Abstract

Large-scale glass fibre reinforced polymer (GFRP) and carbon fibre reinforced polymer (CFRP) sandwich structures (1.6 m x 1.3 m) were subject to explosive air blast (100 kg TNT equivalent) at stand-off distances of 14 m. Digital image correlation (DIC) was used to obtain full-field data for the rear-face of each deforming target. A steel plate of comparable mass per unit area was also subjected to the same blast conditions for comparison. The experimental data was then verified with finite element models generated in Abaqus/Explicit. Close agreement was obtained between the numerical and experimental results, confirming that the CFRP panels had a superior blast performance to the GFRP panels. Moreover all composite targets sustained localised failures (that were more severe in the GFRP targets) but retained their original shape post blast. The rear-skins remained intact for each composite target with core shear failure present.

Highlights

  • The recent advancements in composite manufacturing have occurred predominantly in the aerospace, marine, automotive and related industries

  • This paper has shown that increasing the stiffness of the panel for the same mass per unit area of the panel material is an important parameter in reducing damage generated

  • The carbon fibre reinforced polymer (CFRP) skins showed little damage compared to the Glass fibre reinforced polymer (GFRP) equivalent skins when panels were constructed of the same mass per unit area and thickness dimension

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Summary

Introduction

The recent advancements in composite manufacturing have occurred predominantly in the aerospace, marine, automotive and related industries. Composites behave in different ways to steels, which have predominantly isotropic properties. This leads to a need for new design protocols to be developed for the safety of naval craft. Glass fibre reinforced polymer (GFRP) and carbon fibre reinforced polymer (CFRP) composites are quickly finding application in the construction of naval structures as well as new polymer fibre hybrids. These materials can be subject to increasingly demanding and varied conditions during service. The research presented in this paper focuses on air-blast loading of sandwich composite panels and finite element (FE) modelling of these air-blast conditions

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