Gotowe bibliografie tematyczne / Viscoplastic properties

Gotowa bibliografia na temat „Viscoplastic properties”

Autor: Grafiati

Data publikacji: 20 lipca 2024

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Artykuły w czasopismach na temat "Viscoplastic properties"

Valisetty, R. R., i J. L. Teply. "Overall Instantaneous Viscoplastic Properties of Composites". Journal of Composite Materials 26, nr 12 (grudzień 1992): 1708–24. http://dx.doi.org/10.1177/002199839202601201.

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

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Heffes, M. J., i H. F. Nied. "Analysis of Interfacial Cracking in Flip Chip Packages With Viscoplastic Solder Deformation". Journal of Electronic Packaging 126, nr 1 (1.03.2004): 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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Ahmadi, H. R., J. G. R. Kingston i A. H. Muhr. "Dynamic Properties of Filled Rubber — Part I: Simple Model, Experimental Data and Simulated Results". Rubber Chemistry and Technology 81, nr 1 (1.03.2008): 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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Molinari, Alain. "Averaging Models for Heterogeneous Viscoplastic and Elastic Viscoplastic Materials". Journal of Engineering Materials and Technology 124, nr 1 (18.06.2001): 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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Jalaal, Maziyar, Dave Kemper i Detlef Lohse. "Viscoplastic water entry". Journal of Fluid Mechanics 864 (11.02.2019): 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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Huber, N., i E. Tyulyukovskiy. "A new loading history for identification of viscoplastic properties by spherical indentation". Journal of Materials Research 19, nr 1 (styczeń 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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Fotiu, Peter A., i Sia Nernat-Nasser. "Overall properties of elastic-viscoplastic periodic composites". International Journal of Plasticity 12, nr 2 (styczeń 1996): 163–90. http://dx.doi.org/10.1016/s0749-6419(96)00002-2.

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Giginyak, F. F., T. N. Mozharovskaya i V. V. Bashta. "Assessment of Viscoplastic Properties of Titanium Alloys". Strength of Materials 37, nr 3 (maj 2005): 254–59. http://dx.doi.org/10.1007/s11223-005-0037-7.

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Vincent, Y., J. M. Bergheau, J. B. Leblond i J.-F.Jullien. "An experimental mock-up for the study of steel behaviour at high temperature during phase transformation". Journal de Physique IV 120 (grudzień 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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Rozprawy doktorskie na temat "Viscoplastic properties"

Österlöf, Rickard. "Modelling the viscoplastic properties of carbon black filled rubber : A finite strain material model suitable for Finite Element Analysis". Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-184879.

