Optimization of a Numerical Simulation Involving the Impact of an AP-T C44 12.7mm Projectile on a Semi-Infinite Monolithic 6061- T6 Aluminium Target

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Authors
  1. Kaufmann, C.
  2. Williams, K.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);Waterloo Univ, Waterloo ONT (CAN) Dept of Mechanical Engineering
Abstract
This memorandum details the creation of a numerical model to simulate the ballistic impact of an AP-T C44 12.7 mm round on a 152.4 mm diameter, 152.4 mm long cylindrical 6061-T6 aluminium target. Mesh sensitivity studies that examined the depth of penetration of the projectile for various mesh configurations were conducted. It was found that an optimum mesh density existed such that it would give results that were not significantly different from numerical simulations with higher density meshes. However, the numerical simulations with the optimum mesh density ran at greatly improved run times compared with the higher density meshes. On the contrary, if the mesh size became too coarse, the accuracy of the simulations suffered. A parameter study involving the erosion strain of the aluminium target was then conducted using the optimized mesh. Upon examining several values for erosion strain at various velocities, it was determined that a failure strain of 1.2 for the aluminium target yielded results that were the closest to the experimentally obtained values. The numerical model created as a result of this study will provide a foundation for ongoing numerical research into hybrid body armour systems for protection from high velocity large calibre small arms projectiles.

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Keywords
Numerical Simulation;Finite Element;Hydrocode Simulation;LS-DYNA;Body Armour;Depth of Penetration;Ballistic Impact;Mesh Sensitivity
Report Number
DRDC-VALCARTIER-TM-2002-015 — Technical Memorandum
Date of publication
01 May 2004
Number of Pages
34
DSTKIM No
CA024262
CANDIS No
521798
Format(s):
CD ROM

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