thermal stress for multilayer structure
Hi, I would like two simulate the thermal stress a triple layer structure (triple layer pipe). In each structure the thermal and mechanical properties of the materials are different.
When I build the geometry, I have put all the solids in a single part.
I solve the thermal problem and the results look reasonable.
But when I try to solve the thermal stress problem, a large concentration of thermal stress exists in the interface between materials. I know it may due to the mismatch of thermal expansion coefficient. But even if there is a very small misdismatch, the thermal stress in the interface is large. I want to know if there is should be some setups in ANSYS workbench mechanical?
Then I put the same material in the each layer of the tube. And the thermal stress result is not the same as that in the single layer tube with the same total thickness and same material. Is this logical?
I have attached the project. In the geometry, I set steel to all the solid. Constant heat flux and constant temperture BCs are set for thermal problem. The constraint of displacement is put on the two end of the tube, which says that no displacement is allowed in the X and Y direction but movement in Z direction is allowable.
The weird thing is that the thermal stress in the center is quite small. Is the triple layer structure that has the same material in each layer not the same as a single layer structure?
My final goal is to simulate a steel-copper-steel structure.
Thank you for your time.