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An increased environmental awareness, legal demands and the large part of total costs attributable to fuel cost are all incentives for the automotive industry to reduce fuel consumption. The optimal driveline to enable this reduction depends on the operational conditions and the available infrastructure. Moreover, special care is needed when developing the driveline isolators, since the demands on noise, vibration and harshness (NVH) are the same regardless of driveline. To this end, computer aided calculations can be used in order to evaluate a large number of configurations. However, these calculations are only, at best, as good as the material models employed. In the foreseeable future, rubber with reinforcing fillers will be used in vibration isolators in order to obtain the desired properties of these components. However, the stiffness and damping of rubber with reinforcing fillers are highly non-linear functions, and the available material models in commercial software and in the literature are often insufficient. Therefore, a finite strain viscoplastic material model is derived in the time domain and implemented as a user defined material model in Abaqus Explicit. The model captures the strain amplitude and frequency dependency of the storage and loss modulus for a carbon black filled natural rubber. The model is accurate over a wide range of shear strain amplitudes and frequencies, 0.2-50 % and 0.5-20 Hz, respectively, using only 5 material parameters. In addition, the model correctly captures the response from bimodal excitations. The implementation in Abaqus Explicit enables component characteristics to be evaluated early in the development phase, with material parameters derived from simple test specimens. The improved accuracy of simulations of these components can aid engineers develop more optimized solutions faster than with conventional methods.
En ökad miljömedvetenhet, juridiska krav och den stora delen av de totala kostnaderna som kan hänföras till bränslekostnader är alla incitament för fordonsindustrin att minska bränsleförbrukningen. Den optimala drivlinan för att möjliggöra denna minskning beror på driftförhållanden och den tillgängliga infrastrukturen. Dessutom ställs höga krav på utvecklingen av drivlineisolatorer, eftersom kraven på buller och vibrationer (NVH) är desamma oavsett drivlina. För detta ändamål kan datorstödda beräkningar användas för att utvärdera ett stort antal konfigurationer. Dessa beräkningar är, i bästa fall, endast så bra som de använda materialmodellerna. Inom en överskådlig framtid kommer gummi med förstärkande fyllmedel användas i vibrationsisolatorer för att erhålla de önskade egenskaperna hos dessa komponenter. Men styvheten och dämpningen i gummi med förstärkande fyllmedel är kraftigt icke-linjära funktioner, och de tillgängliga materialmodellerna i kommersiella programvaror och i litteraturen är ofta otillräckliga. Därför är en viskoplastisk materialmodell för finita deformationer framtagen i tidsdomänen och implementeras som ett användardefinierat material i Abaqus Explicit. Modellen fångar töjningsamplitud- och frekvensberoendet av lagrings- och förlustmodulen för ett kimröksfyllt naturgummi. Den är korrekt över ett brett intervall av skjuvtöjningsamplituder och frekvenser, 0.2-50% respektive 0.5-20 Hz, och kräver endast 5 materialparametrar. Dessutom fångar modeller responsen från bimodala excitationer. Implementeringen i Abaqus Explicit gör att komponentegenskaper kan utvärderas tidigt i utvecklingsfasen, med materialparametrar som härrör från enkla provkroppar. Den förbättrade noggrannheten i simuleringar av dessa komponenter kan hjälpa ingenjörer att utveckla mer optimerade lösningar snabbare än med konventionella metoder.

QC 20160406

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Rmili, Yosra. "ÉTUDE DE LA DILATANCE DE REYNOLDS DU BÉTON ET DE SON EFFET SUR LA FORMATION DE LA COUCHE DE LUBRIFICATION DANS LES TUYAUX DE POMPAGE". Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1283.

