These terms are for in plane load of a honeycomb panel. Assume that the facesheets take all the load.
T is the total thickness of the facesheets.
These terms are for the bending load of a honeycomb panel. Assume the facesheets take all the load. D is the thickness of the honeycomb core. These terms are for the shear load of a honeycomb panel. Assume that the honeycomb core takes all the load.