Mechanical modeling of strain rate-dependent behavior of shear-stiffening gel

Kim, Jinsu; Kim, Yeonsong; Shin, Heonjung; Yu, Woong‐Ryeol

doi:10.1007/s10999-022-09618-5

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…At the lowest strain rate (0.1% s −1 ), no change in the tangent modulus at high strain was apparent but, from 0.3% s −1 , it increased with strain rate, saturating for rates above 2% s −1 , a behaviour known as shear-stiffening ( Fig. S4e , f) [27, 28, 29, 30].…”

Section: Resultsmentioning

confidence: 99%

Rupture Strength of Living Cell Monolayers

Duque

Bonfanti

Fouchard

et al. 2023

Preprint

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The ability of tissues to sustain mechanical stress and avoid fracture is a fundamental pillar of their function. Fracture in response to physiological levels of stress can be undesired, for example resulting from disease or genetic mutations, or be an integral part of developmental processes, such as during blastocoel formation in mouse or during leg eversion in flies. Despite its importance, we know very little about fracture in cellularised tissues because it is a multi-scale process that necessitates comprehension of the interplay between mechanical forces and processes at the molecular and cellular scales. Using a combination of mechanical measurements, live imaging and computational modelling, we characterise fracture in epithelial monolayers. We show that, despite consisting of only a single layer of cells, monolayers can withstand surprisingly large deformations, often accommodating several-fold increases in their length before rupture. To protect against large deformation, epithelia increase their stiffness multiple-fold in a process controlled by keratin intermediate filaments. Perturbing keratin organisation fragilised monolayers and prevented strain stiffening. Using computational approaches, we show that, although the kinetics of bond rupture ultimately control fracture, tissue rheology and the history of deformation prior to failure set the strain and stress that the tissue reaches at the onset of fracture. Our data paint a picture of epithelia as versatile materials that combine resistance to shocks with deformability when subjected to low strain rates.

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Section: Resultsmentioning

confidence: 99%

Rupture Strength of Living Cell Monolayers

Duque

Bonfanti

Fouchard

et al. 2023

Preprint

View full text Add to dashboard Cite

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Enhanced Mechanical‐Magnetic Coupling and Bioinspired Structural Design of Magnetorheological Elastomers

Wang,

Zhao,

Yang

et al. 2024

Adv Funct Materials

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Magnetorheological elastomers (MREs) are innovative materials composed of ferromagnetic particles embedded within a polymer matrix, enabling real‐time tunability of mechanical properties through external magnetic fields, thereby generating pronounced mechanical‐magnetic coupling effects. However, the mechanical performance of MREs, particularly their load‐bearing capacities under dynamic conditions, remains constrained by the limitations of conventional matrix materials. In this study, shear‐stiffening gel (SSG), exhibiting viscoelastic mechanical behavior, is incorporated into magnetorheological elastomers to develop magnetorheological shear‐stiffening elastomer (MSSE) through a high‐temperature and high‐pressure vulcanization process. The mechanical‐magnetic coupling behavior of these composites is systematically evaluated utilizing a series of mechanical experiments across varying strain rates. Notably, the interaction between carbonyl iron particles (CIPs) and the molecular chains within the shear‐stiffening matrix significantly enhanced the magnetorheological effects of MSSEs, particularly under dynamic impact loadings. Leveraging the adjustable modulus of MSSEs and drawing inspiration from the microstructural characteristics of beetle exoskeletons, a beam‐structured 3D buffer device is designed. This device demonstrates superior energy absorption capacity, underscoring its potential for advanced flexible protection applications.

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A mechanically adaptive polymer based triboelectric nanogenerator for long-life self-powered wearable electronics

Wang

et al. 2023

European Polymer Journal

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Mechanical modeling of strain rate-dependent behavior of shear-stiffening gel

Cited by 5 publications

References 41 publications

Rupture Strength of Living Cell Monolayers

Rupture Strength of Living Cell Monolayers

Enhanced Mechanical‐Magnetic Coupling and Bioinspired Structural Design of Magnetorheological Elastomers

A mechanically adaptive polymer based triboelectric nanogenerator for long-life self-powered wearable electronics

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