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Le processus de pompage du béton revêt une importance capitale dans le secteur de construction, facilitant le transport du béton frais vers le site de coulée, voire des zones difficiles d'accès. Cette technique offre la possibilité d'atteindre des hauteurs et des distances considérables. Toutefois, ce processus n'est pas sans défis. Il est donc primordial de pouvoir bien prédire la pompabilité du béton. En effet, la pompabilité du béton dépend étroitement de ses propriétés rhéologiques et de sa capacité à former une couche de lubrification (CL) lors de son écoulement dans les conduites de pompage. Par conséquent, une bonne compréhension de la rhéologie du béton et des caractéristiques de la CL est essentielle, d'autant plus que les mécanismes de formation de cette dernière demeurent encore méconnus. Cette thèse se concentre sur l'étude de la dilatance de Reynolds (DR) en tant que mécanisme potentiel intervenant dans la formation de la CL, et elle vise à mettre en évidence les principaux paramètres qui les régissent. La première partie de l'étude présente le développement d'une nouvelle méthode pour évaluer les variations de volume induites par le cisaillement, nommée la dilatance de Reynolds du béton en écoulement à surface libre. Cette méthode, bien que plus fiable pour les bétons conventionnels, ne permet cependant pas d'explorer pleinement ce mécanisme. En conséquence, un nouveau dispositif empirique, le CRD-Test, a été conçu pour évaluer la dilatance de Reynolds des bétons autoplaçants soumis à différents scénarios de cisaillement à surface libre et sous pression, simulant ainsi les processus réels de coulage et de pompage. Dans cette seconde partie de l'étude, le béton autoplaçant (BAP) est considéré comme un mélange biphasique, composé de gros granulats (> 1,25 mm) immergés dans une matrice fluide de mortier fin (< 1,25 mm). En outre, le CRD-Test offre une couverture large des niveaux de cisaillement et de pression. Il repose sur un tribomètre à cylindre coaxial modifié, dont la vitesse de rotation varie de 0 à 3 tr/s, et sur un régulateur de pression d'air ajustable de 0 à 300 kPa. Le phénomène de dilatance de Reynolds se traduit par des fluctuations de la pression latérale mesurée au niveau du cylindre extérieur de cet appareil et a été étudié à travers de nouveaux indices. Les résultats expérimentaux révèlent que les indices de pression induits par la dilatance de Reynolds sont en accord avec la maniabilité du béton et ses paramètres de formulation. Les bétons autoplaçants présentant des faibles valeurs d'étalement montrent des indices de dilatance de Reynolds élevés sous cisaillement à surface libre et sous pression. De plus, une approche diphasique permet de mettre en évidence des corrélations entre la dilatance de Reynolds et les caractéristiques des granulats dont le diamètre est supérieur à 1,25 mm ainsi que les caractéristiques viscoplastiques du mortier fin, (i.e. la phase suspendante). De plus l'étude montre que la dilatance de Reynolds est principalement affectée par le degré d'empilement initial du squelette granulaire pendant le processus de pompage. Enfin, les valeurs de dilatance de Reynolds sont en en bon accord avec les caractéristiques du régime d'écoulement, la dynamique des particules et les indices de migration des particules sous l'effet du cisaillement. Selon les corrélations établies, il apparaît que la ségrégation dynamique peut significativement influencer les mécanismes de formation de la CL lors du pompage du béton à faibles taux de cisaillement, illustrant ainsi l'importance de la dilatance de Reynolds dans ce processus. Cependant, il a été observé qu'à des taux de cisaillement plus élevés, la ségrégation dynamique peut avoir un impact négatif sur les valeurs de dilatance de Reynolds, augmentant ainsi le risque de blocage durant le processus de pompage du béton
Concrete pumping process is important in the construction sector, facilitating the transport of fresh concrete to the casting site, even in difficult-to-access areas. This technique enables the achievement of considerable heights and distances. However, this process presents challenges. Therefore, accurately predicting the pumpability of concrete appears to be essential. Indeed, concrete pumpability relies on its rheological properties and its ability to form a lubrication layer (LL) during its flow through pipes. Accordingly, it is worthy to mention that mastering the rheology of concrete and understanding the characteristics of the LL is important, especially considering that the mechanisms of LL formation remain not well understood.This project focuses on investigating Reynolds dilatancy (RD), a potential mechanism involved in LL formation, and aims to highlight the key parameters governing it. The first part of the study introduces the development of a new method to assess shear-induced variations (RD) at free-surface flow. This method, although more reliable for conventional vibrated concrete (CVC), it does not fully explore this mechanism. Consequently, a new empirical device, the CRD-Test, was designed to evaluate the RD of self-compacting concrete (SCC) subjected to various scenarios under free-surface and pressurized conditions, simulating real casting and pumping processes. In this second part of the study, SCC is considered as a biphasic mixture of coarser particles (> 1.25 mm) in a fluid matrix of fine mortar (< 1.25 mm). Moreover, the new experimental device, named CRD-Test, offers wide range of shear and pressure levels. It is based on a modified coaxial cylinder tribometer, with a rotational speed ranging from 0 to 3 rps, and an air pressure regulator from 0 to 300 kPa. The RD phenomenon is manifested by fluctuations in lateral pressure measured at the outer cylinder of this apparatus and it was investigated through new indices.Experimental results reveal that RD values were found to be in good agreement with the workability and design parameters of the investigated concrete mixtures. Concrete with low fluidity values exhibited high RD indices under both free-surface and pressurized shear conditions. Furthermore, a biphasic approach highlights correlations between RD and the characteristics of aggregates with a diameter greater than 1.25 mm, as well as the viscoplastic characteristics of the fine mortar (i.e., the suspending phase). Moreover, RD results are mainly affected by the relative packing density of coarse aggregate during pumping process. Finally, Reynold values were in good agreement with flow regime characteristics, particle dynamics, and shear-induced particle migration indices. According to established correlations, dynamic segregation can significantly influence the mechanisms of LL formation during concrete pumping at low shear rates, illustrating the importance of Reynolds dilatancy in this process. However, at higher shear rates, dynamic segregation has been observed to negatively impact RD values, thereby increasing the risk of blockage during concrete pumping

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Goel, Priya. "Extraction of Equivalent Uniaxial Plastic and Viscoplastic Behavior from Bending Using a Mechanistic Approach". Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5863.

