High Strain Rate Evaluation of Armor Materials


  1. Bassim, M.N.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);Manitoba Univ, Winnipeg Man (CAN) Dept of Mechanical and Manufacturing Engineering
This report gives results of investigations on high strain rate behaviour of materials with potential for use in armour plates. They include RHA steel plate, Tungsten A90S and Aluminium 5083 H131 alloys. Also considered were ceramics TiB-TiC, SiC-B and Alumina 98. The testing took place at strain rates in excess of 103 s-1 using both direct impact Hopkinson Pressure Bar (HPB) and Torsional Split Hopkinson Bar (TSHB). Both equipments were fully instrumented for retrieval of the incident, transmitted and reflected waves and for obtaining stress-strain curves. The testing results on the metallic materials produced stress-strain curves which are suitable for design at high strain rates. The ceramic materials proved to be too hard to machine. An alternative was to test Alumina 96 in torsion at high strain rates. The results from these tests are also included. Following testing, specimens were examined to determine the microstructural evolution during impact. In most cases, development of adiabatic shear bands, both of the deformed and transformed type were observed and reported. Crack initiation within these bands was also observed leading to fracture of specimen. Together with the described research, a part of the contract involved constructing a torsional Split Hopkinson Bar for delivery to Defence Research and Development Canada Valcartier (DRDC V). This equipment was delivered on schedule in December 2006.

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Report Number
DRDC-VALCARTIER-CR-2007-266 — Contractor Report
Date of publication
01 Dec 2007
Number of Pages
Electronic Document(PDF)

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