Experimental study of the low-velocity impact behaviour of primary sandwich structures in aircraft

Leijten, Joris; Bersee, H.E.N.; Bergsma, Otto; Beukers, Adriaan

doi:10.1016/j.compositesa.2008.10.019

Cited by 54 publications

(37 citation statements)

References 13 publications

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“…As a lightweight energy-absorbing material, aluminum foam has been widely used in modern industries such as automotive industry and aerospace engineering [1][2][3]. Interests in mechanical properties of this material especially the energy-absorbing mechanism have been growing in the decade [4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A testing method for tearing energy of aluminum foams

Shi

et al. 2014

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

A testing method for tearing energy of aluminum foams

Shi

et al. 2014

Materials Science and Engineering: A

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“…Hence, studies on low velocity impact behavior on aerospace application are very essential. Although much of the research has been done on Rohacell and PVC based foams as core material for sandwich composites [11]- [13], very limited research has been carried out on polyurethane based foam core sandwich composites subject to low velocity impact. One main issue with low velocity impact is the visibility of impacted region (BVID = Barely Visible Impact Damage).…”

Section: Introductionmentioning

confidence: 99%

Effect of Core Thickness and Core Density on Low Velocity Impact Behavior of Sandwich Panels with PU Foam Core

Loganathan¹,

Shivanand²

2015

JMMCE

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Composite sandwich structures are highly proven materials that provide high strength to weight ratio. However research works are still being carried out in the area of impact characteristics of sandwich composites. This paper provides a better understanding on the effect of core density and core thickness of sandwich panels subject to low velocity drop test. Specific energy absorption capacity of sandwich panels is obtained and factors affecting the same are explored with facings made of woven glass fiber laminates and polyurethane foam core with three different densities of 70 Kg/m 3 , 100 Kg/m 3 , 200 Kg/m 3 .

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“…As shown by Viot [13], polymeric foam behaviour varies dramatically with increased loading rates, so the research presented in this paper investigates the different blast responses of foams with similar quasi-static mechanical properties, but with different dynamic material properties and varying polymer types. Dynamic studies have been performed on all three polymer types studied in this research, an example of which is the low velocity drop weight tests performed by Leijten et al [14], on PMI foam core sandwich panels for use in aircraft. The foams used in this research have also been tested in high rate, the results of which are presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

Sandwich Panel Cores for Blast Applications: Materials and Graded Density

et al. 2015

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Sandwich composites are of interest in marine applications due to their high strength-to-weight ratio and tailorable mechanical properties, but their resistance to air blast loading is not well understood. Full-scale 100 kg TNT equivalent air blast testing at a 15 m stand-off distance was performed on glass-fibre reinforced polymer (GFRP) sandwich panels with polyvinyl chloride (PVC); polymethacrylimid (PMI); and styrene acrylonitrile (SAN) foam cores, all possessing the same thickness and density. Further testing was performed to assess the blast resistance of a sandwich panel containing a stepwise graded density SAN foam core, increasing in density away from the blast facing side. Finally a sandwich panel containing compliant polypropylene (PP) fibres within the GFRP front face-sheet, was subjected to blast loading with the intention of preventing front face-sheet cracking during blast. Measurements of the sandwich panel responses were made using high-speed digital image correlation (DIC), and post-blast damage was assessed by sectioning the sandwich panels and mapping the The Royal British Legion Centre for Blast Injury Studies and Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK damage observed. It was concluded that all cores are effective in improving blast tolerance and that the SAN core was the most blast tolerant out of the three foam polymer types, with the DIC results showing a lower deflection measured during blast, and post-blast visual inspections showing less damage suffered. By grading the density of the core it was found that through thickness crack propagation was mitigated, as well as damage in the higher density foam layers, thus resulting in a smoother back face-sheet deflection profile. By incorporating compliant PP fibres into the front face-sheet, cracking was prevented in the GFRP, despite damage being present in the core and the interfaces between the core and face-sheets.

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Experimental study of the low-velocity impact behaviour of primary sandwich structures in aircraft

Cited by 54 publications

References 13 publications

A testing method for tearing energy of aluminum foams

A testing method for tearing energy of aluminum foams

Effect of Core Thickness and Core Density on Low Velocity Impact Behavior of Sandwich Panels with PU Foam Core

Sandwich Panel Cores for Blast Applications: Materials and Graded Density

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