Articles de revues : « Thermo Mechanical system »

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Venkatesan, J., S. P. Chidambaram, G. Nagarajan, Anand Suresh et K. Saravanan. « Analysis of Thermo-Mechanical Behaviour of Air Compressor in Automotive Braking System ». International Journal of Materials, Mechanics and Manufacturing 6, n^o 3 (juin 2018) : 233–37. http://dx.doi.org/10.18178/ijmmm.2018.6.3.382.

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Kim, Sang-Woo, Dawit Zenebe Segu et Seock-Sam Kim. « The Thermo-mechanical Cracking Analysis of Break System ». Procedia Engineering 68 (2013) : 586–92. http://dx.doi.org/10.1016/j.proeng.2013.12.225.

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Guo, Jianxia. « Calculation accuracy of mathematical homogenization method for thermo-mechanical coupling problems ». Thermal Science 25, n^o 4 Part B (2021) : 2957–64. http://dx.doi.org/10.2298/tsci2104957g.

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The paper analyzes the thermo-mechanical couplinag phenomenon under the condition of sliding contact, establishes the finite element analysis continuous model of thermo-mechanical coupling, and proposes the system dynamic equilibrium equation and thermodynamic equilibrium equation. The article analyzes the contact conditions between the objects in the system and obtains the objects? contact conditions? mathematical expression. On this basis, the constraint function is used to express the mathematical homogenization. We apply the variation principle to the constraint function and form a non-linear equation group with the system balance equation solve the thermal-mechanical coupling problem. The example shows that we use the constraint function method to solve the thermo-mechanical coupling problem, which has good convergence, stable algorithm, and the calculation result can reflect the actual situation.

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Zeinali, Seyed Morteza, et Sherif L. Abdelaziz. « Identifying thermo-mechanical induced microstructural changes ». E3S Web of Conferences 205 (2020) : 09005. http://dx.doi.org/10.1051/e3sconf/202020509005.

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Robust engineering of geomaterials for energy applications requires a clear understanding of the impacts of temperatures and pressures applied to the soil on their microstructures. Such understandings will facilitate better designs of new geomaterials and technologies via ensuring accurate assessments of the performance of the existing ones. In this study, we assess the changes in the microstructure—specific surface area and pore size distribution—of a saturated clay subjected to stress and temperature cycle. Clay specimens were subjected to the desired mechanical stresses and thermal cycles in a triaxial system. Then, the specimens were swiftly extracted from the triaxial, flush frozen in liquid nitrogen, then freeze-dried to preserve their microstructure. The preserved specimens were then used for specific surface area and pore size distribution assessments using nitrogen (N2)-gas adsorption and mercury intrusion porosimetry. The results established qualitative explanations of the expected microstructural changes in geomaterials under operational conditions, which facilitate the development of new geomaterials that can overcome such alternations.

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Ouyang, C. « On crack propagation in a nonlinear coupled thermo-mechanical system ». Mathematical Modelling 8 (1987) : 519–23. http://dx.doi.org/10.1016/0270-0255(87)90636-1.

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Wang, Songke, Xiang Ji, Yuntao Song, Shanwen Zhang, Zhongwei Wang, Youwen Sun, Minzhong Qi, Xufeng Liu, Shengming Wang et Damao Yao. « Thermo-mechanical analysis of RMP coil system for EAST tokamak ». Fusion Engineering and Design 89, n^o 7-8 (octobre 2014) : 991–95. http://dx.doi.org/10.1016/j.fusengdes.2014.03.087.

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Saaly, Maryam, Pooneh Maghoul et Hartmut Holländer. « Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles ». E3S Web of Conferences 205 (2020) : 05010. http://dx.doi.org/10.1051/e3sconf/202020505010.

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Harvesting geothermal energy through the use of thermo-active pile systems is an eco-friendly technique to provide HVAC energy demand of buildings. Mechanical behaviour of thermo-active piles is impacted by thermal cycles. Moreover, in urban areas, the temperature of the ground is higher than non-constructed areas due to the heat loss through the below-grade enclosure of buildings. This heat dissipation increases the thermal capacity of the soil and affects the mechanical response of the geothermal pile foundation subjected to thermo-mechanical loading. To investigate the effect of buildings heat loss on thermo-active piles, a numerical thermo-mechanical (TM) analysis was carried out on a proposed energy foundation system for an institutional building, the Stanley Pauley Engineering Building (SPEB) in the campus of the University of Manitoba, Winnipeg, Canada. The mechanical response of the geothermal piles to the thermal cycles with and without considering heat leakage through the basement of the SPEB is compared. Results showed that the cooling loads induced a maximum vertical pile head displacement of -1.18 mm. After 5 years operation of the system, the maximum vertical pile head displacement decreased to -1.05 mm for the case in which heat loss through the basement in considered in the models. In addition, the maximum axial load effective along the pile axis was 6% higher for the case that considers heat loss through the basement compared to the case without considering heat leakage through the building’s below-grade envelope.

