Asymmetric microcellular composites: Mechanical properties and modulus prediction

Tissandier, Cédric; González‐Núñez, Rubén; Rodrigue, Denis

doi:10.1177/0021955x14566208

Cited by 9 publications

(11 citation statements)

References 69 publications

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“…This transition can be mechanically interesting as creating a density/composition gradient that can remove stress concentration point and properties discontinuities as reported for density gradient materials (DGM) [19]. growth in the outer layer (close to the mold wall) from the heterogeneous nucleating effect of the fibers acting as nucleating agents [8,33,34]. The presence of bubbles in the first layer when using ACA also explains the thickness increase as reported in Figure 5.…”

Section: Morphologymentioning

confidence: 85%

“…These voids, as well as the natural porosity of AF promote the migration of gas molecules to regions having higher temperature and void content [32]. This structure also helps bubble nucleation and growth in the outer layer (close to the mold wall) from the heterogeneous nucleating effect of the fibers acting as nucleating agents [8,33,34]. The presence of bubbles in the first layer when using ACA also explains the thickness increase as reported in Figure 5.…”

Section: Morphologymentioning

confidence: 95%

“…They are also susceptible to moisture absorption, which affects the dimensional stability and overall performance of the composites [7]. Nevertheless, under optimized processing parameters, they can be processed via injection [8], compression [9] and rotational molding, with properties and design suitable for any particular application [10].…”

Section: Introductionmentioning

confidence: 99%

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Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

et al. 2020

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In this work, the suitability for the production of sustainable and lightweight materials with specific mechanical properties and potentially lower costs was studied. Agave fiber (AF), an agro-industrial waste, was used as a reinforcement and azodicarbonamide (ACA) as a chemical blowing agent (CBA) in the production of bilayer materials via rotational molding. The external layer was a composite of linear medium density polyethylene (LMDPE) with different AF contents (0–15 wt %), while the internal layer was foamed LMDPE (using 0–0.75 wt % ACA). The samples were characterized in terms of thermal, morphological and mechanical properties to obtain a complete understanding of the structure-properties relationships. Increases in the thicknesses of the parts (up to 127%) and a bulk density reduction were obtained by using ACA (0.75 wt %) and AF (15 wt %). Further, the addition of AF increased the tensile (23%) and flexural (29%) moduli compared to the neat LMDPE, but when ACA was used, lower values (75% and 56% for the tensile and flexural moduli, respectively) were obtained. Based on these results, a balance between mechanical properties and lightweight can be achieved by selecting the AF and ACA contents, as well as the performance and aesthetics properties of the rotomolded parts.

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Section: Morphologymentioning

confidence: 85%

Section: Morphologymentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

et al. 2020

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“…There has been dedicated research in recent years to study the relationship between process, morphology and mechanical properties of the foams. [2][3][4] In general, elongational flow of molten foaming polymer leads to an anisotropic cell structure with elongated cells.…”

Section: Introductionmentioning

confidence: 99%

Effect of polymer foam anisotropy on energy absorption during combined shear-compression loading

Mosleh

Bosche

Depreitere

et al. 2017

Journal of Cellular Plastics

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Polymeric foams are extensively used in applications such as packaging, sports goods and sandwich structures. Since in-service loading conditions are often multi-axial, characterisation of foams under multi-axial loading is essential. In this article, quasi-static combined shear-compression behaviour of isotropic expanded polystyrene foam and anisotropic polyethersulfone foam was studied. For this, a testing apparatus which can apply combined compression and transverse shear loads was developed. The results revealed that the shear and compression energy absorption, yield stress and stiffness of foams are dependent on deformation angle. The total energy absorption of the anisotropic polyethersulfone foam is shown to be direction dependent in contrast to isotropic expanded polystyrene. Furthermore, for similar relative density, polyethersulfone foam absorbs more energy than expanded polystyrene foam, regardless of deformation angle. This study highlights the importance of correct positioning of foam cells in anisotropic foams with respect to loading direction to maximise energy absorption capability.

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“…The closed-cell TPU foam has a foamed core layer and two unfoamed skin layers, which will lead to the density distribution and stress concentration in the cross-section. It is well known that when the sample undergoes deformation, the stress is mainly supported by the high-density part, 46,47 and then the stress concentration will be induced in the skin-core structure. Considering these factors, we drew the schematic model of the closed-cell TPU foam in the loading process presented in Figure 7.…”

Section: Preparation Of Tpu Foams With Closed-cell or Open-cell Strucmentioning

confidence: 99%

Influence of cell type and skin-core structure on the tensile elasticity of the microcellular thermoplastic polyurethane foam

Wang

Zhai

2019

Journal of Cellular Plastics

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In this work, the foaming process was employed to achieve lightweight thermoplastic polyurethane materials, and then the hysteresis and residual strain of corresponding materials in the tensile process were quantitatively calculated. In order to study the deformed mechanism, the influences of cell type and skin-core structure on the tensile elasticity of thermoplastic polyurethane foam were investigated. The open-cell thermoplastic polyurethane foam exhibited much lower hysteresis and residual strain compared to thermoplastic polyurethane film without cell structure, which demonstrated that the open-cell structure benefited to the tensile elasticity. In the case of closed-cell thermoplastic polyurethane foam, it had lower hysteresis and residual strain than thermoplastic polyurethane film; however, higher value than the thermoplastic polyurethane film can be observed beyond 100% strain, resulting from the stress concentration in the skin-core structure. Consequently, the hysteresis phenomenon can be improved by adjusting the ratio of skin-core structure. Moreover, the influence of density on the elasticity of the open-cell thermoplastic polyurethane foam was also discussed in this study.

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Asymmetric microcellular composites: Mechanical properties and modulus prediction

Cited by 9 publications

References 69 publications

Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

Effect of polymer foam anisotropy on energy absorption during combined shear-compression loading

Influence of cell type and skin-core structure on the tensile elasticity of the microcellular thermoplastic polyurethane foam

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