Perforation of cellular sandwich plates

Goldsmith, Werner; Wang, Gau-Tung; Li, Kezhun; Crane, Deborah J.

doi:10.1016/s0734-743x(97)00003-1

Cited by 37 publications

(19 citation statements)

References 15 publications

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“…However, the common testing technique at higher velocity consists in launching with a gas gun a free flying projectile against an immobile target [4][5][6]. Such a technique is also used in the case of sandwich panels [7,8]. The main records were velocities before and after perforation of the panel and there was a lack of whole perforating force-displacement history.…”

Section: Introductionmentioning

confidence: 99%

Perforation of aluminium foam core sandwich panels under impact loading—An experimental study

Zhao

Elnasri

Girard

2007

International Journal of Impact Engineering

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This paper reports an original inverse perforation tests on foam core sandwich panels under impact loading. The key point is the use of an instrumented Hopkinson pressure bar as a perforator and at the same time a measuring device. It aims at a high quality piercing force record during the whole perforation process, which is a weak point of common freeflying projectile-target testing schemes.This new testing arrangement allows for the measurement of piercing force-displacement curves under quasi-static and impact loadings of sandwich samples, which is made of 40 mm AlSi 7 Mg 0.5 Cymat foam cores and 0.8 mm thick 2024 T3 aluminium sheets as top and bottom skins (incident and distal side facesheets). Compared with quasi-static top skin peak loads (the maximal load before the perforation of top skins) obtained under same geometric and clamping conditions, a significant enhancement under impact loading (25%) of the top skin peak load is found. However, the used foam core and skin sheet are known and have been confirmed to be hardly rate sensitive by separate tests on foam cores as well as on the skin sheets.A possible explanation of these puzzling results is following: the foam core under the perforator was locally more compressed under impact loading because of the inertia effect. As the used foam cores has a quite important strain hardening behaviour, the strength of foam cores before the failure of the top skin is higher than that under quasi-static loading, which leads to an increase of the top skin peak load under impact loading. Tests on a uniformly pre-compressed sandwich sample exhibit indeed higher top skin peak loads, which supports also this aforementioned concept. r

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Section: Introductionmentioning

confidence: 99%

Perforation of aluminium foam core sandwich panels under impact loading—An experimental study

Zhao

Elnasri

Girard

2007

International Journal of Impact Engineering

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“…A study by Goldsmith et al [17] concentrated on aluminum panels with honeycomb cores while Zhao et al [18] have investigated the perforation of aluminum foam core panels. The ballistic performance of sandwich plates compared to monolithic plates of equal areal mass is as yet not clearly understood and the role of the parent material of the sandwich plates has not been clearly elucidated.…”

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confidence: 99%

Impact response of sandwich plates with a pyramidal lattice core

Yungwirth

Wadley

O'Connor

et al. 2008

International Journal of Impact Engineering

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“…Figure 5 shows the relation between the striking velocity and the residual velocity for both neat and nanophased sandwich structures. The curves show a linear relation which is typical if the striking velocity exceeds the ballistic limit [7]. It is also observed that the neat sandwich shows higher residual velocity than the nanophased sandwich.…”

Section: Ballistic Performancementioning

confidence: 59%

“…However, the situation is somewhat different in case of core materials. Goldsmith et al [7] reported that the location of initial contact point is a critical issue for impact in core materials. When the first contact occurred along a cell axis, cell wall resulted in an out-of-plane deformation followed by in-plane distortion after the striker moved to a more central position during the course of the perforation.…”

mentioning

confidence: 99%

Improving Ballistic Performance of Polyurethane Foam by Nanoparticle Reinforcement

Uddin

Mahfuz

Zainuddin

et al. 2009

Journal of Nanotechnology

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We report improving ballistic performance of polyurethane foam by reinforcing it with nanoscale TiO 2 particles. Particles were dispersed through a sonic cavitation process and the loading of particles was 3 wt% of the total polymer. Once foams were reinforced, sandwich panels were made and impacted with fragment simulating projectiles (FSPs) in a 1.5-inch gas gun. Projectile speed was set up to have complete penetration of the target in each experiment. Test results have indicated that sandwich with nanophased cores absorbed about 20% more kinetic energy than their neat counterpart. The corresponding increase in ballistic limit was around 12% over the neat control samples. The penetration phenomenon was also monitored using a high-speed camera. Analyses of digital images showed that FSP remained inside the nanophased sandwich for about 7 microseconds longer than that of a neat sandwich demonstrating improved energy absorption capability of the nanoparticle reinforced core. Failure modes for energy absorption have been investigated through a microscope and high-speed images.

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Perforation of cellular sandwich plates

Cited by 37 publications

References 15 publications

Perforation of aluminium foam core sandwich panels under impact loading—An experimental study

Perforation of aluminium foam core sandwich panels under impact loading—An experimental study

Impact response of sandwich plates with a pyramidal lattice core

Improving Ballistic Performance of Polyurethane Foam by Nanoparticle Reinforcement

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