Preliminary study of ballistic impact on an industrial tank: Projectile velocity decay
ABSTRACT Since the events of September 11, 2001, the possibility of an intentional act targeting the chemical process industry has become realistic. It is, therefore, a great concern to be able to predict the immediate consequences of such an act. This study is intended to improve our knowledge about the sequence of events that occurs when a high-speed bullet (>1000 m s−1) penetrates a vessel filled with toxic liquid. We find that, prior to liquid ejection, several well-defined phases occur, including the phenomenon known as the “hydraulic ram.” This paper focuses on projectile–target interactions and explains how the decay of projectile velocity is related to the initial conditions of the target.
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ABSTRACT: The main function of a multi-layer protective structure of a combatant ship is to prevent the inner cabins from being destroyed by anti-ship weapons. The damage effect of these weapons on ship structures mainly comes from the blast wave and fragments. The motivation of this study was to investigate the synergistic effect of blast wave and fragment impact loadings on the multi-layer protective structure. A protective structure model with four layers and a metal casing filled with TNT charge (MCTC) which was used to simulate the warhead of an anti-ship weapon were designed and manufactured. An experiment was conducted in which the MCTC exploded inside an empty cabin of the first layer of the multi-layer protective structure. The distribution of fragments and the equivalent bare charge of the MCTC were determined by a numerical method. From experimental results, the failure pattern of the multi-layer protective structure under the synergistic effect of blast wave and fragment impact loadings was presented. The synergistic effect for the stiffened plates was also presented in the experiment by comparing the deformation and the rupture of the air-backed and water-backed stiffened plates. On the other hand, the agreement between numerical results and experimental results validated the numerical method, which enabled the numerical model to be used to predict the response of a full scale structure under loadings of anti-ship weapons. Finally, a discussion of synergistic effects of blast and fragment loadings on a multi-layer structure was presented and suggestions for the design of a protective structure are put forward.International Journal of Impact Engineering 01/2013; 65. DOI:10.1016/j.ijimpeng.2013.11.009 · 2.01 Impact Factor
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ABSTRACT: Hydrodynamic ram (H RAM) is a phenomenon that occurs when a high-energetic object penetrates a fluid-filled container. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure, increasing the risk of catastrophic failure and excessive structural damage on adjacent components. It is of particular concern in the design of wing fuel tanks for aircraft because it has been identified as one of the important factors in aircraft vulnerability. To study the aforementioned phenomenon, water-filled aluminum tubes (to different volume percentages) were subjected to impact of spherical projectiles. This work is focused on the analysis of energies, momenta, and pressure contours obtained by means of a previously developed and validated numerical model to achieve a better understanding of the fluid/structure interaction problem that takes place during the HRAM phenomenon.AIAA Journal 07/2012; 50(7):1621-1630. DOI:10.2514/1.J051613 · 1.17 Impact Factor
Article: Hull SlammingApplied Mechanics Reviews 01/2011; 64(6):1003-. DOI:10.1115/1.4023571 · 2.67 Impact Factor