G Loads for Half Symmetric FE Model

[struclearner]

G (Gravity/Acceleration) load, for Half FE Model, utilizing the symmetry of the structure, will be the same as for full model, because the g loads produce inertia force calculated from F = ma, on the structure.
I appreciate, your inputs and valuable suggestions, if this is not the case.

 

[FEA way]

Yes, when using symmetry you can still apply gravity load normally. It will be based on the mass of the modeled portion of the structure.

 

[struclearner]

Thanks, FEA Way

 

[GregLocock]

Check your assumptions by building a very simple model as a full and symmetric model then check that the results are identical. if not then you have more to learn. In my experience exploiting symmetry often leads to tears (more generally BCs are the usual issue with FEA models, not the meshing bit).

Cheers

Greg Locock


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[rb1957]

a 1/2 symmetric model requires symmetric loads (ie you can't model rolling manoeuvres, only pitch manoeuvres).

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[Denial]

Struclearner.[ ] What you assert is generally true, but does not apply to any elements that lie entirely within the symmetry plane.[ ] Special treatment is required for these.

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