Experimental Characterization and Modeling of the 2024-T3 Aluminum Alloy Under Close-in Blast Loading
Thin 2024-T3 aluminum alloy panels were subjected to close-in blast loading. Panels of various thicknesses were tested against different blast loadings and approach distances. A finite elemental close-in blast simulation model (LSDYNA ALE method) was firs
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Experimental Characterization and Modeling of the 2024-T3 Aluminum Alloy Under Close-in Blast Loading Jian Yu, Chian-Fong Yen, Charles Chih-Tsai Chen, and Mark Nansteel
Abstract Thin 2024-T3 aluminum alloy panels were subjected to close-in blast loading. Panels of various thicknesses were tested against different blast loadings and approach distances. A finite elemental close-in blast simulation model (LSDYNA ALE method) was first calibrated with the experimental data, and then it was used to predict damage behaviors at different blast loadings and approach distances. Simulation results were comparable to the experimental data. Keywords Aluminum alloys • Blast simulation
45.1
Introduction
Aluminum alloys are the prime metallic materials used for light weight industrial applications. Experimental characterization of the damage in AA 2024 T3 alloy subjected to close-in blast loading is one of the critical steps to assess and improve the safety of passenger and cargo transportations. To evaluate the survivability of thin structures, shock-hole blasts on Aluminum Alloy 2024-T3 panels were tested at different explosive loadings and approach distances. The tests established the critical approach distance, the minimum distance at which the blast would breach the panel, as a function of the explosive loading. Finite element simulations of the shock-hole tests were carried out using Johnson–Cook (J-C) material models, which include strain and strain rate hardening, thermal softening effects and failure. LS-DYNA ALE method was used to implement the near-field blast simulation. The spall strength parameter of the JC model was calibrated with one set of experimental data at one particular explosive loading. The calibrated J-C model was able to predict failure behaviors at other explosive loadings and approach distances. Numerical predictions were comparable to the experimental observations.
45.2
Airblast Shock-Hole Blast Testing
A series of close-in shock-hole blast tests were conducted to characterize the critical breach behavior of 2024-T3 aluminum alloy panels at different explosive loadings and approach distances. Each panel was subjected to a selected size of charge of C4 explosive. Two thicknesses were tested, 0.10 cm and 0.18 cm, respectively. The panel was bolted along its square edges into a test fixture with a circular opening for the testing. The fixture was considered rigid for the current analysis study. J. Yu (*) • C.-F. Yen U.S. Army Research Laboratory, 4600 Deer Creek Loop, Building 4600, RDRL-WMM-B, Aberdeen Proving Ground, MD 21005, USA e-mail: [email protected] C.C.-T. Chen U.S. Department of Homeland Security, Transportation Security Laboratory, TSL-100, Building 315, Atlantic City International Airport, NJ 08405, USA M. Nansteel Battelle Memorial Institute, Transportation Security Laboratory, William J. Hughes Technical Center, Atlantic City International Airport, NJ 08405, USA V. Chalivendra et al. (eds.), Dynamic Behavior of Materials, Volume 1: Proceedings of the 2012 Annual Conference on E
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