Failure Modes of Foam Core Sandwich Beams under Static and Impact Loads

Lim, Tae Seong; Lee, Chang Sup; Lee, Dai Gil

doi:10.1177/0021998304044760

Cited by 97 publications

(75 citation statements)

References 17 publications

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“…A typical solution is to use sandwich structures, where the composite skins provide stiffness and strength, and a light crushable core dissipates damage and energy. Sandwich structures used under crushing [4,5] or bending [6,7] show greater specific energy absorptions than the monolithic counterparts.…”

Section: Introductionmentioning

confidence: 99%

Wavy-ply sandwich with composite skins and crushable core for ductility and energy absorption

Pimenta

Robinson

2014

Composite Structures

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Conventional composite materials offer high specific stiffness and strength, but suffer from low failure strains and failure without warning. This work proposes a new design for sandwich structures with symmetrically-wavy composite skins and a crushable foam core, aiming to achieve large strains (due to unfolding of the skins) and energy absorption (due to crushing of the foam core) under tensile loading. The structure is designed by a combination of analytical modelling and finite element simulations, and the concept is demonstrated experimentally.When loaded under quasi-static tension, wavy-ply sandwich specimens with carbon-epoxy skins and optimised geometry exhibited an average failure strain of 8.6%, a specific energy dissipated of 9.4 kJ/kg, and ultimate strength of 1570 MPa. The scope for further developing the wavy-ply sandwich concept and potential applications requiring large deformations and energy absorption are discussed.

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Section: Introductionmentioning

confidence: 99%

Wavy-ply sandwich with composite skins and crushable core for ductility and energy absorption

Pimenta

Robinson

2014

Composite Structures

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“…The average values of the carbon/carbon and glass/glass interface properties, such as stiffness and strength, were used for the glass/carbon interface. The glass/foam and carbon/foam interface strengths were deemed to be equal to the strength of the foam (Lim et al 2004;Rizov et al 2005). The estimated material properties for the stitched glass fabrics/epoxy, stitched carbon fabrics/epoxy and PVC foam are shown in Table 3.…”

Section: Materials Propertiesmentioning

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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“…Shipsha et al (2003) study failure mechanism and modeling of impact damage in sandwich beams through an experimental investigation, and the different failure modes involved are characterized. Lim et al (2004) study failure modes of foam core sandwich beams under static and impact loads. Different failure modes of sandwiches (Figure 2) with different density and face sheet dimensions under different impact velocities are characterized.…”

Section: Impact Damage In Composite and Sandwich Structuresmentioning

confidence: 99%