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Articles de revues sur le sujet « Viscoplastic properties »

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Auteur : Grafiati
Publié le 20 juillet 2024

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1

Valisetty, R. R., et J. L. Teply. « Overall Instantaneous Viscoplastic Properties of Composites ». Journal of Composite Materials 26, no 12 (décembre 1992) : 1708–24. http://dx.doi.org/10.1177/002199839202601201.

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2

Tarhini, Z., S. Jarny et A. Texier. « Viscoplastic properties of laponite-CMC mixes ». Data in Brief 11 (avril 2017) : 581–87. http://dx.doi.org/10.1016/j.dib.2017.02.002.

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3

Heffes, M. J., et H. F. Nied. « Analysis of Interfacial Cracking in Flip Chip Packages With Viscoplastic Solder Deformation ». Journal of Electronic Packaging 126, no 1 (1 mars 2004) : 135–41. http://dx.doi.org/10.1115/1.1649242.

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This paper examines the modeling of viscoplastic solder behavior in the vicinity of interfacial cracking for flip chip semiconductor packages. Of particular interest is the relationship between viscoplastic deformation in the solder bumps and any possible interface cracking between the epoxy underfill layer and the silicon die. A 3-D finite element code, developed specifically for the study of interfacial fracture problems, was modified to study how viscoplastic solder material properties would affect fracture parameters such as strain energy release rate and phase angle for nearby interfacial cracks. Simplified two-layer periodic symmetry models were developed to investigate these interactions. Comparison of flip chip results using different solder material models showed that viscoplastic models yielded lower stress and fracture parameters than time independent elastic-plastic simulations. It was also found that adding second level attachment greatly increases the magnitude of the solder strain and fracture parameters. As expected, the viscoplastic and temperature dependent elastic-plastic results exhibited greater similarity to each other than results based solely on linear elastic properties.
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4

Ahmadi, H. R., J. G. R. Kingston et A. H. Muhr. « Dynamic Properties of Filled Rubber — Part I : Simple Model, Experimental Data and Simulated Results ». Rubber Chemistry and Technology 81, no 1 (1 mars 2008) : 1–18. http://dx.doi.org/10.5254/1.3548196.

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Abstract A simple “viscoplastic” model is used to capture the stress-strain behavior of a filled SBR vulcanizate; a key objective is to predict dynamic properties, in particular the Fletcher-Gent or Payne effect, from non-cyclic stress-strain data. A simple fitting procedure is described to obtain the parameters of the viscoplastic model from the stress relaxation data and stress-strain loading curves at constant rate. Special attention is given to keeping the numbers of parameters and of characterization tests small. Elastic models are incapable of representing several aspects of the material behavior whereas it is confirmed that the proposed “viscoplastic” approach captures the essence of the behavior.
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5

Molinari, Alain. « Averaging Models for Heterogeneous Viscoplastic and Elastic Viscoplastic Materials ». Journal of Engineering Materials and Technology 124, no 1 (18 juin 2001) : 62–70. http://dx.doi.org/10.1115/1.1421052.

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Averaging models are proposed for viscoplastic and elastic-viscoplastic heterogeneous materials. The case of rigid viscoplastic materials is first discussed. Large deformations are considered. A first class of models is based on different linearizations of the nonlinear local response. A second class of models is obtained from approximate solutions of the nonlinear Eshelby problem. In this problem, an ellipsoid with uniform nonlinear properties is embedded in an infinite homogeneous matrix. An approximate solution is obtained by approaching the matrix behavior with an affine response. Using this solution of the nonlinear Eshelby problem, the average strain rate is calculated in each phase of the composite material, each phase being represented by an ellipsoid embedded in an infinite reference medium. By adequate choices of the reference medium, different averaging models are obtained (self-consistent scheme, nonlinear Mori Tanaka model…). Finally, elasticity is included in the modelling, but with a restriction to small deformations.
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6

Jalaal, Maziyar, Dave Kemper et Detlef Lohse. « Viscoplastic water entry ». Journal of Fluid Mechanics 864 (11 février 2019) : 596–613. http://dx.doi.org/10.1017/jfm.2019.32.

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The impact of viscoplastic droplets on a free surface of water is studied. The droplet undergoes an elasto-plastic deformation at the early stages of water entry. At large time, the yield stress dominates; therefore, the droplet solidifies and reaches an equilibrium shape. Depending on the impact velocity and the rheology of the droplet, the final morphologies vary from pear-shaped to capsules that contain bubbles. We perform an analysis of the orders of magnitude of the forces and introduce the relevant dimensionless groups. Furthermore, we categorize the final shapes in a phase diagram and analyse their geometrical properties. The process presents a method of making non-spherical beads and capsules with tunable shapes and provides information on the general problem of the impact of highly deformable objects on a liquid surface.
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7

Huber, N., et E. Tyulyukovskiy. « A new loading history for identification of viscoplastic properties by spherical indentation ». Journal of Materials Research 19, no 1 (janvier 2004) : 101–13. http://dx.doi.org/10.1557/jmr.2004.19.1.101.

