The ballistic resistance of thin aluminium plates with varying degrees of fixity along the circumference

Tiwari, G and Iqbal, MA and Gupta, PK and Gupta, NK (2014) The ballistic resistance of thin aluminium plates with varying degrees of fixity along the circumference. In: INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 74 . pp. 46-56.

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Abstract

The ballistic performance of thin aluminium targets and influence thereon of different circumferential fixity conditions were studied both experimentally and by finite element simulations. A pressure gun was employed to carry out the experiments while the numerical simulations were performed on ABAQUS/Explicit finite element code using Johnson-Cook elasto-viscoplastic material model. 1 mm thick 1100-H12 aluminium plates of free span diameter 255 mm were normally impacted by 19 mm diameter ogive and blunt nosed projectiles. The boundary conditions of the plate were varied by varying the region of fixity along its circumference as 100%, 75%, 50% and 25% in experiments and the numerical simulations. Further, simulations were carried out to compare the response of the plates with 50% and 75% continuous fixity with those with two and three symmetrical intermittent regions of 25% fixity respectively. The variation in the boundary condition has been found to have insignificant influence on the failure mode of the target however; it significantly affected the mechanics of target deformation and its energy absorption capacity. The ballistic limit increased with decrease in the region of fixity. It decreased for intermittent fixity in comparison with equivalent continuous fixity. And, it has been found to be higher for the impact with projectile having blunt nose in comparison with the one having ogive nose. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Varying fixity; Projectile shape; Ballistic limit; Thin plates
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	28 Nov 2014 04:31
Last Modified:	28 Nov 2014 04:31
URI:	http://eprints.iisc.ac.in/id/eprint/50322

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