Vol. 2, No. 7, 2007

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ISSN: 1559-3959
Protection performance of double-layered metal shields against projectile impact

Xiaoqing Teng, Sumita Dey, Tore Børvik and Tomasz Wierzbicki

Vol. 2 (2007), No. 7, 1309–1329
Abstract

This paper critically evaluates the protection performance of double-layered shields against projectile impact at the subordnance velocity using finite element methods. Four types of projectiles of different weight and nose shape are considered, representing various fragments generated from Improvised Explosive Devices (IEDs). It is found that the double-layer configuration is able to improve the ballistic resistance by 8.0%25.0% for the flat-nose projectile, compared to the monolithic plate of the same weight. The upgrade is due to the transition of the failure mode from less energy dissipating shear plugging to more energy dissipating tensile tearing. Under impact by the conical-nose projectile, the double-layered target is almost as capable as the monolithic plate. The present research helps resolve the long outstanding issue of the protection effectiveness of the double-layer configuration.

Keywords
double layer, projectile, perforation, fragments
Milestones
Received: 2 January 2007
Accepted: 12 March 2007
Published: 1 September 2007
Authors
Xiaoqing Teng
Impact and Crashworthiness Lab
Massachusetts Institute of Technology
77 Massachusetts Avenue, Room 5-218
Cambridge, MA 02139
United States
Sumita Dey
Structural Impact Laboratory
Norwegian University of Science and Technology
Rich. Birkelands vei 1A, NO-7491
Trondheim
Norway
Tore Børvik
Structural Impact Laboratory
Norwegian University of Science and Technology
Rich. Birkelands vei 1A, NO-7491
Trondheim
Norway
Tomasz Wierzbicki
Impact and Crashworthiness Lab
Massachusetts Institute of Technology
77 Mass Avenue, Room 5-218
Cambridge, MA 02139
United States