The micromechanics of biological and biomimetic staggered composites

Bekah, Sacheen; Rabiei, Reza; Barthelat, François

doi:10.1016/s1672-6529(11)60145-5

Cited by 27 publications

(22 citation statements)

References 52 publications

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“…This suggests that a lower composite strength (in addition to toughness) is also realized when introducing randomness into the brick sizes, and the well-known strength enhancement due to shear transfer [25,26,31,37,38] between bricks is diminished as uneven and random overlaps are distributed throughout the composite. This trend is also in good agreement with the strength simulation results of Bekah et al [35], which also implemented stochastic microstructures.…”

Section: Damage Zone and Stressessupporting

confidence: 90%

“…Their results indicated important differences in composite stress-strain response of a microstructure with statistical variations when compared to that of a 'perfect' microstructure, and they are in excellent agreement with experiment [18]. In the work of Bekah et al, the authors also implemented statistics within the microstructure by introducing a random variation in tablet length and offset [35]; the results indicated a reduction in both strength and work to failure as a result of the variation. Moreover recently, statistical strength predictions in scaffolded ceramic structures (analogous to natural nacre) have begun to emerge [30]; these calculations have enabled predictions of strength probability distributions in periodic materials, and can be generalized for arbitrary geometry and loading.…”

Section: Introductionmentioning

confidence: 60%

“…Previous analyses of the impact of heterogeneous brick arrangements on uni-axial behavior have provided insights that are relevant to the present explicit study of fracture toughness. These works defined representative volume elements (RVEs) of brick arrangements within finite element models with embedded cohesive zones [18,35]. For example, Barthelat et al studied the effect of statistical size and shape distributions in the microstructure using a large RVE containing several hundreds of tablets generated via Voronoi tiling.…”

Section: Introductionmentioning

confidence: 99%

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The impact of stochastic microstructures on the macroscopic fracture properties of brick and mortar composites

Pro

Lim

Petzold

et al. 2015

Extreme Mechanics Letters

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This paper examines the effect of non-uniform microstructures on the macroscopic fracture properties of idealized brick and mortar composites, which consist of rigid bricks bonded with elasticplastic mortar that ruptures at finite strain. A simulation tool that harnesses the parallel processing power of graphics processing units (GPUs) was used to simulate fracture in virtual specimens, whose microstructures were generated by sampling a probability distribution of brick sizes. In the simulations, crack advance is a natural outcome of local ruptures in the cohesive zones bonding the bricks: the macroscopic initiation toughness for small-scale yielding is inferred by correlating the critical load needed to advance a pre-defined crack with an associated far-field energy release rate. Quantitative connections between the statistical parameters defining heterogeneous brick distributions and the statistics of initiation toughness are presented. The nature of crack tip damage and stresses ahead of the crack tip are illustrated as a function of brick size variability. The results offer

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Section: Damage Zone and Stressessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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The impact of stochastic microstructures on the macroscopic fracture properties of brick and mortar composites

Pro

Lim

Petzold

et al. 2015

Extreme Mechanics Letters

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“…Similar models have been developed for characterising the failure of nacre by Bekah et al. 114 and for aligned discontinuous fibre composites by Pimenta et al. 115…”

Section: Modelling Of Ros and Ros-hybridsmentioning

confidence: 97%

Mechanical characterisation and modelling of randomly oriented strand architecture and their hybrids – A general review

Visweswaraiah

Selezneva

Lessard

et al. 2018

Journal of Reinforced Plastics and Composites

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A comprehensive review of the mechanical characterisation and modelling of randomly oriented strand material architecture and their hybrids with laminates is presented. Randomly oriented strand composites are long discontinuous fibre systems that exhibit excellent formability characteristics and stiffness properties comparable to quasi-isotropic laminates, allowing their use in the manufacture of intricate geometric parts for automotive and aerospace industries. Randomly oriented strand architecture complements out-of-autoclave methods such as compression moulding, thermostamping and resin-transfer moulding leading to cost-reduction. Their applicability is limited to non-structural and low-load bearing applications due to their low strength properties. Continuous fibre aerospace preforms exhibiting excellent mechanical performance possess low formability characteristics and are confined to simple shell-like geometries with minimal curvatures, while incurring high-costs and long manufacturing times. Hybridisation of randomly oriented strand and with other material architectures represents trade-off solutions of formability and performance characteristics often yielding synergistic effects. Seemingly simple, randomly oriented strand architecture is a complex material system that poses several structural and process challenges. This work categorises the pertinent research work from the literature on the mechanical characterisation into the framework of a formal characterisation environment of composite structures that includes the coupon, the part and structural levels. The manufacturing, dispersion methods and measurement techniques are qualitatively assessed with reference to the mechanical properties. The discussion on modelling involves the identification of crucial characteristics of significant analytical and numerical modelling techniques devised for the prediction of the mechanical behaviour of randomly oriented strand composites and their hybrids. Emphasis is on the methods of stiffness and strength prediction. Our perspectives on the effective use of randomly oriented strand composites and their hybrids are discussed. Process characterisation and process modelling of randomly oriented strand composites and their hybrids are beyond the scope of this article.

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“…An extensive body of research exists investigating the biomineralization and biomechanical properties of mollusc shells . An outcome of this research is the appreciation of how biological systems can take a simple, brittle mineral, and transform it into a robust composite many times stronger and tougher than the constituent ceramic phase through the simple inclusion of an organic phase and manipulation of the multi‐component geometry.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis as a Method to Study Molluscan Shell Mechanics

Lemanis

Zlotnikov

2017

Adv Eng Mater

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The clade Mollusca is a highly diverse and disparate group of terrestrial and aquatic invertebrates, the taxon containing over 100 000 known species including some of the most intelligent invertebrate animals. Their shells are exemplar systems in the study of biomechanics, biomineralization, and biomimetics. Research into understanding the superior biomechanical properties of the shell and how these properties relate to the animals ecology have required a diverse range of methods at multiple length scales; one particularly powerful method is finite element analysis. Finite element analysis is a robust engineering method that has a long-standing history in biomechanical research. This review summarizes the application of finite element analysis in the study of both the mechanical properties of different molluscan shell ultrastructures as well as macro-scale modeling of the shell. From the calculation of elastic constants to the origins of the strength of nacre and the relationship between shell folding and ecology, this article provides a window into how finite element analysis can further our understanding of mechanics and functional morphology.

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The micromechanics of biological and biomimetic staggered composites

Cited by 27 publications

References 52 publications

The impact of stochastic microstructures on the macroscopic fracture properties of brick and mortar composites

The impact of stochastic microstructures on the macroscopic fracture properties of brick and mortar composites

Mechanical characterisation and modelling of randomly oriented strand architecture and their hybrids – A general review

Finite Element Analysis as a Method to Study Molluscan Shell Mechanics

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