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Help!!! Fastest way to define contacts?!!

User: "Sebastian Yang"
Altair Community Member
Updated by Sebastian Yang

Hello,

 

I have a model with multiple components that consists of a outer case and several internal components, 

image

 

I want to define type 7 symmetric contact for all of them because I think there is a possibility that each one of them comes into contact with each other, 

but right now I have to define a lot of contacts for each pair of components, for instance, green´s nodes with blue's elements, green´s nodes with orange´s elements, etc. This is really time consuming.

Is there a way to define type 7 for all possible combination of components? An option where you insert a bunch of components and the program would define type 7 contact for you?

 

(I have seen something similar in this tutorial, on step 9.2 it defines a single type 7 contact which includes 8 components, which seems insane to me https://2021.help.altair.com/2021.2/hwsolvers/rad/topics/solvers/rad/front_impact_bumper_hm_r.htm#ariaid-title11)

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    User: "Michael Herve"
    Altair Employee
    Accepted Answer
    Updated by Michael Herve

    Hello @Sebastian Yang ,

     

    is there any specific reason why you want to define a separate type7 contact for each pair of contact? For explicit analysis, the best practices today is rather to define one single contact per sub-assembly, with all components of the same sub-assembly being slave and master of the interface.

    From a pure performance point of view, having a unique contact instead of multiple contacts is also better.

    One of the main (not to say the only) reason to create a contact per pair is if you need to extract contact forces for each pair of component. If you do not need to output these contact forces, then you can go with the single contact. If you need some contact forces, then you can use /INTER/SUB. If that can help, there is a macro in Community that can help for populating these /INTER/SUB cards:

    https://community.altair.com/community/en/creating-sub-contacts-for-radioss-general-contacts?id=kb_article&sysparm_article=KB0122363

     

    Hope that helps,

    Michael