A NUMERICAL ANALYSIS OF THE EFFECT OF MESH SENSITIVITY ON BALLISTIC LIMIT PREDICTION

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Authors
  1. Nandlall, D.
  2. Wong, G.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
This memorandum presents a study to examine the effect of the mesh density on the ballistic limit determination of a 1.08-cm thick 6061-T6 aluminium plate struck by a 5.56-mm SS109 bullet. The ballistic limits of the target plate were obtained for three different mesh densities. The results showed that an optimised finite element mesh in the impact region would yield consistent penetration results. It was also shown that as the number of elements is increased, the CPU run time increases significantly but with little gain in the accuracy of the ballistic limit. On the other hand, if the number of elements is decreased below the optimised mesh density, the CPU time could increase significantly and errors in the accuracy of the predicted ballistic limit could be large due to hourglassing and severe mesh distortion.
Keywords
High Velocity Impact;Numerical simulation;Hydrocode simulation
Report Number
DREV-TM-9831 — Technical Memorandum
Date of publication
01 Dec 1998
Number of Pages
23
DSTKIM No
99-00060
CANDIS No
509812
Format(s):
Hardcopy;Document Image stored on Optical Disk

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