Nano-structured sandwich composites response to low-velocity impact

Ávila, Antônio F.; Carvalho, Maria G.; Dias, Eder C.; Cruz, Diego Thadeu Lopes da

doi:10.1016/j.compstruct.2009.09.010

Cited by 52 publications

(31 citation statements)

References 20 publications

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“…One of the proposed solutions is the modification of the thermoset resins with nano-sized organic and inorganic particles. Carbon nanotubes (CNT), carbon nanofibres and nanoclays were identified as potential nano-scale materials for the reinforcement of epoxy [19,20,[12][13][14]. Hosur et al [12] studied the improvement in low velocity impact response of sandwich plates due to the addition of nanoclays both in the facesheets as well as the polyurethane foam core.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have conducted low velocity impact tests on sandwich panels composed of different facesheets and core materials [6][7][8][9][10]. There has been considerable effort to improve the impact resistance of sandwich structures [11][12][13][14]. Dvorak and Suvorov [11] investigated the effect of placing a ductile interlayer between the facesheet and the foam core.…”

Section: Introductionmentioning

confidence: 99%

“…They identified different failure mechanisms in the sandwich panels with nanoclay and concluded that it was possible to sustain higher loads, reduce the damage size during impact like events and lower the reduction in mechanical properties by adopting nanophased sandwich construction. Avila et al [13] studied the effect of adding nanoclay to fibre glass/epoxy system and its use as facesheet in a sandwich structure. The authors varied the percentage of nanoclay present in the epoxy resin and studied the low velocity impact response of a GFRP/PS Foam sandwich plate.…”

Section: Introductionmentioning

confidence: 99%

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Effect of block copolymer nano-reinforcements on the low velocity impact response of sandwich structures

Ramakrishnan

Guérard

Viot

et al. 2014

Composite Structures

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tSandwich composites with fibre reinforced plastic (FRP) facesheets have emerged as a major class of lightweight structural materials in a wide range of engineering fields including aerospace, automotive and marine structures. This is due to attractive mechanical properties such as high specific stiffness and high strength. However, sandwich structures are susceptible to damage caused by impact. The objective of this paper is to evaluate the dynamic response of sandwich composites based on Kevlar fibre reinforced epoxy and Rohacell Ò foam. The improvement in impact performance of these sandwich structures that can be achieved by the addition of nanoparticles in the resin matrix is investigated. Nanostrength Ò , an acrylate triblock copolymer that self-assembles in the nanometer scale is added to the epoxy matrix. The effect of the nano-reinforcements on flat sandwich plates under low velocity impact is investigated at different scales. An instrumented drop tower setup is used for the low velocity impact tests of the sandwich plates with neat or nano-reinforced epoxy matrix, at different energies. The macroscopic response of the sandwich structure and the microscopic phenomena involved in dissipating the impact energy are identified and compared for sandwich plates with and without nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of block copolymer nano-reinforcements on the low velocity impact response of sandwich structures

Ramakrishnan

Guérard

Viot

et al. 2014

Composite Structures

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“…By using nano-reinforcement, it is expected that a low concentration brings significant improvements without scarifying other properties. Matrix toughened by nano-reinforcement have been demonstrated already [5][6][7], but few papers have been published on the mechanical behavior of multi-scale composites [8,9].…”

Section: Introductionmentioning

confidence: 99%

The influence of acrylate triblock copolymer embedded in matrix on composite structures’ responses to low-velocity impacts

Denneulin

Viot

Léonardi

et al. 2012

Composite Structures

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. In passive safety structures the use of composite materials has increased significantly recently due to their low specific mass and high energy absorption capacities. The purpose of this experimental study is to describe the macroscopic behaviors of different Kevlar woven composite materials with different kinds of matrix (pure and with acrylate based block copolymer additives: Nanostrength Ò ) under lowvelocity impact. Tests were performed with a drop weight tower on square plates (100 Â 100 mm 2 )clamped by means of a circular fixture. Images were recorded during impact by a high-speed video camera fixed underneath the plate. It was found that Kevlar epoxy composite material with Nanostrength M52N has the best resistance to perforation. The second purpose is to study the influence of physicochemical parameters (fibers ratio, percentage of M52N, micro-porosity) on the behavior of the selected composite material. Based on correlation between pictures, displacement, and loading histories, two criteria are defined to quantify the energy absorption capability of the composite material just before the fibers' failure and after perforation of the plate. A high-fiber weight improves performance regarding criteria and also improves the efficiency of the block copolymer present in the epoxy matrix.

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“…Avila et al [11] reported benefits in terms of energy absorption and failure modes with the nanoclays fillers on fiber glass/nano-modified epoxy face sheets and polystyrene foams. According to Reis et al [2], the lowest displacements and the highest elastic recuperation occur for sandwiches with resin nano-enhanced.…”

mentioning

confidence: 99%

Impact response of balsa core sandwiches

Mortas¹,

Reis²,

Ferreira³

2014

Frattura Ed Integrità Strutturale

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ABSTRACT. The benefits of resins nano-enhanced on the impact response of sandwich composites made by fiber glass/epoxy skins and balsa wood core were studied. Afterwards, the influence of the core's discontinuity was analyzed in terms of impact strength. For better dispersion and interface adhesion matrix/clay nanoclays were previously subjected to a silane treatment appropriate to the epoxy resin. Resins enhanced by nanoclays promote higher maximum impact loads, lower displacements and the best performance in terms of elastic recuperation. The core's discontinuity decreases the impact strength, but the resin enhanced by nanoclays promotes significant benefits.

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Nano-structured sandwich composites response to low-velocity impact

Cited by 52 publications

References 20 publications

Effect of block copolymer nano-reinforcements on the low velocity impact response of sandwich structures

Effect of block copolymer nano-reinforcements on the low velocity impact response of sandwich structures

The influence of acrylate triblock copolymer embedded in matrix on composite structures’ responses to low-velocity impacts

Impact response of balsa core sandwiches

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