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Journal articles on the topic 'Elasto-viscoplastic behavior'

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Author: Grafiati

Published: 6 April 2023

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1

Goto, Keita, Takuya Tomioka, Masahiro Arai, and Tetsuya Matsuda. "Elasto-Viscoplastic Analysis of Slanting-Weft Woven Fabric Composites Based on Homogenization Theory." Key Engineering Materials 725 (December 2016): 410–15. http://dx.doi.org/10.4028/www.scientific.net/kem.725.410.

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The elasto-viscoplastic behavior of slanting-weft woven laminates, the fiber bundles of which are not crossed at a right angle, is investigated both macroscopically and microscopically. For this, an analysis model for the [±θ] slanting-weft woven laminate with a cross angle ±θ and its diamond-shaped unit cell are considered. Then, a basic cell, which is quarter of the unit cell, is defined as an analysis domain by considering the point-symmetry of the internal structure. For the basic cell, the homogenization theory for nonlinear time-dependent composites with point-symmetric internal structures is applied. Using the present method, the elasto-viscoplastic analysis of the [±θ] slanting-weft woven laminates subjected to an in-plane uniaxial tensile load is performed. From the analysis results, the macroscopic elasto-viscoplastic behavior and the microscopic stress and strain distributions of the laminates are investigated.

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2

Chenot, J. L., and M. Bellet. "A Velocity Approach to Elasto-Plastic and Elasto-Viscoplastic Calculation by the Finite Element Method." Journal of Engineering for Industry 112, no. 2 (May 1, 1990): 150–54. http://dx.doi.org/10.1115/1.2899558.

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A second order scheme for the time discretization of the elasto-plastic or elasto-viscoplastic behavior is proposed, based on a velocity approach. The complete set of equations is given for the evolution problem in the case of small rotations approximation. The method is quite general and may be applied to a large class of constitutive equations. The finite element discretization is briefly outlined and it is shown that the procedure is quite similar to that of previous displacement formulations. A numerical example concerning the sheet metal forming process, with an elasto-viscoplastic behavior and a membrane approximation, is presented. The numerical tests show a considerable improvement in accuracy for a given increment of time.

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3

Saleem, Muhammad. "Microplane modeling of the elasto-viscoplastic constitution." Journal of Research in Science, Engineering and Technology 8, no. 3 (September 29, 2020): 19–25. http://dx.doi.org/10.24200/jrset.vol8iss3pp19-25.

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In this paper, the elasto-viscoplastic Constitutive model is applied within the Microplane framework. The use of strain-dependent models allows measuring the effect of loading speed on the soil. Additionally, rate-based behavior models in simulation modeling avoid the uniqueness of the ruling equation. The proposed model can plot the stress-strain history on plates with different angles inside the soil. Therefore, valuable information can be obtained about the failure plane. Using the Microplane framework enables this hybrid behavior model to predict local strain.

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4

Wang, Jing Yin, and Fang Liu. "Thermodynamic Properties of Soft Sedimentary Rock in Geotechnical Engineering." Applied Mechanics and Materials 170-173 (May 2012): 687–91. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.687.

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In geotechnical engineering such as supporting of deep and soft rock roadway ,oil drilling , and construction of military underground defensive facility, thermodynamic properties of soft sedimentary rock has guiding significances .The study of the thermal constitutive behavior of rock under temperature has been done for many years, and many achievement have been got on this issue. In this paper, some experimental researches on the thermo-mechanical characteristics of soft sedimentary rock have been presented. Some test results have been simulated with a thermo-elasto-viscoplastic model. The results show that the proposed thermo-elasto-viscoplastic model reflects the visco-elastoplastic properties of rock，and can describe the thermo-mechanical behaviors of soft shale rocks in not only drained conventional triaxial compression tests but also drained triaxial creep tests. So it can be used for analysis of theology and stability of rock engineering.

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5

Bettaieb, Mohamed Ben, Thibaut Van Hoof, Thomas Pardoen, Philippe Dufour, Astrid Lenain, Pascal J. Jacques, and Anne Marie Habraken. "On the elasto-viscoplastic behavior of the Ti5553 alloy." Materials Science and Engineering: A 617 (November 2014): 97–109. http://dx.doi.org/10.1016/j.msea.2014.08.055.

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6

Zeng, Tao, Jian-Fu Shao, and Wei-Ya Xu. "Micromechanical modeling of the elasto-viscoplastic behavior of granite." Comptes Rendus Mécanique 343, no. 2 (February 2015): 121–32. http://dx.doi.org/10.1016/j.crme.2014.11.005.