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The present work is aimed at the extraction of material’s yield and creep parameters using cantilevers by conducting constant deflection rate and constant load tests respectively. Under the assumption of Euler-Bernoulli’s beam theory, stress and strain components are considered along beam length only. A stress and strain gradient throughout the cantilever makes bending rich in information as stress-strain rate-strain at every location of the beam corresponds to a single uniaxial test. By extracting these stress-strain rate strain information from multiple locations of the cantilever throughout deformation, high throughput feature of bending is utilized by extracting all the material yield and creep parameters from a single cantilever. The position dependent strain is measured using digital image correlation (DIC) in this work. The estimation of stress in a cantilever during non-linear deformation (i.e., non-linear dependence of stress on strain and/or strain rate), however, needs numerical methods which solve for stress distribution throughout the cantilever using equilibrium equations based on material’s constitutive behavior, beam geometry, loading and boundary conditions. Such numerical methods are developed to gain understanding of the stress redistribution which is found to be transient in nature and finally saturates when permanent (plastic or creep) strain are large (∼3-4%) such that elastic strain are negligible. The influence of material’s yield and creep parameters on stress redistribution profile and associated timelines is studied and limitations of the existing analytical expressions for saturated stress profile are discussed. The numerical method is also utilized to estimate the effect of limitations on strain accuracy measured by DIC on the extracted parameters. Therefore, the present work aims at developing cantilever bending combined with DIC for strain measurement as an alternative testing technique to extract material’s yield and creep parameters from a single cantilever. The procedure for extraction of yield parameters like yield strength and strain hardening exponent is established for a beam of tension-compression symmetric, strain rateinsensitive material using the concept of the ‘invariant point’. These points are identified using numerical methods as the unique locations at every cross-section of the cantilever, one each in tensile and compressive regions, where stress remains almost unchanged during stress redistribution. The hardening exponent and yield strength are measured from a single cantilever with better statistics and thereby improved reliability using strain measured at the invariant points in tensile and compressive regions within an accuracy of 99.5% and 90% respectively for pure copper and aluminium alloys. The procedures for measuring strain rate sensitivity for a tension-compression symmetric, strain-rate sensitive material and yield parameters for a tension-compression asymmetric, strain-rate insensitive material are also proposed and the challenges are highlighted with the understanding that bending has the potential to measure yield parameters for these latter systems as well in future. The timelines associated with stress saturation under creep deformation have been quantified using numerical methods in terms of a parameter stress saturation time (SST). Based on the recommendations obtained from SST, loading profile for T22 boiler steel is redesigned in the form of small loading steps due to which stress gets sufficient time to relax during loading itself and does not exceed yield strength during redistribution. Thus, creep parameters can be extracted at loads as high as yield strength, which is not possible otherwise. This makes testing faster and thereby efficient because creep rates are higher at high load and steady state is achieved faster. In contrast, a high SST at low loads has been identified to explain the misinterpretation of experimental data in terms of mechanism shift at low loads for P91 steel. The numerical method is further developed to include primary creep response at loads above yield which holds relevance to room-temperature creep response of an hcp system, i.e., titanium alloy Ti-6Al. In case of Ti-6Al, it is found from uniaxial creep tests conducted above yield that prior plastic deformation does not affect creep behaviour which implies that plasticity affects only the initial stress distribution. The invariant points which remain invariant to stress redistribution even under the combined effect of creep and plastic deformation are identified based on the numerical methods. The strain at these locations in tension as well as in compression, measured using DIC, are utilized to extract equivalent primary creep response for Ti-6Al using a single cantilever. Therefore, the present work aims at establishing bending as the testing technique to measure yield and creep parameters for a range of materials (FCC, BCC, HCP) and testing conditions (RT-600oC) utilizing minimum sample volume with reduced testing and better statistics.
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Książki na temat "Viscoplastic properties"

Freed, Alan David. Viscoplastic model development with an eye toward characterization. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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1932-, Simitses George J., i Lewis Research Center, red. Thermo-elasto-viscoplastic analysis of problems in extension and shear. [Cleveland, Ohio?: National Aeronautics and Space Administration, Lewis Research Center, 1987.

