Micromechanical models to guide the development of synthetic ‘brick and mortar’ composites

Begley, Matthew R.; Philips, Noah; Compton, Brett G.; Wilbrink, David V.; Ritchie, Robert O.; Utz, Marcel

doi:10.1016/j.jmps.2012.03.002

Cited by 188 publications

(148 citation statements)

References 30 publications

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“…Figure 13 also shows that the models with higher area fraction of pillars have higher inelastic deformation. Analytical studies by Begley et al [60] on a brick and mortar structure show that increasing the mortar strength will increase the ultimate strength of the material [60]. Increasing the area fraction of shear pillars has a similar effect on ultimate strength, as strengthening the mortar part in brick and mortar structure, which causes higher strength for the multilayered materials with a similar aspect ratio of platelets.…”

Section: Toughening Mechanism and The Role Of The Componentsmentioning

confidence: 99%

“…Analytical solutions for a brick and mortar structure show that samples with higher platelets' aspect ratios generally have higher strength [60].…”

Section: Toughening Mechanism and The Role Of The Componentsmentioning

confidence: 99%

“…In that study, the uniaxial response of the brick and mortar composites was analysed and the role of different parameters such as the bricks' aspect ratio and the volume percentage of the mortar part were investigated. The proposed analytical model by Begley et al [60] is used here to validate some of the results.…”

Section: Introductionmentioning

confidence: 97%

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Toughening mechanisms in bioinspired multilayered materials

Askarinejad

Rahbar

2015

J. R. Soc. Interface.

125

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Outstanding mechanical properties of biological multilayered materials are strongly influenced by nanoscale features in their structure. In this study, mechanical behaviour and toughening mechanisms of abalone nacre-inspired multilayered materials are explored. In nacre's structure, the organic matrix, pillars and the roughness of the aragonite platelets play important roles in its overall mechanical performance. A micromechanical model for multilayered biological materials is proposed to simulate their mechanical deformation and toughening mechanisms. The fundamental hypothesis of the model is the inclusion of nanoscale pillars with near theoretical strength (s th E/30). It is also assumed that pillars and asperities confine the organic matrix to the proximity of the platelets, and, hence, increase their stiffness, since it has been previously shown that the organic matrix behaves more stiffly in the proximity of mineral platelets. The modelling results are in excellent agreement with the available experimental data for abalone nacre. The results demonstrate that the aragonite platelets, pillars and organic matrix synergistically affect the stiffness of nacre, and the pillars significantly contribute to the mechanical performance of nacre. It is also shown that the roughness induced interactions between the organic matrix and aragonite platelet, represented in the model by asperity elements, play a key role in strength and toughness of abalone nacre. The highly nonlinear behaviour of the proposed multilayered material is the result of distributed deformation in the nacre-like structure due to the existence of nano-asperities and nanopillars with near theoretical strength. Finally, tensile toughness is studied as a function of the components in the microstructure of nacre.

show abstract

Section: Toughening Mechanism and The Role Of The Componentsmentioning

confidence: 99%

“…Analytical solutions for a brick and mortar structure show that samples with higher platelets' aspect ratios generally have higher strength [60].…”

Section: Toughening Mechanism and The Role Of The Componentsmentioning

confidence: 99%

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Toughening mechanisms in bioinspired multilayered materials

Askarinejad

Rahbar

2015

J. R. Soc. Interface.

125

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“…Modeling by Begley and co-workers [53,54] suggests that further improvements are possible. In theory, with a mortar yield strength of 50 MPa, ceramic bricks measuring ≈20 × 1 µm with a strength of ≈1 GPa, and interfacial sliding displacements of ≈75 nm, a twofold increase in strength and toughness should be achievable.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Freeze Casting for Assembling Bioinspired Structural Materials

2017

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Nature is very successful in designing strong and tough, lightweight materials. Examples include seashells, bone, teeth, fish scales, wood, bamboo, silk, and many others. A distinctive feature of all these materials is that their properties are far superior to those of their constituent phases. Many of these natural materials are lamellar or layered in nature. With its “brick and mortar” structure, nacre is an example of a layered material that exhibits extraordinary physical properties. Finding inspiration in living organisms to create bioinspired materials is the subject of intensive research. Several processing techniques have been proposed to design materials mimicking natural materials, such as layer‐by‐layer deposition, self‐assembly, electrophoretic deposition, hydrogel casting, doctor blading, and many others. Freeze casting, also known as ice‐templating, is a technique that has received considerable attention in recent years to produce bioinspired bulk materials. Here, recent advances in the freeze‐casting technique are reviewed for fabricating lamellar scaffolds by assembling different dimensional building blocks, including nanoparticles, polymer chains, nanofibers, and nanosheets. These lamellar scaffolds are often infiltrated by a second phase, typically a soft polymer matrix, a hard ceramic matrix, or a metal matrix. The unique architecture of the resultant bioinspired structural materials displays excellent mechanical properties. The challenges of the current research in using the freeze‐casting technique to create materials large enough to be useful are also discussed, and the technique's promise for fabricating high‐performance nacre‐inspired structural materials in the future is reviewed.

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“…With the assumption of uniform shear stress distribution, a critical platelet aspect ratio was reported that distinguishes the platelet versus matrix failures. Begley et al 19 lifted the assumption of uniform shear stress and introduced different failure mechanisms for composites with a plastic matrix and uniform distribution of identical platelets. More recent studies proposed characteristic overlap lengths for elastic and plastic composites with uniform distribution of identical platelets 20 .…”

mentioning

confidence: 99%

Universal composition–structure–property maps for natural and biomimetic platelet–matrix composites and stacked heterostructures

Sakhavand

Shahsavari

2015

Nat Commun

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Many natural and biomimetic platelet-matrix composites-such as nacre, silk, and clay-polymer-exhibit a remarkable balance of strength, toughness and/or stiffness, which call for a universal measure to quantify this outstanding feature given the structure and material characteristics of the constituents. Analogously, there is an urgent need to quantify the mechanics of emerging electronic and photonic systems such as stacked heterostructures. Here we report the development of a unified framework to construct universal composition-structure-property diagrams that decode the interplay between various geometries and inherent material features in both platelet-matrix composites and stacked heterostructures. We study the effects of elastic and elastic-perfectly plastic matrices, overlap offset ratio and the competing mechanisms of platelet versus matrix failures. Validated by several 3D-printed specimens and a wide range of natural and synthetic materials across scales, the proposed universally valid diagrams have important implications for science-based engineering of numerous platelet-matrix composites and stacked heterostructures.

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Micromechanical models to guide the development of synthetic ‘brick and mortar’ composites

Cited by 188 publications

References 30 publications

Toughening mechanisms in bioinspired multilayered materials

Toughening mechanisms in bioinspired multilayered materials

Freeze Casting for Assembling Bioinspired Structural Materials

Universal composition–structure–property maps for natural and biomimetic platelet–matrix composites and stacked heterostructures

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