Roller Support & Part Interaction within Simulation

[Perywinkle]

I'm conducting a simulation of a jack and slide assembly, consisting of parts like a beam, and sheets, that are welded together, along with a separate saddle piece that is placed on top where the load will be focused.

Pictures

From my model I've come across an issue having roller supports since when I test the simulation I've encountered the roller supports resulting in a "Large Displacement", of which I clicked the box within options to account for the large displacement, as well as the rollers pointing downward. However, in the case shown in the pictures I've used reference of geometry along with a translation direction for the roller support, but is this allowed, I thought it dealt with the movement of that piece and I don't know of another way to direct the support force in the opposite direction of the load without doing so.

I'm also not entirely sure on if my connections can be causing this and are resulting in the model not to interact correctly. Especially since I'm having the saddle and the jack & slide assembly beneath it.

In all I'm stuck getting the simulation to run properly without failing, or errors occurring such as "Large Displacement", and I think it might be due to the connections, and fixtures.

 

[mrnsx]

Hi,
If you can post the (part and assembly )files I would be happy to take a look at the problem.
Regards

 

[mmar2087]

Hi Perywinkle.

If i interpret your pictures correct:
- You have an assembly made up of solid elements only (no beams or surface elements).
- You have two loads, gravity and an evenly distributed force.
- You have 2 roller/slider fixtures.
- The only contact is the global bonded one.

If this is correct then your problem with large displacement is rigid body movement.
The roller/slider only locks one degree, in Y-direction.
Even though the force is also specified only in the Y-direction, and movements in other directions shouldn't occur you still need to lock X and Z directions.
Select the point in one corner on the surface where you have your roller/slider fixture and put a "fixed" restraint on this.

Also if you rely on the global bonded contact it assumes that all parts in your assembly are in initial contact with each other. No gaps in your cad file.
Otherwise there will be no contact between the part until you manually add contacts.
Remember also that with bonded contact, the assembly will work as a single body structure in the analysis.
A more realistic approach is to put in no penetration contacts.

Good luck.