Collision Detection

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

Hi,

 

I used collision detection tool to find the intersection and penetration on the model.

In my model there is a gap of 5mm between two components, but in collision detection tool its showing as a penetration as indicated by vectors.(as in below image)<?xml version="1.0" encoding="UTF-8"?>collision1.thumb.JPG.d8b2b28fe7d94f948f387a64469bc8f7.JPG

 

Secondly, within the same component its showing as penetration as indicated by vector arrows. (Image attached below)

<?xml version="1.0" encoding="UTF-8"?>collision2.thumb.JPG.89eb7b06387130d8f305d925ebc2a789.JPG

 

But when checking with the simple intersection tool (Analysis>safety>intersection) these are not shown.

 

How to resolve these.

 

Thanking You.

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Answers

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

    Hi,

    Penetration is the overlap of the material thickness of shell elements. You can check the thickness of components.

    The penetration depth also seems more in this case.

     

     

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

    Thanks George,

     

    So, is it important to consider the thickness overlapping also?

     

    But in my second query, in a single component also its showing penetration, as there is no other component to thickness overlap.

    <?xml version="1.0" encoding="UTF-8"?>collision2.thumb.JPG.f0353a65491f09112e09b3745d36b474.JPG

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

    Hi,

    In the second case are you considering any self interface?.

     

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

    Hi,

     

    There is no interfaces present now in the model

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

    Hi,

    Please share the model file through the secure dropbox.

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

    HI George,

     

    Shared the file.

     

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

    Hi Pritam,

    Please check your mail as I have shared you my observations.

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

    Hi George,

     

    Sorry to say that I have not received the mail.

    Please resend or use this mail id: pritam.patel11@gmail.com

     

    Thanking You.

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

    Hi George,

    I have seen your mail.

    As I noticed you have not given any thickness, as there is no thickness assigned to any components till now.

    If uniform thickness(say 10mm) assigned then there are penetrations. Can we ignore the thickness penetration between 2 components??

     

    And regarding the contact, there is a fixed connection between all three components. I don't think TYPE 11 will provide a fixed contact as TYPE2

     

    Thanking You.

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

    Hi,

    It's always recommended to clear all the penetrations in the model, else it may result in wierd model behavior which could result in run termination due to time step drop.

    If you have a kinematic condition between components you can define Type 2 interface between those components.

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