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1952-, Saleeb Atef F., Castelli Michael G i United States. National Aeronautics and Space Administration., red. A fully associative, nonisothermal, nonlinear kinematic, unified viscoplastic model for titanium alloys. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Freed, Alan David. A viscoplastic model with application of LiF-22%CaF₂ hypereutectic salt. [Washington, D.C.]: National Aeronautics and Space Administration, 1990.

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1932-, Simitses George J., i Lewis Research Center, red. The dynamic aspects of thermo-elasto-viscoplastic snap-through and creep buckling phenomena. [Cleveland, Ohio?: National Aeronautics and Space Administration, Lewis Research Center, 1987.

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Części książek na temat "Viscoplastic properties"

Nemat-Nasser, S., B. Balendran i Muneo Hori. "Bounds for Overall Nonlinear Elastic or Viscoplastic Properties of Heterogeneous Solids". W IUTAM Symposium on Microstructure-Property Interactions in Composite Materials, 215–21. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0059-5_18.

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Tan, Qinwen, i Huiming Tang. "In Situ Triaxial Creep Test on Gravelly Slip Zone Soil of a Giant Landslide: Innovative Attempts and Findings". W Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022, 109–21. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18471-0_9.

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AbstractIn recent years, numerous landslides catastrophes have occurred, generating considerable financial losses and other tolls. The deformational and mechanical properties of sliding zone soil would be of primary significance to landslide research, as the sliding zone basically controls the initiation and mobility of the landslide. An in situ triaxial test was carried out on a sample from the sliding zone of the Riverside Slump 1# landslide, a subdivision of the Huangtupo landslide in the Three Gorges area of China. The test results indicate that a. the sliding zone exhibits low compressibility due to the high rock content (54.3%) and long-time consolidation by the overlying soil mass; b. only decaying creep occurs without abrupt failure, and a constitutive equation with both linear and nonlinear viscoplastic terms is deduced to accurately fit the test data; c. the surface with an orientation of 35° presents anisotropic traits in terms of displacement, possibly due to cracks that formed at similar orientations within the sample cube; and d. the creep behavior of the landslide may be closely related to the properties of the sliding zone soil. When a similar stress magnitude to that of the in situ stress environment is applied to the sample, the sliding zone soil behavior matches the landslide behavior. The test results indicate that the Huangtupo 1# landslide will continue to creep, as interpreted from the deformation and properties of the sample. However, unavoidable limitations of the test and extreme external factors, namely, unexpected rainfall and water fluctuation, cannot be ignored.

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Bauer, Harro, i Norbert Boese. "Rheological Properties of a Micelle System in Solution to be Used as Reference Liquid with Viscoplastic Behaviour". W Third European Rheology Conference and Golden Jubilee Meeting of the British Society of Rheology, 37–40. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0781-2_20.

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Wang, Zhijie, Mark J. Golob i Naomi C. Chesler. "Viscoelastic Properties of Cardiovascular Tissues". W Viscoelastic and Viscoplastic Materials. InTech, 2016. http://dx.doi.org/10.5772/64169.

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Nishitani, Yosuke, Toshiyuki Yamanaka, Tetsuto Kajiyama i Takeshi Kitano. "Thermal Properties of Hemp Fiber Reinforced Plant-Derived Polyamide Biomass Composites and their Dynamic Viscoelastic Properties in Molten State". W Viscoelastic and Viscoplastic Materials. InTech, 2016. http://dx.doi.org/10.5772/64215.

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Ponce-García, Néstor, Benjamín Ramírez-Wong, Anayansi Escalante-Aburto, Patricia I. Torres-Chávez i Juan de Dios Figueroa-Cárdenas. "Mechanical Properties in Wheat (Triticum aestivum) Kernels Evaluated by Compression Tests: A Review". W Viscoelastic and Viscoplastic Materials. InTech, 2016. http://dx.doi.org/10.5772/64171.