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7

Adachi, T., F. Oka, and H. B. Poorooshasb. "A Constitutive Model for Frozen Sand." Journal of Energy Resources Technology 112, no. 3 (September 1, 1990): 208–12. http://dx.doi.org/10.1115/1.2905759.

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An elasto-viscoplastic constitutive model for frozen sand is proposed based on the elasto-viscoplasticity theory incorporating the new time measure. The proposed model can describe a number of features of the mechanical behavior of the medium, such as rate sensitivity and strain softening under the triaxial compression test loading conditions. The effects of temperature, ambient pressure and the concentration of soil particles are also discussed.

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8

de Angelis, Fabio. "Computational Aspects in the Elasto/Viscoplastic Material Behavior of Solids." Advanced Materials Research 567 (September 2012): 192–99. http://dx.doi.org/10.4028/www.scientific.net/amr.567.192.

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In the present paper a computational algorithmic procedure is presented for modeling the elasto/viscoplastic behavior of solid materials. The effects of different loading programs on the inelastic behavior of rate-sensitive materials are analyzed with specific numerical examples. An appropriate solution scheme and a consistent tangent operator are applied which are capable to be adopted for general computational procedures. Numerical computations and results are reported which illustrate the rate-dependence of the constitutive model in use.

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9

Tai, Nguyen Huynh Tan. "CALCULATION OF PAVEMENT PERMANENT DEFORMATION USING PERZYNA’S ELASTO-VISCOPLASTIC MODEL." Vietnam Journal of Science and Technology 54, no. 1 (February 20, 2016): 150. http://dx.doi.org/10.15625/0866-708x/54/1/5565.

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In this work, a method for calculation of pavement permanent deformation due to traffic loading is presented. The mechanics behavior of asphalt concrete layer is considered as Perzyna’s elasto-viscoplastic material. The pavement permanent deformation is incrementally calculated using nonlinear finite element method. Model parameters are determined using Hamburg Wheel Tracking Test result.

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10

Koo, Gyeong-Hoi, and Ji-Hyun Yoon. "Inelastic Material Models of Type 316H for Elevated Temperature Design of Advanced High Temperature Reactors." Energies 13, no. 17 (September 2, 2020): 4548. http://dx.doi.org/10.3390/en13174548.

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In this paper, the inelastic material models for Type 316H stainless steel, which is one of the principal candidate materials for elevated temperature design of the advanced high temperature reactors (HTRs) pressure retained components, are investigated and the required material parameters are identified to be used for both elasto-plastic models and unified viscoplastic models. In the constitutive equations of the inelastic material models, the kinematic hardening behavior is expressed with the Chaboche model with three backstresses, and the isotropic hardening behavior is expressed by the Voce model. The required number of material parameters is minimized to be ten in total. For the unified viscoplastic model, which can express both the time-independent plastic behavior and the time-dependent viscous behavior, the constitutive equations have the same kinematic and isotropic hardening parameters of the elasto-plastic material model with two additional viscous parameters. To identify the material parameters required for these constitutive equations, various uniaxial tests were carried out at isothermal conditions at room temperature and an elevated temperature range of 425–650 °C. The identified inelastic material parameters were validated through the comparison between tests and calculations.

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11

Lhadi, Safaa, Maria-Rita Chini, Thiebaud Richeton, Nathalie Gey, Lionel Germain, and Stéphane Berbenni. "Micromechanical Modeling of the Elasto-Viscoplastic Behavior and Incompatibility Stresses of β-Ti Alloys." Materials 11, no. 7 (July 17, 2018): 1227. http://dx.doi.org/10.3390/ma11071227.

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Near β titanium alloys can now compete with quasi-α or α/β titanium alloys for airframe forging applications. The body-centered cubic β-phase can represent up to 40% of the volume. However, the way that its elastic anisotropy impacts the mechanical behavior remains an open question. In the present work, an advanced elasto-viscoplastic self-consistent model is used to investigate the tensile behavior at different applied strain rates of a fully β-phase Ti alloy taken as a model material. The model considers crystalline anisotropic elasticity and plasticity. It is first shown that two sets of elastic constants taken from the literature can be used to well reproduce the experimental elasto-viscoplastic transition, but lead to scattered mechanical behaviors at the grain scale. Incompatibility stresses and strains are found to increase in magnitude with the elastic anisotropy factor. The highest local stresses are obtained toward the end of the elastic regime for grains oriented with their <111> direction parallel to the tensile axis. Finally, as a major result, it is shown that the elastic anisotropy of the β-phase can affect the distribution of slip activities. In contrast with the isotropic elastic case, it is predicted that {112} <111> slip systems become predominant at the onset of plastic deformation when elastic anisotropy is considered in the micromechanical model.

