Contact in 3PB Sandwich

Altair Forum User

Hi,

I've a problem with my 3PB model of a sandwich structure (honeycomb core). Contact between sandwich structure and supports isn't realistic. I set contact in 'SLIDE' but the result is wrong. So I obtained a displacement of 177 mm with a force of about 15000N, not real. I can't also view the results of CFAILURE, but I've set it in output requests.
Can you take a look to my model? 

Thanks in advance. Hearing from you. 

Regards. 

Unable to find an attachment - read this blog

Pranav Hari

Hi michel

 

Can you try this in Radioss? Defining such contacts and interface is easier in Radioss.

You can also refer the tutorial RD-T 3595 from Radioss help, which is similar to your case

 

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

I'll try it. 
Thank for your answer

Simon Križnik

Hi Michel,

 

Sliding contact might not work using linear static analysis. In linear static analysis, the contact status does not change, does not slide and the contact stiffness is constant throughout.

It is advisable to equivalence the sheet panels to the core instead of using the freeze contact.  

 

The load and consequently displacements are so high it can be solved more efficiently in Radioss. Given the loads and BCs are symmetric you could reduce the model to a quarter for computational efficiency. 

 

I have set up your model with imposed displacement of 10mm using NLSTAT analysis.

Unable to find an attachment - read this blog

Altair Forum User

Hi Ivan,

 

I got it.
Thanks a lot for your explanation. I'll use RADIOSS.