Relevant bibliographies by topics / Thermal and mechanical models

Academic literature on the topic 'Thermal and mechanical models'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Thermal and mechanical models"

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Wilson, D. A., and J. R. Warren. "Thermal Mechanical Crack Growth Rate of a High Strength Nickel Base Alloy." Journal of Engineering for Gas Turbines and Power 108, no. 2 (April 1, 1986): 396–402. http://dx.doi.org/10.1115/1.3239918.

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An understanding of thermal mechanical fatigue (TMF) crack propagation is fundamental to the application of fracture mechanics to gas turbine components. Typical operating conditions for a cooled turbine disk rim consist of a complex mechanical history and an associated variable amplitude thermal history. While thermally induced stress gradients are commonly incorporated in the mechanical history, the effects of thermal cycling on crack growth must be addressed in an appropriate fatigue model. A current computer-based empirical crack propagation modeling system has demonstrated effectiveness under isothermal conditions and can be readily expanded to include thermal-mechanical effects. The existing isothermal models were developed from an extensive data base and describe crack growth over a broad range of temperature and loading conditions. Building on this established system, a model of thermal-mechanical crack growth is being developed.
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Meena, Ayush, Tushar Sharma, Mohit Patodiya, and P. V. Ramana. "Chronology of Recycled Plastic Mathematical Models, Mechanical and Thermal Characterisation." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 499–506. http://dx.doi.org/10.38208/acp.v1.540.

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Recycled plastic fibers restrict the characteristics of hardened concrete. They offer no considerable ductility after the initial fracture. Their capacity to prevent bleed and separation helps preserve the original water-cemetery ratio of the surface mortar, thereby enhancing the abrasion resistance. Recycled plastic fibers can be efficient in dispersing stresses and improving frost resistance. The spilling of concrete into the fire has also proven to reduce. Recycled plastic fibers enhance initial characteristics in sprayed concrete and decrease the shedding and rebound. The tiny recycled plastic fibers, which should have similar structural advantages to steel fibers, must be distinguished from giant synthetic fibers. PP is fully resistant to acid and alkaline circumstances and is not affected by acid/alkaline environments, including marine conditions. Chemically PP is non-absorbent, i.e., no moisture absorption and associated characteristic changes.
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Hentati, Hamdi, Ilyes Ben Naceur, Wassila Bouzid, and Aref Maalej. "Numerical Analysis of Damage Thermo-Mechanical Models." Advances in Applied Mathematics and Mechanics 7, no. 5 (July 21, 2015): 625–43. http://dx.doi.org/10.4208/aamm.2014.m517.

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AbstractIn this paper, we present numerical computational methods for solving the fracture problem in brittle and ductile materials with no prior knowledge of the topology of crack path. Moreover, these methods are capable of modeling the crack initiation. We perform numerical simulations of pieces of brittle material based on global approach and taken into account the thermal effect in crack propagation. On the other hand, we propose also a numerical method for solving the fracture problem in a ductile material based on elements deletion method and also using thermo-mechanical behavior and damage laws. In order to achieve the last purpose, we simulate the orthogonal cutting process.
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Kan, Qian Hua, Jian Li, Han Jiang, and Guo Zheng Kang. "An Improved Thermo-Ratcheting Boundary of Pressure Pipeline." Key Engineering Materials 725 (December 2016): 311–15. http://dx.doi.org/10.4028/www.scientific.net/kem.725.311.

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The thermal ratcheting boundary of pressure pipeline is a popular topic in nuclear power engineering. The existed thermal ratcheting boundary based on the Bree diagram is conservative for structures subjected to the thermo-mechanically coupled loadings since it was obtained only from an elastic-perfectly plastic model. Therefore, it is necessary to improve the existed thermal ratcheting boundary based on a reasonable constitutive model. The Bree diagram was validated firstly by the linear relationship between the plastic strain increment and mechanical stress by finite element method. And then the influences of different constitutive models, such as elastic-perfectly plastic, multi-linear kinematic hardening, Chaboche and Abdel Karim-Ohno models, on the thermal ratcheting boundary of pressure pipeline were investigated numerically. It is found that the elastic-perfectly plastic and multi-linear kinematic hardening models provide the lower and upper bounds for the thermal ratcheting boundary, respectively. Finally, an improved thermal ratcheting boundary by introducing the dimensionless axial tensile stress was proposed based on the Bree diagram, the improved thermal ratcheting boundary covered the present cases with different ratios of mechanical stress over thermal stress.
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Slavik, D., and Huseyin Sehitoglu. "Constitutive Models Suitable for Thermal Loading." Journal of Engineering Materials and Technology 108, no. 4 (October 1, 1986): 303–12. http://dx.doi.org/10.1115/1.3225887.

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A non-unified creep plasticity constitutive model and a unified creep-plasticity model have been considered. In the non-unified model, creep and plastic strains were added separately; in the unified model, they were treated in a unified manner. These models were used to predict cyclic hardening and mean stress relaxation for isothermal loading conditions. The results indicate that certain instabilities occured in unified creep-plasticity simulations at low temperatures. Material behavior for thermal loading was studied using the two-bar structure. Both constitutive models were modified to handle material behavior changes with temperature. The thermal loading response was predicted satisfactorily with both models for most cases. However, certain model limitations were encountered in the unified model. The capabilities of both models are outlined and discussed.
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G. K, Mahadeva Raju, G. M. Madhu, P. Dinesh Sankar Reddy, and Karthik K V. "Mechanical and Thermal Properties of Epoxy Polymer Composites Reinforced with CuO." YMER Digital 20, no. 12 (December 15, 2021): 272–80. http://dx.doi.org/10.37896/ymer20.12/25.