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12

TANAKA, Shigeyuki, Yoshihiro TOMITA, and Taiji ADACHI. "Numerical Simulation of Thermo-Elasto-Viscoplastic Deformation Behavior of Glassy Polymers." Transactions of the Japan Society of Mechanical Engineers Series A 64, no. 623 (1998): 1916–22. http://dx.doi.org/10.1299/kikaia.64.1916.

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13

VANDOMMELEN, J., D. PARKS, M. BOYCE, W. BREKELMANS, and F. BAAIJENS. "Micromechanical modeling of the elasto-viscoplastic behavior of semi-crystalline polymers." Journal of the Mechanics and Physics of Solids 51, no. 3 (March 2003): 519–41. http://dx.doi.org/10.1016/s0022-5096(02)00063-7.

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14

Liu, Lu, Yao Yao, and Tao Zeng. "A micromechanical analysis to the elasto-viscoplastic behavior of solder alloys." International Journal of Solids and Structures 159 (March 2019): 211–20. http://dx.doi.org/10.1016/j.ijsolstr.2018.10.003.

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15

Toi, Yutaka, and Jae-Myung Lee. "Thermal Elasto-Viscoplastic Damage Behavior of Structural Members in Hot-Dip Galvanization." International Journal of Damage Mechanics 11, no. 2 (April 2002): 171–85. http://dx.doi.org/10.1106/105678902023083.

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16

Parenteau, T., E. Bertevas, G. Ausias, R. Stocek, Y. Grohens, and P. Pilvin. "Characterisation and micromechanical modelling of the elasto-viscoplastic behavior of thermoplastic elastomers." Mechanics of Materials 71 (April 2014): 114–25. http://dx.doi.org/10.1016/j.mechmat.2013.06.010.

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17

Zhang, Feng, Yong-lin Xiong, Yusuke Itani, and Eishi One. "Thermo-elasto-viscoplastic mechanical behavior of manmade rock and its numerical modeling." Underground Space 4, no. 2 (June 2019): 121–32. http://dx.doi.org/10.1016/j.undsp.2018.12.003.

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18

TANG, H., F. BARTHELAT, and H. ESPINOSA. "An elasto-viscoplastic interface model for investigating the constitutive behavior of nacre." Journal of the Mechanics and Physics of Solids 55, no. 7 (July 2007): 1410–38. http://dx.doi.org/10.1016/j.jmps.2006.12.009.

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19

Zhu, Yilin. "An elasto-viscoplastic model to describe the ratcheting behavior of articular cartilage." Biomechanics and Modeling in Mechanobiology 17, no. 6 (August 4, 2018): 1875–83. http://dx.doi.org/10.1007/s10237-018-1062-3.

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20

Tarcha, B. A., B. P. P. Forte, E. J. Soares, and R. L. Thompson. "THE ELASTO-VISCOPLASTIC-TIME-DEPENDENT NATURE OF WAXY CRUDE OILS." Revista de Engenharia Térmica 13, no. 2 (December 31, 2014): 16. http://dx.doi.org/10.5380/reterm.v13i2.62088.

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Production in reservoirs located in deep and ultra-deep water that contain waxy crude oils faces a huge obstacle imposed by the low temperatures of the environment. When the waxy crude oil is subjected to a temperature below the Gelation Temperature, as in the case investigated in the present work, it exhibits a variety of non-Newtonian features: elasticity, plasticity, viscous effects, and time-dependency, which renders to this material a highly complex behavior. A crucial feature that is frequently ignored when the determination of the yield stress is being carried out is the timedependency nature of these materials. We demonstrate that this character has a significant impact on the measurement of the yield stress and, therefore, values obtained from a protocol that neglects time-dependency can be substantially different from a more careful procedure.

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21

Ali, Bassem, Marwan Sadek, and Isam Shahrour. "Elasto-viscoplastic Finite Element Analysis of the Long-term Behavior of Flexible Pavements." Road Materials and Pavement Design 9, no. 3 (January 2008): 463–79. http://dx.doi.org/10.1080/14680629.2008.9690128.

