Hello,
I am a new Abaqus user trying to model a pressure vessel made by three different layers through its thickness. The first layer, in contact with the cryogenic fuel, is homogeneus aluminum, the second layer is made by homogeneus polyurethane foam, while the outer-most layer is made by CFRP.
While the middle layer is modeled with 3D solid elements since it has a considerable thickness, the inner and outer layers are modeled with conventional shells.
Interaction between the three layers is given by Tie.
In particular a homogeneus shell section is assigned to the inner aluminum layer, while a composite shell section, made by 8 plies with different orientations, is assigned to the outer-most layer.
When I try to run the coupled temperature-displacement analysis with such configuration I get the warning: "A different number of temperature degrees of freedom are used in two different shell sections. The temperature field may not be continuous if the elements included in these sections share nodes. For compatibility *mpc or *equation option is needed." and too many attempts made for the increment.
No apparent changes are noted acting on the two shell sections number of integration points.
Just for curiosity I've tried to see what happens when I assign the same section to the two shells: both for homogeneus or composite sections no problems arise.
Do you have any ideas/suggestions on how to act in such case?
Thank you
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