Rheologica Acta最新文献

{"title":"Correction to: Multi-variable implicit viscosity model for shear-thinning fluids","authors":"Mohammad Amin Ghorbani, Mohammad Pourhosseinian, Florian Arthofer, Silke Koch, Christian Marschik, Daniela Misul, Bahram Haddadi","doi":"10.1007/s00397-026-01564-9","DOIUrl":"10.1007/s00397-026-01564-9","url":null,"abstract":"","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 4","pages":"337 - 339"},"PeriodicalIF":3.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01564-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantifying the influence of temperature and water-to-cement ratio on cement paste rheological properties","authors":"Amalia Ioannou,&nbsp;Pavlos S. Stephanou","doi":"10.1007/s00397-026-01557-8","DOIUrl":"10.1007/s00397-026-01557-8","url":null,"abstract":"<div>\u0000 \u0000 <p>The rheological behavior of cement pastes is highly affected by temperature and water content, which hinders our capacity to build effectively in extreme conditions. We herein employ a recently proposed constitutive rheological model (Ioannou and Stephanou, J Rheol 67:849–861, 2023), to model the rheological behavior of cement pastes over an extensive temperature and water-to-cement ratio (w/c) range. We thoroughly parametrize the model for both fresh and aged cement pastes to accommodate quantitative predictions against available literature rheological data. Our work is the first to provide reliable rheological predictions for cement pastes at various w/c ratios and temperatures. Furthermore, it employs one of very few models that can predict normal stresses, whose importance in pumping and extrusion is today only partially understood. The model is expected to be utilized in the future for modeling mortar and concrete, as well as to simulate actual flowing processes occurring in construction sites.</p>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 5","pages":"457 - 474"},"PeriodicalIF":3.0,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01557-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147727626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear and elongational rheology of recycled polypropylene-based multilayer barrier films: impact of thermomechanical reprocessing","authors":"Hissein Bechibo Adam,&nbsp;Mohamed Yousfi,&nbsp;Abderrahim Maazouz,&nbsp;Khalid Lamnawar","doi":"10.1007/s00397-026-01561-y","DOIUrl":"10.1007/s00397-026-01561-y","url":null,"abstract":"<div>\u0000 \u0000 <p>The present work investigates the impact of successive thermomechanical recycling cycles on the shear and elongation rheological properties of flexible multilayer barrier films. The main objective is to use these rheological properties as indicators to probe recycling-induced structural modifications in model multilayer films composed of polypropylene (88 wt%), ethylene–vinyl alcohol (7 wt%) as the barrier layer, and maleic anhydride-grafted polypropylene (5 wt%) as the compatibilizing tie layer. On one hand, small-amplitude oscillatory shear (SAOS) measurements reveal variations in the viscoelastic properties of the multilayer film: complex viscosity decreases up to the second recycling cycle due to PP β-scission, increases in the third recycling cycle likely due to chain crosslinking and copolymer formation between EVOH and PP-g-MA. Beyond the third cycle, a further decrease in viscosity was recorded, which may be associated with weakened interfacial adhesion and the coalescence of EVOH domains within the PP matrix. These results were further supported by morphological observations using SEM and by FTIR spectroscopy analyses. On the other hand, uniaxial extensional rheology, revealed a strong sensitivity to the competing effects of PP degradation and EVOH crosslinking. Despite the strain-softening behavior of the individual constituents, a pronounced strain-hardening response develops after multiple reprocessing cycles. Interestingly, modelling of the interfacial stress contribution highlights its decrease with increasing recycling cycles. The interfacial stress is initially higher in the multilayer film due to interface/interphase continuity and chain entanglements but progressively reduced by thermomechanical processing, owing to interfacial discontinuity and nodular morphology development in the recycled multilayers systems.</p>\u0000 <span>AbstractSection</span>\u0000 Graphical Abstract\u0000 <div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div>\u0000 \u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 5","pages":"419 - 440"},"PeriodicalIF":3.0,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147727569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Viscosity functions of shear flows for fractional Jeffreys fluids","authors":"Rattanaporn Promjariyakoon,&nbsp;Pongthep Poungthong,&nbsp;Chanyut Kolitawong,&nbsp;Alan J. Giacomin","doi":"10.1007/s00397-026-01551-0","DOIUrl":"10.1007/s00397-026-01551-0","url":null,"abstract":"<div>\u0000 \u0000 <p>In our previous work (Promjariyakoon 2025; Promjariyakoon et al. 2026), we derive exact analytical solutions for (1) steady shear viscosity, and (2) shear stress growth rheological responses of the fractional Maxwell fluid (FMF) generalized to tensor form. By <i>shear stress growth</i>, we mean the sudden inception of steady shear flow. We found good agreement with experimental observation, though this left some room for improvement. In this work, following our previous method, we improve upon the FMF by adding one more fractional derivative for retardation to get the fractional Jeffreys model (FJM), a