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Polymer nano composites using CuO as filler material and epoxy as matrix materials were prepared with different concentrations of CuO nano particles (1-5 wt%) by shear mixing followed by ultra-sonication process. The mechanical properties such as compressive strength and modulus were characterized using ASTM standards. It was found that the addition of CuO nano particles both compressive strength and modulus increased. As the CuO content increased in epoxy matrix the moduli values found to increase and were further analyzed using micromechanical models. The analytical models discussed correlate well with experimental values. The models discussed include Nicolais – Narkis, Turcsanyi, Piggot – Leidner and Nielsen models for the tensile strength values and for tensile modulus the models discussed include Halpin Tsai, Kerner and Sato – Furukawa models. These micromechanics models predict stiffness of nanocomposites with both aligned and randomly oriented fillers. XRD pattern revealed the interaction between CuO nanoparticles and epoxy matrix. The thermal decomposition behaviour revealed that there is an enhancement of onset of decomposition temperature by 28oC for 5wt% CuO filled epoxy than that of pure epoxy
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Ali, Mahmoud, Thomas Sayet, Alain Gasser, and Eric Blond. "Transient Thermo-Mechanical Analysis of Steel Ladle Refractory Linings Using Mechanical Homogenization Approach." Ceramics 3, no. 2 (April 2, 2020): 171–89. http://dx.doi.org/10.3390/ceramics3020016.

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Mortarless refractory masonry structures are widely used in the steel industry for the linings of many high-temperature industrial applications including steel ladles. The design and optimization of these components require accurate numerical models that consider the presence of joints, as well as joint closure and opening due to cyclic heating and cooling. The present work reports on the formulation, numerical implementation, validation, and application of homogenized numerical models for the simulation of refractory masonry structures with dry joints. The validated constitutive model has been used to simulate a steel ladle and analyze its transient thermomechanical behavior during a typical thermal cycle of a steel ladle. A 3D solution domain and enhanced thermal and mechanical boundary conditions have been used. Parametric studies to investigate the impact of joint thickness on the thermomechanical response of the ladle have been carried out. The results clearly demonstrate that the thermomechanical behavior of mortarless masonry is orthotropic and nonlinear due to the gradual closure and reopening of the joints with the increase and decrease in temperature. In addition, resulting thermal stresses increase with the increase in temperature and decrease with the increase in joint thickness.
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Irving, A. D. "Validation of dynamic thermal models." Energy and Buildings 10, no. 3 (January 1988): 213–20. http://dx.doi.org/10.1016/0378-7788(88)90007-2.

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Bahrami, M., J. R. Culham, M. M. Yananovich, and G. E. Schneider. "Review of Thermal Joint Resistance Models for Nonconforming Rough Surfaces." Applied Mechanics Reviews 59, no. 1 (January 1, 2006): 1–12. http://dx.doi.org/10.1115/1.2110231.

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The thermal contact resistance (TCR) in a vacuum is studied. The TCR problem is divided into three different parts: geometrical, mechanical, and thermal. Each problem includes a macro- and microscale subproblem; existing theories and models for each part are reviewed. Empirical correlations for microhardness, and the equivalent (sum) rough surface approximation, are discussed. Suggested correlations for estimating the mean absolute surface slope are summarized and compared with experimental data. The most common assumptions of existing thermal analyses are summarized. As basic elements of thermal analyses, spreading resistance of a circular heat source on a half-space and flux tube are reviewed; also existing flux tube correlations are compared. More than 400 TCR data points collected by different researchers during the last 40years are grouped into two limiting cases: conforming rough and elastoconstriction. Existing TCR models are reviewed and compared with the experimental data at these two limits. It is shown that the existing theoretical models do not cover both of the above-mentioned limiting cases. This review article cites 58 references.
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Campano, Miguel Ángel, Samuel Domínguez-Amarillo, Jesica Fernández-Agüera, and Juan José Sendra. "Thermal Perception in Mild Climate: Adaptive Thermal Models for Schools." Sustainability 11, no. 14 (July 19, 2019): 3948. http://dx.doi.org/10.3390/su11143948.

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A comprehensive assessment of indoor environmental conditions is performed on a representative sample of classrooms in schools across southern Spain (Mediterranean climate) to evaluate the thermal comfort level, thermal perception and preference, and the relationship with HVAC systems, with a comparison of seasons and personal clothing. Almost fifty classrooms were studied and around one thousand pool-surveys distributed among their occupants, aged 12 to 17. These measurements were performed during spring, autumn, and winter, considered the most representative periods of use for schools. A new proposed protocol has been developed for the collection and subsequent analysis of data, applying thermal comfort indicators and using the most frequent predictive models, rational (RTC) and adaptive (ATC), for comparison. Cooling is not provided in any of the rooms and natural ventilation is found in most of the spaces during midseasons. Despite the existence of a general heating service in almost all classrooms in the cold period, the use of mechanical ventilation is limited. Heating did not usually provide standard set-point temperatures. However, this did not lead to widespread complaints, as occupants perceive the thermal environment as neutral—varying greatly between users—and show a preference for slightly colder environments. Comparison of these thermal comfort votes and the thermal comfort indicators used showed a better fit of thermal preference over thermal sensation and more reliable results when using regional ATC indicators than the ASHRAE adaptive model. This highlights the significance of inhabitants’ actual thermal perception. These findings provide useful insight for a more accurate design of this type of building, as well as a suitable tool for the improvement of existing spaces, improving the conditions for both comfort and wellbeing in these spaces, as well as providing a better fit of energy use for actual comfort conditions.
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Dissertations / Theses on the topic "Thermal and mechanical models"

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Nguyen, Van-Tri. "Thermal and thermo-mechanical behavior of energy piles." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1160/document.