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Nishitani, Yosuke, i Takeshi Kitano. "Rheological Properties of Carbon Nanofiber-Filled Polyamide Composites and Blend of these Composites and TPE". W Viscoelastic and Viscoplastic Materials. InTech, 2016. http://dx.doi.org/10.5772/64531.

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Kobayashi, Shiro, Soo-Ik Oh i Taylan Altan. "Thermo-Viscoplastic Analysis". W Metal Forming and the Finite-Element Method. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195044027.003.0015.

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The main concern here is the analysis of plastic deformation processes in the warm and hot forming regimes. When deformation takes place at high temperatures, material properties can vary considerably with temperature. Heat is generated during a metal-forming process, and if dies are at a considerably lower temperature than the workpiece, the heat loss by conduction to the dies and by radiation and convection to the environment can result in severe temperature gradients within the workpiece. Thus, the consideration of temperature effects in the analysis of metal-forming problems is very important. Furthermore, at elevated temperatures, plastic deformation can induce phase transformations and alterations in grain structures that, in turn, can modify the flow stress of the workpiece material as well as other mechanical properties. Since materials at elevated temperatures are usually rate-sensitive, a complete analysis of hot forming requires two considerations—the effect of the rate-sensitivity of materials and the coupling of the metal flow and heat transfer analyses. A material behavior that exhibits rate sensitivity is called viscoplastic. A theory that deals with viscoplasticity was described in Chap. 4. It was shown that the governing equations for deformation of viscoplastic materials are formally identical to those of plastic materials, except that the effective stress is a function of strain, strain-rate, and temperature. The application of the finite-element method to the analysis of metal-forming processes using rigid-plastic materials leads to a simple extension of the method to rigid-viscoplastic materials. The importance of temperature calculations during a metal-forming process has been recognized for a long time. Until recently, the majority of the work had been based on procedures that uncouple the problem of heat transfer from the metal deformation problem. Several researchers have used the following approach. They determined the flow velocity fields in the problem either experimentally or by calculations, and they then used these fields to calculate heat generation. Examples of this approach are the works of Johnson and Kudo on extrusion, and of Tay et al. on machining. Another approach uses Bishop’s numerical method in which heat generation and transportation are considered to occur instantaneously for each time-step with conduction taking place during the time-step.

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"Computer simulation of consistency and rheology tests of fresh concrete by viscoplastic finite element method". W Properties of Fresh Concrete, 311–18. CRC Press, 1990. http://dx.doi.org/10.1201/9781482267495-45.

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BOUALI, A., i C. TETE. "Viscoplastic Properties of an Fe–Cr–P–C Amorphous Alloy". W Rapidly Quenched Metals 6, 493–96. Elsevier, 1988. http://dx.doi.org/10.1016/b978-1-85166-971-4.50102-x.

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Streszczenia konferencji na temat "Viscoplastic properties"

Zhang, Qian, Abhijit Dasgupta i Peter Haswell. "Viscoplastic Constitutive Properties and Reliability of Lead-Free Sn3.9Ag0.6Cu Solder". W ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41840.

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The viscoplastic constitutive properties of Sn3.9Ag0.6Cu lead-free alloy are presented and compared with baseline data from eutectic Sn63Pb37 solder. Steady-state creep models are obtained from creep and monotonic tests at three different temperatures for both solders. Based on steady-state creep results and creep test data, a transient creep model is developed for both Pb-free and Sb37Pb solders. One-dimensional incremental model of the test setup is developed to simulate constant-load creep, monotonic, and isothermal cyclic mechanical tests performed over various temperatures, strain rates and stresses using a thermo-mechanical-microstructural (TMM) test system, developed by the authors. By fitting simulation results to monotonic testing data, plastic models are also achieved. The devoloped viscoplastic constitutive models are evaluated in a two-dimensional nonlinear Finite element analysis of a PBGA352 package under a −55°C∼125°C thermal cycling environment. The viscoplastic behavior of Pb-free solder is compared with that of eutectic Sn37Pb solder.

