Blast resistance and energy absorption of sandwich panels with layered gradient metallic foam cores
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The dynamic response, blast resistance and energy absorption capability of clamped square sandwich panels comparing two aluminum alloy face-sheets and a layered gradient metallic foam core, subjected to air-blast loading, were studied numerically in this paper. Graded sandwich specimens with six different core-layer arrangements and three different face-sheet thickness arrangements were examined, respectively, compared to those ungraded sandwich panels with an equivalent nominally mass. Simulation results show that the blast resistance and energy absorption capability of sandwich panels with layered gradient metallic foam cores could be improved by optimizing the arrangements of different density metallic foam core-layers, and the graded sandwich panel with low-middle-high density core configuration has the best blast resistance capability. The blast resistance of graded sandwich panels with different thickness arrangements for top and bottom face-sheets has no obvious change tendency, since the normal stress distributions of their sandwich cross sections are controlled simultaneously by face-sheets and gradient foam core.Keywords:
Aluminium foam sandwich
Sandwich panel
Sandwich panel
Aluminium foam sandwich
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The design of lightweight sandwich structures with high specific strength and energy absorption capability is valuable for weight sensitive applications. A novel all-metallic foam-filled Y-shape cored sandwich panel was designed and fabricated by using aluminum foam as filling material to prevent core member buckling. Experimental and numerical investigation of out-of-plane compressive loading was carried out on aluminum foam-filled Y-shape sandwich panels to study their compressive properties as well as on empty panels for comparison. The results show that due to aluminum foam filling, the specific structural stiffness, strength, and energy absorption of the Y-shape cored sandwich panel increased noticeably. For the foam-filled panel, aluminum foam can supply sufficient lateral support to the corrugated core and vertical leg of the Y-shaped core and causes a much more complicated deformation mode, which cannot occur in the empty panel. The complicated deformation mode leads to an obvious coupling effect, with the stress–strain curve of the foam-filled panel much higher than those of the empty panel and aluminum foam, which were tested separately. Metallic foam filling is an effective method to increase the specific strength and energy absorption of sandwich structures with lattice cores, making it competitive in load carrying and energy absorption applications.
Sandwich panel
Aluminium foam sandwich
Foam concrete
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The dynamic response of honeycomb sandwich panels under aluminum foam projectile impact was investigated. The different configurations of panels were tested, and deformation/failure modes were obtained. Corresponding numerical simulations were also presented to investigate the energy absorption and deformation mechanism of sandwich panels. Results showed that the deformation/failure modes of sandwich panels were sensitive to the impact velocity and density of aluminum foam. When the panel was impacted by the aluminum foam projectile with the back mass of nylon, the “accelerating impact” stage can be produced and may lead to further compression and damage of the sandwich structures.
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Honeycomb
Aluminium foam sandwich
Deformation mechanism
Honeycomb structure
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The blast-resistant performance of six types of sandwich panels were analyzed by using dynamic finite element method and compared in deforming,motion and energy absorption responses. It is founded that the sandwich structure consisting of aluminum panel,aluminum foam and high strength armor steel panel is much better than others under blast loading,and the density of the core of aluminum foam influences the dynamic responses of sandwich structure greatly. A dynamic finite element model for optimal design is established,and the thicknesses of metal panels and the aluminum foam core layer are optimized by using adaptive response surface method. The results show that the blast-resistant capability of aluminum foam sandwich structure increases remarkably.
Aluminium foam sandwich
Sandwich panel
Armour
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A new type of composite structure with a metal foam is reinforced by the metal corrugated core, called metal-foam-filled sandwich panel with a corrugated or V-frame core, is modelled, simulated, and studied in this article. All types of samples with different relative densities of the foam are tested and analyzed under the drop hammer load. The sandwich panel included two aluminium face-sheet, aluminium foams, and aluminium corrugated or V-frame cores. Mathematical and finite element models were also been developed to predict the effects of the relative density of the foam and other geometric parameters on the energy absorption. In addition, the mathematical equations based on a mass-spring-damper problem with two degree-of-freedom (DOF) were derived to evaluate the kinetic and kinematic parameters of the sandwich panel, such as velocity, acceleration, contact force, and energy absorption. It was found that the models could represent the dynamic response of the sandwich panel. Finally, in order to improve the performance of the sandwich panel, an optimization method was utilized for finding the optimum parameters which play an important role.
Sandwich panel
Hammer
Aluminium foam sandwich
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The dynamic response, blast resistance and energy absorption capability of clamped square sandwich panels comparing two aluminum alloy face-sheets and a layered gradient metallic foam core, subjected to air-blast loading, were studied numerically in this paper. Graded sandwich specimens with six different core-layer arrangements and three different face-sheet thickness arrangements were examined, respectively, compared to those ungraded sandwich panels with an equivalent nominally mass. Simulation results show that the blast resistance and energy absorption capability of sandwich panels with layered gradient metallic foam cores could be improved by optimizing the arrangements of different density metallic foam core-layers, and the graded sandwich panel with low-middle-high density core configuration has the best blast resistance capability. The blast resistance of graded sandwich panels with different thickness arrangements for top and bottom face-sheets has no obvious change tendency, since the normal stress distributions of their sandwich cross sections are controlled simultaneously by face-sheets and gradient foam core.
Aluminium foam sandwich
Sandwich panel
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Penetration (warfare)
Sandwich panel
Aluminium foam sandwich
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Aluminium foam sandwich
Penetration (warfare)
Sandwich panel
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The sandwich structures with aluminum foam core and metal surfaces have widespread use in the absorption of energy, because they are light weighted with high performance in dissipating energy. The cell structure of the foam core is subjected to plastic deformation in the constant compression level that absorbs a lot of kinetic energy before destruction of the structure. In this research, experimental tests of low-velocity impact on the sandwich structure by a drop machine are simulated by LS-DYNA software. Numerical results are obtained for different velocities and weights of projectile on samples of aluminum foam core sandwich panels with relative density (the ratio of the density of aluminum foam to the density of solid aluminum) of 18, 23, and 27. The results are compared with experimental results which reveal a good conformity. As well, from the numerical simulations, the effect of weight, velocity and energy of the projectile and the density of the foam core on the global deformation and energy loss rate of projectile have been studied.
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Hammer
Aluminium foam sandwich
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Abstract The impact resistance of protective structure directly affects the vitality of the ship. Since the excellent energy absorption characteristics and lightweight structural forms, foamed aluminum sandwich panels have gradually replaced stiffened panels and are widely used in local structures and components of vessels. In order to improve the protective ability of the ship structure, the impact resistance of the foam aluminum sandwich panel is studied in this paper. The deformation mechanism of the foam aluminum sandwich panel under the impact of the foam aluminum projectile is simulated by the finite element analysis, and the effect of different core thickness and core strength on the dynamic response of the sandwich panel is studied. An optimized structural form is proposed for the shear failure of foam aluminum sandwich panels. The results show that the optimized structure improves the impact resistance of foam aluminum sandwich panel and the shear resistance of the intermediate core layer. The research of this paper provides reference for the optimization of foam metal sandwich structure and its application in ship protection structure.
Aluminium foam sandwich
Sandwich panel
Impact resistance
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