fractional Kelvin-Voigt model arranged in series with a spring-pot. We determine (1) complex viscosity, (2) the shear stress growth viscosity function, (3) then extend these to the steady shear viscosity between the stress and the local properties of theusing Gleissle mirror relations, and (4) shear stress relaxation following cessation of steady shear flow. Our FJM exact solution improves significantly upon the FMF, agreeing well with available measurements on aqueous xanthan gum solutions, so long as the initial residual stresses in the sample are accounted for. We show that its material functions are experimentally measurable and physically interpretable quantities. Finally, we construct temperature master curves for a low-density polyethylene melt. We do so to generalize predictions of viscosity under varying temperatures. Our worked example illustrates how to use our main results.</p>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 4","pages":"389 - 408"},"PeriodicalIF":3.0,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Suspension stability of a magnetorheological fluid employing high viscosity linear polysiloxane carrier fluids: a three-year study","authors":"Young T. Choi,&nbsp;Norman M. Wereley","doi":"10.1007/s00397-026-01555-w","DOIUrl":"10.1007/s00397-026-01555-w","url":null,"abstract":"<div><p>This study investigates the long-term sedimentation stability of high-viscosity linear polysiloxane-based magnetorheological fluids (HVLP MRFs) using an automated vertical-axis inductance monitoring system (AVAIMS). While the inverse relationship between carrier fluid viscosity and sedimentation rate is theoretically established through Stokes’ law, experimental validation over multi-year timescales remains unreported, and no systematic framework exists for quantifying the relative contributions of formulation parameters to multi-boundary sedimentation stability. This work addresses this gap by tracking the sedimentation behavior of three HVLP MRF samples over an unprecedented 1095 days. Variables include particle loading (35 vol% and 45 vol%) and carrier fluid viscosity (5,000 cSt and 10,000 cSt), with a commercial MRF (LORD Corp., MRF-140CG) serving as a benchmark. The AVAIMS enables detailed characterization of three sedimentation boundaries—the mud-line, gel-line, and cake-line—extending beyond conventional mud-line tracking. The HVLP MRF with 45 vol% particle loading and 10,000 cSt carrier fluid maintained 78.0% of its original concentration zone after 1095 days, whereas the LORD MRF-140CG underwent complete stratification by day 267. Building upon this qualitative characterization, a quantitative framework was developed comprising normalized sensitivity coefficients and a novel Comprehensive Stability Index (CSI) that integrates all boundary measurements into a single metric. This analysis reveals that particle loading is approximately four times more effective than carrier fluid viscosity in achieving multi-boundary sedimentation stability, providing actionable guidelines for formulation optimization.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 3","pages":"287 - 302"},"PeriodicalIF":3.0,"publicationDate":"2026-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01555-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147558759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-variable implicit viscosity model for shear-thinning fluids","authors":"Mohammad Amin Ghorbani,&nbsp;Mohammad Pourhosseinian,&nbsp;Florian Arthofer,&nbsp;Silke Koch,&nbsp;Christian Marschik,&nbsp;Daniela Misul,&nbsp;Bahram Haddadi","doi":"10.1007/s00397-026-01556-9","DOIUrl":"10.1007/s00397-026-01556-9","url":null,"abstract":"<div>\u0000 \u0000 <p>Accurately modeling the viscosity of shear-thinning elastomer compounds is crucial for optimizing their performance in industrial applications. Classical models (Power Law, Carreau, Cross) cannot directly account for temperature, and when coupled with temperature models (Arrhenius, WLF, VTF), they become mathematically complex and computationally costly for simulations. This study introduces the Multi-Variable Implicit (MVI) viscosity model, derived using machine learning-based symbolic regression. It offers a simplified mathematical structure while maintaining high predictive accuracy. The MVI model implicitly incorporates both shear-rate and temperature dependence in a single expression, while also capturing zero-shear viscosity through a Newtonian plateau. This feature ensures numerical stability and yields physically meaningful results across a wide range of shear rates and temperatures. The model was trained on high pressure capillary-rheometer data of an elastomer (70–120 °C; 10-5000 <i>1/s</i>), corrected for entrance losses and non-Newtonian profiles, and extended with synthetic points from a Carreau-Arrhenius fit to include the low-shear plateau. On test data, MVI achieved R² = 0.99 while preserving finite zero-shear viscosity. Independent validation on different materials across wider ranges gave R² = 0.957–0.990 without retraining, confirming strong generalization. To demonstrate its practical applicability, capillary-flow CFD simulations were carried out using both the MVI and Carreau-Arrhenius models. While each gave accurate predictions of the pressure-flow response, the MVI model required less computational effort because it avoids repeated exponential calculations. These findings highlight the MVI model as a novel, efficient, and practical solution for viscosity modeling in polymer processing and other fluid flow applications.