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Le comportement thermique et thermo-mécanique des pieux énergétiques est étudié par plusieurs approches : mesures au laboratoire sur des éprouvettes de sol, modélisation physique en modèle réduit, expérimentations sur pieu en vraie grandeur, et calculs numériques/analytiques. D’abord, la conductivité thermique d’un loess à l’état non saturé est mesurée en fonction de la teneur en eau et de la succion. Les résultats montrent une relation univoque entre la conductivité thermique et la teneur en eau pendant un cycle d’humidification/séchage alors qu’une boucle d’hystérésis est observée pour la relation entre la conductivité thermique et la succion. Deuxièmement, des essais thermiques sont réalisés sur un pieu énergétique expérimental en vraie grandeur pour étudier le transfert thermique à l’échelle réelle. Troisièmement, une solution analytique est proposée pour simuler la conduction thermique d’un pieu énergétique vers le sol environnant pendant un chauffage. Les tâches mentionnées ci-dessus concernant le comportant thermique sont ensuite complétées par des études sur le comportement thermo-mécanique des pieux énergétiques. D’un côté, des expérimentations sont réalisées sur un modèle réduit de pieu installé dans un sable sec ou dans une argile saturée. Trente cycles thermiques, représentant trente cycles annuels, sont appliqués au pieu sous différentes charges axiales en tête. Les résultats montrent un tassement irréversible avec les cycles thermiques ; ce tassement est plus important sous une charge axiale plus grande. De plus, le tassement est plus marqué pendant les premiers cycles thermiques et devient négligeable pour les cycles suivants. De l’autre côté, les travaux expérimentaux sur le modèle réduit de pieu sont complétés par les calculs numériques utilisant la méthode des éléments finis. Cette approche est d’abord validée avec les résultats obtenus sur le pieu modèle avant d’être utilisée pour prédire les résultats des expérimentations en vraie grandeur
The thermal and thermo-mechanical behavior of energy piles is investigated by various approaches: laboratory measurement on small soil samples, physical modeling on small-scale pile, experiments on real-scale pile, and analytical/numerical calculations. First, the thermal conductivity of unsaturated loess is measured simultaneously with moisture content and suction. The results show a unique relationship between thermal conductivity and moisture content during a wetting/drying cycle while a clear hysteresis loop can be observed on the relationship between thermal conductivity and suction. Second, thermal tests are performed on a full-scale experimental energy pile to observe heat transfer at the real scale. Third, an analytical solution is proposed to simulate conductive heat transfer from an energy pile to the surrounding soil during heating. The above-mentioned tasks related to the thermal behavior are then completed by studies on the thermo-mechanical behavior of energy piles. On one hand, experiments are performed on a small-scale pile installed either in dry sand or in saturated clay. Thirty thermal cycles, representing thirty annual cycles, are applied to the pile under various constant pile head loads. The results show irreversible pile head settlement with thermal cycles; the settlement is higher at higher pile head load. In addition, the irreversible thermal settlement is the most significant during the first cycles; it becomes negligible at high number of cycles. On the other hand, the experimental work with small-scale pile is completed with numerical calculations by using the finite element method. This approach is first validated with the results on small-scale pile prior to be used to predict the results of full-scale experiments
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Vilaithong, Rummiya [Verfasser]. "Models for Thermal and Mechanical Monitoring of Power Transformers / Rummiya Vilaithong." Aachen : Shaker, 2011. http://d-nb.info/1070150282/34.

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Kiley, Erin Marie. "Reduced-Dimensional Coupled Electromagnetic, Thermal, and Mechanical Models of Microwave Sintering." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-dissertations/212.

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In recent years, sintering of powdered materials in microwaves has emerged as a manufacturing technique with many potential advantages over conventional sintering methods, including the possibility of faster processing and finer microstructure, along with the potential for vast energy savings. However, the technique remains on the level of laboratory studies and is underutilized in industry, mostly due to the difficulty of controlling the process: the intrinsically nonuniform temperature pattern that results from microwave heating routinely induces nonuniform mechanical deformation. Mathematical models and computer simulations can help to clarify the factors that influence this process and aid experimentalists in the design of efficient processing equipment. Although a number of modelling techniques have been reported to this end, they appear to inadequately represent the entire chain of related physical phenomena, which involves interaction of the electromagnetic field with the material, heat transfer, and mechanical deformation, each of which is coupled with both of the others, and all of which occur on different time scales. In this work, we present an original comprehensive mathematical formulation that accounts for the chain of physical processes comprising microwave sintering in one- and two-dimensional scenarios. We develop models for simulating the coupled electromagnetic, thermal, and mechanical phenomena at their appropriate time and spatial scales, and in addition, we account for the temperature and density dependence of the full set of thermal and dielectric properties of the material undergoing sintering. The electromagnetic and temperature fields are approximated using finite difference methods, and the mechanical problem is solved using the Master Sintering Curve representation of the density kinetics, which gives a way of accounting for the effect of microscale transport on the macroscopic property of relative density. For constant-rate sintering trials, we use the exponential integral to compute the work of sintering, which reduces computation time. The presented algorithms are all implemented and shown in MATLAB and Python. Simulation of density and temperature evolution of the sintered sample shows processing times and shrinkage rates comparable to experimental results. This work lays a theoretical and computational foundation for modelling the general three-dimensional problem and computer-aided design of efficient sintering processes.
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Ogata, Sho. "Development of Coupled Thermal-Hydraulic-Mechanical-Chemical Models for Predicting Rock Permeability Change." Doctoral thesis, Kyoto University, 2019. http://hdl.handle.net/2433/244532.

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京都大学
0048
新制・課程博士
博士(工学)
甲第22051号
工博第4632号
新制||工||1722(附属図書館)
京都大学大学院工学研究科都市社会工学専攻
(主査)教授 岸田 潔, 教授 木村 亮, 教授 小池 克明
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DFAM
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Evans, Thomas C. (Thomas Carl) 1971. "Statistical usage models in mobile processor thermal design and testing." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89389.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Sloan School of Management; in conjunction with the Leaders for Manufacturing Program at MIT, 2003.
Includes bibliographical references (p. 77).
by Thomas C. Evans.
S.M.
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Kokorev, A. E., A. O. Kiriak, and О. Г. Аврунін. "Some Models of Mechanical and Thermal Properties of Skin in the Context of Plastic Surgery." Thesis, Kharkiv, KNURE, 2019. http://openarchive.nure.ua/handle/document/10196.

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Urquiza, Fernandez Guillermo 1978. "Thermal model of an annular fuel cell." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89920.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
Includes bibliographical references (p. 81).
by Guillermo Urquiza Fernandez.
S.M.and S.B.
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Lahoori, Mojdeh. "Thermo-hydro-mechanical behavior of an embankment to store thermal energy." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0252.

