Modeling single-molecule stretching experiments using statistical thermodynamics DOI Creative Commons
Michael Buche, Jessica Rimsza

arXiv (Cornell University), Год журнала: 2023, Номер unknown

Опубликована: Янв. 1, 2023

Single-molecule stretching experiments are widely utilized within the fields of physics and chemistry to characterize mechanics individual bonds or molecules, as well chemical reactions. Analytic relations describing these valuable, can be obtained through statistical thermodynamics idealized model systems representing experiments. Since specific thermodynamic ensembles manifested by affect outcome, primarily for small device must included in system. Though stretched molecule might exactly solvable, including often prevents analytic solutions. In limit large stiffness, isometric isotensional provide effective approximations, but effects missing. Here, a dual set asymptotically correct theories applied develop accurate approximations full system that includes both device. The asymptotic first demonstrated using freely jointed chain model, then molecular dynamics calculations single polyethylene chain.

Язык: Английский

A Review on the Mullins Effect in Tough Elastomers and Gels DOI Creative Commons
Lin Zhan, Shaoxing Qu, Rui Xiao

и другие.

Acta Mechanica Solida Sinica, Год журнала: 2024, Номер 37(2), С. 181 - 214

Опубликована: Фев. 26, 2024

Abstract Tough elastomers and gels have garnered broad research interest due to their wide-ranging potential applications. However, during the loading unloading cycles, a clear stress softening behavior can be observed in many material systems, which is also named as Mullins effect. In this work, we aim provide complete review of effect soft yet tough materials, specifically focusing on nanocomposite gels, double-network hydrogels, multi-network elastomers. We first revisit experimental observations for these materials. then discuss recent developments constitutive models, emphasizing novel damage mechanisms or network representations. Some phenomenological models will briefly introduced. Particular attention placed anisotropic multiaxial modeling aspects. It demonstrated that most existing fail accurately predict data, posing significant challenge developing future tailored

Язык: Английский

Процитировано

11
Fracture Behavior of Polymers in Plastic and Elastomeric States DOI
Shi‐Qing Wang, Zehao Fan, Chaitanya Gupta

и другие.

Macromolecules, Год журнала: 2024, Номер 57(9), С. 3875 - 3900

Опубликована: Май 2, 2024

Our recent studies departed from the conventional description of polymer fracture behavior while maintaining consistency with principles material mechanics including linear elastic (LEFM). In traditional brittle materials, crack resistance is quantified in terms toughness Gc, which represents critical energy release per unit surface area. This perspective suggests that high Gc involved dissipation. A new has surfaced, proposing a fundamental yet underexplored, seemingly universal mechanism and explaining origin within an alternative framework. According to this view, for unfilled plastics elastomers, initiates when local tensile stress surpasses polymer's strength σF(inh), consequence strength. Remarkably, polymers both plastic elastomeric states, their inherent σF(inh) appears be comparable magnitude nominal σb. Spatial–temporal resolved polarized optical microscopic (str-POM) measurements have started provide insight into unveil concealed length scale (P) representing size saturation zone at tip. The two-parameter theoretical framework shows (a) increases quadratically its linearly P (b) elastomers exhibit significantly greater higher lower temperatures due increased stability covalent bonds given thermal plausible frictional effect on bond vibration frequency. Embracing emerging paradigm where we recognize time-dependent, anticipate advancements design clearer understanding polymeric materials.

Язык: Английский

Процитировано

10
A multiscale model for the multiaxial anisotropic damage of double-network gels DOI

Lionel Ogouari,

Qiang Guo, Fahmi Zaïri

и другие.

Mechanics of Materials, Год журнала: 2024, Номер 196, С. 105058 - 105058

Опубликована: Июнь 5, 2024

Язык: Английский

Процитировано

7
An anisotropic damage visco-hyperelastic model for multiaxial stress-strain response and energy dissipation in filled rubber DOI

Lionel Ogouari,

Qiang Guo, Fahmi Zaïri

и другие.

International Journal of Plasticity, Год журнала: 2024, Номер 182, С. 104111 - 104111

Опубликована: Авг. 30, 2024

Язык: Английский

Процитировано

6
Catch bond kinetics are instrumental to cohesion of fire ant rafts under load DOI Creative Commons
Robert J. Wagner, Samuel C. Lamont,

Zachary T. White

и другие.