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22

Tomita, Yoshihiro, Tsuyoshi Higo, Koji Mimura, and Yuji Kouma. "Flow Localization Behavior of Elasto-Viscoplastic Plane-Strain Blocks under High Strain Rate." Transactions of the Japan Society of Mechanical Engineers Series A 60, no. 570 (1994): 461–66. http://dx.doi.org/10.1299/kikaia.60.461.

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23

Kim, Hyun-Gyu, and Seyoung Im. "An investigation on collapse behavior of shear localization in elasto-thermo-viscoplastic materials." Journal of Mechanical Science and Technology 20, no. 12 (December 2006): 2178–88. http://dx.doi.org/10.1007/bf02916334.

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24

Thiagarajan, Ganesh, Yonggang Y. Huang, and K. Jimmy Hsia. "Fracture Simulation Using an Elasto-Viscoplastic Virtual Internal Bond Model With Finite Elements." Journal of Applied Mechanics 71, no. 6 (November 1, 2004): 796–804. http://dx.doi.org/10.1115/1.1796451.

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A virtual internal bond (VIB) model for isotropic materials has been recently proposed by Gao (Gao, H., 1997, “Elastic Waves in a Hyperelastic Solid Near its Plane Strain Equibiaxial Cohesive Limit,” Philos. Mag. Lett. 76, pp. 307–314) and Gao and Klein (Gao, H., and Klein, P., 1998, “Numerical Simulation of Crack Growth in an Isotropic Solid With Randomized Internal Cohesive Bonds,” J. Mech. Phys. Solids 46(2), pp. 187–218), in order to describe material deformation and fracture under both static and dynamic loading situations. This is made possible by incorporating a cohesive type law of interaction among particles at the atomistic level into a hyperelastic framework at the continuum level. The finite element implementation of the hyperelastic VIB model in an explicit integration framework has also been successfully described in an earlier work by the authors. This paper extends the isotropic hyperelastic VIB model to ductile materials by incorporating rate effects and hardening behavior of the material into a finite deformation framework. The hyperelastic VIB model is formulated in the intermediate configuration of the multiplicative decomposition of the deformation gradient framework. The results pertaining to the deformation, stress-strain behavior, loading rate effects, and the material hardening behavior are studied for a plate with a hole problem. Comparisons are also made with the corresponding hyperelastic VIB model behavior.

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25

Fang, C. "Time-Dependent Poiseuille Flows of an Elasto-Viscoplastic Fluid with Hypoplastic Effects." Journal of Mechanics 25, no. 4 (December 2009): 421–31. http://dx.doi.org/10.1017/s1727719100002902.

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ABSTRACTAn evolution equation for the Cauchy stress tensor is proposed, taking into account the elastic, viscous and plastic characteristics of complex fluids. Hypoplasticity, in particular, is incorporated to model the plastic features. The model is applied to investigate time-dependent Poiseuille flows between two parallel plates to simulate non-Newtonian behavior of complex rheological fluids. Results show that while different degrees of elastic and viscous features can be indexed by varying the values of the model parameters, hypoplasticity is capable of simulating the plastic characteristics. The fluid tends to be divided into different parallel layers as hypoplastic effects enhance gradually. Applications of the model may be found in geomorphic fluid motions involved granular materials.

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26

KIMOTO, SAYURI, and FUSAO OKA. "AN ELASTO-VISCOPLASTIC MODEL FOR CLAY CONSIDERING DESTRUCTURALIZATION AND CONSOLIDATION ANALYSIS OF UNSTABLE BEHAVIOR." SOILS AND FOUNDATIONS 45, no. 2 (2005): 29–42. http://dx.doi.org/10.3208/sandf.45.2_29.

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27

Masson, Renaud, Mohamed El Bachir Seck, Jules Fauque, and Mihail Gărăjeu. "A modified secant formulation to predict the overall behavior of elasto-viscoplastic particulate composites." Journal of the Mechanics and Physics of Solids 137 (April 2020): 103874. http://dx.doi.org/10.1016/j.jmps.2020.103874.

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28

Abou-Chakra Guéry, A., F. Cormery, K. Su, J. F. Shao, and D. Kondo. "A micromechanical model for the elasto-viscoplastic and damage behavior of a cohesive geomaterial." Physics and Chemistry of the Earth, Parts A/B/C 33 (January 2008): S416—S421. http://dx.doi.org/10.1016/j.pce.2008.10.007.