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In this paper a new loading history for extracting the stress–strain curve as well as the viscosity and creep behavior from indentation experiments is developed. It is based on a simple model describing the viscoplastic spherical indentation with a power-law hardening rule and a velocity-dependent overstress. Using this model, patterns were generated consisting of load-depth data and corresponding material parameters. The loading history for the simulation of the patterns was considered as a variable combination of loading and creep processes. To compare the identification potential of different loading histories, the inverse problem of determining the viscoplastic material parameters was solved by using neural networks. The emerging loading history uses a multiple-creep process with equidistant load steps and allows an identification of material parameters with much higher accuracy than with single creep. It will be used for further work, where the identification method is generalized using more realistic finite element simulations for a finite deformation elastic–viscoplastic material behavior.
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8

Fotiu, Peter A., et Sia Nernat-Nasser. « Overall properties of elastic-viscoplastic periodic composites ». International Journal of Plasticity 12, no 2 (janvier 1996) : 163–90. http://dx.doi.org/10.1016/s0749-6419(96)00002-2.

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9

Giginyak, F. F., T. N. Mozharovskaya et V. V. Bashta. « Assessment of Viscoplastic Properties of Titanium Alloys ». Strength of Materials 37, no 3 (mai 2005) : 254–59. http://dx.doi.org/10.1007/s11223-005-0037-7.

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10

Vincent, Y., J. M. Bergheau, J. B. Leblond et J.-F.Jullien. « An experimental mock-up for the study of steel behaviour at high temperature during phase transformation ». Journal de Physique IV 120 (décembre 2004) : 161–68. http://dx.doi.org/10.1051/jp4:2004120018.

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In most numerical simulations of welding, due to the very short times involved, viscoplastic effects are neglected. However an experimental mock-up developed at INSA has evidenced the possible importance of such effects, which must therefore be incorporated in a more refined description of the material behaviour. This paper presents such a description; an extension of Leblond’s model for transformation plasticity, accounting for the dependence of mechanical properties upon strain rate, is proposed. Finite element analyses using elastic-plastic or elastic-viscoplastic constitutive laws are compared with experiments, and it is found that incorporation of viscoplastic effects significantly improves the quality of the agreement between numerical and experimental results.
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11

Zhang, Yuqing, Fan Gu, Bjorn Birgisson et Robert L. Lytton. « Viscoelasticplastic–Fracture Modeling of Asphalt Mixtures Under Monotonic and Repeated Loads ». Transportation Research Record : Journal of the Transportation Research Board 2631, no 1 (janvier 2017) : 20–29. http://dx.doi.org/10.3141/2631-03.

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Rutting and cracking occur simultaneously in asphalt mixtures as observed in the field and in the laboratory. Existing mechanical models have not properly addressed viscoelastic and viscoplastic deformation together with cracking attributable to model deficiencies, parameter calibration, and numerical inefficiency. This study developed viscoelasticplastic–fracture (VEPF) models for the characterization of viscoelasticity by Prony model and viscoplasticity by Perzyna’s flow rule with a generalized Drucker–Prager yield surface and a nonassociated plastic potential. Viscofracture damage was modeled by a viscoelastic Griffith criterion and a pseudo J-integral Paris’s law for crack initiation and propagation, respectively. The VEPF models were implemented in a finite element program by using a weak form partial differential equation modeling technique without the need for programming user-defined material subroutines. Model parameters were derived from fundamental material properties by using dynamic modulus, strength, and repeated load tests. Simulations indicated that the viscoelastic–viscoplastic–viscofracture characteristics were effectively modeled by the VEPF models for asphalt mixtures at different confinements and temperatures. An asphalt mixture under monotonic compressive loads exhibited a sequenced process including a pure viscoelastic deformation stage, a coupled viscoelastic–viscoplastic deformation stage, a viscoelastic–viscoplastic deformation coupled with a viscofracture initiation and a propagation stage, and then a viscoelastic–viscofracture rupture stage with saturated viscoplastic deformation. The asphalt mixture under repeated loads yielded an increasing viscoplastic strain at an increasing rate during the first half of the haversine load, while the increment of the viscoplastic strain (per load cycle) decreased with load cycles. The finite element program, which is based on a partial differential equation, effectively modeled the coupled viscoelastic–viscoplastic–viscofracture behaviors of the asphalt mixtures.
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12

Song, Yongjun, Leitao Zhang, Huimin Yang, Jianxi Ren et Yongxin Che. « Experimental Study on the Creep Behavior of Red Sandstone under Low Temperatures ». Advances in Civil Engineering 2019 (9 octobre 2019) : 1–9. http://dx.doi.org/10.1155/2019/2328065.

