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

Loganathan, Sunith Babu; Shivanand, H. K.

doi:10.4236/jmmce.2015.33019

Cited by 6 publications

(10 citation statements)

References 15 publications

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“…Although the H25 specimen was heavier, it absorbed higher specific energy than the H15 specimen. Similar results were observed in another study [49]. Authors found that the increase in the foam core thickness could improve the specific energy absorption amount of the same skinned sandwich composite under an impact event.…”

Section: Single Foam Core Sandwich (Sfs) Design With Ashwood Skinsupporting

confidence: 87%

Experimental investigation on low-velocity impact response of wood skinned sandwich composites with different core configurations

Demircioğlu

Balıkoğlu

İnal

et al. 2018

Materials Today Communications

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In this paper, an experimental investigation on the low-velocity impact response of wood skinned hybrid sandwich composites was presented. Several alternative design configurations were developed by using rubber-cork and E-glass composite layers between the foam core and wood skin in order to improve the impact performance of conventional sandwich composites. Low-velocity impact (LVI) testing was performed using a drop weight test machine at different impact energies and destructive cross-sectioning was performed to examine the interior damage growth and penetration depth of the specimens. The impact performance of the specimens was evaluated in terms of energy absorption capacity, maximum contact force and penetration depth. The multi-core design concept significantly improved the energy absorption capacity with a reduced extent of impact induced damage. The proportion of recyclable materials in each configuration and the energy absorption level per unit cost were also presented for the interest of product designers.

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Section: Single Foam Core Sandwich (Sfs) Design With Ashwood Skinsupporting

confidence: 87%

Experimental investigation on low-velocity impact response of wood skinned sandwich composites with different core configurations

Demircioğlu

Balıkoğlu

İnal

et al. 2018

Materials Today Communications

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“…Polyurethane (PU) foam has a porous structure, low production cost, easy processing, and good controllability, all of which make it a superior candidate for cushioning materials. Such composites can absorb energy caused by an impact or vibration by breakage, fracture, bending, and friction against porous cell walls, thereby protecting commodities [1]. The addition of nanoparticles, graphene, carbon nanotube, and silica can improve the mechanical properties of PU foam [2,3].…”

Section: Introductionmentioning

confidence: 99%

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Wang

Ren

et al. 2019

Polymers

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In this article, expanded vermiculite (EV)-enhanced polyurethane foam bionic composites inspired by pomelo peel is proposed. The columnar lattice structure mold is employed to constitute the periodic interface structure and gradient foam structure, and the nylon nonwoven fabric is combined as the surface layer. The effects of EV content on the thermal, compression, and dynamic cushion properties of bionic composites are investigated. Results show that residual char increases with EV content, which conduces to decrease the release of heat flow. The proposed bionic composite with columnar lattice structure has optimal compressive modulus, energy absorption and dynamic cushion efficacy when 1 wt% EV is added. However, its performance decreases slowly when EV fillers are continuously added because the cell morphology is changed from round to irregular shape and the interfacial adhesion of filler–matrix is weakened. Owing to their unique bionic structure, composites can absorb 99% of the energy impacted by flat impactor within a smaller deformation and achieve 97% absorption efficiency for a hemispheric impactor in cushion test.

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“…There is a wealth of research studies available that have focused on the dynamic impact behavior of foam core sandwich composites [10–21]. Most of these prior studies have focused on low-velocity impact loading at room temperature (25°C).…”

Section: Introductionmentioning

confidence: 99%

“…Loganathan et al. [16] explored the effect of core thickness (10 and 14 mm) and density (70, 100 and 200 kg/m 3 ) of bi-directional woven E-glass/epoxy sandwich composite with polyurethane foam core under three different impact velocities (1.401, 2.426 and 3.123 m/s). They observed that the samples absorbed more energy with increasing core density and thickness.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the mechanisms of damage in foam core sandwich composites under impact loading and low temperatures

Castellanos

Prabhakar

2021

Jnl of Sandwich Structures & Materials

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Recent interest in Arctic exploration has brought new challenges concerning the mechanical behavior of lightweight materials for offshore structures. Exposure to seawater and cold temperatures are known to degrade the mechanical properties of several materials, thus, compromising the safety of personnel and structures. This study aims to investigate the low-velocity impact behavior of woven carbon/vinyl ester sandwich composites with Polyvinyl chloride (PVC) foam core at low temperatures for marine applications. The tests were performed in a drop tower impact system with an in-built environmental chamber. Impact responses, such as the contact force, displacement and absorbed energy, at four impact energies of 7.5 J, 15 J, 30 J, and 60 J were determined at four in-situ temperatures of 25°C, 0°C, −25°C and −50°C. Results showed that temperature has a significant influence on the dynamic impact behavior of sandwich composites. The sandwich composites were rendered stiff and brittle as the temperature decreased, which has a detrimental effect on their residual strength and durability. At 7.5 J at all temperatures, the samples experienced matrix cracking, fiber fracture, and delamination at the top face sheet. The samples impacted at 15 J at all temperatures experienced fiber fracture, matrix cracking, and delamination at the top facesheet and localized core crushing/fracture. At 30 J for all the temperatures, the samples exhibited perforation of the top facesheet and penetration into the core. As the temperature decreased, the penetration of the striker into the core increased. At 60 J for all temperatures, the samples experienced perforation of the top facesheet and core, and the back facesheet exhibited varying extent of damage. At −25°C and −50°C, the sandwich composite samples were almost completely perforated. In general, low temperatures rendered the sandwich composites stiff and brittle, resulting in an increase in the degree of damage and more pronounced damage modes. At all impact energies, the sandwich composites were rendered stiff and brittle as the temperature decreased, which has a detrimental effect on their residual strength and durability.

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

Cited by 6 publications

References 15 publications

Experimental investigation on low-velocity impact response of wood skinned sandwich composites with different core configurations

Experimental investigation on low-velocity impact response of wood skinned sandwich composites with different core configurations

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Elucidating the mechanisms of damage in foam core sandwich composites under impact loading and low temperatures

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