Articoli di riviste: "Elasto-Visco-Plastic behavior"

1

Ewoldt, Randy H., e Gareth H. McKinley. "Mapping thixo-elasto-visco-plastic behavior". Rheologica Acta 56, n. 3 (marzo 2017): 195–210. http://dx.doi.org/10.1007/s00397-017-1001-8.

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Wan, Lin Hui, Ping Cao, Yong Heng Huang, Yi Xian Wang e Xiang Yang Zhang. "Creep Test of Hard Rock and Modified Generalized Kelvin Creep Model". Applied Mechanics and Materials 90-93 (settembre 2011): 626–32. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.626.

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By a circular increment step load and unload method, a set of rheological experiments were performed to study the creep properties of amphibolite and the deformation data of instantaneous elasticity, instantaneous plasticity, viscoplasticity and viscoelasticity could be obtained. The results showed that: the creep threshold of amphibolite(σs1) was 25.46MPa; whenσs1s2, the proportion of plastic deformation in the total deformation was very small and the value of creep deformation always tended to a stable value; whenσ>σs2, the rock samples failed rapidly and had no obvious creep. According to the creep and failure properties of amphibolite, the generalized Kelvin creep model was acted in series with the Mohr-Coulomb criterion and a modified generalized Kelvin creep model was built and the corresponding visco-elasto-plastic constitutive relationships were deduced. The modified model could simulate visco-elasto-plastic deviatoric behavior and elasto-plastic volumetric behavior. The model parameters of amphibolite were fitted according to the data of rheological test. The testing curves were coincident well with the theoretic curves by comparison which showed the creep properties and the plastic flow of hard rock could be well simulated by the generalized Kelvin creep model.

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Jeong, Youngung, e Carlos N. Tomé. "Extension of the visco-plastic self-consistent model to account for elasto-visco-plastic behavior using a perturbed visco-plastic approach". Modelling and Simulation in Materials Science and Engineering 27, n. 8 (1 ottobre 2019): 085013. http://dx.doi.org/10.1088/1361-651x/ab4b66.

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Ju, J. W., e Tsung-Muh Chen. "Micromechanics and Effective Elastoplastic Behavior of Two-Phase Metal Matrix Composites". Journal of Engineering Materials and Technology 116, n. 3 (1 luglio 1994): 310–18. http://dx.doi.org/10.1115/1.2904293.

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A micromechanical framework is presented to predict effective (overall) elasto-(visco-)plastic behavior of two-phase particle-reinforced metal matrix composites (PRMMC). In particular, the inclusion phase (particle) is assumed to be elastic and the matrix material is elasto-(visco-)plastic. Emanating from Ju and Chen’s (1994a,b) work on effective elastic properties of composites containing many randomly dispersed inhomogeneities, effective elastoplastic deformations and responses of PRMMC are estimated by means of the “effective yield criterion” derived micromechanically by considering effects due to elastic particles embedded in the elastoplastic matrix. The matrix material is elastic or plastic, depending on local stress and deformation, and obeys general plastic flow rule and hardening law. Arbitrary (general) loadings and unloadings are permitted in our framework through the elastic predictor-plastic corrector two-step operator splitting methodology. The proposed combined micromechanical and computational approach allows us to estimate overall elastoplastic responses of PRMMCs by accounting for the microstructural information (such as the spatial distribution and micro-geometry of particles), elastic properties of constituent phases, and the plastic behavior of the matrix-only materials. Comparison between our theoretical predictions and experimental data on uniaxial elastoplastic tests for PRMMCs is also presented to illustrate the capability of the proposed framework. A straightforward extension to accommodate viscoplastic matrix material is also presented to further enhance the applicability of the proposed method.

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Milašinović, Dragan D. "Rheological–dynamical analogy: visco-elasto-plastic behavior of metallic bars". International Journal of Solids and Structures 41, n. 16-17 (agosto 2004): 4599–634. http://dx.doi.org/10.1016/j.ijsolstr.2004.02.061.

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Liu, Sheng, Tong Liu, Bang Zhe Liu e Zi Chao Dong. "Numerical Simulation of Creep Deformation for Large Section Tunnel in Soil with Visco-Elastic-Plastic FEM". Advanced Materials Research 368-373 (ottobre 2011): 2500–2503. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2500.

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In order to reasonably analyze the influence of rheological properties on the soil deformation behavior of tunnel in soil, this paper establishes visco-elastic-plastic numerical calculation model for analysis of tunnel in soil deformation based on ANSYS software by relying on physical construction. The results show that creep deformation accounts for 24% of total deformation of the tunnel, so it is necessary to make visco-elasto-plastic analysis on tunnel in soil. If the numerical simulation results are basically the same with the trend of temporal curve of measured data, and the data obtained is relatively close, then the established model is correct.

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Slouf, Miroslav, Milos Steinhart, Pavel Nemecek, Veronika Gajdosova e Jiri Hodan. "Correlations between Microscale Indentation Creep and Macroscale Tensile Creep of Polymers". Materials 16, n. 2 (15 gennaio 2023): 834. http://dx.doi.org/10.3390/ma16020834.

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We compared the results of various microscale indentation creep (microcreep) measurements with macroscale tensile creep (macrocreep) measurements of three common polymers: high-density polyethylene (PE), polypropylene (PP), and polystyrene (PS). The main objective was to verify if the short-term microcreep experiments could predict long-term macrocreep behavior of the selected polymers, whose properties ranged from very soft and ductile (PE) to very hard and brittle (PS). The second objective was to compare several creep predictive schemes: the empirical power law model (PL) and several types of phenomenological elasto-visco-plastic models (EVP). In order to facilitate this task, we developed a universal program package named MCREEP, which fits PL and EVP models to both tensile and indentation creep data. All experimental results and theoretical predictions documented that: (i) regardless of the creep experiment type, both micro- and macrocreep resistance increased in the following order: PE < PP < PS, (ii) the short-term microcreep experiments could be used to predict qualitatively the long-term macrocreep behavior, and (iii) the simple empirical power law model yielded better predictions of long-term creep behavior than the more sophisticated elasto-visco-plastic models.

