Modeling 2 cell wing box under vertical shear loading [FEMAP] help
Modeling 2 cell wing box under vertical shear loading [FEMAP] help
(OP)
Hello all,
I have a two cell wing box cell structure that has been idealized as concentrated areas for the flanges and stiffeners. The spar flanges and stiffeners are assumed to carry only axial loads and the skin and spar webs are assumed to take only the shear loads. My question is how would I model this in FEMAP to validate my numbers that I crunch out from the analytical solution. Currently I've modeled the problem in FEMAP using CSHEAR elements and CROD elements. The CROD elements are the for the concentrated areas and CSHEAR element for webs and flanges. The current configuration is each cell is 10 by 10 inches. I gave the model a depth of 20 inches. I have loaded the model at one of the concentrated areas (i.e CROD element nodes). I have attached the FEMAP model if anything is wondering of the configuration.
My question is whether I am modeling it the right way. I am unable to get the model to run with this configuration.
I have a two cell wing box cell structure that has been idealized as concentrated areas for the flanges and stiffeners. The spar flanges and stiffeners are assumed to carry only axial loads and the skin and spar webs are assumed to take only the shear loads. My question is how would I model this in FEMAP to validate my numbers that I crunch out from the analytical solution. Currently I've modeled the problem in FEMAP using CSHEAR elements and CROD elements. The CROD elements are the for the concentrated areas and CSHEAR element for webs and flanges. The current configuration is each cell is 10 by 10 inches. I gave the model a depth of 20 inches. I have loaded the model at one of the concentrated areas (i.e CROD element nodes). I have attached the FEMAP model if anything is wondering of the configuration.
My question is whether I am modeling it the right way. I am unable to get the model to run with this configuration.





RE: Modeling 2 cell wing box under vertical shear loading [FEMAP] help
i think CSHEARs need rods all around (ie each side) ... you may be better off with CQUAD and use the material properties to trick them into be shear effective only.
personally i'd also use CBEAMs inplace of the CRODs ... you can use small bending properties to reduce their bending stiffness. with CRODs, what is providing out-of-plane stiffness away from your spar and rib webs ?
another thought, why have so many elements between ribs and spars ? is there a distributed load input (like pressure) ? probably not as CSHEARs don't like pressure.
another day in paradise, or is paradise one day closer ?
RE: Modeling 2 cell wing box under vertical shear loading [FEMAP] help
Thanks for the reply btw. New to this forum.
RE: Modeling 2 cell wing box under vertical shear loading [FEMAP] help
another day in paradise, or is paradise one day closer ?