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Le Mercier, Kevin, Michel Watremez, Laurence Fouilland, Jean Dominique Guérin et Laurent Dubar. « Thermo-Mechanical Behaviour of Spheroidal Graphite Iron ». Key Engineering Materials 611-612 (mai 2014) : 1250–57. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.1250.

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The main objective of this paper is to identify the thermo-mechanical behaviour of the spheroidal graphite (SG) iron EN-GJS-700. In the first instance, compression tests are carried out using Gleeble 3500 system enabling a precise control on testing temperature and strain rate. The effects of these testing parameters on the SG iron behaviour are studied. Through this, the occurrence of dynamic recrystallization phenomenon is highlighted. Specific rheological models based on metallurgy are introduced. Finally, shear tests on hat shaped specimens are performed to reach higher strain rates.

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Ignaszak, Zenon, et Paweł Popielarski. « Sensitivity Tests of Simulation Models Used in Chosen Calculation Codes on Uncertainty of Thermo-Mechanical Parameters during Virtual Mechanical Stress Estimation for Ferrous Alloy Castings ». Defect and Diffusion Forum 312-315 (avril 2011) : 758–63. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.758.

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Simulation systems used for many years in foundry industry such as MAGMASOFT, NovaFlow&Solid and ProCAST, contain thermo-mechanical modules permitting the estimation of mechanical stresses and hot tears appearing in casting during its cooling. It is also known that these modules are rarely used because of the very limited thermo-mechanical database especially for ceramic materials such as foundry sand moulds. These technologies – castings pouring in non-permanent sand moulds, particularly iron alloys are most often applied in foundry. In our study the method of evaluating the algorithms quality applied in thermo-mechanical phenomena models based on parameters sensitivity testing from the proper database of the simulation system was used [1]. The comparative analyses of both experimental and virtual results were realized (by stress estimation). The methodology of experimental research was similar to that described where gray cast iron castings of stress bars (grid) were casted in sand mould bonded by organic resins.

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Lv, Jun, Minjie Shao, Yuting Xue, Xiaowei Gao et Zhaoqian Xie. « A New Strong Form Technique for Thermo-Electro-Mechanical Behaviors of Piezoelectric Solids ». Coatings 11, n^o 6 (8 juin 2021) : 687. http://dx.doi.org/10.3390/coatings11060687.

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Piezoelectric materials are widely fabricated and investigated for potential applications in microelectromechanical systems as direct converters between mechanical and electrical signals, where some show pyroelectric features involving thermo-electro-mechanical interactions. This study aimed to introduce a novel numerical technique to predict the thermo-electro-mechanical behaviors of piezoelectric structures, based on a strong-form numerical framework called the element differential method. In this method, the shape functions of the isoparametric element and their first two derivatives were derived analytically by interpolating the temperature, displacement, and electric potentials. Then, a point collocation method based on node positions in the elements was proposed to generate the final system of equations without any domain integrations. Thus, the coupled behaviors of thermal piezoelectric structures, including the pyroelectric features, can be simulated by the strong-form formulation of the governing equations. Several numerical examples, including the piezoelectric composites structures, are presented, and the coupled thermo-electro-mechanical responses have been analyzed to validate the proposed method.

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Navi, Parviz, et Antonio Pizzi. « Property changes in thermo-hydro-mechanical processing ». Holzforschung 69, n^o 7 (1 septembre 2015) : 863–73. http://dx.doi.org/10.1515/hf-2014-0198.

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Abstract Thermo-hydro-mechanical (THM) treatment is a combined action of temperature, moisture, and mechanical force, which leads to modified wood (THMW). Various types of eco-friendly THM processes have been developed to enhance wood properties and generate new materials, such as welding, densification, molding, bending, profiling, artificial aging, panel manufacture, and surface densification. The various transformation processes in the course of THM bring about positive effects in terms of the mechanical and physical properties as well as the biological durability. To the negative effects belong the loss in strength and fracture toughness, and one of the challenges is to minimize these negative aspects. The present paper reviews the chemical transformations processes during THM treatment in a closed processing system and presents the relationship between processing parameters and THMW properties. The discussion includes the problems associated with eliminating the set recovery of densified wood by THM posttreatments and the chemical origin of the relaxation of internal stresses induced by densification.