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Wang, Xingkai, Leibo Song, Caichu Xia, Guansheng Han e Zheming Zhu. "Nonlinear Elasto-Visco-Plastic Creep Behavior and New Creep Damage Model of Dolomitic Limestone Subjected to Cyclic Incremental Loading and Unloading". Sustainability 13, n. 22 (9 novembre 2021): 12376. http://dx.doi.org/10.3390/su132212376.

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For many rock engineering projects, the stress of surrounding rocks is constantly increasing and decreasing during excavating progress and the long-term operation stage. Herein, the triaxial creep behavior of dolomitic limestone subjected to cyclic incremental loading and unloading was probed using an advanced rock mechanics testing system (i.e., MTS815.04). Then, the instantaneous elastic strain, instantaneous plastic strain, visco-elastic strain, and visco-plastic strain components were separated from the total strain curve, and evolutions of these different types of strain with deviatoric stress increment were analyzed. Furthermore, a damage variable considering the proportion of irrecoverable plastic strain to the total strain was introduced, and a new nonlinear multi-element creep model was established by connecting the newly proposed damage viscous body in series with the Hookean substance, St. Venant body, and Kelvin element. The parameters of this new model were analyzed. The findings are listed as follows: (1) When the deviatoric stress is not more than 75% of the compressive strength, only instantaneous deformation, transient creep, and steady-state creep deformation occur, rock deformation is mainly characterized by the instantaneous strain, whereas the irrecoverable instantaneous plastic strain accounts for 38.02–60.27% of the total instantaneous strain; (2) Greater deviatoric stress corresponds to more obvious creep deformation. The visco-elastic strain increases linearly with the increase of deviatoric stress, especially the irrecoverable visco-plastic strain increases exponentially with deviatoric stress increment, and finally leads to accelerated creep and delayed failure of the sample; (3) Based on the experimental data, the proposed nonlinear creep model is verified to describe the full creep stage perfectly, particularly the tertiary creep stage. These results could deepen our understanding of the elasto-visco-plastic deformation behavior of dolomitic limestone and have theoretical and practical significance for the safe excavation and long-term stability of underground rock engineering.

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Estrada-Royval, Ignacio-Alberto, e Alberto Díaz-Díaz. "Post-curing process and visco-elasto-plastic behavior of two structural adhesives". International Journal of Adhesion and Adhesives 61 (settembre 2015): 99–111. http://dx.doi.org/10.1016/j.ijadhadh.2015.06.001.

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Pipard, Jean Marc, Tudor Balan, Farid Abed-Meraim e Xavier Lemoine. "Physically-Motivated Elasto-Visco-Plastic Model for the Large Strain-Rate Behavior of Steels". Key Engineering Materials 554-557 (giugno 2013): 1164–73. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1164.

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A physically based elasto-visco-plastic constitutive model is presented and compared to experimental results for three different mild steels. The experiments consist of tensile tests at strain rates up to 103 s-1 and reverse shear tests. The model requires significantly fewer material parameters compared to other visco-plasticity models from the literature while exhibiting very good accuracy. Accordingly, the parameter identification is simple and intuitive, requiring a relatively small set of experiments. The strain-rate sensitivity modeling is not restricted to a particular hardening law and thus provides a general framework in which advanced hardening equations can be adopted. The model was eventually used as the basis for a homogenization approach at the phase scale; preliminary investigations showed the benefit of such an approach, where microstructure-relevant data can explicitly enter the model and may be used for material design simulations.

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Drescher, Andrew, Niki Kringos e Tom Scarpas. "On the behavior of a parallel elasto-visco-plastic model for asphaltic materials". Mechanics of Materials 42, n. 2 (febbraio 2010): 109–17. http://dx.doi.org/10.1016/j.mechmat.2009.10.005.

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OOTA, Nikita, e Yasuyuki KATO. "Visco-elasto-plastic Behavior of Catheter Generated under Single Stage Step Shear Strain". Proceedings of The Computational Mechanics Conference 2019.32 (2019): 205. http://dx.doi.org/10.1299/jsmecmd.2019.32.205.

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Lee, Chi Seung, Myung Hyun Kim, Min Sung Chun, Tak Kee Lee e Jae Myung Lee. "Fatigue Damage Model for Numerical Assessment of Fatigue Characteristics". Materials Science Forum 580-582 (giugno 2008): 663–66. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.663.

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The aim of this study is the development of a numerical technique applicable for the fatigue assessment based on the damage mechanics approach. The generalized elasto-visco-plastic constitutive equation, which can consider the internal damage evolution behavior, is developed in order to numerically evaluate the material fatigue responses. Explicit information of the relationships between the mechanical properties and material constants, which are required for the mechanical constitutive and damage evolution equations, are derived. The performance of the developed technique has been verified using the S-N relationship assessment for STS304 stainless steel.

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KASAI, Kazuhiko, Yuiti WATANABE e Nao MINATO. "STUDY ON DYNAMIC BEHAVIOR OF A PASSIVE CONTROL SYSTEM WITH VISCO-ELASTO-PLASTIC DAMPER". Journal of Structural and Construction Engineering (Transactions of AIJ) 70, n. 588 (2005): 87–94. http://dx.doi.org/10.3130/aijs.70.87_1.

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Nagrani, Pranay P., Ritwik V. Kulkarni, Parth U. Kelkar, Ria D. Corder, Kendra A. Erk, Amy M. Marconnet e Ivan C. Christov. "Data-driven rheological characterization of stress buildup and relaxation in thermal greases". Journal of Rheology 67, n. 6 (2 ottobre 2023): 1129–40. http://dx.doi.org/10.1122/8.0000679.

