I have experience in using SOL 400 nonlinear static analyses for composite structures. For the multi-step analysis, you define multiple steps each with their own loads, BC's, and a NLPARM card that defines the nonlinear convergence parameters. If you have a load or BC in one step and then remove...
I did a comparison of methods to apply loading (axial, shear, and moment) on a cylinder example for RBE2, RBE3, and the statically equivalent loading methods.
The statically equivalent loading method was the best overall in comparsion with beam theory results. The results show that the RBE3...
Sorry I haven't checked the threads in a while. I found a solution to determine the equivalent running loads (Nx, Nxtheta)on a cylinder from the beam loads and moments. The equivalent nodal forces around the circumference of the cylinder can be determined from the equivalent running loads. The...
You can also apply random imperfections to the nodes. You can write a program to generate random imperfections based on the thickness of the membrane and apply it to the nodes. Therefore, the results won't have any bias towards the applied imperfections from the mode shapes.
A better way would...
I am applying a shear load, axial load, and moment from a beam (stick) loads model at a specified station (location)to a more refined cylindrical shell model. I originally applied the axial load, shear load, and moment at a center node at the top of the cylinder by means of a NASTRAN RBE3 which...
How do I apply a shear load, V, and bending moment, M on a thin-walled cylindrical shell FEM to capture the correct bending stresses and shear stresses according to beam theory? According to beam theory, the bending stress is a function of sine, fb = M*Sin(theta)/(Pi*r^2*t) and the shear stress...
