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Research Papers

An Experimental Technique to Characterize the Dynamic Response of Materials, or Material Combinations, to Explosive Blast

[+] Author and Article Information
Frederik J. Mostert, Izak M. Snyman, Marius Olivier

 Defence Peace Safety and Security, CSIR, PO Box 395, 0001 Pretoria, South Africa

J. Appl. Mech 78(5), 051008 (Jul 28, 2011) (8 pages) doi:10.1115/1.4004333 History: Received November 24, 2010; Revised May 24, 2011; Published July 28, 2011; Online July 28, 2011

An experimental technique is demonstrated whereby the dynamic deflection of a thin plate or combination of plates, impulsively loaded by the blast of an explosive charge, can be characterized. A blast pendulum measures the resulting impulse simultaneously. The technique utilizes a cylindrical adapter that is fixed onto the blast pendulum into which a helical array of laser diode and receiver pairs are fitted. The output of the receivers is electronically coupled and a cascade voltage plot is obtained as the deforming plate interrupts the aligned light beams. It is found that the technique yields good results of the dynamic motion of the plates as long as the deformation of the specimen is symmetrical.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of the deflection gauge

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Figure 2

Mounting of the laser diodes in the deflection gauge

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Figure 3

Phototransistors mounted in parallel

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Figure 4

Calibration recording for the deflection gauge

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Figure 5

Pendulum setup with the measurement fixture at DBEL

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Figure 6

Experimental setup fitted on the pendulum

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Figure 7

The signals obtained from the laser displacement meter of the motion of the blast pendulum

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Figure 8

Recorded voltage plot

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Figure 9

Midpoint deflection time plot

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Figure 10

Recorded failure of an aluminum specimen

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Figure 11

Impulse of the samples as measured on the pendulum

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Figure 12

Distance-time plot for aluminum samples at different standoff

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Figure 13

Evidence of asymmetric deformation in sample 2

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Figure 14

Comparison of the midpoint deflection of the mild steel sample

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Figure 15

Examples of a plate and sandwich configurations after the tests

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Figure 16

Strain rate versus time for shot 1 in series 1

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Figure 17

The imparted impulse measured with the blast pendulum

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