Stress relaxation ≈ Stress relaxation
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A fully bio-based epoxy vitrimer: Self-healing, triple-shape memory and reprocessing triggered by dynamic covalent bond exchange Open
Vitrimers are a new type of polymers with promising applications in innovative materials. Epoxidized soybean oil (ESO) is an ideal candidate for vitrimer preparation owing to its abundant epoxy groups. However, preparing plant oil-based vi…
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Reprocessable Cross-Linked Polymer Networks: Are Associative Exchange Mechanisms Desirable? Open
Covalent adaptable networks (CANs) are covalently cross-linked polymers that may be reshaped via cross-linking and/or strand exchange at elevated temperatures. They represent an exciting and rapidly developing frontier in polymer science f…
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Strain-enhanced stress relaxation impacts nonlinear elasticity in collagen gels Open
Significance The extracellular matrix is a complex assembly of structural proteins that provides physical support and biochemical signaling to cells within our tissues. One of the key structural components of the extracellular matrix is co…
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Adaptable Fast Relaxing Boronate‐Based Hydrogels for Probing Cell–Matrix Interactions Open
Hydrogels with tunable viscoelasticity hold promise as materials that can recapitulate many dynamic mechanical properties found in native tissues. Here, covalent adaptable boronate bonds are exploited to prepare hydrogels that exhibit fast…
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Stress Relaxation, Dynamics, and Plasticity of Transient Polymer Networks Open
We propose a theoretical framework for dealing with a transient polymer network undergoing small deformations, based on the rate of breaking and reforming of network cross-links and the evolving elastic reference state. In this framework, …
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Stress relaxation properties of four orthodontic aligner materials: A 24-hour in vitro study Open
Objective: To investigate the stress release properties of four thermoplastic materials used to make orthodontic aligners when subjected to 24 consecutive hours of deflection. Materials and Methods: Four types of aligner materials (two sin…
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Linear Viscoelasticity and Flow of Self-Assembled Vitrimers: The Case of a Polyethylene/Dioxaborolane System Open
For vitrimer systems obtained by dynamic cross-linking of polymer chains, incompatibility effects between the cross-links and polymer backbone can lead to microphase separation, resulting in a network made of cross-linked aggregates. Addit…
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Structural effects on the reprocessability and stress relaxation of crosslinked polyhydroxyurethanes Open
Crosslinked polyhydroxyurethane (PHU) networks synthesized from difunctional six‐membered cyclic carbonates and triamines are reprocessable at elevated temperatures through transcarbamoylation reactions. Here we study the structural effect…
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Human lung extracellular matrix hydrogels resemble the stiffness and viscoelasticity of native lung tissue Open
Chronic lung diseases such as idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary disease (COPD) are associated with changes in extracellular matrix (ECM) composition and abundance affecting the mechanical properties of t…
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Flow units as dynamic defects in metallic glassy materials Open
In a crystalline material, structural defects such as dislocations or twins are well defined and largely determine the mechanical and other properties of the material. For metallic glass (MG) with unique properties in the absence of a long…
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Relaxation Decoupling in Metallic Glasses at Low Temperatures Open
Upon cooling, glass-forming liquids experience a dynamic decoupling in the fast β and slow α process, which has greatly influenced glass physics. By exploring an extremely wide temporal and temperature range, we find a surprising gradual c…
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Substrate Stress‐Relaxation Regulates Scaffold Remodeling and Bone Formation In Vivo Open
The rate of stress relaxation of adhesion substrates potently regulates cell fate and function in vitro, and in this study the authors test whether it can regulate bone formation in vivo by implanting alginate gels with differing rates of …
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Measurement of cortical elasticity in <i>Drosophila melanogaster</i> embryos using ferrofluids Open
Significance A physically realistic understanding of any morphogenetic process requires the knowledge of material properties of the tissue, almost all of which we currently lack. This paper introduces a technique that allows measuring phys…
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Dynamics of Vitrimers: Defects as a Highway to Stress Relaxation Open
We propose a coarse-grained model to investigate stress relaxation in star-polymer networks induced by dynamic bond-exchange processes. We show how the swapping mechanism, once activated, allows the network to reconfigure, exploring distin…
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Nanoscale origins of creep in calcium silicate hydrates Open
The time-dependent response of structural materials dominates our aging infrastructure’s life expectancy and has important resilience implications. For calcium-silicate-hydrates, the glue of cement, nanoscale mechanisms underlying time-dep…