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Thermal greases, often used as thermal interface materials, are complex paste-like mixtures composed of a base polymer in which dense metallic (or ceramic) filler particles are dispersed to improve the heat transfer properties of the material. They have complex rheological properties that impact the performance of the thermal interface material over its lifetime. We perform rheological experiments on thermal greases and observe both stress relaxation and stress buildup regimes. This time-dependent rheological behavior of such complex fluid-like materials is not captured by steady shear-thinning models often used to describe these materials. We find that thixo-elasto-visco-plastic (TEVP) and nonlinear-elasto-visco-plastic (NEVP) constitutive models characterize the observed stress relaxation and buildup regimes, respectively. Specifically, we use the models within a data-driven approach based on physics-informed neural networks (PINNs). PINNs are used to solve the inverse problem of determining the rheological model parameters from the dynamic response in experiments. These training data are generated by startup flow experiments at different (constant) shear rates using a shear rheometer. We validate the “learned” models by comparing their predicted shear stress evolution to experiments under shear rates not used in the training datasets. We further validate the learned TEVP model by solving a forward problem numerically to determine the shear stress evolution for an input step-strain profile. Meanwhile, the NEVP model is further validated by comparison to a steady Herschel–Bulkley fit of the material’s flow curve.

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KASAI, Kazuhiko, Michihiko TERAMOTO e Yuichi WATANABE. "BEHAVIOR OF A PASSIVE CONTROL DAMPER COMBINING VISCO-ELASTIC AND ELASTO-PLASTIC DEVICES IN SERIES". Journal of Structural and Construction Engineering (Transactions of AIJ) 67, n. 556 (2002): 51–58. http://dx.doi.org/10.3130/aijs.67.51_1.

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Gui, Zhong-xiang, Xiao Hu e Zi-jian Wang. "An elasto-visco-plastic constitutive model of polypropylene incorporating craze damage behavior and its validation". Journal of Central South University 24, n. 6 (giugno 2017): 1263–68. http://dx.doi.org/10.1007/s11771-017-3530-9.

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Tabourot, Laurent, Pascale Balland, Jonathan Raujol-Veillé, Mathieu Vautrot, Christophe Déprés e Franck Toussaint. "Compartmentalized Model for the Mechanical Behavior of Titanium". Key Engineering Materials 504-506 (febbraio 2012): 673–78. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.673.

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As close as you watch them, the materials (especially metals) present discontinuities that can easily be qualified as strong. Dislocations, structures formed by these dislocations, phases and grains are all discontinuities, also sources of heterogeneity, with effects on material behavior that are not really well reproduced by a model based on a continuity assessment. Consequently, the materials should be considered as a set of compartments with different behaviors. This promotes an alternative way to define models. A coherent modeling process is probably the integration of the different behaviors of the material compartments within the global model. The objective is here to build an efficient elasto(visco)plastic model of the mechanical behavior of titanium combining compartmentalized behaviors. After setting the frame of the study, which is of primary importance, the proposed modeling process is running as follows (i) choose a local behavior, (ii) identify the parameters of crystalline texture that must be integrated into the simulation and (iii) finally formulate a way of combining local compartments behaviors. The intrinsic properties of Finite Element codes are used to achieve the integration of the whole system.

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Savard, Antoine, e Bruno Tremblay. "On the sensitivity of sea ice deformation statistics to plastic damage". Cryosphere 18, n. 4 (30 aprile 2024): 2017–34. http://dx.doi.org/10.5194/tc-18-2017-2024.

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Abstract. We implement a plastic damage parametrization, distinct from the elastic damage in the elasto-brittle framework, in the standard viscous–plastic (VP) sea ice model to disentangle its effect from resolved model physics (visco-plastic with and without damage) on its ability to reproduce observed scaling laws of deformation. To this end, we compare scaling properties and multifractality of simulated divergence and shear strain rate, as proposed in the Sea Ice Rheology Experiment (SIREx) studies, with those derived from the RADARSAT Geophysical Processor System (RGPS). Results show that including a plastic damage parametrization in the standard viscous–plastic model increases the spatial but decreases the temporal localization of simulated linear kinematic features (LKFs) and brings all spatial deformation rate statistics in line with observations from RGPS without the need to increase the mechanical shear strength of sea ice as recently proposed for lower-resolution viscous–plastic sea ice models. In fact, including damage with a healing timescale of th=30 d and an increased mechanical strength unveils multifractal behavior that does not fit the theory. Therefore, a plastic damage parametrization is a powerful tuning knob affecting the deformation statistics of viscous–plastic sea ice.

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Rondón Quintana, Hugo Alexander, Carlos Alfonso Zafra e Fredy Reyes. "RUTTING IN ASPHALT MIXTURES – A REVIEW". Revista Ingenierías Universidad de Medellín 22, n. 43 (24 maggio 2024): 1–26. http://dx.doi.org/10.22395/rium.v22n43a3.

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Vehicles that pass over a pavement structure induce load and unload cycles that generate recoverable (resilient) and permanent (plastic) deformations within layers. Pavement has been developing studies since the decade of the 60´s with the purpose of attempting to understand the visco-elasto-plastic behavior of asphalt mixtures. This has the purpose of evaluating and understanding how the main damage mechanisms that are sought to be controlled in flexible pavement design methods are generated. One of the main damage mechanisms for these types of pavements is rutting. Based on the reviewed literature in relation to the phenomenon of rutting in asphalt mixtures, this article depicts and describes in summary, the main variables that influence the generation of said phenomenon in pavement. The end of the article presents the evolution of equations developed through theoretical and experimental studies in order to attempt to predict the phenomenon of rutting.

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Takamura, Masato, Shigeru Nishimura e Hideyuki Sunaga. "Investigation on Effect of Slide Motion Control on Stamping of High Strength Steel Sheets". Key Engineering Materials 554-557 (giugno 2013): 1331–37. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1331.