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In cold regions, the deformation characteristics and long-term mechanical properties of rocks under low-temperature conditions are considerably different from those in other regions. To study the deformation characteristics and long-term mechanical properties of rocks in a low-temperature environment and the effect of different temperatures, we perform a multilevel loading-unloading uniaxial creep test on red sandstone samples and obtain the creep curves at different temperatures (20°C, −10°C, and −20°C). The results demonstrate that the total strain at each temperature can be divided into instantaneous and creep strains; the instantaneous strain includes instantaneous elastic and plastic strains, and the creep strain includes viscoelastic and viscoplastic strains. Temperature has a significant effect on the deformation properties of red sandstone. A decrease in temperature reduces the instantaneous and creep deformations of the rocks at all levels of stress. In addition, a decrease in temperature exponentially attenuates the total creep and viscoplastic strains of the rocks. 0°C is a critical point for the reduction of the total creep and viscoplastic strains of the rocks. When the temperature is greater than 0°C, the total creep and viscoplastic strains of the rocks decrease rapidly and linearly with decrease in temperature; however, when the temperature is less than 0°C, the decrease in the total creep and viscoplastic strains of the rocks is slow. The steady-state creep rate of the rock samples decreases with decrease in temperature, whereas the creep duration increases with decrease in temperature, especially in the case of the accelerated creep stage. The accelerated creep durations of the rock samples S4 (20°C) and S7 (–10°C) are 0.07 h and 0.23 h, respectively.
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13

Koda, Takayuki, et Tetsuya Matsuda. « Analysis of Elastic-Viscoplastic Behavior of Honeycomb Sandwich Panels Based on a Homogenization Theory for Free Edge Analysis ». Key Engineering Materials 535-536 (janvier 2013) : 357–60. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.357.

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In this study, the elastic-viscoplastic properties of aluminum honeycomb sandwich panels are investigated using a homogenization theory for free edge analysis. For this, the mathematical homogenization theory is reconstructed for elastic-viscoplastic analysis of honeycomb sandwich panels by introducing a traction free boundary condition. Moreover, the domain of analysis is reduced to a quarter using point-symmetry of internal structures of honeycomb sandwich panels. The present method is then applied to the analysis of macroscopic elastic-viscoplastic behavior and microscopic stress distribution of an aluminum honeycomb sandwich panel subjected to in-plane uniaxial compression. It is shown that the stress concentration arises at face/core interfaces, especially at intersections of core walls.
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14

Wang, Jing Yin, et Fang Liu. « Thermodynamic Properties of Soft Sedimentary Rock in Geotechnical Engineering ». Applied Mechanics and Materials 170-173 (mai 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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15

Eremin, A. Ya, V. V. Kuprygin et Ya B. Kukolev. « Viscoplastic properties of binary and multicomponent coal blends ». Coke and Chemistry 59, no 3 (mars 2016) : 69–73. http://dx.doi.org/10.3103/s1068364x16030042.

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16

NOGAWA, Naoto, Masahiro ARAI, Keita GOTO et Takashi ISHIKAWA. « Evaluation of thermo-elasto-viscoplastic properties of CFRTP ». Proceedings of the Materials and Mechanics Conference 2016 (2016) : OS12–04. http://dx.doi.org/10.1299/jsmemm.2016.os12-04.

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17

Gauthier, C., J. M. Pelletier, Q. Wang et J. J. Blandin. « Viscoelastic and viscoplastic properties of bulk metallic glasses ». Journal of Non-Crystalline Solids 345-346 (octobre 2004) : 469–72. http://dx.doi.org/10.1016/j.jnoncrysol.2004.08.067.

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18

Moran, K., A. Yeung et J. Masliyah. « The viscoplastic properties of crude oil–water interfaces ». Chemical Engineering Science 61, no 18 (septembre 2006) : 6016–28. http://dx.doi.org/10.1016/j.ces.2006.05.026.

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19

Lu, Qiong, Chi Zhang, Wei Wang, Shuai Jiang, Lee Aucott, Tabassam Yasmeen et Jun Jiang. « Reveal the Viscoplastic Behaviour and Microstructure Evolution of Stainless Steel 316L ». Materials 15, no 20 (11 octobre 2022) : 7064. http://dx.doi.org/10.3390/ma15207064.

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Stainless steel 316L is a widely used structural material in the nuclear industry because of its excellent corrosion resistance and mechanical properties. However, very little research can be found on its viscoplastic behaviour and microstructure evolution at warm and hot deformation conditions, which hinder the possible application of advanced manufacturing technologies for producing complex parts, such as superplastic forming or hydroforming. The aims of this study are to explore stainless steel 316L’s viscoplastic behaviour, to determine its strain rate sensitivities, and to reveal its underlying microstructure evolution; this will allow appropriate manufacturing (forming) technologies and the optimal forming condition to be determined. Hence, isothermal tensile tests at 700 °C, 800 °C, 900 °C, and 1000 °C at strain rates of 0.01 s−1 and 0.001 s−1 have been conducted. Moreover, the corresponding microstructure evolution, including the grain orientation and geometrically necessary dislocation density, has been revealed by the electron backscatter diffraction method. The data show the viscoplastic behaviour of stainless steel 316L under various thermomechanical deformation conditions and how microstructure evolution influences the viscoplastic flow stress.
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20

Paska, Zbynek, Radim Halama, Petr Dymacek, Bhuvanesh Govindaraj et Jaroslav Rojicek. « Comparison of Tensile and Creep Properties of SAC305 and SACX0807 at Room Temperature with DIC Application ». Applied Sciences 14, no 2 (10 janvier 2024) : 604. http://dx.doi.org/10.3390/app14020604.

