• material model
• honeycomb core panel
• buckling
• additive manufacturing

Additive Manufacturing (AM) is becoming, especially in the last years, a field of major interest, both for research and for industry. The purpose of this thesis work is to understand the AM process starting from powders in a support mean, usually a gel (in this case powders were of a material similar to polypropylene) and then illustrate the buckling behaviour of a honeycomb core panel produced with this technique (with particular focus to the definition of a model which can be used in general, also with different base materials).Starting from the properties of base material (powder), the behaviour of the material deposed by AM was studied, with an initial hypothesis of material isotropy, later confirmed with the calculation of elastic properties. Afterwards, since the base material is similar to polypropylene, it was defined an elastic-plastic law to describe the non-linear behaviour of the material, based on data given by the producer and on similar curves found in literature.Those assumptions were verified with traction tests on specimens produced by AM, and therefore the model was validated. With the same microstructural model the compression behaviour of the material was estimated using a curve comparable to the traction one (with estimated values of base material properties derived from compression and bending data given by the producer): this material model was used for the buckling study of a honeycomb core panel in transverse compression.