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(17)

Опубликована: Апрель 15, 2024

Dynamic networks composed of constituents that break and reform bonds reversibly are ubiquitous in nature owing to their modular architectures enable functions like energy dissipation, self-healing, even activity. While bond breaking depends only on the current configuration attachment these networks, reattachment also proximity constituents. Therefore, dynamic macroscale (not benefited by secondary interactions cohering analogous molecular-scale constituents) must rely primary for cohesion self-repair. Toward understanding how such might adaptively achieve this, we explore uniaxial tensile response 2D rafts interlinked fire ants ( S. invicta ). Through experiments discrete numerical modeling, find ant stabilize bonded ant-to-ant strains, indicating catch dynamics. Consequently, low-strain rates should theoretically induce creep mechanics instead elastic-like response. Our results suggest this force-stabilization delays dissolution improves toughness. Nevertheless, above 35 % strain low stress localization cause nucleation growth voids whose coalescence patterns result from force-stabilization. These mitigate structural repair until initial raft densities restored can reconnect across defects. However mechanical recovery during cyclic loading suggests that—even upon reinstatement densities—ants exhibit slower kinetics if they were recently loaded at faster rates. exemplify ants’ status as active agents capable memory-driven, stimuli-response potential inspiration adaptive materials.

Язык: Английский

Процитировано

5
Finite element simulation of rate-dependent damage in elastomers DOI
Pinyi Wang, Shawn R. Lavoie, Tian Tang

и другие.

International Journal of Fracture, Год журнала: 2025, Номер 249(1)

Опубликована: Янв. 1, 2025

Процитировано

0
An anisotropic constitutive relationship by a series of 8 chain models DOI
Libin Yang, Teng Long, Lixiang Yang

и другие.

International Journal of Solids and Structures, Год журнала: 2025, Номер unknown, С. 113288 - 113288

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

0
Polyurethane Elastomer with Stable Mechanical Performance During Biodegradation: Material Design and Constitutive Modeling DOI
Zhuoran Yang, Jiaxin Shi, Yifeng Li

и другие.

Journal of the Mechanics and Physics of Solids, Год журнала: 2025, Номер unknown, С. 106145 - 106145

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Finite element implementation of a gradient-damage theory for fracture in elastomeric materials DOI Creative Commons
Jaehee Lee, Seunghyeon Lee, Shawn A. Chester

и другие.

International Journal of Solids and Structures, Год журнала: 2023, Номер 279, С. 112309 - 112309

Опубликована: Май 11, 2023

Язык: Английский

Процитировано

9
A multiscale anisotropic polymer network model coupled with phase field fracture DOI
Prajwal Kammardi Arunachala, Sina Abrari Vajari, Matthias Neuner

и другие.

International Journal for Numerical Methods in Engineering, Год журнала: 2024, Номер 125(13)

Опубликована: Апрель 5, 2024

Abstract The study of polymers has continued to gain substantial attention due their expanding range applications, spanning essential engineering fields emerging domains like stretchable electronics, soft robotics, and implantable sensors. These materials exhibit remarkable properties, primarily stemming from intricate polymer chain network, which, in turn, increases the complexity precisely modeling behavior. Especially for elastomers fracture behavior, accurately accounting deformations chains is vital predicting rupture highly stretched chains. Despite importance, many robust multiscale continuum frameworks elastomer tend simplify network by assuming uniform behavior among all directions. Recognizing this limitation, our proposes a model that accounts anisotropic nature responses. At microscale, damage assumed be driven both chain's entropy internal energy molecular bond distortions. In order bridge stretching macroscale deformation, we employ maximal advance path constraint model, inherently accommodating As result, oriented differently can predicted varying stretch and, consequently, different levels. To drive based on damages these chains, utilize micromorphic regularization theory, which involves introduction dual local‐global variables at macroscale. local variable obtained through homogenization values, resulting prediction an isotropic material response. global subjected nonlocal effects boundary conditions thermodynamically consistent phase field formulation. Moreover, total dissipation system considered mainly breaking bonds microscale. validate double‐edge notched tensile test as benchmark, comparing simulation predictions with existing experimental data. Additionally, enhance understanding fracturing process, conduct uniaxial experiments square film made up polydimethylsiloxane (PDMS) rubber embedded hole notches then compare observations. Furthermore, visualize evolution values along directions assess predictive capacity model. results are also compared another evaluate utility simulating rubber‐like materials.

Язык: Английский

Процитировано

3