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Mace, Fabien, Jian Ping Lin et Jun Ying Min. « Thermo-Mechanical Analysis of a Cooling System for Hot Stamping Tools ». Advanced Materials Research 538-541 (juin 2012) : 2053–60. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2053.

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Several studies and design of cooling systems for hot stamping tools have already been made. The phase transformations which occur during the process are known, and numerical simulations are now very close to the reality [1]. However these studies are often related to a specific part and can hardly be extrapolated to other parts. This paper presents several results based on a thermo-mechanical analysis which can be used to make a first design of a cooling system for hot stamping tool. A theoretical study describes the heat transfer from the tools to the cooling pipes related to different flow parameters. Numerical simulation with the software COMSOL Multiphysics has been carried out to obtain results about cooling rate and maximum stress into the tool against geometry parameters. The heat transfer model used for simulation has been validated through experiment. To finish a data analysis describes the relationship between the different parameters, more specifically their impact on the cooling. With this study we can now determine which pipes’ location and size and flow properties are likely to provide the most efficient cooling system, and which parameter we must modify to optimize it.

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Zhai, Xinle, et Kamelia Atefi-Monfared. « Impact of local thermal non-equilibrium on temporal thermo-hydro-mechanical processes in low permeable porous media ». E3S Web of Conferences 205 (2020) : 09012. http://dx.doi.org/10.1051/e3sconf/202020509012.

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The thermo-hydraulic-mechanical (THM) response of low permeable media is of crucial significance in thermal fracturing for production of unconventional shale oil, enhanced geothermal systems, and waste disposal. During such processes, pore pressures and stresses change in a spatiotemporal manner due to hydraulic and thermal loadings. From the viewpoint of the energy balance equation, the available theoretical studies can be classified as local thermal equilibrium (LTE), and local thermal non-equilibrium (LTNE) models. LTE models consider identical temperature for different phase of the porous system. LTNE models allow different temperature variations in solid and fluid phases of a porous medium. Current LTNE studies are weakly-coupled – not incorporating thermo-osmosis. This paper presents novel coupled LTNE thermo-poroelastic solutions in a transversely isotropic saturated porous medium, incorporating thermo- osmosis effect. Solutions are obtained for permeable and impermeable boundaries. Thermo-osmosis is found to have a very different effect in case of LTNE versus LTE, resulting in a fundamentally different THM response. LTNE effect analysis reveals different THM responses under different heat transfer properties at the solid-fluid interface in low permeable strata.

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Eichhorn Colombo, Konrad W., et Vladislav V. Kharton. « Start-Up of a Solid Oxide Fuel Cell System with a View to Materials Science-Related Aspects, Control and Thermo-Mechanical Stresses ». Crystals 11, n^o 7 (24 juin 2021) : 732. http://dx.doi.org/10.3390/cryst11070732.

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The start-up of a solid oxide fuel cell (SOFC) is investigated by means of numerical simulation with a view to material and operational constraints on a component and system level, as well as thermo-mechanical stresses. The applied multi-physics modeling approach couples thermal-, electrochemical, chemical-, and thermo-mechanical phenomena. In addition to constraints, emphasis is given to degrees of freedom with respect to manipulated and controlled variables of the system. Proper ramping during the start-up procedure keeps critical parameter values within a safe regime. Of particular interest are gradient in terms of temperature and chemical concentrations. Nevertheless, simulations show that thermo-mechanical stresses are relatively high during the initial start-up phase, the system is, thus, more susceptible to failure. The combination of multi-physics modeling in conjunction with practical control aspects for start-up of an SOFC, which is presented in this paper, is important for applications.

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Hailemariam, Henok, et Frank Wuttke. « Cyclic mechanical stability of thermal energy storage media ». E3S Web of Conferences 205 (2020) : 07008. http://dx.doi.org/10.1051/e3sconf/202020507008.

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Closing the gap between supply and demand of energy is one of the biggest challenges of our era. In this aspect, thermal energy storage via borehole thermal energy storage (BTES) and sensible heat storage systems has recently emerged as a practical and encouraging alternative in satisfying the energy requirements of household and industrial applications. The majority of these heat energy storage systems are designed as part of the foundation or sub-structure of buildings with load bearing capabilities, hence their mechanical stability should be carefully studied prior to the design and operation phases of the heat storage system. In this study, the cyclic mechanical performance of a commercial cement-based porous heat storage material is analyzed under different amplitudes of cyclic loading and medium temperatures using a recently developed cyclic thermo-mechanical triaxial device. The results show a significant dependence of the cyclic mechanical behavior of the material, such as in the form of cyclic axial and accumulated plastic strains, on the different thermo-mechanical loading schemes.

