Abstract:
In order to study the impact of aluminum foam energy-absorbing layer on the concrete blast wall, using LS-dyna to simulate the dynamic response of the composite explosion-proof wall containing foam aluminum energy-absorbing layer, analyze the effects of the structural parameters of the aluminum foam sandwich panel, the relative density of the aluminum foam, and the intensity of the explosive load on the compressive and deformation pattern and blast resistance. The study results indicate that: composite blast wall in the explosion load, mainly through the sandwich panel front panel local bending deformation, core layer plastic collapse deformation to absorb blast wave energy. Composite blast wall blast performance and core layer thickness is positively correlated with the panel thickness is negatively correlated, but the panel is too thin due to insufficient strength load enhancement phenomenon. With the increase in the relative density of aluminum foam, explosion-proof wall of the first significant increase in anti-explosive properties tend to level off, and continue to increase the relative density will lead to a decrease in the gradient of wave impedance, weakening the attenuation effect. 7.5 kg TNT charge, burst distance of 50 cm explosive loading conditions, take the core layer thickness of 6 cm, the panel thickness of 0.5 cm, the relative density of aluminum foam 44% to give full play to the material's energy-absorbing properties, at this time, the core layer of the compression ratio of 73.3%, the composite explosion-proof wall of the anti-explosive properties to enhance 77.5%. With the enhancement of the blast load, the composite blast wall clipping coefficient tends to increase and then decrease. The study can provide a reference for the application of aluminum foam in blast protection.
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