Hi Have for a period been searching for tutorials of how to build a composite (and doing an analysis, eigenvalue, Euler-buckling, first ply) model in Ansys.Have been able to find a couple of examples in the Ansys-portal examples search, have after reviewing the different options decided that shell91 will be a appropriate element type for me. (because of nonlinear capabilities)Referring to "152191 - Example of new Failure criteria (FC) method for shell91 vs. old method", shows the basics of how to build a composite specimen of 5 layers, and using new and old FC (Tsai-Wu).

I have designed a large boat trailer structure and FEA analyzed it statically.



Now, i want to know if it's possible in CATIA to compute the needed pulling force/power that the trailer will need to start moving. I assume a load of 200ton on the trailer frame and some frictional data must be entered to the wheels/ground contact surface. Anyone has ever done something similar before?

I am using Abaqus to  calculate the critical loading for a 3D buckling beam with both ends pinned. However, the resutls are extreamly large and do not make sense. I try to calculate the 2D case and it matches with theoretical solutions very well. So I doubt that the eigenvalues in a 3D case has some meaning other than the critical loading. 

For a 2D beam buckling problem, the eigenvalues are the critical loading. What do the eigenvalues for a 3D buckling beam mean? Thank you!

Dear all,

I am writing a program for crystal plasticity using VUMAT. I met some problems, hope you guys can help me out.

Assume each node represents a single crystal. At each step, VUMAT will give strain increment which is based on curent configuration(right?)

Then I can calculate the shear strain in each slip system and obtain the plastic deformation gradient. So I can get the elastic deformation gradient for current step. Using polar decomposition, rigid body rotation matrix can be obtained.