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High strength steel sheets are increasingly used in automotive body parts with the aim of weight reduction, but their use urgently requires further improvement in sheet forming technology to overcome difficulties such as poor formability, dimensional inaccuracy, etc. On the other hand, servo press facilities are becoming increasingly used in industry and many attempts are being made to bring out their characteristic features for enhancing the formability of high strength steel sheets. Although some of these attempts have been successful in finding the advantages of servo presses for improving formability and dimensional accuracy, the mechanisms of such improvements have yet to be clarified in conjunction with the mechanical properties of the materials used. One of the most remarkable features of the servo press lies in its flexibility in slide motion control. It is thus effective to investigate the relevance of strain rate sensitivity of a material to the mechanism of improvement in formability enabled by the flexible slide motion of the servo press. However, very few studies have been carried out with material testing, material modeling, and numerical analyses combined with experimental verifications. In this study, Norton’s creep model was implemented in the FEM solver in order to take into account visco-elasto-plastic deformation including stress relaxation behavior. Parameters for the visco-elasto-plastic material model were identified through physical measurements and FEM simulations of uniaxial tension and crosshead displacement dwell tests, as shown in Fig. 1. The identified material model was applied to sheet forming simulations of an automotive body part and validity of the model was examined by comparing with stamping experiments using a servo press with a variety of slide motions. Numerical results with the identified material model showed the same tendency with respect to the slide motions as the experimental results. Stress relaxation behavior was found to be an important factor for improving formability enabled by modifying the slide motion.

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Frija, Mounir, Raouf Fathallah e T. Hassine. "Finite Element Prediction of Laser Shock Peened Surface Modifications in Ti-6Al-4V Alloy". Key Engineering Materials 417-418 (ottobre 2009): 853–56. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.853.

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This paper presents a numerical simulation of the Laser Shock Peening process (LSP) using ﬁnite element method. The majority of the controlling parameters of the process have been taken into account. The laser loading has been characterised by using a repetitive time Gaussian increment pressure applied uniformly at circular impacted zone. The behavior of the subjected material is supposed to be elasto-visco-plastic coupled with damage using the Johnson Cook law with his shear failure model. The proposed model leads to obtain the surface inducing modifications, which are classified in this work into three categories: (i) the in-depth residual stress profile, (ii) the induced plastic strains profile and (iii) also the superficial damage which can be induced in few cases where the operating conditions are not well chosen. An application on a laser shock peened super alloy Ti-6Al-4V has been carried out. The comparison of the residual stresses, obtained by X-ray diffraction method and by ﬁnite element calculation, shows a good correlation.

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Weeger, Oliver, Dominik Schillinger e Ralf Müller. "Mixed isogeometric collocation for geometrically exact 3D beams with elasto-visco-plastic material behavior and softening effects". Computer Methods in Applied Mechanics and Engineering 399 (settembre 2022): 115456. http://dx.doi.org/10.1016/j.cma.2022.115456.

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Behbahani, H., H. Ziari e N. Kamboozia. "Evaluation of the visco-elasto-plastic behavior of glasphalt mixtures through generalized and classic Burger’s models modification". Construction and Building Materials 118 (agosto 2016): 36–42. http://dx.doi.org/10.1016/j.conbuildmat.2016.04.157.

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Hirsekorn, Martin, Frank Petitjean e Arnaud Deramecourt. "A continuous threshold model for the visco-elasto-plastic behavior of PET based multi-layer polymeric films". Mechanics of Time-Dependent Materials 14, n. 1 (11 settembre 2009): 25–45. http://dx.doi.org/10.1007/s11043-009-9091-z.

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Shakhov, Sergey, e Nikita Nikolaev. "Management of structural and mechanical properties of moulding compound using mineral additives". MATEC Web of Conferences 239 (2018): 04022. http://dx.doi.org/10.1051/matecconf/201823904022.

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The purpose of work: the choice of the rational composition of the batch mixture, which improves the molding properties of the silt loams in the production of wall ceramics by the method of plastic molding. In the course of the study, the fraction-size distribution and morphological features of the fractions were analyzed on a photometric sedimentometer FSX-6K and by optical microscopy. Determination of the plastic strength of elasto-visco-plastic systems was carried out by Rehbinder’s conical plastometer. The values of fast and slow elastic and plastic deformations were determined on an installation operating on the principle of a parallel- shifting plate. For molding compounds with various corrective mineral additives, optimum values of molding moisture in which the compound is not adversely affected by shortage and excess moisture have been experimentally established; moduli of fast and slow elastic deformation and other structural and mechanical characteristics are determined. The percent values of the reduced deformations were obtained on the basis of rheological curves of disperse systems in the axes “deformation - shear time”. It is established that the additions of components of different genesis and with different fraction morphology affect the deformation behavior of the molding compounds.

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Giannokostas, Konstantinos, Pantelis Moschopoulos, Stylianos Varchanis, Yannis Dimakopoulos e John Tsamopoulos. "Advanced Constitutive Modeling of the Thixotropic Elasto-Visco-Plastic Behavior of Blood: Description of the Model and Rheological Predictions". Materials 13, n. 18 (20 settembre 2020): 4184. http://dx.doi.org/10.3390/ma13184184.

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This work focuses on the advanced modeling of the thixotropic nature of blood, coupled with an elasto-visco-plastic formulation by invoking a consistent and validated model for TEVP materials. The proposed model has been verified for the adequate description of the rheological behavior of suspensions, introducing a scalar variable that describes dynamically the level of internal microstructure of rouleaux at any instance, capturing accurately the aggregation and disaggregation mechanisms of the RBCs. Also, a non-linear fitting is adopted for the definition of the model’s parameters on limited available experimental data of steady and transient rheometric flows of blood samples. We present the predictability of the new model in various steady and transient rheometric flows, including startup shear, rectangular shear steps, shear cessation, triangular shear steps and LAOS tests. Our model provides predictions for the elasto-thixotropic mechanism in startup shear flows, demonstrating a non-monotonic relationship of the thixotropic index on the shear-rate. The intermittent shear step test reveals the dynamics of the structural reconstruction, which in turn is associated with the aggregation process. Moreover, our model offers robust predictions for less examined tests such as uniaxial elongation, in which normal stress was found to have considerable contribution. Apart from the integrated modeling of blood rheological complexity, our implementation is adequate for multi-dimensional simulations due to its tensorial formalism accomplished with a single time scale for the thixotropic effects, resulting in a low computational cost compared to other TEVP models.

