Interfacial indentations in biological composites

Shelef, Yaniv; Bar‐On, Benny

doi:10.1016/j.jmbbm.2020.104209

Cited by 12 publications

(3 citation statements)

References 37 publications

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“…[7,10] Furthermore, these studies are often supported by numerical computational methods with the goal of understanding how the contribution of each individual component, their shape, properties, and spatial organization, scale up to provide these tissues with the required mechanical properties. [11][12][13][14] Nanoindentation is one of the most commonly used techniques to study the mechanical functionality of biological materials. [15] It allows for local mechanical characterization of complex composite structures with sub-micron spatial features and a large range of properties-ideal for gaining a comprehensive understanding of the performance of biological materials.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Nanoindentation at Elevated Humidities

Tadayon

Bar‐On

Günther

et al. 2023

Adv Materials Inter

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Nanoindentation is one of the most widespread methods to measure the mechanical performance of complex materials systems. As it allows for local characterization of composite architectures with sub‐micron spatial features and a large range of properties, nanoindentation is commonly used to measure the properties of biological materials. In situ nanoindentation, a further development of the approach, is a powerful tool for the analysis of plastic deformation and failure of materials. Here, samples can be mechanically manipulated using the indenter, while their behavior is monitored with the resolution of a scanning electron microscope (SEM). Indeed, numerous studies demonstrate the potential of this approach for studying the most fundamental material characteristics. However, so far, these measurements are performed in high‐vacuum conditions inherent to the conventional electron microscopy method, which are irrelevant when studying biological structures that evolved to perform in hydrated conditions. In this work, the ability to conduct nanoindentation experiments under controlled humidity and temperature inside an environmental SEM is developed. This technique has the potential to become crucial for materials design and characterization in many domains where humidity has a significant impact on performance. These include organic/polymer systems, microelectronic and optoelectronic devices, materials for catalysis, batteries, and many more.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Nanoindentation at Elevated Humidities

Tadayon

Bar‐On

Günther

et al. 2023

Adv Materials Inter

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“…Nanomechanical testing methods, e.g., nanoindentation and nanoscale dynamic mechanical analysis (DMA), are the benchmark approaches to identifying the mechanical characteristics of the interfacial regions in biocomposites [ 18 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. These methods apply local contact loadings to certain locations within the interfacial region, analyze their mechanical response upon static or harmonic forces, and determine the elastic stiffness and viscous damping characteristics of the underlying reinforcement or matrix materials within the interfacial region.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Interfacial Dynamic Modulus of Biological Composites

et al. 2021

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Biological composites (biocomposites) possess ultra-thin, irregular-shaped, energy dissipating interfacial regions that grant them crucial mechanical capabilities. Identifying the dynamic (viscoelastic) modulus of these interfacial regions is considered to be the key toward understanding the underlying structure–function relationships in various load-bearing biological materials including mollusk shells, arthropod cuticles, and plant parts. However, due to the submicron dimensions and the confined locations of these interfacial regions within the biocomposite, assessing their mechanical characteristics directly with experiments is nearly impossible. Here, we employ composite-mechanics modeling, analytical formulations, and numerical simulations to establish a theoretical framework that links the interfacial dynamic modulus of a biocomposite to the extrinsic characteristics of a larger-scale biocomposite segment. Accordingly, we introduce a methodology that enables back-calculating (via simple linear scaling) of the interfacial dynamic modulus of biocomposites from their far-field dynamic mechanical analysis. We demonstrate its usage on zigzag-shaped interfaces that are abundant in biocomposites. Our theoretical framework and methodological approach are applicable to the vast range of biocomposites in natural materials; its essence can be directly employed or generally adapted into analogous composite systems, such as architected nanocomposites, biomedical composites, and bioinspired materials.

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