Questions about composites modelling

Hello,

 

I am currently working on a project where I have to optimize the monocoque structure of a lightweight vehicle. The materials used are carbon fiber reinforced polymer and aramid fort the core. In some places, there have to be inserts so that for example the belt or the seating can be fixed. The goal of my task is to make a composite optimisation with Hypermesh/Optistruct for the monocoque and particularly the insert zones.

 

On the picture  below you can see the structure of the insert zone. First there is a sandwich-structure with layers of CFRP (A and C) and aramid (B), which forms the monocoque structure. Then I have the insert (E) which is glued on the top of the CFRP-layers (C). Another CFRP-Layers (D) are laminated on the top of the insert zone, except the threaded rod of the insert.

 

I have some difficulties to simulate this structure on Hypermesh. Insofar as I have several layers (C) of CFRP between the aramid and the insert, the insert is merged in the CFRP layers (in the 2D detailled element representation). I want to have the insert (E) on the top of the last CFRP layer. Do I have to create a contact between the last CFRP layer and the insert?

On the picture below you can see my problem (the D-Layers are not shown in this view).

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I have the same problem to put the CFRP layers (D) on the layers (E) at the places where there is no insert (around the insert).

 

Thank you for any help,

Eric