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Giannokostas, Konstantinos, Yannis Dimakopoulos, Andreas Anayiotos e John Tsamopoulos. "Advanced Constitutive Modeling of the Thixotropic Elasto-Visco-Plastic Behavior of Blood: Steady-State Blood Flow in Microtubes". Materials 14, n. 2 (13 gennaio 2021): 367. http://dx.doi.org/10.3390/ma14020367.

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The present work focuses on the in-silico investigation of the steady-state blood flow in straight microtubes, incorporating advanced constitutive modeling for human blood and blood plasma. The blood constitutive model accounts for the interplay between thixotropy and elasto-visco-plasticity via a scalar variable that describes the level of the local blood structure at any instance. The constitutive model is enhanced by the non-Newtonian modeling of the plasma phase, which features bulk viscoelasticity. Incorporating microcirculation phenomena such as the cell-free layer (CFL) formation or the Fåhraeus and the Fåhraeus-Lindqvist effects is an indispensable part of the blood flow investigation. The coupling between them and the momentum balance is achieved through correlations based on experimental observations. Notably, we propose a new simplified form for the dependence of the apparent viscosity on the hematocrit that predicts the CFL thickness correctly. Our investigation focuses on the impact of the microtube diameter and the pressure-gradient on velocity profiles, normal and shear viscoelastic stresses, and thixotropic properties. We demonstrate the microstructural configuration of blood in steady-state conditions, revealing that blood is highly aggregated in narrow tubes, promoting a flat velocity profile. Additionally, the proper accounting of the CFL thickness shows that for narrow microtubes, the reduction of discharged hematocrit is significant, which in some cases is up to 70%. At high pressure-gradients, the plasmatic proteins in both regions are extended in the flow direction, developing large axial normal stresses, which are more significant in the core region. We also provide normal stress predictions at both the blood/plasma interface (INS) and the tube wall (WNS), which are difficult to measure experimentally. Both decrease with the tube radius; however, they exhibit significant differences in magnitude and type of variation. INS varies linearly from 4.5 to 2 Pa, while WNS exhibits an exponential decrease taking values from 50 mPa to zero.

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SUGAWARA, Kazumasa, Kento SUZUKI, Kazuma OGAWA, Ryoma TANAKA e Masayuki NAGANO. "MECHANICAL BEHAVIOR AND SIMPLIFIED MODELING METHOD OF TIMBER FRAME STRUCTURES WITH VISCO-ELASTIC DAMPER AND ELASTO-PLASTIC MEMBER". AIJ Journal of Technology and Design 26, n. 63 (20 giugno 2020): 531–36. http://dx.doi.org/10.3130/aijt.26.531.

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Siddiquee, Mohammed Saiful Alam, e Amin Hamdi. "A Time-Dependent Double Hardening Model for Soft Rock". Advances in Civil Engineering 2019 (7 ottobre 2019): 1–18. http://dx.doi.org/10.1155/2019/2927178.

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The time-dependent behavior of soft rock is very important in tunnel construction through soft rock. There is always a chance of creep failure due to sustained loading along the crest of the tunnel. In this research, a three-component elasto-visco-plastic framework is used to develop a time-dependent double hardening model to predict the behavior of soft rock both in compression and shear. Due to the limitation of time-dependent single yield hardening model in predicting the behavior of soft rock in compression direction (volumetric deformation) of loading, another time-dependent yield surface is added to the compression direction. The intersection of two-yield surface usually gives rise to singularity phenomenon, which is avoided by using Koiter’s generalization principle. A new formulation of the stress-integration of incremental stress-strain equations is proposed. A series of triaxial compression tests were carried out at different strain rates to calculate the model parameters. Then, the model is used to simulate the various behavioral features of soft rock.

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Alil, Luminita-Cristina, Michel Arrigoni, Cristian Barbu, guilhem Bles, Lorena Deleanu, Pavel Mostovykh e Simona M. Sandu. "Mechanical Properties of Ultra-high Molecular Weight Polyethylene (tensylon�) from Tensile Tests". Materiale Plastice 59, n. 1 (5 aprile 2022): 51–69. http://dx.doi.org/10.37358/mp.22.1.5559.

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Results on mechanical properties of Tensylon� composites at room temperature are presented. Single-ply and two-ply samples, obtained from the ply-precursor sheet (of two orthogonal layers) have been subjected to: load till failure in traction, at different strain rates (below 10-1 s-1) and cycles of successive loading and unloading and 5 min stress relaxation period. The characteristic times of relaxation are evaluated and the difference in values of Young modulus before and after the relaxation stage is established. A complex cyclic/relaxation test requires a visco-elasto-plastic model of Tensylon�, and allows to quantify it. This model predicts the material behavior in other types of tests: for instance, it predicts strain rate independence of loading to failure in the considered strain rate range. Cyclic tests fulfilled at a fixed strain rate suggest that Tensylon� is an elastoplastic material without noticeable viscosity. The proposed model, additively including nonlinear viscoelasticity and plastic flow with strengthening, shows a satisfactory agreement with experimental data. It also agrees that the material is strain-rate-insensitive in the range 10-3 s-1-10-1 s-1.

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Signoret, Charles, Anne-Sophie Caro-Bretelle, José-Marie Lopez-Cuesta, Patrick Ienny e Didier Perrin. "Impact of PP Impurities on ABS Tensile Properties: Computational Mechanical Modelling Aspects". Polymers 13, n. 10 (19 maggio 2021): 1647. http://dx.doi.org/10.3390/polym13101647.

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Recycling of plastics is hindered by their important variety and strong incompatibility. However, sorting technologies bear costs and meet limits. Very high purities (<2 wt%) are difficult to reach. Yet, such rates may be detrimental to functional properties. In this work, an ABS matrix (major plastic in Waste of Electrical and Electronic Equipments) was filled with 4 wt% of PP to mimic impurities in ABS after recycling. PP-g-MA was introduced in the blend to improve the compatibility. A finite element model was developed from the mechanical behavior of each component. ABS and PP were individually characterized from tensile tests instrumented with photomechanics and their behaviors were modelled through a set of numerical parameters (elasto-visco-plasticity with a Gurson’s criterion behavior). Comparison between the determinist model results and the experimental data (strength, volumetric variation) shows that this type of modelling could be a predictive tool in order to anticipate composite mechanical properties and to understand micromechanisms of deformation (damage, cavitation). The main result is that PP introduced at 4 wt% into ABS does not alter the static mechanical properties despite polymers incompatibility. The addition of PP-g-MA modifies the local properties and possibly conduct to a premature breakage of the polymer blend.