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29

Lhadi, Safaa, Ravi raj purohit Purushottam raj purohit, Thiebaud Richeton, Nathalie Gey, Stéphane Berbenni, Olivier Perroud, and Lionel Germain. "Elasto-viscoplastic tensile behavior of as-forged Ti-1023 alloy: Experiments and micromechanical modeling." Materials Science and Engineering: A 787 (June 2020): 139491. http://dx.doi.org/10.1016/j.msea.2020.139491.

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30

Kim, Tae-Rim, Jong Ki Shin, Tae Sik Goh, Hyung-Sik Kim, Jung Sub Lee, and Chi-Seung Lee. "Modeling of elasto-viscoplastic behavior for polyurethane foam under various strain rates and temperatures." Composite Structures 180 (November 2017): 686–95. http://dx.doi.org/10.1016/j.compstruct.2017.08.032.

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31

Bernard, Chrystelle A., Joao Pedro M. Correia, Nadia Bahlouli, and Saïd Ahzi. "Numerical Simulation of Plug-Assisted Thermoforming Process: Application to Polystyrene." Key Engineering Materials 554-557 (June 2013): 1602–10. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1602.

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In the present work, the thickness distribution in a plug-assisted thermoforming process is investigated using finite element (FE) simulations. Numerical simulations have been performed with the FE code ABAQUS/Explicit. The contact between sheet and tools is considered as isothermal. Moreover, the coefficient of friction between plug and sheet is assumed constant. The behavior of the material is described by three hyperelastic laws available in the FE code. The comparison between experimental and FE results highlights that the neglected thermal effects (conduction and convection) and the thermal dependence of coefficient of friction should be considered. For future work, we propose an elasto-viscoplastic model which appears to better describe the behavior of the material than a hyperelastic model.

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32

Zaïri, Fahmi, Moussa Naït-Abdelaziz, Krzysztof Woznica, and Jean-Michel Gloaguen. "Elasto-viscoplastic constitutive equations for the description of glassy polymers behavior at constant strain rate." Journal of Engineering Materials and Technology 129, no. 1 (January 25, 2006): 29–35. http://dx.doi.org/10.1115/1.2400256.

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In this study, a modelization of the viscoplastic behavior of amorphous polymers is proposed, from an approach originally developed for metal behavior at high temperature, in which state variable constitutive equations have been modified. A procedure for the identification of model parameters is developed through the use of experimental data from both uniaxial compressive tests extracted from the literature and uniaxial tensile tests performed in this study across a variety of strain rates. The numerical algorithm shows that the predictions of this model well describe qualitatively and quantitatively the intrinsic softening immediately after yielding and the subsequent progressive orientational hardening corresponding to the response of two polymers, amorphous polyethylene terephthalate and rubber toughened polymethyl methacrylate.

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33

Gemelli, Fabrizio, Anna Corradi, Giorgio Volonté, Stefano Mantica, and Michela De Simoni. "Elasto-viscoplastic modeling of subsidence above gas fields in the Adriatic Sea." Proceedings of the International Association of Hydrological Sciences 382 (April 22, 2020): 463–67. http://dx.doi.org/10.5194/piahs-382-463-2020.

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Abstract. From the analysis of GPS monitoring data collected above gas fields in the Adriatic Sea, in a few cases subsidence responses have been observed not to directly correlate with the production trend. Such behavior, already described in the literature, may be due to several physical phenomena, ranging from simple delayed aquifer depletion to a much more complex time-dependent mechanical response of subsurface geomaterials to fluid withdrawal. In order to accurately reproduce it and therefore to be able to provide reliable forecasts, in the last years Eni has enriched its 3D finite element geomechanical modeling workflow by adopting an advanced constitutive model (Vermeer and Neher, 1999), which also considers the viscous component of the deformation. While the numerical implementation of such methodology has already been validated at laboratory scale and tested on synthetic hydrocarbon fields, the work herein presents its first application to a real gas field in the Adriatic Sea where the phenomenon has been observed. The results show that the model is capable to reproduce very accurately both GPS data and other available measurements. It is worth remarking that initial runs, characterized by the use of model parameter values directly obtained from the interpretation of mechanical laboratory tests, already provided very good results and only minor tuning operations have been required to perfect the model outcomes. Ongoing R&D projects are focused on a regional scale characterization of the Adriatic Sea basin in the framework of the Vermeer and Neher model approach.

