Element Penetrate

jerometeoh

Good evening,

I am simulation 3pt bending test. I physically model the steel rod, and defining contact card between the substrate surface and rod.

Not sure why it is penetrating.

Also, I am modeling the laminated composite as a 2D shell element? Is there a way to visualize it in 3D during the post processing?

Especially the stress result?

 

Thanks,

Jerome.

Robinson Ferrari_20451

If you are running in small displacement, be sure the search distance is enough to create the contact pair. Otherwise, the contact will not be updated throughout the solution. For linear, you can consider what AM has mentioned.
Another important point is to check if you are considering the shell thickness in your search distance (by default OptiStruct uses GPAD = thick).
I believe in this case large displacement should be the best choice for 3pt bending test. So, use PARAM,LGDISP, 1, and select track=CONSLI for the contact pair (keep in mind to take into account the shell thickness). Let us know if it works for all, and consider marking the answer as correct. Thank you.

AM_20700

Complete noob here, so take my reply with a hefty serving of salt.

Is this a linear analysis? If so, the contact will be assessed at the start of the simulation and remain in that state throughout the simulation. If your search distance is too small, the contact will be set to "open" and will not update as the components get closer.

Robinson Ferrari_20451

If you are running in small displacement, be sure the search distance is enough to create the contact pair. Otherwise, the contact will not be updated throughout the solution. For linear, you can consider what AM has mentioned.
Another important point is to check if you are considering the shell thickness in your search distance (by default OptiStruct uses GPAD = thick).
I believe in this case large displacement should be the best choice for 3pt bending test. So, use PARAM,LGDISP, 1, and select track=CONSLI for the contact pair (keep in mind to take into account the shell thickness). Let us know if it works for all, and consider marking the answer as correct. Thank you.