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Avril, Stéphane, Fabrice Pierron, Michael A. Sutton e Junhui Yan. "Identification of elasto-visco-plastic parameters and characterization of Lüders behavior using digital image correlation and the virtual fields method". Mechanics of Materials 40, n. 9 (settembre 2008): 729–42. http://dx.doi.org/10.1016/j.mechmat.2008.03.007.

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34

Créac'hcadec, R., e J. Y. Cognard. "2-D Modeling of the Behavior of an Adhesive in an Assembly Using a Non-Associated Elasto-Visco-Plastic Model". Journal of Adhesion 85, n. 4-5 (22 maggio 2009): 239–60. http://dx.doi.org/10.1080/00218460902881790.

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35

Hou, Rongbin, Qingzhe Cui, Yingying Guo, Yanke Shi e Jinwei Fu. "A new elasto-visco-plastic damage model and numerical simulation method used for time-dependent behavior prediction of deep tunnel". Computers and Geotechnics 168 (aprile 2024): 106129. http://dx.doi.org/10.1016/j.compgeo.2024.106129.

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36

Boudet, Julien, François Auslender, Michel Bornert e Yuri Lapusta. "An incremental variational formulation for the prediction of the effective work-hardening behavior and field statistics of elasto-(visco)plastic composites". International Journal of Solids and Structures 83 (aprile 2016): 90–113. http://dx.doi.org/10.1016/j.ijsolstr.2016.01.003.

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37

Lee, Jae Myung, Jeom Kee Paik, Myung Hyun Kim e Yutaka Toi. "Development of Damage Assessment Method for Steel Structures Using Material-Structure Coupling Analysis". Key Engineering Materials 297-300 (novembre 2005): 122–27. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.122.

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Once assessment of material failure characteristics is captured precisely in a unified way, it can be directly incorporated to the structural failure assessment under various loading environments, based on the theoretical backgrounds so called Local Approach to Fracture. The aim of this study is the development of an expert system applicable for the assessment of structural integrity throughout crack initiation and structural failure based on the Local Approach to Fracture. The generalized elasto-visco-plastic constitutive equation, which can consider the internal damage evolution behavior, was developed and employed in the 3-D FEA code in order to numerically evaluate the material and/or structural responses. Explicit information of the relationships between the mechanical properties and material constants, which are required for the mechanical constitutive and damage evolution equations for each material, was implemented in an automatic system using genetic algorithm based on an inference system. The material constants selected from genetic search and constitutive equations are used directly in the failure assessment of material and/or structures. The performance of the developed system has been evaluated for the S-N relationship assessment of several materials as well as the crack initiation assessment of various weldments in steel structures.

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Lesueur, Martin, Thomas Poulet e Manolis Veveakis. "Fault reactivation during fluid production, modelled as a multi-physics multi-scale instability". E3S Web of Conferences 205 (2020): 03002. http://dx.doi.org/10.1051/e3sconf/202020503002.

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During fluid production in carbonate reservoir rock under high Pressure and Temperature conditions, the production-enhanced shear-heating of a creeping fault can lead to a thermal run-away. The reactivation of the fault is then accompanied with a large increase of permeability (by orders of magnitude) due to the dissolution of the rock. As a detrimental consequence for the industry, pressure equilibrates between the two compartments of the reservoir delimited by an initially sealing fault. To model such behavior, we present a three-scale framework implementing a THMC fault reactivation model. The framework links the three different scales of the problem: (a) the poro-elastic reservoir (km) scale, where faults are treated as frictional interfaces with the equivalent friction law being determined from the meso-scale; (b) the thermo-poro-chemo-visco-elasto-plastic fault at the meso-scale (m), encompassing all the physics at hand; and (c) its chemo-mechanically altered pore structure at the micro-scale (μm), where meso-scale properties (like permeability) are upscaled. In the present approach, the multiscaling approach allows us to replace the common use of empirical laws to the profit of upscaled physical laws. The framework is used to simulate the fault valve behavior appearing during induced reactivation coming from the production scenario next to a sealing fault.

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Armstrong, Matthew, Erin Milner, Chi Nguyen, Trevor Corrigan e Yu-Fan Lee. "Visualizing and exploring nonlinear behavior, timescales, and mechanical signatures of human blood". Biorheology 58, n. 1-2 (4 agosto 2021): 1–26. http://dx.doi.org/10.3233/bir-201007.

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BACKGROUND: Human blood is a thixo-elasto-visco-plastic (TEVP) material that exhibits unique fluctuations in mechanical properties based on physiology, and shear rate. We demonstrate new visual tools to help visualize and characterize these varied mechanical properties. OBJECTIVE: Our objective is to demonstrate contemporary visual and numerical tools to help visualize and characterize the varied mechanical properties of human blood. METHODS: Using the ARESG2 strain-controlled rheometer with double wall couette geometry and eight human blood donors, with lab test results, elastic and viscous properties are investigated using Series of Physical Processes (SPP) and MITLaos to both analyze and visualize the mechanical signatures of the blood. RESULTS: Variations of mechanical properties are shown via SPP generated Cole-Cole plots and MITLaos analysis. These variations are a function of physiological properties of blood on the day of the blood draw based on hematocrit, fibrinogen, cholesterol, triglycerides, and a host of other proteins and constituents. Each rheological experiment with blood is replicated with an analogous experiments with 0.04 wt% xanthan in glycerol, and water to demonstrate that the mechanical properties of the human blood, and its rheological signatures are unique to human blood. CONCLUSIONS: Human blood is proven to be a TEVP material, as shown on a series of Cole-Cole plots for eight different donors, at two different frequency and strain amplitude combinations. Variations in Cole-Cole plots for each donor are shown. MITLaos average mechanical properties are calculated and shown. Aggregated elastic and viscous projections and a Cole-Cole plot is shown for Donors 1–8, along with 95% confidence interval.

