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Edge to surface contact modeling problem

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samuele.libralato
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(@samuele-libralato)
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Hi everyone, I'm new here. I'm trying to model a contact between a screw, bolted in a sandwich panel, and composite skins which compose the panel faces, with a shear load applied to the screw. I do not find the best way to model the contact between the edge of the skins hole and the surface of the screw. I attached a simplified exemple of my model below.

Thanks in advance

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samuele.libralato
Posts: 3
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(@samuele-libralato)
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I tried to reduce the contact speed from 30 mm/ms to 2 mm/s with a thin solid plate and the contact happens. May it be a problem related with high speeds?

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Negative Volume
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@samuele-libralato

Try to make a surface to surface contact between the two parts so *Contact_automatic_surface_to_surface 

And add the options: Soft=2 and Depth=5

See if that helps

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samuele.libralato
(@samuele-libralato)
Joined: 3 years ago

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@negativevolume

Yeah there’s contact!! Thank you. Can I ask you (if u know) why softening factor could help?

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Negative Volume
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Posts: 554

@samuele-libralato

Great news! Soft=2 and depth=5 is usually my go-to setting for any contacts that I'm having issues with. You can use it for single_surface contacts as well as surface-to-surface. 

Soft is just a label, it's not actually softening the contact. Soft=2 changes the contact to a segment-based contact, not figuratively but mathematically. What I mean is that figuratively, you can define a contact with segment sets, but soft=2 is changing how contact is detected between surfaces. This write up will go deep into the details:

https://www.dynasupport.com/howtos/contact/soft-option

I'd also suggest using this page as a guide as well. It's a lot, but can be helpful. And of course, feel free to ask if you have any more questions!

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

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