Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam

Barbenchon, Louise Le; Kopp, Jean-Benoît; Girardot, Jérémie; Viot, Philippe

doi:10.1016/j.mechmat.2019.103271

Cited by 11 publications

(8 citation statements)

References 37 publications

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“…There are numerous studies in the literature on the fracture behaviour of materials and structures (Beguelin et al 1997(Beguelin et al , 1998Yoffe 1951;Broberg 1960;Freund 1972;Cros et al 2000;Irwin et al 1979;Sheng and Zhao 2000;Rosakis and Zehnder 1985;Ponson and Bonamy 2010;Fineberg and Bouchbinder 2015;Lebihain et al 2020; Le Barbenchon et al 2020;Ravi-Chandar 1998;Sharon and Fineberg 1999). Approaches in the analysis of the mechanism vary widely depending on the point of view.…”

Section: Introductionmentioning

confidence: 99%

Dynamic fracture in a semicrystalline biobased polymer: an analysis of the fracture surface

Kopp

Girardot

2020

Int J Fract

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The fracture behaviour of a semi-crystalline bio-based polymer was studied. Dynamic fracture tests on strip band specimens were carried out. Fracture surfaces were observed at different scales by optical and electron microscopy to describe cracking scenarios. Crack initiation, propagation and arrest zones were described. Three distinct zones are highlighted in the initiation and propagation zone: a zone with conical markings, a mist zone and a hackle zone. The conical mark zone shows a variation in the size and density of the conical marks along the propagation path. This is synonymous with local speed variation. Microcracks at the origin of the conical marks in the initiation zone seem to develop from the nucleus of the spherulites. In the propagation zone with complex roughness, the direction of the microcracks and their cracking planes are highly variable. Their propagation directions are disturbed by the heterogeneities of the material. They branch or bifurcate at the level of the spherulites. In the arrest zone, the microcracks developed upstream continue to propagate in different directions. The surface created is increasingly smoother as the energy release rate decreases. It is shown that the local velocity of the crack varies in contrast to the macroscopic speed. A

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Section: Introductionmentioning

confidence: 99%

Dynamic fracture in a semicrystalline biobased polymer: an analysis of the fracture surface

Kopp

Girardot

2020

Int J Fract

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“…Between 60 and 100°C, it is even negligible. For this kind of cork agglomerates, 20°C is considered to be the glass transition temperature T g [8], which is the temperature at which the modification of the mechanical behaviour in the α-transiton in maximal. Given the results from fig.…”

Section: Visco-elastic Behaviourmentioning

confidence: 99%

“…Therefore lower temperature leads to earlier macroscopic failure as ε * f rac (T ) decreases with temperature. In agglomerated cork, fracture mechanisms are mostly intra-granular [8]. This decrease in the fracture strain with temperature would thus be mainly due to the tensile embrittlement of the cork beads, and more precisely of the cork cell walls, with the drop in temperature.…”

Section: Temperature Effectmentioning

confidence: 99%

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Strain-rate dependency of bio-based cellular materials under a large range of temperature

et al. 2021

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Polymeric cellular materials are used in many different application domains such as transport, sport, food, health and energy. Therefore, the conditions of use of these materials represent wide temperature and strain-rate ranges. The mechanical behaviour of these foams demonstrate a strong dependency to it. In order to be able to predict such dependency, its origin has to be better understood. For this study, a bio-based cellular material, agglomerated cork, has been chosen to evaluate the temperature and strain-rate dependency of the mechanical behaviour. The visco-elastic behaviour of the material was first studied between −80°C and 100°C at frequencies between 0.01 Hz and 100 Hz. The compressive mechanical behaviour was then studied on a large range of temperature (from −30°C to 100°C) and strain rates (from 4.2 10−5 s−1 to 1250 s−1). A specific set-up was finally used to operate dynamic tests at low and high temperature. These results were used to discuss the evolution of the mechanical beahviour with these environnemental conditions based on the knowledge of the mechanical behaviour of the constitutive materials.

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“…Polymeric foams are widely used in protective applications due to their high energy absorption capability [1][2][3], and the properties of a variety of open-cell and closed-cell foams have been widely studied under quasi-static compression [4][5][6], impact, and high strain rate loading conditions [7,8]. Foam materials and other materials can be combined into composite materials with excellent properties as needed [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

2021

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Foams are widely used in protective applications requiring high energy absorption under impact, and evaluating impact properties of foams is vital. Therefore, a novel test method based on a shock tube was developed to investigate the impact properties of closed-cell polyethylene (PE) foams at strain rates over 6000 s−1, and the test theory is presented. Based on the test method, the failure progress and final failure modes of PE foams are discussed. Moreover, energy absorption capabilities of PE foams were assessed under both quasi-static and high strain rate loading conditions. The results showed that the foam exhibited a nonuniform deformation along the specimen length under high strain rates. The energy absorption rate of PE foam increased with the increasing of strain rates. The specimen energy absorption varied linearly in the early stage and then increased rapidly, corresponding to a uniform compression process. However, in the shock wave deformation process, the energy absorption capacity of the foam maintained a good stability and exhibited the best energy absorption state when the speed was higher than 26 m/s. This stable energy absorption state disappeared until the speed was lower than 1.3 m/s. The loading speed exhibited an obvious influence on energy density.

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Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam

Cited by 11 publications

References 37 publications

Dynamic fracture in a semicrystalline biobased polymer: an analysis of the fracture surface

Dynamic fracture in a semicrystalline biobased polymer: an analysis of the fracture surface

Strain-rate dependency of bio-based cellular materials under a large range of temperature

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

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