Impact behavior of sandwich structures made of flax/epoxy face sheets and agglomerated cork

Sarasini, Fabrizio; Tirillò, Jacopo; Lampani, Luca; Barbero, Ever J.; Sánchez-Sáez, S.; Valente, Teodoro; Gaudenzi, Paolo; Scarponi, Claudio

doi:10.1080/15440478.2018.1477084

Cited by 24 publications

(13 citation statements)

References 53 publications

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“…To obtain this velocity, a least-squares method was used, by fitting Equation (1) which is similar to that proposed in the model of Recht and Ipson [39]. This method has been used successfully to predict the minimum perforation velocity in laminate and sandwich structures subjected to high velocity impacts [30,[40][41][42].…”

Section: Resultsmentioning

confidence: 99%

“…Sanchez-Saez et al [29] observed a great capacity to absorb energy even after several consecutive impacts. In addition, Sarasini et al [30] observed in their studies that the absorption of energy in high deformations can be quite considerable without signs of breaking of the cell walls, because an almost complete recovery of their original shape and size occurs.…”

Section: Resultsmentioning

confidence: 99%

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The High-Velocity Impact Behaviour of Kevlar Composite Laminates Filled with Cork Powder

et al. 2020

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The literature reports benefits when the cork powder obtained from industrial by-products is used as the filler of composite laminates. For example, while the fatigue life is insensitive to the presence of cork in the resin, significant improvements are achieved in terms of to low-velocity impact strength. However, in terms of ballistic domain, the literature does not yet report any study about the effect of incorporating powdered cork into resins. Therefore, this study intended to analyse the ballistic behaviour and damage tolerance of Kevlar/epoxy reinforced composites with matrix filled by cork powder. For this purpose, high-velocity impacts were studied on plates of Kevlar bi-directional woven laminates with surfaces of 100 × 100 mm2. It was possible to conclude that the minimum velocity of perforation is 1.6% higher when the cork powder is added to the resin, but considering the dispersion, this small difference can be neglected. In terms of damage areas, they are slightly lower when cork dust is added, especially for velocities below the minimum perforation velocity. Finally, the residual bending strength shows that these composites are less sensitive to impact velocity than the samples with neat resin. In addition to these benefits, cork powder reduces the amount of resin in the composite, making it more environmentally friendly.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The High-Velocity Impact Behaviour of Kevlar Composite Laminates Filled with Cork Powder

et al. 2020

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“…Moreover, the employment of two different specimen supports allowed to disclose the effect of boundary conditions highlighting a different impact susceptibility not only of the complete sandwich structures, but also of the sole cores and skins as a function of sample constraints. Concerning the ballistic behavior, Sarasini et al [146] and Sanchez-Saez et al [147] already addressed the topic investigating flax/epoxy and aluminum face sheets sandwich panels response, respectively. To further increase the data base in this field, some parameters neglected in the previous works were evaluated, i.e.…”

Section: Novelty and Implicationsmentioning

confidence: 99%

Experimental and finite element analysis of the impact response of agglomerated cork and its intraply hybrid flax/basalt sandwich structures

Sergi

Boria

Sarasini

et al. 2021

Composite Structures

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“…Among these green composites, the flax-reinforced biobased composites have been widely studied in recent years [ 18 , 19 , 20 , 21 ] due to the fact that flax fibre possesses high strength and stiffness in comparison to other natural plant fibres. For the “skin” material of the sandwich structure, flax fibres can be attractive alternatives due to the excellent properties of flax fibres [ 22 ]. For the “core” material, cork, a cellular material obtained from the bark of Cork Oak trees, can serve as an ideal material because it is 100% biodegradable and renewable with advantages, including low density, high shear modulus, damping ratio and impact resistance.…”

Section: Introductionmentioning

confidence: 99%

Moisture Absorption Effects on the Mechanical Properties of Sandwich Biocomposites with Cork Core and Flax/PLA Face Sheets

et al. 2021

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The aim of this study was to evaluate the moisture absorption behaviour and its influence on the mechanical properties of newly developed sandwich biocomposites with flax fibre-reinforced poly-lactic acid (PLA) face sheets and soft cork as the core material. Three different types of sandwich biocomposite laminates comprised of different layup configurations, namely, non-woven flax/PLA (Sample A), non-woven flax/PLA and cork as core (Sample B) and non-woven flax/paper backing/PLA, cork as core (Sample C), were fabricated. In order to evaluate the influence of moisture ingress on the mechanical properties, the biocomposites were immersed in seawater for a period of 1200 h. The biocomposites (both dry and water immersed) were then subjected to tensile, flexural and low-velocity falling weight impact tests. It was observed from the experimental results that the moisture uptake significantly influenced the mechanical properties of the biocomposites. The presence of the cork and paper in sample C made it more susceptible to water absorption, reaching a value of 34.33%. The presence of cork in the core also has a considerable effect on the mechanical, as well as energy dissipation, behaviours. The results of sample A exhibited improved mechanical performance in both dry and wet conditions compared to samples B and C. Sample A exhibits 32.6% more tensile strength and 81.4% more flexural strength in dry conditions than that in sample C. The scanning electron microscopy (SEM) and X-ray micro-CT images revealed that the failure modes observed are a combination of matrix cracking, core crushing and face core debonding. The results from this study suggest that flax/PLA sandwich biocomposites can be used in various lightweight applications with improved environmental benefits.

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Impact behavior of sandwich structures made of flax/epoxy face sheets and agglomerated cork

Cited by 24 publications

References 53 publications

The High-Velocity Impact Behaviour of Kevlar Composite Laminates Filled with Cork Powder

The High-Velocity Impact Behaviour of Kevlar Composite Laminates Filled with Cork Powder

Experimental and finite element analysis of the impact response of agglomerated cork and its intraply hybrid flax/basalt sandwich structures

Moisture Absorption Effects on the Mechanical Properties of Sandwich Biocomposites with Cork Core and Flax/PLA Face Sheets

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