Mechanical behavior of metallic sandwich panels under blast action

An energy balance based analytical method and finite element simulations were developed in this paper to study the dynamic response of metallic sandwich panels subject to blast loading. Based on the continuous deformation of sandwich panels under blast loading, its deformation process was divided into four main stages: bending and shearing deformation, elastic tensile deformation, plastic tensile deformation and tensile fracture. The formula of sandwich panel deformation process was also obtained by the theoretical derivation. The delimitation loading in the deformation process was also given, which includes tensile, yielding and cracking delimitation blast loadings. Moreover, parametric studies were then carried out to assess various factors that are influential in characterizing dynamic behavior of sandwich panels subject blast loads, and the deformation equation was verified through finite element modeling. It shows that, the deformation is increased with the blast loading, while decreased with the increase of thickness of face sheet and foam core, strength of core span of panel. The shear modulus of core has little effect on the deformation of panel.