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This study deals with experimental and numerical response of trapezoidal corrugated core sandwich panels made of ST37 subjected to oblique blast loading. Sandwich target plate is 270*270 mm that consist of front/ back plate with 1 mm and trapezoidal corrugated core with 0.7mm thickness. The experimental explosive was done at the end of four different blast tube with angle of 0°, 15°, 30° and 45°respect to sandwich target plate. The mass of explosive (C4) was 10g and the stand-off distance was constant at 300 mm. The results of numerical simulation, obtained using coupled Eulerian–Lagrangian (CEL) model at commercial ABAQUS/Explicit software. The results show good agreement between the numerical and the experimental values. The results show that with increasing angle of tilt from 0° up to 45°, the maximum displacement decreases. At the higher masses of explosive, this reduction in deformation will be greater than the lower masses of explosive. Also, due to directing a large part of the blast wave to out of the blast tube, the amount of plastic dissipation energy at the angle of 45 degrees is significantly reduced compared to other angles.

The behavior of different structures subjected to blast loads is always an important factor to study. Sandwich panels have a wide range of applications in different fields of engineering and the construction of some industrial and military structures. These panels are made of two sheets and an intermediate core. The core has a significant role in reducing the deflection and enhancing energy absorb of structure. In this article, the effect of the shape of the corrugated panel and the type of panel materials is investigated. Hence, the reaction of aluminum and steel sandwich panels subjected to blast loads has been investigated. In the process of analysis, four kinds of profiles, which are: rectangular, trapezoidal, triangular and elliptical, are considered as panel cores. the most deflection was for rectangular profiles and the least deflection was for triangular ones. Those panels which are completely made of aluminum or the panels with steel cores can sustain more strain energy by their back sheets. all the panels that are completely made of aluminum have more damped energy than others. Those panels which have only aluminum sheets or aluminum cores are placed next to whole aluminum panels in order to damped energy level. In the study of the joint effect of the type of materials and the shape of the core panel, the panel with the upper and back of the steel and aluminum core with the triangular shape has the most desirable.

An Experimental and numerical study on the flexural behavior of new types of sandwich structures with glass-epoxy skins and a combinatorial core consisting of PVC foam and a corrugated composite was performed. The purpose of inserting a corrugated composite into the core was the reinforcement of the core and so of the sandwich structure without substantial increment in its weight. Samples were prepared by vacuum assisted resin transform molding industrial technique and tested using three-point bending load test according to ASTM C393 and then the load-deflection curves were obtained. The finite element analysis was performed using Abaqus software to determine the maximum deflection of the samples. In order to increase the precision of numerical results, the tensile test was carried out according to ASTM D3039 to obtain the mechanical properties of the skins and corrugated composite. In addition to a reference sample consisting of a simple foam core, three series of samples were prepared, which consisted of corrugated composites, with square, trapezoidal and triangular geometries, inserted in a PVC foam core. For each experiment, three samples were prepared and tested and the data were used as mean values. It was revealed that the highest and lowest increases in flexural stiffness and flexural stiffness-to-weight ratio were obtained for the samples with trapezoidal and triangular geometries, respectively. Finally, the experimental and numerical results were compared and a good agreement was observed in all samples.