Stresses in beam models
Stresses in beam models
(OP)
i made a beam model, calculated and now i have problem. in old program which i used, as results i could get normal stresses, shear stresses and von Misses.
sigma_Misses=sqrt(sigma_normal+3*sigma_shear^2)
in Femap i can obtain only normal stresses and "combined stresses" which i don't even know what they are.
is it possible to get shear and von Misses stresses in Femap?
sigma_Misses=sqrt(sigma_normal+3*sigma_shear^2)
in Femap i can obtain only normal stresses and "combined stresses" which i don't even know what they are.
is it possible to get shear and von Misses stresses in Femap?





RE: Stresses in beam models
An observation i would make is that peak bending stresses don't coincide with peak shear stresses, so combining them (as i read your post) is conservative.
RE: Stresses in beam models
The results varies with what solver you are using. Exactly what you get and now it is computed you can probably find in the manual.
One way to figure it out if the manual isn't there is to start with a simple axial force. What resulöts will that produce. Then you use pure shear and so on ....
Good Luck
Thomas
RE: Stresses in beam models
NX Nastran computes the bending moments End-A & End-B at plane1 & plane2, shear forces (in both plane1 & plane2), axial force and torque, but do not compute torsional stress neither shear stress.
Since there's no torsional stress recovery for the CBEAM element, the margin-of-safety computation does not include the torsional stress. If the torsional stress is important in your stress analysis, use the torsional force output to compute the stress outside of NX Nastran. The torsional stress is highly dependent on the geometry of the CBAR's cross section, which NX Nastran doesn't know.
In summary, with NX Nastran only the longitudinal stresses ara available as complex stresses; hence, any stress due to torsional or warping is not included, is up the user to check that values.
Best regards,
Blas.
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Blas Molero Hidalgo
Ingeniero Industrial
Director
IBERISA
48011 BILBAO (SPAIN)
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