Have you defined BONDED contact sets between the rib and the rest of the body while using shell mesh?
It could be that the rib is acting as a free body, hence it is not properly restrained leading to that error.
Yes, indeed shells and solids must be bonded with a local contact set
If you turn on 'soft springs' you will see that the global bond between the shells and solids fails. The large displacement of the shelled parts shows that.
Don't forget to turn it off again, or else your results are incorrect.
Hi David and Janko,
Thank you for the advice.
Yes, each rib is bonded using an individual component contact. I am not using global bonding. Should I be using contact sets instead of component contacts?
When I added soft springs to the model, the model still would not run.
When the model failed with the soft springs, I activated the non-touching faces option in the bonded contacts dialog with a 3mm maximum gap, which is about 0.5 mm larger than the gap between the midsurface of the body shell and the edge of the rib. I thought that the gap between the body shell and the ribs might be causing the software to fail to detect the contact. After making this change, only one of the ribs appeared not to be bonded, dropping through the model about 8 km. All of the individual component contacts are identical, so I do not know why only one appears to have failed.
Also, why would component contacts work when the ribs were solid, but not when they were shells if the geometry was identical?
I should add that I am using SolidWorks 2015 x64 SP1. My company has two licenses for SW Simulation, one Professional, and one Premium, and I pull whichever one is available.
Windows 7 x64 Professional SP1
Intel Core i5-3470 CPU @ 3.20 GHz
20 GB RAM
Intel HD Graphics 2500
Don't use a component contact, but a local contact set on each individual bond, so edge to face.
If after that you still have troubles, then go to properties and set 'incompatible bonding options' to 'more accurate', there has been some buggines on the bonded contact lately.
And if all that doesn't work, try to save the model as a parasolid and setup your simulation again. But I believe that shouldn't be necessary.
Thank you Janko,
I revised the model to have shell edge - solid/shell face pairs for the body shell x rib contacts.
It is working now.