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The contribution presents the verification of the methodology of accelerated creep tests from the point of view of obtaining more information about the stress–strain behaviour of the investigated materials using the Digital Image Correlation method. Creep tests are performed on SAC305 and SACX0807 lead-free solders and are supplemented by numerical modelling using the finite element method, considering the viscoplastic model based on the theory of Perzyna, Chaboche, and Norton. The stress–strain behaviour of both solders appears to be very similar at applied strain rates of 0.0002–0.0026%/s and applied creep stresses of 15–28 MPa. Initially, the viscoplastic model is calibrated using an analytical approach. Then, the finite element model updating approach is used to optimise the material parameters based on the simultaneous simulations of creep and tensile tests. As a result, the total objective function value is reduced almost five times due to optimisation. The proposed type of accelerated test with an hourglass specimen proves to be suitable for calibrating the considered class of viscoplastic models. The main benefit is that a single specimen is required to obtain creep curves on various stress levels.
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21

Li, Sheng-Nan, Zhu Peng, Zhong-Hua Huang, Qiao Liang, Jie Liu et Wen-Quan Zhou. « Time-Dependent Deformation and Long-Term Strength of Carbonaceous Mudstone under Dry and Wet Cycles ». Sustainability 14, no 19 (23 septembre 2022) : 12044. http://dx.doi.org/10.3390/su141912044.

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Clarifying the time-dependent strength deterioration characteristics of carbonaceous mudstone under dry and wet cycles is of great significance to the design of expressway cut slopes. In this work, we conducted triaxial compression creep tests on carbonaceous mudstone specimens that had undergone different numbers of dry and wet cycles to investigate their creep properties. A function was established between the steady-state viscoplastic creep rate and axial compression. The threshold stress of the steady-state viscoplastic creep rate was assumed as the long-term strength, and the long-term strength deterioration law of carbonaceous mudstone under dry and wet cycles was studied. The results showed that the transient strain, viscoelastic creep, and viscoplastic creep of carbonaceous mudstone increased with the number of dry and wet cycles, and the creep failure stress and transient elasticity modulus decreased. Based on the steady-state viscoplastic creep rate method, the long-term strength of carbonaceous mudstone after n (n = 0, 3, 6, 9) dry and wet cycles was found to be 74.25%, 64.88%, 57.56%, and 53.16% of its uniaxial compression strength, respectively. Compared with the isochronous curve method and the transition creep method, the steady-state viscoplastic creep rate method can more accurately determine the long-term rock strength. The long-term strength of carbonaceous mudstone under dry and wet cycles decays exponentially, and the long-term strength decay rate during the first three dry and wet cycles is about 215 times the average decay rate.
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22

Salavatov, T. ShJ, M. A. Dadash-zade et T. S. Babayeva. « Research of rheological properties elastic-viscoplastic liquid in pipes ». Herald of the Azerbaijan Engineering Academy 14, no 1 (2022) : 70–74. http://dx.doi.org/10.52171/2076-0515_2022_14_01_70_74.

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23

Pokorska, I. « Viscoplastic properties of pure iron, copper and aluminium powders ». Powder Metallurgy 51, no 4 (décembre 2008) : 361–67. http://dx.doi.org/10.1179/174329008x286677.

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24

Liang, Wen Yan, Zhen Qing Wang et Hong Qing Lv. « The Elastic-Viscoplastic Field Near Mode II Dynamic Propagating Crack-Tip of Interface in Double Dissimilar Materials ». Advanced Materials Research 97-101 (mars 2010) : 625–28. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.625.

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The existence of viscosity effect at the interface of double dissimilar materials has an important impact to the distribution of interface crack-tip field and the properties variety of the interface itself. The singular is considered in crack-tip, and the elastic-viscoplastic governing equations of double dissimilar materials at quasi-static propagating interface crack-tip field are established. The displacement potential function and boundary condition of interface crack-tip are introduced, and the numerical analysis of rigid-elastic viscoplastic interface for mode II are worked out. The stress-strain fields are obtained at the crack-tip and the variations of solutions are discussed according to each parameter. The numerical results show that the viscosity effect is a main factor of interface propagating crack-tip field, and the interface crack-tip is a viscoplastic field that is governed by viscosity coefficient、Mach number and singular factor.
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25

Liang, Wen Yan, Zhen Qing Wang et Hong Qing Lv. « The Steady-State Growing Crack-Tip Field Characteristics of Mode I Elastic-Viscoplastic/Rigid Interface Cracks ». Key Engineering Materials 452-453 (novembre 2010) : 113–16. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.113.

