An elasto-viscoplastic interface model for investigating the constitutive behavior of nacre

Tang, Haochun; Barthelat, François; Espinosa, Horacio D.

doi:10.1016/j.jmps.2006.12.009

Cited by 88 publications

(61 citation statements)

References 28 publications

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“…For the first time, we quantify tablet sliding with nanometre resolution by combining in situ atomic force microscopy (AFM) fracture experiments with kinematic displacement field analysis by digital image correlation (DIC). This analysis highlights the effect of tablet interfacial hardening by revealing transverse expansion at the tablet interfaces (negative Poisson effect), a direct result of compressive stresses generated during tablet sliding-induced interfacial hardening 16,17 . On the basis of our investigation of natural nacre, we develop a model synthetic composite specifically incorporating natural nacre's critical tablet sliding and interfacial hardening mechanism (see Supplementary Movie 1).…”

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confidence: 80%

Tablet-level origin of toughening in abalone shells and translation to synthetic composite materials

et al. 2011

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Nacre, the iridescent material in seashells, is one of many natural materials employing hierarchical structures to achieve high strength and toughness from relatively weak constituents. Incorporating these structures into composites is appealing as conventional engineering materials often sacrifice strength to improve toughness. Researchers hypothesize that nacre's toughness originates within its brick-and-mortar-like microstructure. Under loading, bricks slide relative to each other, propagating inelastic deformation over millimeter length scales. This leads to orders-of-magnitude increase in toughness. Here, we use in situ atomic force microscopy fracture experiments and digital image correlation to quantitatively prove that brick morphology (waviness) leads to transverse dilation and subsequent interfacial hardening during sliding, a previously hypothesized dominant toughening mechanism in nacre. By replicating this mechanism in a scaled-up model synthetic material, we find that it indeed leads to major improvements in energy dissipation. Ultimately, lessons from this investigation may be key to realizing the immense potential of widely pursued nanocomposites.

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confidence: 80%

Tablet-level origin of toughening in abalone shells and translation to synthetic composite materials

et al. 2011

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“…Owing to its outstanding mechanical performances, nacre (or the mother-ofpearl)-the pearly inner layer and protective armour of many mollusc shells-has received extensive interest [23][24][25][26][27][28][29][30]. Nacre consists of about 95 vol% inorganic aragonite platelets and about 5 vol% protein-rich organic phase, arranged into a staggered 'brick-and-mortar' architecture [23,26].…”

Section: Introductionmentioning

confidence: 99%

On flaw tolerance of nacre: a theoretical study

Shao

Zhao

Feng

2014

J. R. Soc. Interface.

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As a natural composite, nacre has an elegant staggered 'brick-and-mortar' microstructure consisting of mineral platelets glued by organic macromolecules, which endows the material with superior mechanical properties to achieve its biological functions. In this paper, a microstructure-based crack-bridging model is employed to investigate how the strength of nacre is affected by preexisting structural defects. Our analysis demonstrates that owing to its special microstructure and the toughening effect of platelets, nacre has a superior flaw-tolerance feature. The maximal crack size that does not evidently reduce the tensile strength of nacre is up to tens of micrometres, about three orders higher than that of pure aragonite. Through dimensional analysis, a nondimensional parameter is proposed to quantify the flaw-tolerance ability of nacreous materials in a wide range of structural parameters. This study provides us some inspirations for optimal design of advanced biomimetic composites.

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“…Existing modelling approaches focus on the understanding of the exact kinematics and force distributions at the micro-scale [10,13,16,18,19]. For an engineering approach, the focus is to use novel concepts which ultimately lead to load and damage redistribution in a quasi-static or dynamic condition.…”

Section: Introductionmentioning

confidence: 99%

Biologically inspired crack delocalization in a high strain-rate environment

Knipprath

Bond

Trask

2011

J. R. Soc. Interface.

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Biological materials possess unique and desirable energy-absorbing mechanisms and structural characteristics worthy of consideration by engineers. For example, high levels of energy dissipation at low strain rates via triggering of crack delocalization combined with interfacial hardening by platelet interlocking are observed in brittle materials such as nacre, the iridescent material in seashells. Such behaviours find no analogy in current engineering materials. The potential to mimic such toughening mechanisms on different length scales now exists, but the question concerning their suitability under dynamic loading conditions and whether these mechanisms retain their energy-absorbing potential is unclear. This paper investigates the kinematic behaviour of an 'engineered' nacre-like structure within a high strain-rate environment. A finite-element (FE) model was developed which incorporates the pertinent biological design features. A parametric study was carried out focusing on (i) the use of an overlapping discontinuous tile arrangement for crack delocalization and (ii) application of tile waviness (interfacial hardening) for improved post-damage behaviour. With respect to the material properties, the model allows the permutation and combination of a variety of different material datasets. The advantage of such a discontinuous material shows notable improvements in sustaining high strain-rate deformation relative to an equivalent continuous morphology. In the case of the continuous material, the shockwaves propagating through the material lead to localized failure while complex shockwave patterns are observed in the discontinuous flat tile arrangement, arising from platelet interlocking. The influence of the matrix properties on impact performance is investigated by varying the dominant material parameters. The results indicate a deceleration of the impactor velocity, thus delaying back face nodal displacement. A final series of FE models considered the identification of an optimized configuration as a function of tile waviness and matrix properties. In the combined model, the optimized configuration was capable of stopping the ballistic threat, thus indicating the potential for bioinspired toughened synthetic systems to defeat high strain-rate threats.

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An elasto-viscoplastic interface model for investigating the constitutive behavior of nacre

Cited by 88 publications

References 28 publications

Tablet-level origin of toughening in abalone shells and translation to synthetic composite materials

Tablet-level origin of toughening in abalone shells and translation to synthetic composite materials

On flaw tolerance of nacre: a theoretical study

Biologically inspired crack delocalization in a high strain-rate environment

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