW2) in radioss. Top and bottom contacts are defined using INTER/TYPE7 with the following values (Istf-4, Inacti-6, Iform-2).

There is no penetration at the bottom contact, whereas penetration of bead into the top plate is seen.

 

Any suggestions to overcome this issue?

 

Thanks,

Arun

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<?xml version="1.0" encoding="UTF-8"?>2.png

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Answers

  • Simon Križnik
    Simon Križnik Altair Community Member
    edited April 2020

    Hi,

     

    make sure there are no initial penetrations and intersections.
    There are 2 possible reasons for penetrations during the run:
    -the edges are not detected because Interface type 7 does not deal with edge to edge impact. Define an additional symmetric type 7 interface or type 11 or 19 interfaces.

    timestep4.jpg

    -there is a large difference in stiffness between contacting components

    5a5755ed896e0_softpart.jpg.129dbc112a7f298c87c3c015678f04e3.jpg

    Share the model, if the issue persists.

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