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Spatially heterogeneous relaxational dynamics and the evolution of recoverable strain following flow cessation of a ductile nanocolloidal glass
Chloe W. Lindeman, James J. Griebler, Penelope Grace Kovakas, Miaoqi Chu, Qingteng Zhang, Suresh Narayanan, James L. Harden, Simon A. Rogers, Robert L. Leheny
https://arxiv.org/abs/2608.11470 https://arxiv.org/pdf/2608.11470 https://arxiv.org/html/2608.11470
arXiv:2608.11470v1 Announce Type: new
Abstract: We report a combined rheology and x-ray photon correlation spectroscopy (XPCS) study of the structural and mechanical relaxation of a ductile, nanocolloidal glass following the cessation of shear flow. After the glass is sheared to 300% strain at various shear rates and then held at fixed strain, the stress undergoes a protracted, quasi-logarithmic decay with hold time that depends weakly on the initial strain rate. Recovery rheology measurements reveal that this stress relaxation is accompanied by a logarithmic decrease in the elastic component of the recoverable strain; hence, the rates of decrease of the stress and recoverable strain are proportional. XPCS measurements during the stress relaxation reveal dynamics dominated by a convection-like backflow that is divided into two dynamically distinct regions indicative of banded motion. In one region, the flow can be modeled by an affine strain, while in the other region the glass moves as a plug while undergoing slow, glassy relaxation. The rates of these dynamics approximately track the rate of loss of recoverable strain, indicating this motion is the predominant microscopic mechanism driving the conversion of recoverable to unrecoverable strain during stress relaxation. In contrast, XPCS measurements during strain recovery reveal purely affine flow with no evidence of heterogeneity and with strain rates that agree quantitatively with the rheometry measurements. Together, these results provide a unified microscopic picture connecting the evolving internal dynamics of a ductile glass to its macroscopic mechanical relaxation following flow cessation.
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Before you leave for the weekend, check out today's Metacurity for a rundown of the varied reactions to Trump's private cyber offensive memo, along with the other critical infosec developments you should know, including
-- AI agents go to war with each other,
-- Apple warns users of mercenary spyware attacks,
-- Litigant hides AI prompt injection in court filing,
-- UK transplant patients’ data sent over unencrypted pagers,
-- Trezor breach exposes nearly 14,000 customers,
-- Cl0p claims data theft from nearly 50 companies,
-- Flock’s privacy reforms fail to quiet critics,
-- Insider gets two years for $2.5 million extortion plot,
-- Akira ransomware attack sabotages itself,
-- Chinese espionage hackers moonlight in crypto fraud,
-- RingCentral breach exposes 1.6 million people,
-- Ukraine shuts down 94 scam call centers,
-- Attackers pounce on GeoServer zero-day,
-- TuLotero hack exposes IDs and selfies of 100,000 users,
-- South Korean lawmaker pushes back on Coupang criticism,
-- OpenAI reckons with security culture after Hugging Face hack,
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-- Pope Leo talks AI with US lawmakers,
-- Chinese competition drives down US AI prices,
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https://www.metacurity.com/trumps-private-cyber-offensive-wins-support-and-plenty-of-alarm/

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Check out today's Metacurity, which cuts through the clutter left by the endless buzzsaw of cyber news to deliver the critical infosec developments you should know, including
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--Analog Devices probes ExfilSquad breach claim,
--UK report blames systemic failures for Afghan data leak,
--Senators urge Apple to shun Chinese memory chips,
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--Kremlin hackers hijack Bluesky accounts for disinformation,
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--KT fined $37m over customer data breach,
--Flying Eagle powers mobile malware-as-a-service,
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--CISA updates minimum SBOM requirements,
--ChatGPT, Roblox face tougher EU oversight,
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