Numerical Simulation On The Response Of Explosion Containment Vessels With Metallic Foam Core Sandwich Structure

As one of the most common tools for disposing explosive, explosion vessel plays an important role in the modern society. So the research of its dynamic response under inner blast is of great significance. The dynamic response of traditional cylindrical explosion vessel under inner explosion is simulated using3D dynamic finite element software ANSYS/LS-DYNA in this paper, while the influence of forms of sandwich structure whose core is aluminum foam is explored. The best arrangement of the core, with which the radial displacement in the middle of the explosion vessel is the smallest, is obtained.Above all, the response of conventional cylindrical explosion vessel to inner blast is simulated. And the validation of ALE algorithm used is confirmed by comparing the simulating data to the experiment data and the theoretical data. In additional, by comparing the dynamic response of explosion containment vessels with flat end and explosion containment with ellipsoid end, the influence of forms of head is explored. The result indicates that although the response in the middle of the containment vessels has little to do with the end forms, the maximum Mises stress of explosion containment vessels with flat end would appear in the connection of the cylindrical shell and the flat end plate while the maximum Mises stress of explosion containment vessels with ellipsoid end would appear in the vertex of the ellipsoid head.Secondly, the influence of conventional sandwich structure to the conventional cylindrical explosion vessel is researched in this paper. The protection effect is compared by simulating response of the cylindrical container to inner blast under three different ways of using aluminum foam. By changing simulating parameters, the influence of core density, face panel thickness and explosive shape is explored, which would provide reference value for conventional explosion vessel protecting. The result indicates that adding sandwich structure, which is good in energy-absorbing and lightweight, between conventional explosive container and the explosive contributes to dissipating impacting energy while provide support for the vessels to work safely by reducing stress level of it; Meanwhile, thicker face panel or larger core density would provide more effective protection to the cylindrical container.Finally, graded aluminum foam is used to protect the cylindrical container. With ANSYS/LS-DYNA the dynamic response of two anti-explosion containers with double-layer graded aluminum foam core sandwich structure and that of six anti-explosion containers with three-layer graded aluminum foam core sandwich structure are simulated. By comparing the process of deformation and energy absorbing the effect of each layer is analyzed while the performance of sandwich structure is optimized. The result indicated that:arranging aluminum foam with large relative density as inner core contribute to absorbing energy in short time while arranging aluminum foam with small relative density as outer core contributes to reducing the stress wave transmitted from the inner core, so that the cylindrical container is protected more effectively. In other words, we can reduce the mass of explosion vessel effectively with the required working equivalent unchanged.