Weird results when bending a beam

Numerical methods and mathematical models of Elmer
Post Reply
tryphena
Posts: 32
Joined: 16 Apr 2021, 17:38
Antispam: Yes

Weird results when bending a beam

Post by tryphena »

I think I got weird results when bending a beam.

I have set the body force as force 3: -1000.
I fixed one end of the beam. And apply load to the other end: force 1: -2000.
I guess force 1,2,3 signifies force along x, y, z direction, right?

I anticipate the beam will bend not only along z-direction, but also along x-direction. But the final result only bends along z-direction. Could anyone please take a look at the vtu file? Thank you!

https://www.dropbox.com/sh/ngv7t9gg9lu7 ... _Gdwa?dl=0
raback
Site Admin
Posts: 4089
Joined: 22 Aug 2009, 11:57
Antispam: Yes
Location: Espoo, Finland
Contact:

Re: Weird results when bending a beam

Post by raback »

Hi

If you use a linear elasticity model I guess the displacement will only be to the direction of the force. You should use the geometrically nonlinear ElasticSolve.

-Peter
kevinarden
Posts: 1090
Joined: 25 Jan 2019, 01:28
Antispam: Yes

Re: Weird results when bending a beam

Post by kevinarden »

There is movement in the X it is just much smaller than the Z. The body force is per volume of the body, and the boundary force is per area of the boundary. Therefore the Z force is many more magnitudes than the X force defined.
tryphena
Posts: 32
Joined: 16 Apr 2021, 17:38
Antispam: Yes

Re: Weird results when bending a beam

Post by tryphena »

Hi Peter and Kevinarden,
I have been able to see the X movement in linear solver when I remove the body force along Z direction.

I also try the nonlinear solver, it works well. Thank you.

Thank you.
Post Reply