How to allow a rotation in a static simulation

[Anonymous]

Hi everyone!

I need some explication about the links we put in the design part and the simulation part.

In my case, I am working on a bucket of a loader that allow a rotation (to fill the bucket of sand for exemple). So this rotation existes in the design part and it's blocked between -40° and 40°.

Then I applied forces in the simulation part (soil loads and pistons forces).

What constraints should I add so that the bucket doesn't deformed but rotates (at least until 40°, which is the limit) before it deforms itsefl? 

Thank you for your help

Sarah

[Marcin_Kosciolek]

Hi @Anonymous 

When simulating any design with FEM we need to remember that joints we put into our model don't work in simulation workspace. FEM analysis requires constraints and contacts instead of joints. To resolve your problem using basic static simulation, you can create a few studies with various setups (bucket of the loader set up for -40°, -20°, 0°, 20°, 40° for example) and then taking the worst scenario to evaluate the design. Regarding constraints in your design. I am not sure if the pin body is necessary. You can remove that and apply a fixed constraint to the pivot bushings faces. Also, I think, forces from the cylinder should be applied to the other two pivot bushings faces instead of the bucket. I would also check contacts to make sure the whole structure is correctly connected.

However, if you want to perform the whole movement in one simulation, you need to use a study called "Event Simulation". It allows you to create both dynamic and quasi-static (without inertial effects) analyses.

But important thing is that you can apply prescribed displacement or rotation. In addition, because this type of study uses increments to solve the problem, you can create transient loads which can be controlled by a defined curve.

However, you have to know, that "Event Simulation" requires paid cloud credits, and it can be calculated only in the cloud.