Hybrid and Hierarchical Composite Materials

Kim, Chang Soo; Randow, Charles L.; Sano, Tomoko

doi:10.1007/978-3-319-12868-9

Cited by 24 publications

(8 citation statements)

References 567 publications

(770 reference statements)

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“…For instance, in [20], the homogenised properties of thermoelastic composites are studied by considering non-local integral operators for the characterisation of the stress-strain constitutive laws. In [20], the Author motivates the need for this constitutive choice by relating it to the complex geometrical and physical connections among the spatial length-scale of real materials, as is the case of hierarchical composite media [46].…”

Section: Scopes and Noveltiesmentioning

confidence: 99%

Two-scale, non-local diffusion in homogenised heterogeneous media

2021

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We study how and to what extent the existence of non-local diffusion affects the transport of chemical species in a composite medium. For our purposes, we prescribe the mass flux to obey a two-scale, non-local constitutive law featuring derivatives of fractional order, and we employ the asymptotic homogenisation technique to obtain an overall description of the species’ evolution. As a result, the non-local effects at the micro-scale are ciphered in the effective diffusivity, while at the macro-scale the homogenised problem features an integro-differential equation of fractional type. In particular, we prove that in the limit case in which the non-local interactions are neglected, classical results of asymptotic homogenisation theory are re-obtained. Finally, we perform numerical simulations to show the impact of the fractional approach on the overall diffusion of species in a composite medium. To this end, we consider two simplified benchmark problems, and report some details of the numerical schemes based on finite element methods.

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Section: Scopes and Noveltiesmentioning

confidence: 99%

Two-scale, non-local diffusion in homogenised heterogeneous media

2021

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“…There is a growing interest within both design and engineering communities to develop large-scale self-organizing materials and structures displaying programmable folding, curling or shaping phenomena [1][2][3]. Motivated by the opportunities and potential impact associated with this challenge, we harness a design and digital fabrication platform that attempts to link architectural-scale three-dimensional folding with the induction of anisotropy at the molecular scale.…”

Section: Introductionmentioning

confidence: 99%

“…Form modulation often occurs in biological systems in response to environmental forcing [ 1 , 23 ], through the cooperative integration of shape, structure and material—as well as through biologically hardcoded processes operating simultaneously within organically grown tissues [ 4 , 23 , 24 ]. Bending, folding and other such self-shaping forms in these cases often occur owing to the presence of residual internal stresses rather than through the application of externally imposed mechanical stresses [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Bending, folding and other such self-shaping forms in these cases often occur owing to the presence of residual internal stresses rather than through the application of externally imposed mechanical stresses [ 2 ]. These pre-programmed biological strategies for achieving shape tunability include (i) the controlled orientation of material reinforcement, (ii) the asymmetric distribution of material reinforcement, and (iii) the breakdown and reorganization of material reinforcement [ 1 ]. Because the first two strategies include environmentally responsive materials that frequently do not require the input of cellular energy (as described below), they provide fertile ground for research on programmable matter and active technical composites [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, at the nanoscale, DNA self-assembles into helices [ 2 ] using chiral twisting, while linear polypeptide chains fold to form three-dimensional proteins with different structures, properties and functions [ 30 , 31 ]. At the micro-scale, helical self-shaping occurs in climbing plant tendrils and orchid tree seed pods using passive means in search for minimum energy configurations driven by material reinforcement within inner fibre architectures [ 1 , 33 ]. Water also plays an important role in plant self-shaping [ 34 , 35 ], with folding by shrinking and swelling of plant tissue in leaves, stems and roots driven by a close interplay between internal water content and cell turgor pressure [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

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Driving macro-scale transformations in three-dimensional-printed biopolymers through controlled induction of molecular anisotropy at the nanoscale

Mogas-Soldevila,

Duro-Royo,

Lizardo

et al. 2024

Interface Focus.

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Motivated by the need to harness the properties of renewable and biodegradable polymers for the design and manufacturing of multi-scale structures with complex geometries, we have employed our additive manufacturing platform that leverages molecular self-assembly for the production of metre-scale structures characterized by complex geometries and heterogeneous material composition. As a precursor material, we used chitosan, a chemically modified form of chitin, an abundant and sustainable structural polysaccharide. We demonstrate the ability to control concentration-dependent crystallization as well as the induction of the preferred orientation of the polymer chains through the combination of extrusion-based robotic fabrication and directional toolpathing. Anisotropy is demonstrated and assessed through high-resolution micro-X-ray diffraction in conjunction with finite element simulations. Using this approach, we can leverage controlled and user-defined small-scale propagation of residual stresses to induce large-scale folding of the resulting structures.

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Production and characterization of a hybrid polymer matrix composite

2017

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The aim of this study was to develop low cost hybrid composites with enhanced mechanical properties by the addition of industrial wall tile and glass fiber wastes into epoxy resin. This process not only reduces the production cost, but also helps to eliminate solid wastes. The detailed characterization of waste particulate fillers was performed by scanning electron microscopy, X‐ray diffraction, X‐ray fluorescence, laser diffraction, and He gas picnometer techniques. The effects of the ceramic particulates to glass fiber ratio and the particle size of the waste materials on the physical and mechanical properties were determined with a fixed polymer to filler ratio of 40:60. The density, three point bending strength, impact resistance and hardness of the hybrid composites were measured. The results indicated that when the filler particle size increased, the bulk density almost remained unchanged, and the bending strength and impact resistance decreased, while the hardness and flexural modulus were almost constant. Because of the weak matrix‐reinforcement interphase, mechanical properties deteriorated with the increasing amount of waste glass fiber and better mechanical properties were achieved with the use of finer particles. As a result of incorporation of industrial wastes such as ground ceramic wall tile and glass fiber instead of expensive fillers, low cost reinforcement of the hybrid epoxy matrix composites was achieved. POLYM. COMPOS., 39:4080–4093, 2018. © 2017 Society of Plastics Engineers

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Hybrid and Hierarchical Composite Materials

Cited by 24 publications

References 567 publications

Two-scale, non-local diffusion in homogenised heterogeneous media

Two-scale, non-local diffusion in homogenised heterogeneous media

Driving macro-scale transformations in three-dimensional-printed biopolymers through controlled induction of molecular anisotropy at the nanoscale

Production and characterization of a hybrid polymer matrix composite

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