Sandwich structures are considered as optimal designs for a wide range of applications such as insulated structures, marine construction, transportation and aerospace vehicles.  A composite sandwich panel is usually made from a lightweight foam, honeycomb or corrugated core sandwiched between two composite facesheets. Such a combination offers exceptional specific strength-to-weight ratio or stiffness-to-weight ratio, buoyancy, dimensional stability, and thermal and acoustical insulation characteristics. In this paper, a new hybrid sandwich structure has been developed by combining most of the advantages of corrugated core including fibre metal laminates based on aluminium alloy and fibre reinforced composite, while avoiding some of their main disadvantages. Initial attention focus on identifying the optimum conditions for manufacturing the corrugated core and achieving a strong bond across the skin-core interface. Investigation was carried out to cover the mechanical behaviour of the corrugated sandwich structures over a wide range of strain rates. Both the low and high velocity impact tests of the sandwich structures were conducted to evaluate their energy-absorbing characteristics and to identify the associated failure mechanisms under extreme loading conditions. The results include the study of several panel configurations theoretically based on finite element analysis by using commercial finite element code Abaqus to develop all numerical models and experimental results in the most representative cases of the study.