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The existence of viscosity effect at the interface of double dissimilar materials has an important impact to the distribution of interface crack-tip field and the properties variety of the interface itself. The singularity and viscosity are considered in crack-tip, and the elastic-viscoplastic governing equations of double dissimilar materials at interface crack-tip field are established. The displacement potential function and boundary condition of interface crack-tip are introduced, and the numerical analysis of elstic-viscoplastic/rigid interface for mode I are worked out. The stress-strain fields are obtained at the crack-tip and the variation rules of solutions are discussed according to each parameter. The numerical results show that the viscosity effect is a main factor of interface propagating at crack-tip field, and the interface crack-tip is a viscoplastic field that is governed by viscosity coefficient、Mach number and singularity exponent.
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26

Sepiani, Hossein, Maria Anna Polak et Alexander Penlidis. « Finite element implementation of viscoelastic and viscoplastic models ». Engineering Computations 37, no 8 (16 mars 2020) : 2561–85. http://dx.doi.org/10.1108/ec-02-2019-0062.

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Purpose The purpose of this study is to present a finite element (FE) implementation of phenomenological three-dimensional viscoelastic and viscoplastic constitutive models for long term behaviour prediction of polymers. Design/methodology/approach The method is based on the small strain assumption but is extended to large deformation for materials in which the stress-strain relation is nonlinear and the concept of incompressibility is governing. An empirical approach is used for determining material parameters in the constitutive equations, based on measured material properties. The modelling process uses a spring and dash-pot and a power-law approximation function method for viscoelastic and viscoplastic nonlinear behaviour, respectively. The model improvement for long term behaviour prediction is done by modifying the material parameters in such a way that they account for the current test time. The determination of material properties is based on the non-separable type of relations for nonlinear materials in which the material properties change with stress coupled with time. Findings The proposed viscoelastic and viscoplastic models are implemented in a user material algorithm of the FE general-purpose program ABAQUS and the validity of the models is assessed by comparisons with experimental observations from tests on high-density polyethylene samples in one-dimensional tensile loading. Comparisons show that the proposed constitutive model can satisfactorily represent the time-dependent mechanical behaviour of polymers even for long term predictions. Originality/value The study provides a new approach in long term investigation of material behaviour using FE analysis.
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Cui, Yehui, Xiangguo Zeng, Junfeng Xiao et Huayan Chen. « A non-unified viscoplastic constitutive model based on irreversible thermodynamics and creep-fatigue life prediction for Type 316 stainless ». Materials Research Express 9, no 3 (1 mars 2022) : 036511. http://dx.doi.org/10.1088/2053-1591/ac5b48.

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Abstract In this work, to describe the cycle behavior considering fatigue-creep interaction, a non-unified viscoplastic constitutive model for 316 stainless steel is derived within the irreversible thermodynamic framework. The internal variables considering kinematic and isotropic hardening properties are selected to construct the evolution equation of visco-plastic and creep terms. The proposed constitutive model was validated by the comparison with the existing literature. It was manifested that this constitutive model could successfully predict the hardening behavior and stress relaxation process under the cyclic loading. During the dwell period, the increment of the inelastic strain is decomposed into the viscoplastic and creep term. The viscoplastic deformation dominates first stage of the stress relaxation, while the stable stage is controlled by the creep term. Finally, the predicted values of mean stress are taken into the Manson-Coffin law, the low cycle fatigue life prediction are carried out based on the numerical model, which showed robust correlation with experimental results.
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HUANG, J., J. Q. ZHANG et J. N. LIU. « EFFECT OF MAGNETIC FIELD ON PROPERTIES OF MR FLUIDS ». International Journal of Modern Physics B 19, no 01n03 (30 janvier 2005) : 597–601. http://dx.doi.org/10.1142/s0217979205029122.

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The yield stress is one of the most important parameters that characterize viscoplastic properties of magnetorheological (MR) fluids. Based on the microstructure of magnetic-chain a theoretical model is developed to analyze the effect of the applied magnetic field on the yield stress. It has been shown that the values of the yield stress calculated by the model agree well with the experimental data.
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Kaleta, Jerzy, Daniel Lewandowski et Piotr Zając. « Experimental Identification of Magnetorheological Composites and Elastomers Properties ». Materials Science Forum 482 (avril 2005) : 403–6. http://dx.doi.org/10.4028/www.scientific.net/msf.482.403.

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The paper presents measurement and results of mathematical modelling of damping in cyclic loaded magnetorheological composites - MRC. The original experimental set-up for cyclic shearing mode has been created. Examples of possible applications, measurement and processing mechanical signals (shear stress - T, deformation - g) and magnetic signals (strength of magnetic field - H) were provided. For the modelling four-parameters viscoelastic-viscoplastic model was chosen. Result of identification confirmed an appropriate choice of the model.
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30

Antoš, Daniel, Radim Halama et Matěj Bartecký. « Cyclic Plastic Properties of a Lead Free Solder ». Key Engineering Materials 810 (juillet 2019) : 46–51. http://dx.doi.org/10.4028/www.scientific.net/kem.810.46.