</p>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 4","pages":"317 - 335"},"PeriodicalIF":3.0,"publicationDate":"2026-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01556-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Path-independent flow characterization of model yielding pastes","authors":"Gavin J. Donley,&nbsp;Nicos Martys,&nbsp;Emanuela Del Gado,&nbsp;Kenneth Snyder","doi":"10.1007/s00397-026-01553-y","DOIUrl":"10.1007/s00397-026-01553-y","url":null,"abstract":"<div>\u0000 \u0000 <p>Yielding pastes are a class of soft materials that have the ability to mechanically transition between solid-like deformation and fluid-like flow based on the level of mechanical loading. This phenomenology, particularly when it is reversible, makes them ideal for use in additive manufacturing processes such as direct-ink-writing (DIW) 3D printing. To optimize materials for such applications, robust characterization of the flow behavior of these materials is needed. The most common means of doing this is the collection of a steady-shear flow curve, which consists of a series of constant shear rate tests across the desired deformation range, tracking the stress required for the deformation in each. The exact means by which this is accomplished, however, varies quite widely, with literature implementing tests with a variety of collection orders, preshear protocols, and end-of-test conditions. As many yielding pastes exhibit complex shear history, this variation in testing procedures creates a potential obstacle for obtaining reproducible results. To address this, we compare the flow curves of model yielding pastes as the order of measurements is changed. We also examine the impact of material conditioning on these changes by contrasting between a conventional shear-ramping preconditioning and a novel oscillatory/forced-recovery preshear. By examining the effect that the measurement collection order has on collected flow curves of multiple model yielding pastes, we determine the inclusion of an oscillatory preshear containing a forced-recovery step in-between successive measurements allows for a minimization of the path-dependence caused by material shear history.</p>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 4","pages":"341 - 352"},"PeriodicalIF":3.0,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selected contributions from the Canadian Society of Rheology Symposium, Montreal 2025","authors":"Giovanniantonio Natale,&nbsp;Nicole R. Demarquette","doi":"10.1007/s00397-026-01554-x","DOIUrl":"10.1007/s00397-026-01554-x","url":null,"abstract":"","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 3","pages":"207 - 207"},"PeriodicalIF":3.0,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147558968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on creep behavior and constitutive model of salt rock based on the spatiotemporal evolution mechanism of structure","authors":"Lele Lu,&nbsp;Haiyang Yi,&nbsp;Zhide Wu,&nbsp;Tingjin Liu,&nbsp;Mingwu Liu,&nbsp;Bingbing Liu,&nbsp;Dongjie Xue,&nbsp;Shiping Huang","doi":"10.1007/s00397-026-01549-8","DOIUrl":"10.1007/s00397-026-01549-8","url":null,"abstract":"<div><p>Under complex stress conditions, the spatiotemporal coupling between creep deformation and structural degradation of salt rock remains unclear. Traditional creep models mainly rely on macroscopic strain fitting, neglecting the intrinsic correlation between micro-damage and macroscopic structural evolution, which leads to ambiguous physical meanings, redundant parameters, and limited predictive capability. In this study, the microstructural evolution, acoustic emission response, and strain characteristics of salt rock during creep were analyzed to reveal the staged deformation mechanisms: in the initial stage, pores and microcracks gradually close; in the steady stage, microcracks independently nucleate and slowly propagate, marking the onset of new damage; and in the accelerated stage, deformation shifts from viscoelastic to instantaneous plastic compression. Accordingly, the total creep strain is decomposed into elastic, viscoelastic, and plastic compression components. Based on the fractional derivative Maxwell model, a nonlinear creep model incorporating a damage-attenuated Hookean element and a switch element was established to describe structural degradation and plastic compression. Creep tests on different types of salt rocks under various stress paths verified the model’s capability through staged parameter identification. A parameter sensitivity analysis was conducted for the plastic compressive strain model, further enhancing the convenience of model application. Based on the composition of creep strain, the strain evolution patterns of different types of salt rock under multiple stress levels were systematically analyzed, providing theoretical support for the precise characterization of time-dependent deformation and instability prediction of surrounding rocks in deep salt cavern reservoirs.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 4","pages":"369 - 388"},"PeriodicalIF":3.0,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Shear jamming and nonlinear rheology of chocolate suspensions","authors":"Michel Orsi,&nbsp;Veeraj Shah,&nbsp;Mahesh Padmanabhan,&nbsp;Thomas Curwen,&nbsp;Jeffrey F. Morris","doi":"10.1007/s00397-026-01552-z","DOIUrl":"10.1007/s00397-026-01552-z","url":null,"abstract":"","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 2","pages":"205 - 206"},"PeriodicalIF":3.0,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}