I want to analyse a multi-layered composite shell using Nastran or Ansys. If each material is same thing, Nastran and Ansys are considered in this situation as the attached one. In order to get an accurate result, I should input "joint element" between each layer. The problem is, I don't know anything about joint elements.
SHELL281 may be used for layered applications for modeling composite shells or sandwich construction were there is no need to use gluing/bolting techniques. If you are using the same and still looking for the joint elements then you can use combin 7 elemet in ANSYS as a joint element for simulation b/w multi layered element.
you can also refer to ansys help for more information on element and application
If your mesh is coupled by displacement continuity (common nodes at layer interfaces), you can change the material assigned to each layer without loosing coupling. There is a difference between mesh topology and the constitutive law assigned to each element.
I suppose this is what you have since you say that it works well with a material.
Now if you have physically disjoint layers (no common nodes at interface), you have to define a coupling, either by a constraint or by adding springs. If your layers are glued in practice, you should use rigid multiple points constraint to enforce no relative displacement of your layers at the interfaces.
As Siva suggested you also have multi-layer shell elements available in most commercial that may suit your simulation needs.
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