Hi everyone, I am doing the research about how to model the seam weld that correctly reflects the structure’s dynamic characteristics. In NX Nastran's quick reference I found a CSEAM element to define a seam line. But this element seems that it can only be built between to surfaces. Does anyone know how to use it to model the seam line in a Tee joint? And what is the advantage of this element than directly using rigid element RBE2?
The CSEAM element entry do not exist in the NX NASTRAN ELEMENT LIBRARY.
In NX NASTRAN we have the CWELD element that let you establish connections between points, elements, patches, or any of their combinations. Although there are a number of different ways to model structural connections and fasteners in NX Nastran, such as with CBUSH or CBAR elements or RBE2s, CWELDS are generally easy to generate, less error-prone, and always satisfy the condition of rigid body invariance.
To model seam welds you can use either rigid RBE2 elements or shell elements. In the case of plate elements the weld is typically not modelled and the finite elements are arranged in the middle of the individual plates. Only if the weld has eccentric weld arrangements is the weld modelled.
Thanks for your reply. I see that there are two ways of modelling a lap joint. What I want to know is do they provide similar results? How could I judge which one to use?