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