24 August 2018
- Last edited 24 August 2018
If you purchase honeycomb core from a manufacturer, they have done the experimental work to measure the shear modulus of the core in two directions: the ribbon direction (L) and transverse to the ribbon (W). They also measure the compressive modulus in the 20 mm thickness (T) direction. You can see those values in the table in the first post in this discussion.
Once you have those three modulus values, and also the strength values in those three directions, you are ready to use that data in an orthotropic material model. That means you create a solid model, 20 mm thick, and assign the orthotropic material to that solid. You have to make sure a coordinate system has its X, Y, Z directions pointing in directions that correspond to the thickness, ribbon and transverse directions of the modulus values entered in Engineering Data.
Now you also have to share topology with some facesheets that might have it's own orthotropic material constants if it is a composite layup, or it could be an isotropic material if it is aluminum facesheet.
It sounds like you have actual honeycomb foil geometry, like is shown in the image above. Does it have double thickness of foil as shown in that image? When core material is tested to obtain the shear modulus, it is bonded to 20 mm thick face plates. That is because the only flexing that is supposed to occur is in the core. Here is the test apparatus from ASTM C273 -11 Standard Test Method for Shear Properties of Sandwich Core Material.
If you want to simulate the experimental measurement of core shear modulus, you can simply make one face of the core (all the honeycomb edges) be a fixed support and the other face of the core (all the edges) have a remote force, with a Rigid behavior, to pull the core sideways.
Shell elements and beam elements can conduct and convect heat just as well as solid elements, so don't rule shell models out just because you want to do a thermal model.
As I said, I'm not an ACP user, so someone else can comment on that. I will say that I have made models that use carbon fiber sheets. I have them measured to obtain the orthotropic properties so my models flex the way the real part will flex, but I am not interested in interlaminar stresses.