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The dynamic indentation behavior of steel at large depths of penetration

Published online by Cambridge University Press:  31 January 2011

G. Sundararajan  and
S.N. Dikshit
G. Sundararajan*
Affiliation:
International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
S.N. Dikshit
Affiliation:
International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
*
a) Address all correspondence to this author. e-mail: [email protected]This author was an editor of this focus issue during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy
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Abstract

The objective of the present study is to investigate the dynamic indentation behavior of steel plate material when impacted by ogive-shaped projectiles and in particular under indentation conditions involving large depths of penetration (i.e., depth of penetration greater than projectile radius). Toward the above purpose, dynamic indentation of steel plates of thickness 20, 40, and 80 mm have been carried out using projectiles of diameter 6.2 and 20 mm, and over a range of impact velocities so as to attain depths of penetration in the range 1.4 to 3.6 times the projectile radius. The results indicate that the dynamic hardness, the plastic zone size, specific energy consumed in plastic deformation within the plastic zone, and the average plastic strain within the plastic zone increases continuously with increasing values of depth of penetration normalized by projectile radius. Certain subtle differences regarding the nature of plastic deformation between indentation at large and shallow depths of penetration are presented. However, on a macroscopic scale, the indentation mechanisms and processes are broadly similar and show continuity in terms of behavior across the whole penetration depth range.

Keywords

HardnessMetalStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 691 - 703
Copyright
Copyright © Materials Research Society 2009

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