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Choudhury, A., S. C. Mondal et S. Sarkar. « Failure Analysis of Laminated Composite Plate Under Hygro-Thermo Mechanical Load and Optimisation ». International Journal of Applied Mechanics and Engineering 24, n^o 3 (1 août 2019) : 509–26. http://dx.doi.org/10.2478/ijame-2019-0032.

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Abstract Failure analysis of laminated composite plates for different mechanical, thermo mechanical and hygro-thermo mechanical loads for different ply thicknesses, stacking sequences, fiber orientation angles and composite material systems is presented in the paper. A comparative study of different failure theories is also presented in the paper. The effect of fiber orientation angles on the first ply failure load is also studied. A hybrid composite laminate is developed based on the first ply failure load which minimizes weight and cost. The last ply failure load based on fully discounted method is calculated for different stacking sequences. An optimum composite material system and laminate layup is studied for a targeted strength ratio which minimizes weight.

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Collin, E. « Mesoscopic quantum thermo-mechanics : A new frontier of experimental physics ». AVS Quantum Science 4, n^o 2 (juin 2022) : 020501. http://dx.doi.org/10.1116/5.0086059.

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In the last decade, experimentalists have demonstrated their impressive ability to control mechanical modes within mesoscopic objects down to the quantum level: it is now possible to create mechanical Fock states, to entangle mechanical modes from distinct objects, and to store quantum information or transfer it from one quantum bit to another, among the many possibilities found in today's literature. Indeed, mechanics is quantum, very much like spins or electromagnetic degrees of freedom; and all of this is, in particular, referred to as a new engineering resource for quantum technologies. However, there is also much more beyond this utilitarian aspect: invoking the original discussions of Braginsky and Caves, where a quantum oscillator is thought of as a quantum detector for a classical field, namely, a gravitational wave, which is also a unique sensing capability for quantum fields. The subject of study is then the baths to which the mechanical mode is coupled to, let them be known or unknown in nature. This Perspective is about this new potentiality that addresses stochastic thermodynamics, potentially down to its quantum version, the search for a fundamental underlying (random) field postulated in recent theories that can be affiliated to the class of the wave-function collapse models, and more generally open questions of condensed matter like the actual nature of the elusive (and ubiquitous) two-level systems present within all mechanical objects. However, such research turns out to be much more demanding than the use of a few quantum mechanical modes: all the known baths have to be identified, experiments have to be conducted in-equilibrium, and the word “mechanics” needs to be justified by a real ability to move substantially the center-of-mass when a proper drive tone is applied to the system.

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Radosavljevic, Marco, et Stuart Holdsworth. « Novel induction heating system for service cycle thermo-mechanical fatigue testing ». Materials at High Temperatures 26, n^o 4 (décembre 2009) : 369–74. http://dx.doi.org/10.3184/096034009x12563979940798.

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Kitazawa, R., M. Tanaka, Y. Kagawa et Y. F. Liu. « Damage evolution of TBC system under in-phase thermo-mechanical tests ». Materials Science and Engineering : B 173, n^o 1-3 (octobre 2010) : 130–34. http://dx.doi.org/10.1016/j.mseb.2009.12.022.

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Watanabe, M., T. Masuda, Y. Ashibe, M. Hirose, S. Isojima, S. Honjo, T. Uchiyama, M. Shimodate, Y. Takahashi et H. Suzuki. « Thermo-mechanical properties of a 66 kV superconducting power cable system ». IEEE Transactions on Appiled Superconductivity 13, n^o 2 (juin 2003) : 1956–59. http://dx.doi.org/10.1109/tasc.2003.812948.

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Li, Qi, Zhishen Wu, Yilong Bai, Xiangchu Yin et Xiaochun Li. « Thermo-hydro-mechanical Modeling of CO2 Sequestration System Around Fault Environment ». Pure and Applied Geophysics 163, n^o 11-12 (décembre 2006) : 2585–93. http://dx.doi.org/10.1007/s00024-006-0141-z.

