Characterization of the Dynamic Behaviour of ALGOTUF Armour Steel during Impact and In Torsion

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Authors
  1. Bassim, N.
  2. Boakye-Yiadom, S.
  3. Toussaint, G.
  4. Bolduc, M.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Manitoba Univ, Winnipeg MAN (CAN) Dept of Mechanical Engineering
Abstract
Algotuf is a new steel which is proposed as a candidate for armour material. To assess this application, a study of the impact properties of this steel was conducted at the University of Manitoba using two types of Hopkinson Bar systems, namely a torsional bar equipment and a direct impact system capable of producing high strain rates and large strains. Stress strain curves for the steels were obtained in pure shear and in compression. Temperatures of 25ºC, 200ºC and 500ºC were used in the testing. Following the testing, a microstructural examination of the specimens tested was carried out to investigate the effect of microstructure on the mechanism of failure of this material. It was found that, above a value of impact momentum corresponding to a high strain rate, adiabatic shear bands are formed. The microscopic examination showed that the initiation of these shear bands corresponded at locations where martensitic laths were present and around regions of maximum shear stresses. Generally, the shear bands act as precursors to the formation of microcracks that may lead to failure. On the other hand, the high strength and formability of the steel makes it suitable for use as an armour material.
Keywords
high strain rate;steel armour
Report Number
DRDC-RDDC-2015-N094 — External Literature
Date of publication
30 Nov 2015
Number of Pages
6
DSTKIM No
CA041553
CANDIS No
802748
Format(s):
Electronic Document(PDF)

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