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Le stockage de chaleur dans des géostructures énergétiques telles que des remblais est réalisable en installant des échangeurs horizontaux au sein des différentes couches de sol compacté. Dans ce système, l'énergie thermique qui est injectée en été via un fluide caloporteur circulant dans les échangeurs de chaleur, peut être extraite en période hivernale. Dans ces conditions, lors de la mise en service, le sol compacté est soumis à des variations de température quotidiennes et saisonnières. Ces variations pourraient modifier les performances thermo-hydro-mécaniques du sol compacté. Ainsi, le but de cette étude est d'étudier les performances thermiques et mécaniques d'un sol compacté lorsqu'il est soumis à des variations de température monotones et cycliques. Le sol étudié est un limon fréquemment utilisé dans les constructions de remblais en France. Le comportement thermique et mécanique du sol est étudié à un état de compactage correspondant aux propriétés thermiques optimales. Dans cet état, le sol compacté est non saturé ce qui complexifie l'estimation de ses propriétés thermiques. Pour pallier à ces difficultés, dans cette étude, un modèle inverse est proposé pour estimer les propriétés thermiques du sol compacté. L’efficacité du modèle est testée sur un jeu de données acquises dans la gamme de 20 à 50 °C dans un modèle réduit en laboratoire. Les valeurs obtenues sont ensuite comparées à des mesures classiques en laboratoire (méthodes en régime transitoire et en régime permanent). Cette méthode pourrait permettre de suivre l’évolution des propriétés thermiques du stockage et ainsi assurer son efficacité tout au long de sa durée de vie. La question de la stabilité à long terme de ces structures soumises à des variations thermiques monotones (5, 20 et 50 °C) et cycliques (5 à 50 °C) est ensuite abordée à l'aide d'essais oedomètriques et d’essais de cisaillement direct à température contrôlée. Les résultats des essais de compressibilité ont montré que l'effet de la variation de température est plus prononcé sous une contrainte verticale supérieure à la pression de préconsolidation. Les indices de compression et de gonflement peuvent être considérés comme indépendants des variations de température. Donc le tassement global du remblai dû aux variations thermiques pourrait être considéré comme négligeable. Les résultats des essais de cisaillement direct ont montré que les variations de température (monotones ou cycliques) augmentent la cohésion ce qui est avantageux pour la capacité portante et la stabilité des pentes des remblais. Dans la phase de conception d'un remblai de stockage, ces résultats seraient utiles au dimensionnement du système si des trajectoires thermomécaniques similaires à celles de cette étude sont respectées. Dans une dernière partie, une simulation numérique prenant en compte l'interaction sol-atmosphère est réalisée afin d’évaluer la performance thermique de ce sol compacté en conditions naturelles. Différentes profondeurs d'installation de boucles d'échangeurs de chaleur sont testéss ainsi que différents scénarios de stockage. Les résultats ont montré que le sol compacté augmente de 8.5% les performances du système par rapport à l'installation d'une boucle horizontale dans le sol naturel (non compacté). Les résultats de deux scénarios différents ont montré qu’en été avec un fluide ayant une température d'entrée de 50 °C augmente significativement la performance du système. De plus, une installation plus profonde des boucles horizontales améliore également la performance du système. Il convient de noter que le remblai est en interaction avec l'atmosphère depuis ses surfaces supérieure et latérale, l'efficacité thermique de la structure pourrait être affectée en raison des pertes de chaleur. Par conséquent, il est préférable de placer les échangeurs de chaleur loin des surfaces supérieures et latérales
Nowadays, thermal energy storage in geostructures like embankments can be possible by installing the horizontal heat exchangers in different layers of compacted soil. In this system, the thermal energy is stored in summer via a fluid, circulating in the heat exchangers, to be extracted in the demand period. When the serviceability of embankment as a medium to store the thermal energy starts, the compacted soil will be subjected to the daily and seasonally temperature variations. These seasonal temperature variations could modify the thermo-hydro-mechanical performance of the compacted soil. Thus, the aim of this study is to investigate the thermal and mechanical performances of a compacted soil when it is subjected to monotonic and cyclic temperature variations. The studied soil is a sandy lean clay that is frequently used in embankment constructions in France. The thermal and mechanical behavior of the soil are investigated at a compaction state corresponding to the optimal thermal properties. However, this compacted soil is unsaturated and the estimation of its thermal properties is complex. In this study, an inverse analytical model is proposed to estimate the thermal properties of the soil using temperature monitoring in the range of 20 to 50 °C in a soil compacted in a large container. The estimated thermal parameters were compared to classical laboratory measurements (transient and steady-state methods). The comparison showed that the estimated values were close to the results obtained in transient laboratory method. Using this method, the thermal efficiency of the compacted soil can be verified in the lifetime of the storage system. To ensure the structure stability, long-term mechanical response of these systems subjected to monotonic and cyclic temperature variations should be investigated. To achieve this aim, using temperature-controlled oedometric and direct shear devices, consolidation and shear parameters of the studied soil at different monotonic (5, 20, and 50 °C) and cyclic (5 to 50 °C) temperatures were investigated. The results of temperature-controlled oedometric tests showed that the effect of the temperature variation is more pronounced under vertical pressures higher than the preconsolidation pressure. The compression and swelling indexes could be considered independent of temperature variations. Therefore, the overall settlement of the embankment due to thermal variation near the heat exchangers could be considered negligible. The results of temperature-controlled direct shear tests showed that the temperature variations (monotonic heating or cooling, or temperature cycles) increased the cohesion which is beneficial for the bearing capacity and slope stability of embankments. These results can be directly used in the design of embankments to store thermal energy exposed to similar thermo-mechanical paths. Finally, the thermal performance of the compacted soil is verified using a numerical simulation considering the soil atmosphere interaction. Different depths installation of heat exchanger loops and different heat storage scenarios were simulated. The results showed that the compacted soil increases 8.5% the systems performance compared to the horizontal loop installation in the local soil. The results of two different scenarios show that an inlet fluid temperature of 50 °C in summer increases highly the system performance (13.7% to 41.4%) while the improvement is less significant (0% to 4.8%) for the ambient inlet temperature. Moreover, a deeper installation of horizontal loops increases the system performance. From the numerical simulation results can be concealed that the embankment is in interaction with the atmosphere from its upper and lateral surfaces, the thermal efficiency of the structure could be affected due to heat losses. Therefore, it is preferable to place the heat exchangers away from the top and side surfaces
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Poller, Tilo. "Thermal and thermal-mechanical simulation for the prediction of fatigue processes in packages for power semiconductor devices." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-154320.

