Ansys Learning Forum Forums Discuss Simulation General Mechanical Honeycomb Shear modulus Calculation based on Analysis – ASTM 273 Reply To: Honeycomb Shear modulus Calculation based on Analysis – ASTM 273

peteroznewman
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Hexcel provides the shear properties in their datasheet that were measured on their product so structural analysts can use them to build simulations of that honeycomb core in structural models that have a honeycomb core sandwich panel.

Most analysts will take the three modulus values in the three directions and create an orthotropic material model that can be applied to a solid body that represents the core. That solid body can be meshed with solid elements.  To turn that into a structural sandwich panel, facesheets are required. If these are aluminum facesheets, these could be modeled as shell elements on a surface that is on the top and bottom faces of the solid core, or the facesheets can be modeled using solid elements meshed on a thin solid that is on the top and bottom faces of the solid core. In either case, Shared Topology is used to connect the facesheets to the core.

I see you are trying to simulate the shear test of the product.  One source of error between your model and the physical test is the adhesive that bonds the core to the facesheet or test plates. This adhesive has some thickness and during bonding, the edges of the walls sink into that thickness and the adhesive climbs up the walls creating a fillet and shortening the effective dimension of the thickness of the core. This will result in a higher modulus than your model which does not include the support of the adhesive.