FEA x Analytical
FEA x Analytical
(OP)
Hello everyone,
I've performed an FEA and a hand calculation of a beam under simple load:
FEA (solid):
http://files.engineering.com/getfile.aspx?folder=1...
Beam element:
http://files.engineering.com/getfile.aspx?folder=4...
It's very simple calculation, but in FEA I had a doubt about how to understand where is the exactly main stress.
In this situation it's easy to find the exactly region with the main stress, because I can find the result through a simple hand calculation but and if the geometry isn't simple with several radius?
As you can see, the beam element gave me the exactly value in the exactly region which doesn't happen with FEA (solid).
Software used: Creo Simulate
Mesh: 0.5mm
Thanks in advance:
Henry.
I've performed an FEA and a hand calculation of a beam under simple load:
Quote:
Diameter: 20mm
Lenght: 200mm
Load: 1kN
Thus:
I: 7850mm^4
Stress: 254MPa
FEA (solid):
http://files.engineering.com/getfile.aspx?folder=1...
Beam element:
http://files.engineering.com/getfile.aspx?folder=4...
It's very simple calculation, but in FEA I had a doubt about how to understand where is the exactly main stress.
In this situation it's easy to find the exactly region with the main stress, because I can find the result through a simple hand calculation but and if the geometry isn't simple with several radius?
As you can see, the beam element gave me the exactly value in the exactly region which doesn't happen with FEA (solid).
Software used: Creo Simulate
Mesh: 0.5mm
Thanks in advance:
Henry.





RE: FEA x Analytical
the solid model is going to give you a lot more local results than the beam model ... it'll detect the local stresses due to a point load, that the beam model doesn't
another day in paradise, or is paradise one day closer ?
RE: FEA x Analytical
I really constrained all freedoms at one of the extreme. Do you know how could I improve this condition ir order to get a result more accurate?
Henry.
RE: FEA x Analytical
constrain one node (any, maybe the one at the center) in the other two directions, "y" and "z" and in "Rx" (or take out Rx as a couple of y or z forces.
another day in paradise, or is paradise one day closer ?
RE: FEA x Analytical
Constraining all the nodes might be fine in this case. In Nastran, if you were to use CBEAM element for your bar element application, your solid model would probably match these results then.
Think of your beam element, and imagine it as a solid model. What is your actual boundary condition on that beam and how can u represent this in solid FEA?
If you can't work this out, I would advise you to try this with an I-beam. That will teach you more..
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: FEA x Analytical
RE: FEA x Analytical
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer