Beam_to_Shell_Edge ...
 
Notifications
Clear all

Beam_to_Shell_Edge Contact  

 

MEEES
(@meees)
Active Member
Joined: 2 weeks ago
Posts: 5
July 22, 2020 11:03 pm  

Dear Everyone,

I am modeling contact between a beam element and a shell edge but I am not satisfied with the response. 
From the figure, it seems that the beam is reflected back without physically touching the shell edge.

The contact keyword I selected is Automatic_General as it can be seen from the pictures attached. Can you please tell me what is going wrong?

1595455391-Capture2.png
1595455460-Capture1.png
1595455477-Capture3.png
This topic was modified 2 weeks ago 2 times by MEEES

Quote
Topic Tags
Negative Volume
(@negativevolume)
Estimable Member Admin
Joined: 2 years ago
Posts: 246
July 26, 2020 2:18 pm  

Hi @meees

So by beam, you are talking about that blue part correct? Because that does not appear to be a beam element (1D) unless you have some visualization on. Is that a 2D or 3D structure?


ReplyQuote
MEEES
(@meees)
Active Member
Joined: 2 weeks ago
Posts: 5
July 27, 2020 10:23 am  

@negativevolume thanks for replying!
The blue part is a beam element, but yes you are right, the visualization is on! In this case, everything is happening in a plan.


ReplyQuote
Negative Volume
(@negativevolume)
Estimable Member Admin
Joined: 2 years ago
Posts: 246
July 27, 2020 4:36 pm  

@meees

ah I see. Well there is a contact that works for beams to surfaces: *Contact_Automatic_Beams_to_Surface

Now I’m not sure if it will work for that edge but it’s worth a try. You may also want to try to add the following options to that contact. Soft=2 and Depth=5.

 

This may also be of use:

https://www.dynasupport.com/tutorial/contact-modeling-in-ls-dyna/edge-to-edge-contact

I hope one of these works for you!

 


ReplyQuote
MEEES
(@meees)
Active Member
Joined: 2 weeks ago
Posts: 5
July 27, 2020 9:57 pm  

@negativevolume I have tried this contact before but does not work correctly as it considers that the edges of beams are defined based on an equivalent radius and not where they actually are. If you use the offset option does not work. Also, soft=2 is not allowed for this type of contact.


ReplyQuote
Negative Volume
(@negativevolume)
Estimable Member Admin
Joined: 2 years ago
Posts: 246
July 27, 2020 10:31 pm  

@meees

I’m not sure what you mean by that first point. The thickness of the beam should be taken into account for the contact unless you define a value for SST or MST (contact thickness). 

Those parameters are recommended for edge to edge contacts so I figured it was worth a shot.

Also, doing some more research you answer may be in the last paragraph of this link. Use *Contact_General and at 1D null beans are the boundary of those shells and make the contact between the current beam and these new null beams

https://www.dynasupport.com/howtos/contact/contact-between-beam-and-shell-elements


ReplyQuote
MEEES
(@meees)
Active Member
Joined: 2 weeks ago
Posts: 5
July 27, 2020 10:39 pm  

@negativevolume Thanks for the link. The thing of the offset does not work well in this case, have a look here:
https://www.dynasupport.com/faq/contact/how-can-i-handle-contact-between-beams-and-shells


ReplyQuote
Share: