2 spar differential bending
2 spar differential bending
(OP)
Does anyone know a good reference for a simple method for calculating how shear and bending moment transfer between two spars as their moments of inertia change going inboard. I have the independent shear and bending on each spar as well as the balanced moments based on percentage of moment of inertia. Where I'm struggling is how the residual torque is calculated and how the transfer of shear/bending happens. In this case the spars are parallel and the leading edge has some sweep. So the height of the forward spar becomes smaller than the height of the aft spar going outboard.
Thanks.
Thanks.





RE: 2 spar differential bending
Quando Omni Flunkus Moritati
RE: 2 spar differential bending
Also, as rb1957 states, rib geometry/spacing/stiffness also comes into play. Your two-spar arrangement is a torque box. Review the sections in Bruhn about this construction. I guess my best advice is to do your detailed load path work first. Then your stress analysis will fall out naturally.
SuperStress
RE: 2 spar differential bending
Actually, that sounds like an interesting exercise. I might try to work up a spreadsheet in open office and see what the results look like.