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Titanium Oxide (TiO2)/Polymethylmethacrylate (PMMA) Denture Base Nanocomposites: Mechanical, Viscoelastic and Antibacterial Behavior Open
Currently, polymethylmethacrylate (PMMA) is the most popular denture base material. Most fractures of dentures that occur during function are due to its insufficient mechanical strength. The major drawbacks of PMMA are insufficient ductili…
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Engineering Elasticity and Relaxation Time in Metal-Coordinate Cross-Linked Hydrogels Open
Reversible cross-links between polymer chains are a promising avenue to engineer the mechanical properties of soft materials and in particular hydrogels. Such developments are however challenged by the complexity of these materials, which …
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Extracellular matrix plasticity as a driver of cell spreading Open
Significance In many biomaterial systems, plastic deformation of extracellular matrix, degradation, or relaxation of stress are coupled and therefore their effects on cell phenotype are difficult to isolate. Using a polymer plasticizing ar…
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4D Printing‐Encapsulated Polycaprolactone–Thermoplastic Polyurethane with High Shape Memory Performances Open
There are a few shape memory polymers (SMPs) like polylactic acid (PLA) and polyurethane (PU) that are 4D printable, and other SMPs must be synthesized with a complicated chemical lab effort. Herein, considering dual‐material extrusion pri…
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Time‐Dependent Mechanical Response of APbX<sub>3</sub> (A = Cs, CH<sub>3</sub>NH<sub>3</sub>; X = I, Br) Single Crystals Open
The ease of processing hybrid organic–inorganic perovskite (HOIPs) films, belonging to a material class with composition ABX 3 , from solution and at mild temperatures promises their use in deformable technologies, including flexible photo…
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Elasticity and Relaxation in Full and Partial Vitrimer Networks Open
We develop a continuum model of the dynamic-mechanical response of vitrimers, where the elastic energy of the material accounts for the conserved number of the crosslinks in the network. We also prepare partial vitrimer networks, which con…
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Cracking potential of alkali-activated slag and fly ash concrete subjected to restrained autogenous shrinkage Open
This study aims to investigate the cracking potential of alkali-activated slag (AAS) and alkali-activated slag-fly ash (AASF) concrete subjected to restrained autogenous shrinkage. Temperature Stress Testing Machine (TSTM) is utilized, for…
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Effects of Conventional and Severe Shot Peening on Residual Stress and Fatigue Strength of Steel AISI 1060 and Residual Stress Relaxation Due to Fatigue Loading: Experimental and Numerical Simulation Open
This study investigates and compares the effects of different shot peening treatments including conventional and severe shot peening on microstructure, mechanical properties, fatigue behavior, and residual stress relaxation of AISI 1060 st…
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Rheological, fatigue and relaxation properties of aged bitumen Open
Bitumen ageing has a significant impact on the mechanical performance of asphalt concrete. This study utilises dynamic mechanical tests (frequency sweep, fatigue, and relaxation) to investigate the effect of ageing on the viscoelastic char…
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A multi-scale model for stresses, strains and swelling of reactor components under irradiation Open
Predicting strains, stresses and swelling in nuclear power plant components exposed to irradiation directly from the observed or computed defect and dislocation microstructure is a fundamental problem of fusion power plant design that has …
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Tunable hydrogel viscoelasticity modulates human neural maturation Open
Human-induced pluripotent stem cells (hiPSCs) have emerged as a promising in vitro model system for studying neurodevelopment. However, current models remain limited in their ability to incorporate tunable biomechanical signaling cues impa…
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Towards a consensus on rheological models for elastography in soft tissues Open
A rising wave of technologies and instruments are enabling more labs and clinics to make a variety of measurements related to tissue viscoelastic properties. These instruments include elastography imaging scanners, rheological shear viscom…
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The thermal stability of epitaxial GeSn layers Open
We report on the direct observation of lattice relaxation and Sn segregation of GeSn/Ge/Si heterostructures under annealing. We investigated strained and partially relaxed epi-layers with Sn content in the 5 at. %-12 at. % range. In relaxe…
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Transition from stress-driven to thermally activated stress relaxation in metallic glasses Open
The short-range ordered but long-range disordered structure of metallic glasses yields strong structural and dynamic heterogeneities. Stress relaxation is a technique to trace the evolution of stress in response to a fixed strain, which re…
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Understanding the Stress Relaxation Behavior of Polymers Reinforced with Short Elastic Fibers Open
Although it has been experimentally shown that the addition of short-fibers slows the stress relaxation process in composites, the underlying phenomenon is complex and not well understood. Previous studies have proposed that fibers slow th…