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This paper shows some cyclic plastic properties of the lead free solder alloy Sn-3.5Ag-0.75 under fully reversed cyclic torsional loading. The low-cycle fatigue behavior of the material was evaluated too. The lead free solder material reveals a strong strain rate effect. A viscoplastic model was implemented into a commercial finite element program and calibrated using data from literature to can be used for simulations of all performed tests in a future work.
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Szymczyk, Michał, Marcin Nowak et Wojciech Sumelka. « Numerical Study of Dynamic Properties of Fractional Viscoplasticity Model ». Symmetry 10, no 7 (13 juillet 2018) : 282. http://dx.doi.org/10.3390/sym10070282.

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The fractional viscoplasticity (FV) concept combines the Perzyna type viscoplastic model and fractional calculus. This formulation includes: (i) rate-dependence; (ii) plastic anisotropy; (iii) non-normality; (iv) directional viscosity; (v) implicit/time non-locality; and (vi) explicit/stress-fractional non-locality. This paper presents a comprehensive analysis of the above mentioned FV properties, together with a detailed discussion on a general 3D numerical implementation for the explicit time integration scheme.
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32

Chen, X., I. A. Ashcroft, R. D. Wildman et C. J. Tuck. « An inverse method for determining the spatially resolved properties of viscoelastic–viscoplastic three-dimensional printed materials ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 471, no 2183 (novembre 2015) : 20150477. http://dx.doi.org/10.1098/rspa.2015.0477.

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A method using experimental nanoindentation and inverse finite-element analysis (FEA) has been developed that enables the spatial variation of material constitutive properties to be accurately determined. The method was used to measure property variation in a three-dimensional printed (3DP) polymeric material. The accuracy of the method is dependent on the applicability of the constitutive model used in the inverse FEA, hence four potential material models: viscoelastic, viscoelastic–viscoplastic, nonlinear viscoelastic and nonlinear viscoelastic–viscoplastic were evaluated, with the latter enabling the best fit to experimental data. Significant changes in material properties were seen in the depth direction of the 3DP sample, which could be linked to the degree of cross-linking within the material, a feature inherent in a UV-cured layer-by-layer construction method. It is proposed that the method is a powerful tool in the analysis of manufacturing processes with potential spatial property variation that will also enable the accurate prediction of final manufactured part performance.
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33

Zhang, Chuang, Jian-Zhong Li et Yong He. « Experimental Study on Viscoplastic Property of Unsaturated Reticulate Red Clay Used as an Engineered Barrier ». Geofluids 2020 (1 septembre 2020) : 1–13. http://dx.doi.org/10.1155/2020/1523659.

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In this study, to explore the feasibility of a compacted red clay as an engineered barrier in landfills, the viscoplastic property of remodeled unsaturated reticulate red clay was studied through a series of triaxial tests. According to the deviatoric stress–axial strain curves obtained through loading tests with varying strain rates and under different conditions, the viscoplastic parameter β of remodeled reticulate red clay was obtained. The effects of different matric suctions and net confining pressures on the viscoplasticity of unsaturated reticulate clay were analyzed. The test results showed that remodeled reticulate red clays with different degrees of saturation have similar viscoplastic properties, and their stress–strain curves are all isotach. The stiffness of unsaturated reticulate red clay increased with increasing confining pressure and matric suction. The relationship between β and the net confining pressure can be described using a linear equation. The β value of the specimens increased with increasing matric suction under a constant net confining pressure. A similar linear relationship was observed between β and the matric suction. These relationships are explained considering the loading rate effect mechanism.
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34

Kim, Jinkyu, et Dongkeon Kim. « Temporal finite element methods through the extended framework of Hamilton’s principle ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 231, no 2 (9 août 2016) : 263–78. http://dx.doi.org/10.1177/0954406216642481.

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With basic ideas of mixed Lagrangian formulation and sequential assigning process for initial conditions, the extended framework of Hamilton’s principle (EHP) was recently developed for continuum dynamics. Unlike the original Hamilton’s principle, this new variational framework can fully take initial conditions into account for both linear and nonlinear dynamics, so that it provides a sound base to apply a finite element scheme over the temporal domain without any ambiguity. This paper describes temporal finite element approach stemming from the extended Hamilton’s principle, which focuses initially on classical single-degree-of-freedom oscillators such as Kelvin–Voigt damped oscillator and an elasto-viscoplastic model. In each case, an appropriate weak form is provided and a corresponding formulation is discretized in the temporal domain with the adoption of Galerkin’s method. Basic numerical properties are investigated for the developed numerical algorithms with several computational examples for the elasto-viscoplastic model. For the underlying conservative system, the present method is symplectic and unconditionally stable with respect to the time step. On the other hand, the method provides unconditionally stable and noniterative algorithm for the elasto-viscoplastic model.
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35

Ohno, Nobutada, et Xu Wu. « Homogenized properties of elastic-viscoplastic composites with periodic internal structures ». Metals and Materials 4, no 3 (mai 1998) : 269–74. http://dx.doi.org/10.1007/bf03187775.