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The knowledge about the reliability of power electronics is necessary for the design of converters. Especially for offshore applications it is essential to know, which fatigue processes happen and how the lifetime can be estimated. Numerical simulation is an important tool for the development of power electronic systems. This thesis analyse the thermal and thermal-mechanical behaviour of packages for power semiconductor devices with the help of simulations. One topic is the evaluation of different thermal models. The main focus is on the description of the thermal cross-coupling between the devices and the influence to the lifetime estimation. The power module is a well established package for power semiconductor devices. It will be explained how the heating period of power cycles influences the failure mode of this package type. Additionally, it will evaluated how SiC devices and DAB substrates influence the power cycling capability. The press-pack is in focus for high power applications as the package short-circuits during an electrical failure without external auxiliary systems. However, the knowledge about the power cycling behaviour is currently limited. With the help of simulations this behaviour will be analysed and possible weak points will be also derived. In the end of the work it will be discussed, how the lifetime can be estimated with help of FEM simulations
Für die Entwicklung von Umrichtern ist die Kenntnis über die Zuverlässigkeit der Leistungselektronik ein wichtiges Kernthema. Insbesondere für Offshore-Anwendungen ist das Wissen über die stattfindenden Ermüdungsprozesse und die Abschätzung der zu erwartenden Lebensdauer der Bauteile essentiell. Hierfür hat sich die Simulation als ein wichtiges Werkzeug für die Entwicklung und Lebensdauerbewertung von leistungselektronischen Anlagen etabliert. In der folgenden Arbeit wird das thermische und das thermisch-mechanische Verhalten der Leistungselektronik mittels Simulationen untersucht. Hierzu wird ein Vergleich zwischen verschiedenen thermischen Modellen für Leistungsbauelemente durchgeführt. Schwerpunkt ist die Beschreibung der thermischen Kopplung zwischen den Chips und deren Einfluss auf die Lebensdauerabschätzung. Ein weiterer Schwerpunkt ist das Leistungsmodul, welches sich als ein Standardgehäuse etabliert hat. Dazu wird erklärt, wie die Variation der Einschaltzeit im aktiven Lastwechseltest den Fehlermodus dieses Gehäusetyps beeinflusst. Weiterhin wird untersucht, wie SiC als Leistungshalbleiter und DAB als Substrat die Zuverlässigkeit beein- flusst. Der Press-Pack ist für Hochleistungsapplikationen von hohem Interesse, da dieses Gehäuse im elektrischen Fehlerfall ohne äußere Unterstützung kurzschliesst. Jedoch ist das Wissen über diese Gehäusetechnologie unter aktiven Lastwechselbedingungen sehr limitiert. Mit Hilfe von Simulationen wird dieses Verhalten untersucht und mögliche Schwachpunkte abgeleitet. Am Ende der Arbeit werden Möglichkeiten untersucht, wie Mithilfe von FEM Simulationen die Lebensdauer von Leistungsmodulen evaluiert werden kann
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Poller, Tilo. "Thermal and thermal-mechanical simulation for the prediction of fatigue processes in packages for power semiconductor devices." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20135.

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The knowledge about the reliability of power electronics is necessary for the design of converters. Especially for offshore applications it is essential to know, which fatigue processes happen and how the lifetime can be estimated. Numerical simulation is an important tool for the development of power electronic systems. This thesis analyse the thermal and thermal-mechanical behaviour of packages for power semiconductor devices with the help of simulations. One topic is the evaluation of different thermal models. The main focus is on the description of the thermal cross-coupling between the devices and the influence to the lifetime estimation. The power module is a well established package for power semiconductor devices. It will be explained how the heating period of power cycles influences the failure mode of this package type. Additionally, it will evaluated how SiC devices and DAB substrates influence the power cycling capability. The press-pack is in focus for high power applications as the package short-circuits during an electrical failure without external auxiliary systems. However, the knowledge about the power cycling behaviour is currently limited. With the help of simulations this behaviour will be analysed and possible weak points will be also derived. In the end of the work it will be discussed, how the lifetime can be estimated with help of FEM simulations.
Für die Entwicklung von Umrichtern ist die Kenntnis über die Zuverlässigkeit der Leistungselektronik ein wichtiges Kernthema. Insbesondere für Offshore-Anwendungen ist das Wissen über die stattfindenden Ermüdungsprozesse und die Abschätzung der zu erwartenden Lebensdauer der Bauteile essentiell. Hierfür hat sich die Simulation als ein wichtiges Werkzeug für die Entwicklung und Lebensdauerbewertung von leistungselektronischen Anlagen etabliert. In der folgenden Arbeit wird das thermische und das thermisch-mechanische Verhalten der Leistungselektronik mittels Simulationen untersucht. Hierzu wird ein Vergleich zwischen verschiedenen thermischen Modellen für Leistungsbauelemente durchgeführt. Schwerpunkt ist die Beschreibung der thermischen Kopplung zwischen den Chips und deren Einfluss auf die Lebensdauerabschätzung. Ein weiterer Schwerpunkt ist das Leistungsmodul, welches sich als ein Standardgehäuse etabliert hat. Dazu wird erklärt, wie die Variation der Einschaltzeit im aktiven Lastwechseltest den Fehlermodus dieses Gehäusetyps beeinflusst. Weiterhin wird untersucht, wie SiC als Leistungshalbleiter und DAB als Substrat die Zuverlässigkeit beein- flusst. Der Press-Pack ist für Hochleistungsapplikationen von hohem Interesse, da dieses Gehäuse im elektrischen Fehlerfall ohne äußere Unterstützung kurzschliesst. Jedoch ist das Wissen über diese Gehäusetechnologie unter aktiven Lastwechselbedingungen sehr limitiert. Mit Hilfe von Simulationen wird dieses Verhalten untersucht und mögliche Schwachpunkte abgeleitet. Am Ende der Arbeit werden Möglichkeiten untersucht, wie Mithilfe von FEM Simulationen die Lebensdauer von Leistungsmodulen evaluiert werden kann.
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Books on the topic "Thermal and mechanical models"

1

1937-, Lenard John G., ed. Thermal-mechanical modelling of the flat rolling process. Berlin: Springer-Verlag, 1991.