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Sommer, Johann-Peter, Olaf Wittler, Dionysios Manessis et Bernd Michel. « Thermo-mechanical analysis of advanced electronic packages in early system design ». Microsystem Technologies 12, n^o 1-2 (19 novembre 2005) : 75–81. http://dx.doi.org/10.1007/s00542-005-0024-8.

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Guo, Qi, Suian Wang, Wenzhi Hui, Yuanchen Li et Zonghong Xie. « Thermo-mechanical optimization of metallic thermal protection system under aerodynamic heating ». Structural and Multidisciplinary Optimization 61, n^o 2 (20 août 2019) : 819–36. http://dx.doi.org/10.1007/s00158-019-02379-4.

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Ghayesh, Mergen H., Siavash Kazemirad, Mohammad A. Darabi et Pamela Woo. « Thermo-mechanical nonlinear vibration analysis of a spring-mass-beam system ». Archive of Applied Mechanics 82, n^o 3 (17 juin 2011) : 317–31. http://dx.doi.org/10.1007/s00419-011-0558-4.

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Körner, Claudia, et Wolfgang Seemann. « Thermo-mechanical behaviour of X-ray masks in micro system technology ». PAMM 9, n^o 1 (décembre 2009) : 371–72. http://dx.doi.org/10.1002/pamm.200910159.

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Sakai, Eiichi. « Direct Thermal Full Color Recording System(Thermo-Autochrome System). » JAPAN TAPPI JOURNAL 48, n^o 10 (1994) : 1296–305. http://dx.doi.org/10.2524/jtappij.48.1296.

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Papadatu, Carmen Penelopi, Andrei Victor Sandu, Marian Bordei et Ioan Gabriel Sandu. « Study on the Influence of the Treatment in Magnetic Field on the Nitrided Layer in Plasma ». Revista de Chimie 68, n^o 4 (15 mai 2017) : 675–79. http://dx.doi.org/10.37358/rc.17.4.5528.

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These researches have been made in order to improve the mechanical properties of a Chromium�Molybdenum alloyed steel non-conventionally treated in a magnetic field. Through the thermo-magnetic treatments, applied before thermo-chemical treatment, the mechanical properties of this material have been improved, especially in the case of a great content of chromium. The hardness values of the superficial layers which have been obtained after a complex system of thermo-magnetic treatments followed by a thermo-chemical treatment, the superficial layers content and the behaviour of the steel at the wear through dry friction tests were used as criterion. The paper is a review of the researches from the last few years.

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Ouafik, Youssef. « Modelling and simulation of a dynamic contact problem in thermo-piezoelectricity ». Engineering and Applied Science Letters 4, n^o 2 (29 juin 2021) : 43–52. http://dx.doi.org/10.30538/psrp-easl2021.0069.

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In this work, we numerically study a dynamic frictional contact problem between a thermo-piezoelectric body and a conductive foundation. The linear thermo-electro-elastic constitutive law is employed to model the thermo-piezoelectric material. The contact is modelled by the Signorini condition and the friction by the Coulomb law. A frictional heat generation and heat transfer across the contact surface are assumed. The heat exchange coefficient is assumed to depend on contact pressure. Hybrid formulation is introduced, it is a coupled system for the displacement field, the electric potential, the temperature and two Lagrange multipliers. The discrete scheme of the coupled system is introduced based on a finite element method to approximate the spatial variable and an Euler scheme to discretize the time derivate. The thermo-mechanical contact is treated by using an augmented Lagrangian approach. A solution algorithm is discussed and implemented. Numerical simulation results are reported, illustrating the mechanical behavior related to the contact condition.

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Szparaga, Łukasz, Piotr Myśliński, Adam Gilewicz et Jerzy Ratajski. « Investigations on the Thermo-Mechanical Properties of CrN/CrCN Gradient Coatings Using a Thermo-Dilatometric Method ». Solid State Phenomena 223 (novembre 2014) : 100–109. http://dx.doi.org/10.4028/www.scientific.net/ssp.223.100.

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The paper describes issues related to the use of dilatometric methods for the study of thermo-mechanical properties of PVD gradient coatings. Tests were conducted on three types of CrCN / CrN coatings, which differed in the nature of the change of physico-chemical parameters in the gradient transition layer, deposited on a molybdenum substrate with the use of the cathodic arc evaporation method. The scope of the experimental studies included an analysis of the changes of the thermal “extortion” of the substrate – PVD coating system during annealing processes. In parallel, for comparison purposes, a mathematical description was proposed of gradient coatings containing the transition functions of material parameters. These functions describe the changes of such parameters as the Young's modulus, the Poisson's ratio, the thermal expansion coefficient, and the density as a function of spatial variables. Using the mathematical description proposed, numerical calculations of the state of thermal stress and strain for coatings are represented, respectively, by the transition function forms (a stepped, square, and square root) were carried via FEM. Based on the experimental and computational results obtained, the comparison between the elongation of the tested samples, and the state of thermal stress and strain in the substrate-gradient coating systems analysed were all specified.

