If I create a beam in Simulation with the cross section of an angle "L" with the length of the beam along the X axis, pin both ends (immoveable), & apply a load in the Y direction at the center of the beam the resulting deformation is out of plane. Instead of just up & down in the Y direction it also bows out into the Z direction. I am using structural angle cross sections.
If I create shear & moment diagrams they match hand calcs--ie shear in the "direction 1" & moment in the "direction 2." When I look at a bending stress diagram it does not match hand calcs--even if I limit the stress plot to bending in direction 2 only. As I said--the moment in direction in 2 is correct--so should I not be able to take that moment & divide it by "S" of my structural angle cross section (bending stress = M/S) & get the bending stress? Doing this does not match the stress plot in direction 2.
I can do this with channels, square & rectangle tubes & dividing the given moment by "S" does match the Simulation bending stress in direction 2---Why does this not work if the cross section is an angle shape?