bending or shear?
bending or shear?
(OP)
When we look at FEA results, is there any way to cleary determine what is dominating the results e.g. it is bending or shear? I am performing FEA and wants to know if it is bending dominating or shear by looking at output, stress.





RE: bending or shear?
Are you talking about a shell or plate problem? In that case, there are two types of loading: bending-dominated and membrane-dominated. Is that what you mean?
Nagi
RE: bending or shear?
RE: bending or shear?
corus
RE: bending or shear?
RE: bending or shear?
One qualitative estimate would be to plot the stresses at the shell midsurface and the stresses at the top (or bottom) surface and to visually compare the results. Regions where there is not much difference are membrane-dominated while regions which have a big difference are bending-domninated.
Nagi
RE: bending or shear?
as you already know, stress depends on the area and force. if you are familiar with the geomtry of your fem, then check the output force. this way you actually see the diffenece between the two loads (bending or shear).
when comparing shear and bending its probably almost like comparing apples to oranges. but the loads should tell you which is worse... good luck...
RE: bending or shear?
i agree with nagi's message of march 16....look at the stress components (sx, sy, sz) on top and bottom surfaces of the shell elements.....if they are very similar in sign and magnitude, then membrane stress > bending stress. don't make the mistake of looking at the combined (or von mises) stress as that won't tell the story.
daveleo
RE: bending or shear?
I would probably just check a reference like Roarke and Young and see if there was a way I could empirically or semi-empirically make the determination.
--
Joseph K. Mooney
Director, Airframe Structures - FAA DER
Delta Engineering Corporation