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Ju, J. W., and Tsung-Muh Chen. "Micromechanics and Effective Elastoplastic Behavior of Two-Phase Metal Matrix Composites." Journal of Engineering Materials and Technology 116, no. 3 (July 1, 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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35

Bar-Yoseph, P., G. Yaniv, and O. Ishai. "The interdependence of hygrothermal processes and elasto-viscoplastic behavior in polymer-dominated multi-material systems." Computers & Structures 25, no. 1 (January 1987): 11–27. http://dx.doi.org/10.1016/0045-7949(87)90214-8.

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36

Li, Fu Lin, and Fang Le Peng. "FEM Simulation of Earth Pressure on Geosynthetic-Reinforced Soil Retaining Wall under Variable Rate Loading." Advanced Materials Research 594-597 (November 2012): 266–69. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.266.

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On the basis of the Dynamic Relaxation method, a nonlinear finite element method (FEM) analysis procedure was developed for the geosynthetic-reinforced soil retaining wall. The FEM procedure technique incorporated the unified three-component elasto-viscoplastic constitutive model which can consider the rate-dependent behavior of both the backfill soil and the geosynthitic reinforcement. A simulation was performed on a physical model test on geosynthetic-reinforced soil retaining wall to validate the presented FEM. Extensive finite-element analyses were carried out to investigate the earth pressure distributions from the back of retaining wall under variable rate loading. It is shown that this FEM can well simulate the rate-dependent behavior and the earth pressure of geosynthetic-reinforced soil retaining wall.

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37

Sielicki, Sumelka, and Lodygowski. "Close Range Explosive Loading on Steel Column in the Framework of Anisotropic Viscoplasticity." Metals 9, no. 4 (April 17, 2019): 454. http://dx.doi.org/10.3390/met9040454.

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The research was based on data obtained from experimental studies and aims in thechallenge of mapping these results by a mathematical (phenomenological) model. The fieldexperiments were performed on an H-section steel column supported by a reinforced concretefoundation and subjected to a close-in explosion. Numerical studies were carried out usingAbaqus/Explicit code. The user subroutine VUMAT for metallic obstacle was also implemented,together with a coupled Eulerian–Lagrangian approach. The steel column failure recorded duringreal field tests versus computational results was examined and compared. It was crucial that, fromthe computational point of view, the obstacle reflected the generalized thermo-elasto-viscoplastic(GTEV) behavior of Perzyna’s type, including an anisotropic measure of damage.

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38

UCHIDA, MAKOTO, and NAOYA TADA. "MULTISCALE COMPUTATIONAL EVALUATION OF ELASTO-VISCOPLASTIC DEFORMATION BEHAVIOR OF AMORPHOUS POLYMER CONTAINING MICROSCOPIC HETEROGENEITY DURING UNIAXIAL TENSILE TEST." Journal of Multiscale Modelling 02, no. 03n04 (September 2010): 235–55. http://dx.doi.org/10.1142/s1756973710000394.

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The two-scale elasto-viscoplastic deformation behavior of amorphous polymer was investigated using the large deformation finite element homogenization method. In order to enable a large time increment for the simulation step in the plastic deformation stage, the tangent modulus method is introduced into the nonaffine molecular chain network theory, which is used to represent the deformation behavior of pure amorphous polymer. Two kinds of heterogeneous microstructures were prepared in this investigation. One was the void model, which contains uniformly or randomly distributed voids, and the other was the heterogeneous strength (HS) model, which contains a distribution of initial shear strength. In the macroscopic scale, initiation and propagation processes of necking during uniaxial tension were considered. The macroscopic nominal stress–strain relation was strongly characterized by the volume fraction and distribution of voids for the void model and by the width of the strength distribution for the HS model. Non-uniform deformation behaviors in microscopic and macroscopic scales are closely related to each other for amorphous polymers because continuous stretching and hardening in the localized zone of the microstructure brings about an increase in macroscopic deformation resistance. Furthermore, computational results obtained from the homogenization model are compared to those obtained from the full-scale finite element model, and the effect of the scale difference between microscopic and macroscopic fields is discussed.

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39

Ali, Bassem, Marwan Sadek, and Isam Shahrour. "Elasto-viscoplastic Finite Element Analysis of the Long-term Behavior of Flexible Pavements Application to Rutting." Road Materials and Pavement Design 9, no. 3 (September 15, 2008): 463–79. http://dx.doi.org/10.3166/rmpd.9.463-479.