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36

Voronin, G. V., S. Y. Petrov, I. A. Novikov et A. A. Elsangahawi. « Experimental evaluation of the viscoplastic properties of the iris tissue ». POINT OF VIEW. EAST – WEST, no 3 (1 juillet 2020) : 23–25. http://dx.doi.org/10.25276/2410-1257-2020-3-23-25.

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37

Lott-Crumpler, D. A. « The formation and properties of shear bands in viscoplastic materials ». Modelling and Simulation in Materials Science and Engineering 5, no 4 (1 juillet 1997) : 317–36. http://dx.doi.org/10.1088/0965-0393/5/4/002.

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38

van der Sluis, O., P. J. G. Schreurs et H. E. H. Meijer. « Effective properties of a viscoplastic constitutive model obtained by homogenisation ». Mechanics of Materials 31, no 11 (novembre 1999) : 743–59. http://dx.doi.org/10.1016/s0167-6636(99)00028-9.

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39

Leslie, D., A. Dasgupta et Carlos Morillo. « Viscoplastic properties of pressure-less sintered silver materials using indentation ». Microelectronics Reliability 74 (juillet 2017) : 121–30. http://dx.doi.org/10.1016/j.microrel.2017.04.009.

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40

Ohno, N., X. Wu et T. Matsuda. « Homogenized properties of elastic–viscoplastic composites with periodic internal structures ». International Journal of Mechanical Sciences 42, no 8 (août 2000) : 1519–36. http://dx.doi.org/10.1016/s0020-7403(99)00088-0.

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41

Gelin, J. C., et O. Ghouati. « An inverse method for determining viscoplastic properties of aluminium alloys ». Journal of Materials Processing Technology 45, no 1-4 (septembre 1994) : 435–40. http://dx.doi.org/10.1016/0924-0136(94)90378-6.

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42

Inoue, Noriyuki, Akio Yonezu, Yousuke Watanabe, Takeo Okamura, Kouji Yoneda et Baoxing Xu. « Prediction of viscoplastic properties of polymeric materials using sharp indentation ». Computational Materials Science 110 (décembre 2015) : 321–30. http://dx.doi.org/10.1016/j.commatsci.2015.08.033.

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43

Bouali, A., et C. Tete. « Viscoplastic properties of an FeCrPC amorphous alloy ». Materials Science and Engineering 97 (janvier 1988) : 493–96. http://dx.doi.org/10.1016/0025-5416(88)90100-0.

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Giginyak, F. F., A. A. Lebedev, V. V. Bashta, A. V. Getmanchuk et V. F. Titov. « Viscoplastic properties of steel 10GN2MFA with a complex stressed state ». Strength of Materials 26, no 4 (avril 1994) : 265–69. http://dx.doi.org/10.1007/bf02207405.

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45

Zhang, Qian, Abhijit Dasgupta et Peter Haswell. « Partitioned viscoplastic-constitutive properties of the Pb-free Sn3.9Ag0.6Cu solder ». Journal of Electronic Materials 33, no 11 (novembre 2004) : 1338–49. http://dx.doi.org/10.1007/s11664-004-0163-1.

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46

Sone, Hiroki, et Mark D. Zoback. « Mechanical properties of shale-gas reservoir rocks — Part 2 : Ductile creep, brittle strength, and their relation to the elastic modulus ». GEOPHYSICS 78, no 5 (1 septembre 2013) : D393—D402. http://dx.doi.org/10.1190/geo2013-0051.1.

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We studied the elastic moduli, ductile creep behavior, and brittle strength of shale-gas reservoir rocks from Barnett, Haynesville, Eagle Ford, and Fort St. John shale in a series of triaxial laboratory experiments. We found a strong correlation between the shale compositions, in particular, the volume of clay plus kerogen and intact rock strength, frictional strength, and viscoplastic creep. Viscoplastic creep strain was approximately linear with the applied differential stress. The reduction in sample volume during creep suggested that the creep was accommodated by slight pore compaction. In a manner similar to instantaneous strain, there was more viscoplastic creep in samples deformed perpendicular to the bedding than parallel to the bedding. The tendency to creep also correlated well with the static Young’s modulus. We explained this apparent correlation between creep behavior and elastic modulus by appealing to the stress partitioning that occurs between the soft components of the shales (clay and kerogen) and the stiff components (quartz, feldspar, pyrite, and carbonates). Through a simple 1D analysis, we found that a unique relation between the creep compliance and elastic modulus, independent of composition and orientation, can be established by considering the individual creep behavior of the soft and stiff components that arises from the stress partitioning within the rock. This appears to provide a mechanical explanation for why long-term ductile deformational properties can appear to correlate with short-term elastic properties in shale-gas reservoir rocks.
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47

Rudyak V. Ya., Dashpilov G. R., Minakov A. V. et Pryazhnikov M. I. « Viscoelastic properties of nanofluids with carbon tubes ». Technical Physics Letters 48, no 7 (2022) : 43. http://dx.doi.org/10.21883/tpl.2022.07.54037.19232.