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David, Porter. Group interaction modelling of polymer properties. New York: M. Dekker, 1995.

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Awrejcewicz, J. Nonsmooth dynamics of contacting thermoelastic bodies. New York, NY: Springer, 2009.

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Tianjian, Lu, and SpringerLink (Online service), eds. Introduction to Skin Biothermomechanics and Thermal Pain. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity (1997 Bochum, Germany). IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity: Proceedings of the IUTAM symposium held in Bochum, Germany, 25-29 August 1997. Dordrecht: Kluwer Academic Publishers, 1999.

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IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity (1997 Bochum, Germany). IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity: Proceedings of the IUTAM symposium held in Bochum, Germany, 25-29 August 1997. New York: Kluwer Academic Publishers, 2002.

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A, Wirtz R., Lehmann G. L, and American Society of Mechanical Engineers. Heat Transfer Division., eds. Thermal modeling and design of electronic systems and devices: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Dallas, Texas, November 25-30, 1990. New York, N.Y: American Society of Mechanical Engineers, 1990.

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Prasad, N. N. V. Thermomechanical crack growth using boundary elements. Southampton: WIT Press, 1998.

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Awrejcewicz, J. Nonsmooth dynamics of contacting thermoelastic bodies. New York, NY: Springer, 2009.

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Yuriy, Pyr'yev, ed. Nonsmooth dynamics of contacting thermoelastic bodies. New York, NY: Springer, 2009.

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Book chapters on the topic "Thermal and mechanical models"

1

Tamma, Kumar K., and A. Jain. "Thermal Contact Applications: Mechanical Contact Models." In Encyclopedia of Thermal Stresses, 4938–43. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_752.

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Vairo, Giuseppe, and Sami Montassar. "Mechanical Modelling of Stays under Thermal Loads." In Mechanics, Models and Methods in Civil Engineering, 481–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24638-8_34.

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Pietrzyk, Maciej, and John G. Lenard. "One-Dimensional Models of Flat Rolling." In Thermal-Mechanical Modelling of the Flat Rolling Process, 53–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84325-9_3.

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Elizaryev, Alexey, Elina Nasyrova, Carlo Cattani, Denis Tarakanov, Dmitrii Tarakanov, and Ilmir Khasanov. "Mathematical Models for Assessment the Thermal Radiation of a Fireball During Bleve." In Lecture Notes in Mechanical Engineering, 323–33. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85057-9_28.

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Sørensen, B. F., and J. W. Holmes. "Fatigue of Continuous Fiber-Reinforced Ceramic Matrix Composites: Review of Mechanisms and Models." In Fatigue under Thermal and Mechanical Loading: Mechanisms, Mechanics and Modelling, 487–99. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8636-8_50.

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DeVries, Warren R. "Mechanics and Thermal Models for Machining." In Analysis of Material Removal Processes, 39–79. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-4408-0_3.

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Liu, C. D., Y. F. Han, and M. G. Yan. "A Creep Constitutive Model of Dislocation Thermal Activation." In Mechanical Behavior of Materials, 181–87. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1968-6_20.

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Goldman, Alex. "Physical, Mechanical and Thermal Aspects of Ferrites." In Handbook of Modern Ferromagnetic Materials, 581–88. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4917-8_22.

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Polyakov, A. N., and I. P. Nikitina. "Application of Modal Analysis to Building Simulation Models of Thermal Processes in Machine Tools." In Lecture Notes in Mechanical Engineering, 75–84. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54817-9_9.

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Morganti, Manlio Valerio, Stefano Longo, Marko Tirovic, Daniel J. Auger, and Raja Mazuir Shah Bin Raja Ahsan. "Modular Battery Cell Model for Thermal Management Modelling." In Lecture Notes in Mechanical Engineering, 87–102. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75677-6_8.

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Conference papers on the topic "Thermal and mechanical models"

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Murga, Gaizka, Heather Marshall, LeEllen Phelps, Ana Hervás, and Ibon Larracoechea. "ATST enclosure mechanical and thermal models." In Integrated Modeling of Complex Optomechanical Systems, edited by Torben Andersen and Anita Enmark. SPIE, 2011. http://dx.doi.org/10.1117/12.915575.

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Pinheiro Ramos, Nícolas, Luís Felipe dos Santos Carollo, and Sandro Metrevelle Marcondes de Lima e Silva. "Comparison of Different Thermal Models to Estimate Thermal Properties." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-1150.

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Manin, Lionel, and Daniel Play. "Thermal Behavior Evaluation During Mechanical Design: Validation of Thermal Numerical Gearbox Models." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14457.

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Abstract In todays mechanical design, static and dynamic numerical models are widely used, and thermal models are needed to make robust design. Thermal models, based on the thermal network method, are now available. Several hypotheses are made as physical phenomena are complex and experimental validation is necessary. A thermal model of gearbox has been already presented and compared to few experimental results that had allowed global validation of the model. Now, the experimental validation is concerned with thermal transient and steady state behavior of gearbox versus transmitted power and lubrication conditions in order to finely validate the model. The test gearbox is compound of 3 spur gears supported by 6 spherical roller bearings, a housing and a lubrication circuit cooled by an oil-air exchanger. The maximum transmitted power is 500 kW. Gears, bearings, housing, shafts, and the lubrication circuit have been equipped with thermocouples, flux-meters and flow-meters. Heat flux were measured on the internal and external side walls of the housing. Oil flowing on a side wall has been measured. Experiments were run under several transmitted powers and oil flows at meshing. Thermal map at steady state and transient temperature rises of technological elements are obtained for each test. Finally, transient temperature rises and steady state from numerical and experimental results are compared. The comparison shows a good agreement, and the importance of taking into account oil flowing on the inside walls of the housing is brought to the fore. The difficulty of evaluating the oil flowing on the internal walls of a housing is discussed and illustrated with numerical results.
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Subramanian, Sankara J. "Mechanical Modeling of a Solder Thermal Interface Material: Implications for Thermo-Mechanical Reliability." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73304.

