Annealing Effects of Multidirectional Oscillatory Shear in Model Glass Formers

Krishnan, Vishnu V.; Ramola, Kabir; Karmakar, Smarajit

doi:10.1103/physrevapplied.19.024004

Cited by 4 publications

(5 citation statements)

References 40 publications

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“…This similarity with oscillatory shearing suggests that activity with finite persistence time can be thought of as localized shearing rather than merely an effective temperature. The random "tumble" following the persistence time perhaps aligns even more closely with multidirectional oscillatory shearing, where the shear direction is switched randomly after each cycle [31]. We discovered that the yielded part of the curves could account for how fluidization in tissues and other biological matter might set in due to internal activity.…”

Section: Discussionmentioning

confidence: 77%

“…The fact that activity can anneal glasses effectively merits to be stated separately from the context of yielding. It could also be thought of as a stand-alone method for annealing, alongside techniques like Physical Vapour Deposition (PVD) [26], swap Monte Carlo [27], in-silico vapour deposition [28], and, of course, annealing via oscillatory shearing [29][30][31]. We previously alluded to these annealing effects of activity in our work dealing with the formation of cavities in glasses [32].…”

Section: Introductionmentioning

confidence: 99%

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Activity-Induced Annealing leads to Ductile-to-Brittle Transition in Amorphous Solids

Karmakar,

Sharma

2024

Preprint

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Active glasses are dense and disordered systems consisting of motile particles, capturing the phenomenology observed in many biological systems. We investigate motility-driven annealing and fluidization in these systems, offering new perspectives on cellular ageing and maturation. Our study establishes a correspondence between the yielding behavior of glassy systems under active dynamics and their yielding under oscillatory shear, revealing strikingly similar phase diagrams with areas of annealing and fluidization. The yielded region of the phase diagram may correlate with tissue fluidization, while the annealing region may explain age-related maturation and stiffening. This suggests that some mechanical changes observed in ageing tissues may partially stem from processes analogous to enhanced ageing observed in active glasses. Furthermore, by studying the mechanical response to tension in such systems, we establish that the degree of annealing alone cannot elicit a brittle response; the sample's geometry, particularly its ability to accommodate a shear band, is crucial. Thus, one must consider the embedding geometry for a complete picture of yielding and mechanical response in biological matter. Additionally, we explore the interplay between imposed and internal time scales in active glasses, shedding light on their complex mechanical responses.

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Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Activity-Induced Annealing leads to Ductile-to-Brittle Transition in Amorphous Solids

Karmakar,

Sharma

2024

Preprint

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“…Or, it can be due to the formation of a cavity. We observe that for smaller γ max , the system eventually reaches a limit cycle [37,[39][40][41] where either the energy decreases to a constant value or oscillates between two or more different values. Examples of limit cycles with a period greater than one are shown in the Supplementary Information.…”

Section: Energeticsmentioning

confidence: 85%

“…In Ref. [37], it has been shown that cyclic shear along multiple orthogonal directions can lead to better annealing than cyclic shear along a single direction. Here, we are able to show that if various different types of deformation, i.e.…”

Section: Energeticsmentioning

confidence: 99%

Cavitation instabilities in amorphous solids via secondary mechanical perturbations

Dattani¹,

Sharma²,

Karmakar³

et al. 2023

Preprint

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Amorphous solids are known to fail catastrophically and in some situations, nano-scaled cavities are believed to play a significant role in the failure. In a recent work, using numerical simulations, we have shown the correspondence between cavitation under uniform expansion of amorphous solids and the yielding under shear. In this study, we probe the stability of spatially-homogeneous states sampled from expansion trajectories to alternate modes of driving, viz. macroscopic cyclic shear or local random deformation via activity. We find that, under cyclic shear and activity, the cavitation instabilities can occur in expanded states at much higher densities than under pure uniform-expansion, and the shift in density is determined by the magnitude of the secondary deformation. We also show that barriers to cavitation on the energy landscape are much smaller for cyclic-shear and activity than seen under expansion. Further, we also analyse the spatial manifestation of cavitation and investigate whether large scale irreversible plasticity can set in due to the combination of expansion and the secondary deformation. Overall, our study reveals the interplay between expansion and other deformation modes leading to cavitation instabilities and the existence of abundant relaxation pathways for such processes.

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“…By contrast, periodic shear deformation in combination with thermal noise facilitate collective, irreversible rearrangements of atoms and prolonged structural relaxation [39,40]. In addition, lower energy states can be accessed when cyclic shear is periodically alternated along two or three mutually perpendicular planes [30,43]. Moreover, the range of energy states attainable in thermal glasses during low-amplitude loading can be extended by increasing strain amplitude slightly above a critical point every few cycles [36].…”

Section: Introductionmentioning

confidence: 99%

Mechanical annealing and yielding transition in cyclically sheared binary glasses

Priezjev

2022

Journal of Non-Crystalline Solids

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Annealing Effects of Multidirectional Oscillatory Shear in Model Glass Formers

Cited by 4 publications

References 40 publications

Activity-Induced Annealing leads to Ductile-to-Brittle Transition in Amorphous Solids

Activity-Induced Annealing leads to Ductile-to-Brittle Transition in Amorphous Solids

Cavitation instabilities in amorphous solids via secondary mechanical perturbations

Mechanical annealing and yielding transition in cyclically sheared binary glasses

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