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Frenelus, Wadslin, e Hui Peng. "Evaluating the Time-Dependent Behavior of Deeply Buried Tunnels in Soft Rock Environments and Relevant Measures Guaranteeing Their Long-Term Stability". Applied Sciences 13, n. 18 (21 settembre 2023): 10542. http://dx.doi.org/10.3390/app131810542.

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The time-dependent behavior and long-term stability of deep-buried tunnels in soft rocks have received lots of considerations in tunnel engineering and allied sciences. To better explore and deepen the engineering application of rock creep, extensive research studies are still needed, although fruitful outcomes have already been obtained in many related investigations. In this article, the Weilai Tunnel in China’s Guangxi province is studied, taking its host rocks as the main research object. In fact, aiming at forecasting the time-varying deformation of this tunnel, a novel elasto-visco-plastic creep constitutive model with two variants is proposed, by exploiting the typical complex load–unload process of rock excavation. The model is well validated, and good agreements are found with the relevant experimental data. Moreover, the time-dependent deformation rules are properly established for the surrounding rocks, by designing two new closed-form solutions based on the proposed creep model and the Hoek–Brown criterion. To investigate the effects of the major creep parameters and the geological strength index (GSI) of the surrounding rocks on the time-dependent trend of the tunnel, an in-depth parametric study is carried out. It is shown that the convergence deformation of the surrounding rocks is remarkably influenced by the GSI and creep parameters. The convergence deformations calculated from the closed-form solutions conform well to the on-site monitoring data. In only 27 days after excavation, the creep deformation of the Weilai tunnel overtakes 400 mm, which is enormous. To guarantee the long-term stability of this tunnel, a robust support scheme and its long-term monitoring with appropriate remote sensors are strongly suggested.

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Gribov, D. S., e P. V. Trusov. "The Tree-Level Viscoelastic Model: Analysis of the Influence of the Packing Defect Energy to the Response of Materials under Complex Loading". PNRPU Mechanics Bulletin, n. 4 (15 dicembre 2020): 60–73. http://dx.doi.org/10.15593/perm.mech/2020.4.06.

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The development of new and improvement of existing modes of thermomechanical treatment of metals and alloys in present conditions is impossible without development of appropriate mathematical models, that allow determining material characteristics during technological processes. Constitutive equations are the core, the main components that determine the quality of such models. Macrophenomenological theories of plasticity relying on processing the results of experiments on macrosamples, have become widespread as such in solving applied problems of solid mechanics. Taking into account the need to describe the memory of processes, the equations of this class have a complicated mathematical structure, require expensive tests (generally speaking, for complex loading) for each material, due to which they are not universal. In the past 15-20 years, constitutive models based on the introduction of internal state variables, of a multilevel approach, and physical theories of inelasticity (plasticity, viscoplasticity) became very popular. Models of this class are focused on describing the evolving structure (including microstructure), which ultimately determines the physical and mechanical properties of materials and constructions. As the physical mechanisms and their carriers are identical for wide classes of materials, the models of this class have significant versatility, including the prediction of behavior of new, not yet existing materials, to study the physical mechanisms of the occurrence of various effects, observed in macro experiments. Hardening is one of interesting effects observed in experiments on complex (including cyclic) loading (as compared to directional loading) of samples, made of various metals and alloys, arising from a significant evolution of the microstructure. Empirical data analysis made it possible to establish that the tendency to manifest this effect is usually experienced by metals and alloys with a low stacking fault energy (SFE). The paper provides a brief analysis of the experimental work and mathematical models describing the response of a material to complex deformation. It is noted that macrophenomenological theories do not allow one to describe in an explicit form the evolution of the microstructure and the carriers of plastic deformation and hardening mechanisms, thus they do not provide an opportunity to explain the physical reasons for the above effects. The purpose of this work is to develop, study and implement a multilevel elasto-visco-plastic model that allows describing the evolution of crystal lattice defects in materials with different SFE under different thermomechanical processing, different strengthening mechanisms at different structural-scale levels. In the framework of constructing a constitutive model, special attention is paid to the development of a submodel, focused on description of the evolution dislocations and barrier densities on slip systems. Kinetic equations for dislocation densities on slip systems make it possible to analyze the nucleation of dislocations due to the activation of Frank - Read sources, annihilation of dislocations of different signs on one slip system, interaction of split dislocations of intersecting slip systems with the formation of barriers. Relations for the description of hardening are given, taking into account the current density of dislocations and barriers. The general structure of the model and the relationship between the parameters of submodels of different levels are considered. An algorithm and a program of implementing the model were developed, the evolution of dislocation densities on slip systems was analyzed, and the intensity of hardening and the formation of barriers on split dislocations were obtained depending on the type of loading.

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Lehner, Kerstin, Anna Kalteis e Zoltan Major. "MODELLING AND SIMULATION OF LATTICE STRUCTURES USING VARIOUS MATERIAL MODELS FOR POLYMERIC MATERIALS". Acta Polytechnica CTU Proceedings 18 (23 ottobre 2018): 48. http://dx.doi.org/10.14311/app.2018.18.0048.

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Based on lightweight design concepts, lattices are increasingly considered as internal structures. This work deals with the simulation of periodically constructed lattices to characterize their behaviour under different loadings considering various material models. A thermo-mechanical analysis was done, which is resulting in negative CLTE-values (Coefficient of Linear Thermal Expansion). Simulations with linear-elastic behaviour were evaluated regarding the tensile, compression and shear modulus and the Poisson’s ratio. Some of the investigated structures behave auxetic. Beside the linear elastic behaviour, also the hyper-elastic and visco-elastic behaviour of some structures were investigated. Furthermore, elasto-plastic simulations were performed where the applied loading was biaxial. As a result the initial yield surfaces were presented. The individual RVEs (Representative Volume Elements) can be utilized for different areas of application dependent on the used materials.