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40

MATSUMOTO, Ryosuke, Hiroshi KITAGAWA, Akihiro NAKATANI, and Yoshikazu HIGA. "Crack Opening Behavior in Amorphous Metal : Comparative Study of Large Scale MD and Elasto-Viscoplastic FEM." Proceedings of Conference of Kansai Branch 2002.77 (2002): _7–9_—_7–10_. http://dx.doi.org/10.1299/jsmekansai.2002.77._7-9_.

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41

IKENOYA, Kazutaka, and Nobutada OHNO. "T0101-4-1 The homogenized elasto-viscoplastic behavior of open cell structures subjected to internal pressure." Proceedings of the JSME annual meeting 2010.8 (2010): 35–36. http://dx.doi.org/10.1299/jsmemecjo.2010.8.0_35.

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42

Ishmurzin, Anton, Werner Ecker, Martin Krobath, Markus Orthaber, Stefan Marsoner, and Thomas Antretter. "The cyclic elasto-viscoplastic behavior of a high-speed steel under forging conditions - experiments and simulations." Procedia Engineering 10 (2011): 1991–96. http://dx.doi.org/10.1016/j.proeng.2011.04.330.

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43

Poulain, X., A. A. Benzerga, and R. K. Goldberg. "Finite-strain elasto-viscoplastic behavior of an epoxy resin: Experiments and modeling in the glassy regime." International Journal of Plasticity 62 (November 2014): 138–61. http://dx.doi.org/10.1016/j.ijplas.2014.07.002.

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44

Kim, Tae-Rim, and Chi-Seung Lee. "Investigation of Density- and Strain Rate-dependent Strain Hardening-softening-coupled material Behavior of Polyurethane Foams using Elasto-viscoplastic Constitutive Model." Korean Journal of Metals and Materials 58, no. 5 (May 5, 2020): 357–67. http://dx.doi.org/10.3365/kjmm.2020.58.5.357.

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Abstract:

Polyurethane foam (PUF) is one of the most well-known cellular materials and is widely employed in various industrial and biomedical fields thanks to its many advantages. These include mechanical and material characteristics such as low density and thermal conductivity, and high specific elastic modulus and strength. Despite of these advantages, the PUF has extremely complex material nonlinearity, with changes in density and strain rate, which is a major obstacle to material design and the application of PUF-based structures. PUF has elasto-viscoplastic behavior including three stages of material features, linear elasticity, softening/plateau with stress drop and densification. These phenomena depend strongly on strain rate and density. Therefore, in this study, a phenomenological constitutive model, namely, an elasto-viscoplastic model, was proposed to describe the density- and strain rate-dependent material nonlinear behavior of PUF. The yield surface-independent plastic multiplier, and the hardening- and softening-associated internal state variables proposed by Frank and Brockman, and Zairi et al. were adopted in the constitutive model, respectively. The proposed constitutive model was discretized using the implicit time integration algorithm and was implemented into a user-defined subroutine of the commercial finite element analysis program, ABAQUS. At the same time, a deterministic identification method for material parameters of the constitutive model was introduced to predict the precise material response of PUF under arbitrary densities and strain rates. To do this, the three-dimensional constitutive model was contracted to a one-dimensional equation, and the explicit equation for each material parameter was derived. Then, the strain hardening- and softeningdependent material parameters were calculated using experimental results, such as the work hardening ratestress curve and the yield stress-strain rate curve. After analyzing the obtained material parameters, it was found that the material parameters were strongly dependent on the density and the strain rate. Consequently, the macroscopic material response of PUF, such as a uniaxial compressive stress-strain curve, can be predicted based on the proposed method in this study.

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Takiguchi, Michihiro, and Fusahito Yoshida. "Effects of Loading Speed and Shear Prestrain on Adhesive Fatigue Strength in Single-Lap Joint." Key Engineering Materials 340-341 (June 2007): 1479–84. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.1479.

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The adhesive fatigue strength was investigated by performing repeated tensile lap shear experiments of an aluminum single-lap joint bonded with highly ductile acrylic adhesive. In load-controlled fatigue tests, progressive transverse shear deformation of the adhesive layer took place, and it led to the final fracture of the joint. The fatigue strength becomes higher with increasing loading speed, especially at low-cycle fatigue region. From experiments on shear-prestrained specimens, it was found that the prestrain does not affect so much the fatigue life. In order to discuss the behavior of progressive shear strain accumulation (viscoplastic ratcheting) of adhesive under cyclic loading, the numerical simulation of ratcheting was conducted using a constitutive model of elasto-viscoplasticity for the adhesive.