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The method of diffusion wave spectroscopy is used to study the microrheology of several nanofluids based on water, ethylene glycol and isopropyl alcohol with single-wall and multi-wall nanotubes. Their viscosity and rheology have been previously investigated, and it has been shown that, starting with a certain concentration of carbon nanotubes, nanofluids are non-Newtonian and viscoplastic. At the same time, it was experimentally established that these nanofluids are viscoelastic. Various viscoelastic characteristics of these nanofluids have been systematically studied and compared. Keywords: viscoelasticity, nanofluid, microrheology, carbon nanotubes.
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48

Traidi, Khalil, Véronique Favier, Philippe Lestriez, Karl Debray, Laurent Langlois et Tudor Balan. « Modelling Semi-Solid Behaviour and Brittle Temperature Range ». Solid State Phenomena 285 (janvier 2019) : 361–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.361.

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In this paper, a new elastic viscoplastic micromechanical modelling is proposed to represent the semi-solid behaviour and predict the ductile-brittle transition of the C38LTT near the solidus. It is based on a viscoplastic modelling previously presented in [1]. The originality of the new model comes from three main enhancements: the transition between the solid state and the semi-solid state was included meaning that the material properties were taken temperature-dependent, the elastic properties was taken into account similarly as [2] and the evolution of the internal variable describing the degree of agglomeration of the solid phase was enhanced. The model was implemented in the commercial software FORGE©. Tensile tests representing the experimental thermal conditions and obtained using a GLEEBLE© machine were simulated. The comparison of the predicted and experimental results shows that, for the first time to our knowledge, the three steps of the load-displacement response and ductile-brittle transition were successfully described.
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49

Zengaffinen, T., F. Løvholt, G. K. Pedersen et C. B. Harbitz. « Effects of rotational submarine slump dynamics on tsunami genesis : new insight from idealized models and the 1929 Grand Banks event ». Geological Society, London, Special Publications 500, no 1 (2020) : 41–61. http://dx.doi.org/10.1144/sp500-2019-201.

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AbstractSediment slumps are known to have generated important tsunamis such as the 1998 Papua New Guinea (PNG) and the 1929 Grand Banks events. Tsunami modellers commonly use solid blocks with short run-out distances to simulate these slumps. While such methods have the obvious advantage of being simple to use, they offer little or no insight into physical processes that drive the events. The importance of rotational slump motion to tsunamigenic potential is demonstrated in this study by employing a viscoplastic landslide model with Herschel–Bulkley rheology. A large number of simulations for different material properties and landslide configurations are carried out to link the slump's deformation, rheology, its translational and rotational kinematics, to its tsunami genesis. The yield strength of the slump is shown to be the primary material property that determines the tsunami genesis. This viscoplastic model is further employed to simulate the 1929 Grand Banks tsunami using updated geological source information. The results of this case study suggest that the viscoplastic model can be used to simulate complex slump-induced tsunami. The simulations of the 1929 Grand Banks event also indicate that a pure slump mechanism is more tsunamigenic than a corresponding translational landslide mechanism.
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Kim, Kang Hyun, Hyeonil Park, Dong Jun Lee, Yong Nam Kwon, Namhyun Kang et Jong-Hwa Hong. « One-Step Hybrid Bending/Diffusion Bonding Process and Analysis of the Bonding Characteristics of Titanium Alloy Sheets ». Materials 16, no 13 (21 juin 2023) : 4516. http://dx.doi.org/10.3390/ma16134516.

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A one-step hybrid bending/diffusion bonding process (HB/DBP) was developed for application to Ti-6Al-4V sheets to effectively improve buy-to-fly (BTF) ratio of aircraft parts, integrating sequential diffusion bonding followed by a bending process. The resulting bonding characteristics of these titanium alloy sheets were analyzed. Microstructural analysis and mechanical lap shear tests were performed to estimate the bonding quality. Additionally, bonding ratio, thickness strain, and shear strength were evaluated in relation to pressure under increasing temperature. When the applied pressure was lower than 0.5 MPa, early failure occurred at the joint of the specimens. However, when high pressure was applied, early failure occurred near the joint. To discuss the phenomenon, time-dependent viscoplastic material properties were characterized, and a numerical simulation analysis was performed. Viscoplastic deformation was observed around the bending area, which caused weakness around the bond under high-pressure conditions. A prototype of a Y-shaped heat shield was manufactured and the buy-to-fly ratio was effectively improved using the newly developed process. This study demonstrates the potential of applying the developed process for producing aircraft parts and the importance of viscoplastic behavior for the analysis of final product reliability.
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