The Effects of Air and Underwater Blast on Composite Sandwich Panels and Tubular Laminate Structures |
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Authors: | H Arora P A Hooper J P Dear |
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Institution: | (1) Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK; |
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Abstract: | The resistance of glass-fibre reinforced polymer (GFRP) sandwich panels and laminate tubes to blast in air and underwater
environments has been studied. Procedures for monitoring the structural response of such materials during blast events have
been devised. High-speed photography was employed during the air-blast loading of GFRP sandwich panels, in conjunction with
digital image correlation (DIC), to monitor the deformation of these structures under shock loading. Failure mechanisms have
been revealed by using DIC and confirmed in post-test sectioning. Strain gauges were used to monitor the structural response
of similar sandwich materials and GFRP tubular laminates during underwater shocks. The effect of the backing medium (air or
water) of the target facing the shock has been identified during these studies. Mechanisms of failure have been established
such as core crushing, skin/core cracking, delamination and fibre breakage. Strain gauge data supported the mechanisms for
such damage. These studies were part of a research programme sponsored by the Office of Naval Research (ONR) investigating
blast loading of composite naval structures. The full-scale experimental results presented here will aid and assist in the
development of analytical and computational models. Furthermore, it highlights the importance of support and boundary conditions
with regards to blast resistant design. |
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Keywords: | |
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