Sandwich Panel Cores for Blast Applications: Materials and Graded Density

Kelly, M. W.; Arora, Hari; Worley, A.; Kaye, M.; Linz, Paolo Del; Hooper, Paul A.; Dear, John P.

doi:10.1007/s11340-015-0058-5

Cited by 28 publications

(15 citation statements)

References 17 publications

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“…These types are developed for use in both civil and military applications, but they are also commonly met in Sandwich composites are interesting for offshore and adaptable mechanical properties. Resistance air blast loading is not well understood [31], although initial studies on this topic have alrea . The analysed typologies are shown in the Fig.…”

Section: Resultsmentioning

confidence: 99%

“…These types are developed for use in both civil and military applications, but they are also commonly met in fshore applications due to their esistance of these systems to , although initial studies on this topic have already been Fig. 7 Sandwich panel with FRP skins and polymeric foam core [31] It is shown that sandwich panels made with GFRP skins and with Styrene Acrylonitrile (SAN) foam did not show any visible damage in the back face skins, as well as any cracking or tearing. The element managed to maintain its shape.…”

Section: Resultsmentioning

confidence: 99%

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17.06: Characterization of accidental scenarios for offshore structures

2017

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Offshore structures are complex facilities whose malfunction can lead to serious impacts and losses, such as human lives, environmental disasters and the complete loss of the structure. Additionally, the cost associated to their construction and maintenance is very high, so it is crucial to keep them fully operational throughout their entire service life. Standby periods in offshore platforms generate large financial losses for their owners. The most devastating effects on offshore platforms are often the result of incidents which eventually lead to accidental actions. Hence it is very important to develop measures which limit the effects of accidental actions on the overall performance of these facilities. In this paper the most likely accidental scenarios and the strategies currently used to mitigate their devastating effects were analysed. Accidental scenarios were discussed based on the available historical data of incidents on offshore platforms, and classified according to the type of offshore platform or the type of structural elements affected. Furthermore, the most frequent hazards were used to introduce specific accidental actions which will then be the subject of a study for comparing the approaches proposed by different technical standards. The strategies currently used for mitigating the effect of accidental actions, both non-structural and structural, were classified according to the materials used and the structural typology adopted. The objective of this study was to identify new opportunities for the development of innovative mitigation strategies for the devastating effects associated to accidental actions in offshore platforms, considering the most recent developments in terms of innovative materials and of structural analysis approaches. In this context, this paper discusses the current trends in research and the future challenges related to this issue. This will serve to identify the possible methods for improvement of the existing structural mitigation measures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

17.06: Characterization of accidental scenarios for offshore structures

2017

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“…The correction factor of 1.8 was included to take into account how close the charge is to the ground (Smith and Hetherington 1994). Based on the results of these calculations and on previous blast testing performed by Arora et al (2011) and Kelly et al (2015), a stand-off distance of 15 m was selected. The charge was raised to the centre height of the panels, 1.5 m from the ground by placing it on polystyrene blocks which absorb little blast energy.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Placing the interlayer behind the front skin or behind the core was found to reduce back-skin deflection. Kelly et al (2015) used GFRP skins and PP interlayers in the front skin of a composite sandwich panel. This panel was subjected to full-scale air blast loading and compared to a panel without the PP interlayers.…”

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confidence: 99%

Blast resilience of composite sandwich panels with hybrid glass-fibre and carbon-fibre skins

Rolfe

Quinn

Sancho

et al. 2018

Multiscale and Multidiscip. Model. Exp. and Des.

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The development of composite materials through hybridisation is receiving a lot of interest; due to the multiple benefits, this may bring to many industries. These benefits include decreased brittle behaviour, which is an inherent weakness for composite materials, and the enhancement of mechanical properties due to the hybrid effect, such as tensile and flexural strength. The effect of implementing hybrid composites as skins on composite sandwich panels is not well understood under high strain rate loading, including blast loading. This paper investigates the blast resilience of two types of hybrid composite sandwich panel against a full-scale explosive charge. Two hybrid composite sandwich panels were mounted at a 15 m stand-off distance from a 100 kg nitromethane charge. The samples were designed to reveal whether the fabric layup order of the skins influences blast response. Deflection of the sandwich panels was recorded using high-speed 3D digital image correlation (DIC) during the blast. It was concluded that the combination of glass-fibre reinforced polymer (GFRP) and carbon-fibre reinforced polymer (CFRP) layers in hybrid laminate skins of sandwich panels decreases the normalised deflection compared to both GFRP and CFRP panels by up to 41 and 23%, respectively. The position of the glass-fibre and carbon-fibre layers does not appear to affect the sandwich panel deflection and strain. A finite element model has successfully been developed to predict the elastic response of a hybrid panel under air blast loading. The difference between the maximum central displacement of the experimental data and numerical simulation was ca. 5% for the hybrid panel evaluated.

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“…Composite sandwich panels with hybrid skins have been shown to be beneficial in some cases. Kelly et al performed large scale blast testing on panels with GFRP skins and polypropylene (PP) interlayers [14]. The panel with PP interlayers had no front skin cracks compared to a panel with solely GFRP skins.…”

Section: Introductionmentioning

confidence: 99%

High Velocity Impact and Blast Loading of Composite Sandwich Panels with Novel Carbon and Glass Construction

Rolfe

Kaboglu

Quinn

et al. 2018

J. dynamic behavior mater.

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This research investigates whether the layup order of the carbon-fibre/glass-fibre skins in hybrid composite sandwich panels has an effect on impact response. Composite sandwich panels with carbon-fibre/glass-fibre hybrid skins were subjected to impact at velocities of 75 ± 3 and 90 ± 3 m s −1. Measurements of the sandwich panels were made using high-speed 3D digital image correlation (DIC), and post-impact damage was assessed by sectioning the sandwich panels. It was concluded that the introduction of glass-fibre layers into carbon-fibre laminate skins reduces brittle failure compared to a sandwich panel with carbon-fibre reinforced polymer skins alone. Furthermore, if the impact surface is known, it would be beneficial to select an asymmetrical panel such as Hybrid-(GCFGC) utilising glass-fibre layers in compression and carbon-fibre layers in tension. This hybrid sandwich panel achieves a specific deflection of 0.322 mm kg −1 m 2 and specific strain of 0.077% kg −1 m 2 under an impact velocity of 75 ± 3 m s −1. However, if the impact surface is not known, selection of a panel with a symmetric yet more dispersed hybridisation would be effective. By distributing the different fibre layers more evenly within the skin, less surface and core damage is achieved. The distributed hybrid investigated in this research, Hybrid-(GCGFGCG), achieved a specific deflection of 0.394 mm kg −1 m 2 and specific strain of 0.085% kg −1 m 2 under an impact velocity of 75 ± 3 m s −1. Blast loading was performed on a large scale version of Hybrid-(GCFGC) and it exhibited a maximum deflection of 75 mm following a similar deflection profile to those observed for the impact experiments.

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Sandwich Panel Cores for Blast Applications: Materials and Graded Density

Cited by 28 publications

References 17 publications

17.06: Characterization of accidental scenarios for offshore structures

17.06: Characterization of accidental scenarios for offshore structures

Blast resilience of composite sandwich panels with hybrid glass-fibre and carbon-fibre skins

High Velocity Impact and Blast Loading of Composite Sandwich Panels with Novel Carbon and Glass Construction

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