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Kerkour-El Miad, Aissa, and A. Kerour-El Miad. "Application of Principal Component Analysis (PCA) for the Choice of Parameters of a Micromechanical Model." Key Engineering Materials 820 (September 2019): 75–84. http://dx.doi.org/10.4028/www.scientific.net/kem.820.75.

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The main objective of this work is to apply the Principal Component Analysis (PCA) to the key parameters of a micromechanical model, namely the shape parameter of inclusion (grain) (ratio =a/b) and γ viscoplastic parameter in view of a better simulation. In this work, the sensitivity of the model to parameters and γ is evaluated on the stabilized global stress during cyclic Tension-Compression (TC) loadings and out-of-phase Tension–Torsion, with a sinusoidal waveform and a phase lag of 90 between the two sinusoidal signals TT90 loadings. Indeed several values of and γ are pulled thanks to these loading, we use later the PCA in order to choose the couple (, γ) adequate to launch our simulation. The model used is expressed as part of the self-consistent approach and time-dependent plasticity. Based on the Eshelby tensor, this model considers that the elastic behavior is compressible. For a polycrystalline structure, the grains are deformed by crystallographic sliding located in the most favorably oriented systems and which support a strong constrained stress . Keywords: PCA, grain shape , viscoplastic parameter γ, Self-consistent model, Non-incremental interaction law, Elasto-inelastic. TC and TT90 loading

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Moulai Ali, Boudjellel, El Bahri Ould Chikh, Hadj Miloud Meddah, and Bel Abbès Bachir Bouiadjra. "Plasticity Effect on the Mechanical Behavior of an Amorphous Polymer." International Journal of Engineering Research in Africa 43 (June 2019): 1–19. http://dx.doi.org/10.4028/www.scientific.net/jera.43.1.

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In the process of forming solid materials, the plastic instability phenomena often control the appearance and performance of the finished product. The study of these phenomena is therefore of great scientific and technological importance. Polymers materials, for example, polyvinyl chloride (PVC) are frequently used in the plastic pipes in pressure vessels and pipelines, which require details that are more serious, it is therefore essential to understand the mechanisms of plastic instability in polymers in order to know how to control them. In order to determine the plastic behaviour of PVC, the true stress-strain response under large plastic deformation was investigated in different stress triaxiality frameworks. A particular attention was given on the volumetric strain evolution and the damage. The effect of stress triaxiality on the fracture strain was also examined. In the second part of this paper, an elasto-viscoplastic behaviour model is presented, with non associated plasticity, damage and coalescence, which represents the observed behaviours of a PVC material under different triaxialities and for three initial void shapes

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48

Tomita, Yoshihiro. "Simulations of Plastic Instabilities in Solid Mechanics." Applied Mechanics Reviews 47, no. 6 (June 1, 1994): 171–205. http://dx.doi.org/10.1115/1.3111077.

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The purpose of the present article is provide a perspective for computational predictions related to such plastic instabilities as buckling, necking and flow localization including shear–banding under a wide range of deformation rates for a variety of materials, including single– and polycrystals. Computational bifurcation analyses for general cases, axisymmetric to nonaxisymmetric deformation, very thin–walled bodies, and specific materials with nonstandard constitutive equations are given. The postbifurcation analyses and regularization schemes to remedy the problems associated with spurious mesh sensitivity and incorrect convergence in finite element prediction of flow localization behavior are discussed. The instability behavior of thick circular tubes deformed under pressure and combined loading of internal/external pressure and axial force, neck and bulge propagations in polymeric materials, wrinkling of thin plates and shells under sheet metal forming processes, flow localization of thermo–elasto–viscoplastic materials under a wide range of deformation rates including adiabatic shear banding, and flow localization behavior of mono– and polycrystalline solids are reviewed with illustrative examples.

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TAO, Katsumi, Shigeo TAKEZONO, and Takashi ARASUNA. "Analysis of Elasto-viscoplastic Behavior in a Fixed Supported Steel Tubular Member Subjected to Impulsive Lateral Loads." Proceedings of The Computational Mechanics Conference 2000.13 (2000): 521–22. http://dx.doi.org/10.1299/jsmecmd.2000.13.521.

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Mimura, Mamoru, and Woo Young Jang. "Description of Time-Dependent Behavior of Quasi-Overconsolidated Osaka Pleistocene Clays Using Elasto-Viscoplastic Finite Element Analyses." Soils and Foundations 44, no. 4 (August 2004): 41–52. http://dx.doi.org/10.3208/sandf.44.4_41.

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