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This paper addresses cracking in solder thermal interface materials (STIMs) used in electronic packages under accelerated testing or service conditions. Finite-element models of various packages have been built to study the deformation in the STIM through a few cycles of accelerated testing. Two commonly observed failure modes — center/off-center brittle interfacial cracking, and cohesive corner cracking — were looked at. The success of the modeling approach was evaluated by comparison with thermal impedance data, as well as with CSAM images showing the extent of cracking in the STIM. It is shown that the models agree qualitatively with experimental data, both in terms of failure locations, as well as in terms of rank ordering different packages in terms of STIM degradation.
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Sharifpur, Mohsen, Tshimanga Ntumba, and Josua P. Meyer. "Parametric Analysis of Effective Thermal Conductivity Models for Nanofluids." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85093.

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There is a lack of reported research on comprehensive hybrid models for the effective thermal conductivity of nanofluids that takes into consideration all major mechanisms and parameters. The major mechanisms are the nanolayer, Brownian motion and clustering. The recognized important parameters can be the volume fraction of the nanoparticles, temperature, particle size, thermal conductivity of the nanolayer, thermal conductivity of the base fluid, PH of the nanofluid, and the thermal conductivity of the nanoparticle. Therefore, in this work, a parametric analysis of effective thermal conductivity models for nanofluids was done. The impact of the measurable parameters, like volume fraction of the nanoparticles, temperature and the particle size for the more sited models, were analyzed by using alumina-water nanofluid. The result of this investigation identifies the lack of a hybrid equation for the effective thermal conductivity of nanofluids and, consequently, more research is required in this field.
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Delprete, Cristiana, Carlo Rosso, and Raffaella Sesana. "Damage Criterions in Thermo-Mechanical Fatigue Models." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95470.

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In the present paper different damage criterions, recorded in literature, are compared, distinguishing the philosophical approach to thermo-mechanical fatigue (TMF) in energetic methods and phenomenological methods. TMF is the combination of mechanical and thermal stresses that takes place in most of mechanical components, especially in automotive engines. The presence of thermal together with mechanical cycling can worsen fatigue and ageing phenomena. In order to describe the TMF behavior of a material or of a component it is necessary to take into account different phenomena contributing to progressive damage as plastic strain, thermal strain, creep and oxidation. In literature it is possible to find different definitions of damage: strain accumulated energy, volume unit damage, residual life. Many papers on TMF are available like experimental studies, analytical investigations, analytical models of damage, life prediction models. The present paper aims to make a first selection of TMF life assessment criteria by means of literature critical analysis. Then, by means of numerical model of actual TMF component, i.e. an exhaust manifold, a comparison between the selected methods is done. Using a set of experimental and numerical analyses of exhaust manifolds collected in literature papers, a comparison and results discussion are done.
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Cummings, Scott M., Tom McCabe, and Dan Gosselin. "Brake Shoes and Thermal Mechanical Shelling." In ASME 2008 Rail Transportation Division Fall Technical Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/rtdf2008-74016.

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The Wheel Defect Prevention Research Consortium (WDPRC) conducted a review of existing brake shoe tests to explore the combinations of brake shoe force, time, and wheel/brake shoe coefficient of friction (COF) needed to achieve the temperatures of concern for thermal mechanical shelling (TMS). Data was found involving normally expected brake shoe forces applied to a dynamometer wheel and a variety of test parameters and procedures. All temperatures were measured using a sliding thermocouple pressed lightly against the wheel tread. All testing reported involved new brake shoes that may have different COF properties from used brake shoes. Tests included brake shoe tests conducted in accordance with the Association of American Railroads (AAR) M-926 specification, constant horsepower tests, and simulated stuck brake tests. Tread conditioning brake shoes were investigated, as well as high friction composition brake shoes. Findings from these tests include the following: • Tread conditioning brake shoes produced lower wheel tread temperatures compared to high-friction composition brake shoes. The magnitude of this difference varied depending on the test conditions; • In the dynamometer test most closely simulating revenue service conditions, 37 kW (50 hp) was required to heat wheels above 316°C (600°F); • Different models of high-friction composition brake shoes produced similar wheel temperatures under the parameters of the AAR M-926 tests. The range of average wheel temperatures produced by different models of high-friction composition brake shoes was only about 28°C (50°F) at any point during the test; • Individual brake shoes of the same model usually produced consistent results with respect to wheel temperature. Two exceptions to this statement were observed in the AAR M-926 test results. In a laboratory dynamometer test involving service damaged wheels, the WDPRC was unable to produce any measurable reduction in wheel tread defect size through the application of tread conditioning brake shoes. However, four service trials of tread conditioning brake shoes showed potential benefits in using tread conditioning brake shoes to reduce the number of wheelsets removed for tread damage.
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Bardot, D. M., and A. F. Emery. "Development of Complex Thermal Models Using Global Sensitivity and MCMC." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13010.

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In order to simulate the behavior of a thermal protection system exposed to a sudden heat flux it was necessary to develop a model of the thermal degradation of the insulating foam. The model was based upon measured mass losses, Thermal Gravimetric Analysis (TGA) data. Models can range from the simplest one chemical reaction to a complex, pressure dependent lattice model incorporating as many as sixteen reactions. The paper describes the development of a model, calibration using a fixed set of data, an analysis of the sensitivity based upon the concepts of global sensitivity and the evaluation of the uncertainty of estimated parameters.
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Homan, K. O. "Second Law Aspects of Simplified Models for Sensible Thermal Storage." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1335.

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Abstract This paper presents results for entropy generation during the inflow of a low temperature stream into a sensible thermal storage vessel initially filled with a uniformly high temperature liquid. The level of internal entropy generation due to thermal mixing between the cold and hot liquid corresponds to losses in the usable fraction of the stored volume and therefore decreased efficiency. Empirically, the observed behavior of sensible storage devices spans the range of nearly mixed to well stratified. In this investigation, analytical models for these two limits, the fully mixed and ideally stratified conditions, are used to bound the entropy generation levels of the observed behaviors. A numerical model for stratified storage systems based on the one-dimensional convective energy equation which accounts for aspects of the observed thermal mixing is then examined in relation to the afore-mentioned limits. The results show that even at moderate throughflow rates, the fully mixed and ideally stratified limits are separated by orders of magnitude in terms of entropy generated. The empirically-based numerical model exhibits mixing levels midway between these two limits and thereby underscores the potential for significant improvements in efficiency. Examination of the numerical model shows the crucial importance of resolving the evolution of the interior thermal layer and the boundary heat fluxes in computing the entropy generation.
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Batson, Jennifer, and Ab Hashemi. "Precision Modular Thermal Deformation Modeling." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80171.

