Quasi-static Shear And Compression Tests On Sandwich Panel Of Aluminum Honeycomb

Honeycomb material is one of research achievements in human bionics. Since the continuous multi-wall arrangement of the honeycomb and hexagonal network structure, distracts the external force from all directions, the compressive resistance of honeycomb structure is much stronger than other shapes. Thus aluminum honeycomb sandwich panel with aluminum honeycomb core has been developed. Sandwich panel with aluminum honeycomb core has been identified as one of the potential candidate protective structures, because it has a powerful strength to weight ratio and absorb a lot of energy before compressed into a more stable condition. It is getting widely used in the field of aviation, aerospace, automotive manufacturing, packing, shipping, military, transportation and so on.However, it is common to see the phenomenon of de-bonding for the traditional aluminum honeycomb sandwich panel. Thus, A new kind of integrated composite structure has been proposed which is the integrated composite sandwich panel of aluminum honeycomb and epoxy resin. The upper and lower layers of the structure are aluminum honeycomb-epoxy resin composite layers, and the middle core is the aluminum honeycomb. This composite sandwich panel’s core and surface layers are connected into a whole without any obvious interface. The overall performance is greatly improved. The elastic stiffness, yield load, ultimate bending load, mechanism of deformation and energy absorption ability are studied through compression, four-point bending and indentation tests. The main work is as follows:Compression and four-point bending tests have been conducted with composite sandwich panel of aluminum foam and epoxy resin. Also, compared with the traditional aluminum honeycomb sandwich panels. The failure process, failure modes and failure mechanism are studied. Through compression load-displacement curves and four-point bending load-displacement curves, the influence of different parameters on yield load, energy absorption ability and ultimate bending load are researched. The results indicate that the energy absorption ability and ultimate bending load of the integrated composite sandwich panel have been greatly influenced by the immersing resin thickness, additional resin layer thickness and specimen thickness.The indentation mechanical properties of two kinds of sandwich panels are studied through quasi-statistic tests. The typical failure mode and load-displacement curves are studied through experiments. The influence of composite layer thickness, indenter type and boundary condition on ultimate load and energy absorption ability has been researched. The results demonstrate that the indentation bearing load and energy absorption ability has been significantly influenced by composite layer thickness, aperture and indenter type. Compared with traditional sandwich panel, the integrated composite sandwich panel of aluminum honeycomb and epoxy resin has perfect integrality, stability and energy absorption ability without de-bonding between composite layer and core.