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Leslie, D., i A. Dasgupta. "Viscoplastic properties of pressure-less sintered silver materials using indentation". W 2016 17th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2016. http://dx.doi.org/10.1109/eurosime.2016.7463371.

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Al Shrah, M., i Isam Janajreh. "Mechanical recycling of cross-link polyethylene: Assessment of static and viscoplastic properties". W 2013 International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2013. http://dx.doi.org/10.1109/irsec.2013.6529674.

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Heffes, M. J., i H. F. Nied. "Analysis of Interface Cracking in Flip Chip Packages With Viscoplastic Solder Deformation". W ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35346.

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Jiang, Qian, Subhasis Mukherjee, Bastian Vogt, Abhijit Dasgupta, David Shaddock i Liang Yin. "Mechanical Constitutive Properties of Two High-Temperature Lead-Rich Solders". W ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48708.

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This study focuses on the mechanical properties of two kinds of solders for high temperature interconnections (melting temperature above 280 °C after reflow). They are both lead-rich solders in wire form: 93.5Pb/5Sn/1.5Ag and 92.5Pb/5Sn/2.5Ag. The mechanical constitutive tests conducted in this study include: (i) monotonic elastic-plastic stress-strain response at constant strain rates and constant temperatures; and (ii) isothermal, viscoplastic creep strain response at several constant stress levels and different temperatures. The sensitivities of the material viscoplastic constitutive response to temperature, loading rate and stress level were systematically studied, so that the mechanical performance of these two solders could be compared with those of other solders, at similar test conditions. Both the Pb-rich solders studied had statistically similar behavior at the tested stress levels and temperatures in creep tests. The Ramberg-Osgood model and the Garofalo model were used to represent the elastic-plastic and creep behavior, respectively, of each solder and the corresponding model constants are presented in the paper.

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Iceri, Daiane Mieko, Jorge Luiz Biazussi, Charlie van der Geest, Roney Leon Thompson i Marcelo Souza de Castro. "Analysis of Carbopol And Triethanolamine Concentration in The Viscoplastic Properties of Aqueous Solution". W The 8th World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2022. http://dx.doi.org/10.11159/htff22.166.

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Rauchs, G., i J. Bardon. "Identification of elasto-viscoplastic material properties from indentation testing using an inverse method". W CONTACT/SURFACE 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/secm090121.

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Vaghefpour, Hossein, i Ali Nayebi. "Drilling Thrust and Torque Prediction of Viscoplastic Materials". W ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95246.

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A model for drilling of viscoplastic materials is presented. An analytical model is developed for predicting thrust force and torque in the drilling with a twist drill. The thermomechanical properties are accounted for describing the material flow in the primary shear zone and at the element-chip interface. A temperature friction law is introduced. The approach is based on the representing the cutting forces along the cutting lips as a series of oblique elements. Similarly, cutting in the chisel region is treated as orthogonal cutting with different speeds depending on the radial location. The section forces obtained by the model are combined to determine the overall thrust force and drilling torque. The results of the proposed model are compared with experimental results and a good agreement is obtained.

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Cazacu, Oana, i N. D. Cristescu. "Analysis of Steady-State Penetration in Viscoplastic Porous Materials". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61221.

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A study of the steady-state motion of a porous medium over a rigid wedge-shaped penetrator was conducted. In order to describe the combined effects of strain rate and compaction on yielding, a rigid viscoplastic constitutive equation was used. The deviatoric response was modeled with a non-homogeneous Bingam type equation with shear yield limit dependent on the current density. The system of partial differential equations consisting of the constitutive equation, the continuity equation, and the balance of momentum was solved for different interface conditions. The resistance to penetration as a function of the striking velocity, target properties (density dependent yield, locking pressure, locking density), friction coefficient as well as wedge semi-angle was obtained. The wedge semi- angle corresponding to a minimum in resistance to penetration in mortar for various impact conditions also resulted from this investigation.

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Jalouli, Zahra, Wilson Maia, Noura Haidar i Anatoli Serghei. "Evaluation of warpage of FOWLP considering the viscoelastic and viscoplastic properties of Epoxy Molding Compound". W 2024 25th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2024. http://dx.doi.org/10.1109/eurosime60745.2024.10491575.

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