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Bles, G., W. K. Nowacki e A. Tourabi. "Experimental study of the cyclic visco-elasto-plastic behaviour of a polyamide fibre strap". International Journal of Solids and Structures 46, n. 13 (giugno 2009): 2693–705. http://dx.doi.org/10.1016/j.ijsolstr.2009.02.015.

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Chen, Bao, Xuan Cang Wang e Ke Mu. "Mechanical Response of Longitudinal Slope Segments Based on Burgers Model". Advanced Materials Research 243-249 (maggio 2011): 4172–77. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4172.

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Asphalt Pavement was damaged more seriously in longitudinal Gradient than common segment because of its special load bearing conditions. This paper establishes a 3D Visco-elasto-plastic Finite Element to analyses the stress respond of pavement structure, calculating the discipline of stress behaviors under different gradient. Burgers model was used to study the factors which can influence on tracking, for example longitudinal Gradient, speeds and frequency of axle load. Result of calculation show that the maximum shear stress grows as the gradient increases. Rutting of pavement was small before a certain number of axle loads, but when beyond the certain number, the rutting incense notably, and the slower speed the vehicle has, the deeper tracking the pavement responds.

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Park, Jinhwa, e Youngung Jeong. "Prediction and Validation of Stress Triaxiality Assisted by Elasto-Visco-Plastic Polycrystal Model". Korean Journal of Metals and Materials 60, n. 8 (5 agosto 2022): 607–18. http://dx.doi.org/10.3365/kjmm.2022.60.8.607.

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The ΔEVPSC numerical code based on the elasto-visco-plastic HEM (Homogeneous Effective Medium) provides a multiscale constitutive modeling framework that is suitable for describing a wide range of mechanical behaviors of polycrystalline metals. In this study, an AA6061-T6 aluminum sample was chosen to validate the predictive capability of the ΔEVPSC stand-alone (ΔEVPSC-SA) code on stress triaxiality and its evolution until fracture. The model parameters were calibrated by fitting the uniaxial flow stress-strain curve, and the initial crystallographic orientation distribution (COD) was obtained using X-ray diffraction and electron backscattered diffraction (EBSD) methods. The statistical representativeness of the COD was further examined by comparing the experimental R-values with model predictions based on a set of CODs obtained via the two mentioned diffraction methods. The results suggest that the X-ray scan does not represent the texture very well, and instead, an entire cross-sectional EBSD scan is required, even though the texture gradient along the through-thickness direction is not very significant. The model-calculated triaxiality based on the ΔEVPSC-SA code was verified by comparison with the experimental results from the uniaxial tension, the notched tension, and the plane strain tests. The results were in good agreement with the ΔEVPSC finite element (FE) simulation results and other similar experimental results reported in the literature.

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Spangenberg, Jon, Wilson Ricardo Leal da Silva, Raphaël Comminal, Md Tusher Mollah, Thomas Juul Andersen e Henrik Stang. "Numerical simulation of multi-layer 3D concrete printing". RILEM Technical Letters 6 (8 ottobre 2021): 119–23. http://dx.doi.org/10.21809/rilemtechlett.2021.142.

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This paper presents a computational fluid dynamics model fit for multi-layer 3D Concrete Printing. The numerical model utilizes an elasto-visco-plastic constitutive model to mimic the flow behaviour of the cementitious material. To validate the model, simulation data is compared to experimental data from 3D printed walls. The obtained results show that the numerical model can reproduce the experimental results with high accuracy and quantify the extrusion load imposed upon the layers. Such load is found to exceed the material’s yields stress in certain regions of previously printed layers, leading to layer deformation/flow. The developed and validated numerical model can assist in identifying optimal printing strategies, reducing the number of costly experimental print failures and human-process interaction. By doing so, the findings of this paper helps 3D Concrete Printing move a step closer to a truly digital fabrication process.

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Marzec, Ireneusz, Jacek Tejchman e Andrzej Winnicki. "Computational simulations of concrete behaviour under dynamic conditions using elasto-visco-plastic model with non-local softening". Computers and Concrete 15, n. 4 (25 aprile 2015): 515–45. http://dx.doi.org/10.12989/cac.2015.15.4.515.

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48

Dib, W., G. Bles, A. Blaise e A. Tourabi. "Modelling of cyclic visco-elasto-plastic behaviour of coated woven fabrics under biaxial loading and finite strain". International Journal of Solids and Structures 154 (dicembre 2018): 147–67. http://dx.doi.org/10.1016/j.ijsolstr.2017.08.002.

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Mir, H., F. Thibault e R. DiRaddo. "Modelling Behaviour of PET for Stretch and Micro-Blow Moulding Applications Using an Elasto-Visco-Plastic Material Model". International Polymer Processing 26, n. 2 (maggio 2011): 173–81. http://dx.doi.org/10.3139/217.2414.

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Vignes, Jérémie, Fabrice Schmidt, Gilles Dusserre e Jean Frédéric Dalmasso. "Effect of Moisture on the Behaviour of an Extruded Clay Paste". Key Engineering Materials 554-557 (giugno 2013): 2230–36. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.2230.

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In the industrial process, the moisture of the clay sheet obtained by extrusion and pressed to form a tile varies in time. It depends on the nature and the mixing of the raw materials during the production. In order to model and undersand the influence of the moisture on the pressing step, it is necessary to determine the parameters of the rheological and tribological laws. A study of the rheological behaviour, based on free compression tests on cylinder samples, allowed to use an elasto-visco-plastic behaviour for the extruded clay paste. The different constitutive parameters were estimated by an inverse analysis based on the experimental force/displacement curves. The identification was performed with the optimisation algorithm implemented in the commercial software Forge® 2009. The influence of the water content in the paste on the rheological parameters was identified and fitted using linear models. The friction factor was measured from tests on a rectilign tribometer. To understand the influence of the moisture, we simulated a compression test, using Forge® involving the shaping of a tile lug. This geometry is representative of the state of stress during the pressing of the tile, in an area currently sujected to defects. The numerical model show that an increase of eighteen percent of the moisture allows to decrease by half the pressing force.

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