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fstopelli-214-Alexandrite
14-Alexandrite
January 24, 2019
Question

Simply Supported beam

  • January 24, 2019
  • 1 reply
  • 2221 views

Hello, 

with a simply support beam, these impostations are correct?

I have this doubt becouse if I try to fixed rotation and traslation obtain these message;

like the beam is yet fixed....

 

Sorry if it's not clear

1 reply

S
SweetPeasHub17-Peridot
17-Peridot
January 24, 2019

It is not possible to constrain rotations on 3d solid elements.  Try to understand that if the top edge of the beam is held in X and the bottom edge of beam is held in X then no rotation can happen.

 

Instead use a shell element beam or just use beam elements.

If you must have 3d then you have some choices, here are some.

1. come up with a system of 1D/2D elements connected to your solid model with some type of link (rigid or weighted).  Apply the constraint to the 1D/2D elements to be free in the rotation needed.

2. only hold the bottom edge of beam, rather than face (this creates a singularity- create a small volume region  near and including the edge as a very stiff material)

3. hold end surface only in the "y" restrained translation direction and then restrain the rigid body motion using either inertia relief or this technique.

https://community.ptc.com/t5/Simulation/Simulation-of-a-lifting-CE/m-p/545154/highlight/true#M220

 

 

 

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