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The thermal response test of payloads in a vacuum chamber, commonly referred to as TVAC, is one of the most widely used performance characterizations of the payload in the aerospace industry. This verification test almost always requires modeling and validation of the performance of the payload under operational and off-design mission scenarios. To obtain high-precision performance predictions, the thermal analyst must accurately model the chamber environment, including any temperature variation along the shroud. Then, the subsystems that have already been modeled and tested are integrated into a larger assembly and tested at the system level. Using a modular technique, the analyst can preserve the subsystem models and the chamber seamlessly and develop an integrated model for the test configuration. Also, since many subsystems or components are similar in configuration, but different in size, the need for models amenable to scaling without recreating the thermal boundary conditions and couplings in the model are required. This paper describes a methodology that was developed for adaptive integrated modular modeling for precision thermo-structural analysis of optics. The details of the modeling technique are explained using the thermal vacuum test chamber with two scaleable payloads. This methodology is not limited to the problem described here and is fully relevant to a wide range of applications.
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Reports on the topic "Thermal and mechanical models"

1

Liu, H. H., L. Li, L. Zheng, J. E. Houseworth, and J. Rutqvist. Investigations of Near-Field Thermal-Hydrologic-Mechanical-Chemical Models for Radioactive Waste Disposal in Clay/Shale Rock. Office of Scientific and Technical Information (OSTI), June 2011. http://dx.doi.org/10.2172/1050698.

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Corona, Edmundo, Sharlotte Kramer, Brian Lester, Amanda Jones, Brett Sanborn, Lyndsay Shand, and Carter Fietek. Thermal-Mechanical Elastic-Plastic and Ductile Failure Model Calibrations for 304L Stainless Steel Alloy. Office of Scientific and Technical Information (OSTI), February 2021. http://dx.doi.org/10.2172/1769256.

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Corona, Edmundo, Sharlotte Kramer, Brian Lester, Amanda Jones, Brett Sanborn, and Carter Fietek. Thermal-Mechanical Elastic-Plastic and Ductile Failure Model Calibrations for 6061-T651 Aluminum Alloy from Plate. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1772885.

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Rushton, J. D., G. L. Jones, E. L. Leaver, and W. Morton. Development and demonstration of the use of modular thermo-mechanical pulpmill simulation models to develop energy reduction strategies. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5166816.

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Berge, P. A., S. C. Blair, R. J. Shaffer, and H. F. Wang. Evaluation of models for estimating changes in fracture permeability due to thermo-mechanical stresses in host rock surrounding a potential repository. Office of Scientific and Technical Information (OSTI), February 1997. http://dx.doi.org/10.2172/3844.

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Ків, Арнольд Юхимович, Володимир Миколайович Соловйов, and Sergey A. Tomilin. Formation of Si precipitates іn neutron irradiated Al. Видавничий відділ КДПУ, 2001. http://dx.doi.org/10.31812/0564/1027.

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Transmutation reactions are the unique way to get a large concentration of Silicon atoms in Aluminum lattice, and just in substitutional positions. Appearing Silicon atoms in Aluminum lattice instead of Aluminum atoms leads to arising of mechanical stresses. This factor is the keystone of the model, which allows to explain the main peculiarities of Si precipitate creation in Aluminum irradiated by thermal neutrons. First, we shall describe the qualitative peculiarities of the model. Then we shall perform some quantitative estimates. At last the model will be discussed and compared with experimental data.
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Roberson, Madeleine, Kathleen Inman, Ashley Carey, Isaac Howard, and Jameson Shannon. Probabilistic neural networks that predict compressive strength of high strength concrete in mass placements using thermal history. Engineer Research and Development Center (U.S.), June 2022. http://dx.doi.org/10.21079/11681/44483.

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This study explored the use of artificial neural networks to predict UHPC compressive strengths given thermal history and key mix components. The model developed herein employs Bayesian variational inference using Monte Carlo dropout to convey prediction uncertainty using 735 datapoints on seven UHPC mixtures collected using a variety of techniques. Datapoints contained a measured compressive strength along with three curing inputs (specimen maturity, maximum temperature experienced during curing, time of maximum temperature) and five mixture inputs to distinguish each UHPC mixture (cement type, silicon dioxide content, mix type, water to cementitious material ratio, and admixture dosage rate). Input analysis concluded that predictions were more sensitive to curing inputs than mixture inputs. On average, 8.2% of experimental results in the final model fell outside of the predicted range with 67.9%of these cases conservatively underpredicting. The results support that this model methodology is able to make sufficient probabilistic predictions within the scope of the provided dataset but is not for extrapolating beyond the training data. In addition, the model was vetted using various datasets obtained from literature to assess its versatility. Overall this model is a promising advancement towards predicting mechanical properties of high strength concrete with known uncertainties.
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Hosemann, Peter, Julie Tucker, and David Cahill. Developing a Macro-scale SiC-cladding Behavior Model Based on Localized Mechanical and Thermal Property Evaluation on Pre- and Post-Irradiation SiC-SiC Composites (Final Report). Office of Scientific and Technical Information (OSTI), March 2019. http://dx.doi.org/10.2172/1523193.

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Mohanty, Subhasish, and Joseph Listwan. Development of Digital Twin Predictive Model for PWR Components: Updates on Multi Times Series Temperature Prediction Using Recurrent Neural Network, DMW Fatigue Tests, System Level Thermal-Mechanical-Stress Analysis. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1822853.

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Buscheck, T. ,. LLNL. Thermal-hydrological models. Office of Scientific and Technical Information (OSTI), April 1998. http://dx.doi.org/10.2172/654332.

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