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Reddy Kukutla, Pol, et BVSSS Prasad. « Network analysis of a coolant flow performance for the combined impingement and film cooled first-stage of high pressure gas turbine nozzle guide vane ». Proceedings of the Institution of Mechanical Engineers, Part G : Journal of Aerospace Engineering 233, n^o 6 (16 avril 2018) : 1977–89. http://dx.doi.org/10.1177/0954410018767290.

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The present paper describes a system-level thermo-fluid network analysis for the secondary air system analysis of a typically film-cooled nozzle guide vane with multiple actions of jet impingement. The one-dimensional simulation was done with the help of the commercially available Flownex 2015 software. The system-level thermo-fluid network results were validated with both the computational fluid dynamics results and experimentally available literature. The entire nozzle guide vane geometry was first mapped to a thermo-fluid network model and the pressure conditions at different nodes. The discharge and heat transfer coefficients obtained from the Ansys FLUENT were specified as inputs to the thermo-fluid network model. The results show that the one-dimensional simulation of the coolant mass flow rates and jet Nusselt number values are in good agreement with the three-dimensional computational fluid dynamics results.

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Roman, Krisztina, et Gabriella Zsoldos. « MEASUREMENTS OF RHEOLOGYCAL AND MECHANICAL-, THERMO-MECHANICAL PROPERTIES OF PVC/CORN COB FOAM COMPOSITE ». International Journal of Research -GRANTHAALAYAH 5, n^o 10 (31 octobre 2017) : 313–21. http://dx.doi.org/10.29121/granthaalayah.v5.i10.2017.2307.

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In this paper, the modification of PVC/Corn cob blends was investigated. Rheological and diffusion properties of blends are important to learn the behavior of blend’s in molten state, because it will provide information necessary for the processing. Nowadays, the development of biomaterials has become a primary goal for material engineers. Using materials from natural sources gives an option to modify PVC structures and properties. The following mechanical properties of the prepared composite were determined; tensile-, bending strength and hardness. The PVC/Corn cob blends have increased impact strength and the other mechanical properties can be improved as well. The relationship between the morphology and properties of the foam were also investigated. The result of DSC and dynamic mechanical analysis showed that the blends form a partially compatible system. The rheological analysis showed that the PVC composite with corn cob could be processed and recycled using regular thermoplastic processing systems.

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Basińska, Małgorzata, Halina Koczyk et Aleksandra Błotnicka-Smyk. « Assessment of thermo-modernization in a multifamily building ». E3S Web of Conferences 49 (2018) : 00004. http://dx.doi.org/10.1051/e3sconf/20184900004.

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This paper presents an evaluation of thermo-modernisation improvements applied over the years in the multi-family residential building. Those improvements have included the civil and mechanical activities. The civil activities were as follows: the application of the thermal insulation on the external walls and replacement of the windows. The mechanical activities were mainly focused on an adjustment of the heating system to the new reduced heating demands of the building. The heating system in the building was modified - the radiators were replaced with the new ones, the heating central unit was modernised. Moreover the local gas water heaters were eliminated. Then the building’s energy performance characteristics, prepared according to the valid Polish methodology, were compared with the real consumption. It was found that after the application of thermo-modifications the heating demand was reduced, twice. The economy efficiency of the thermo-modernisation was evaluated by means of a method of the annual costs. The annual costs include the heating system exploitation costs, DHW preparation system and the auxiliary devices electricity costs.

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Li, Jun, et Martin Ostoja-Starzewski. « Thermo-poromechanics of fractal media ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 378, n^o 2172 (11 mai 2020) : 20190288. http://dx.doi.org/10.1098/rsta.2019.0288.

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This article advances continuum-type mechanics of porous media having a generally anisotropic, product-like fractal geometry. Relying on a fractal derivative, the approach leads to global balance laws in terms of fractal integrals based on product measures and, then, converting them to integer-order integrals in conventional (Euclidean) space. Proposed is a new line transformation coefficient that is frame invariant, has no bias with respect to the coordinate origin and captures the differences between two fractal media having the same fractal dimension but different density distributions. A continuum localization procedure then allows the development of local balance laws of fractal media: conservation of mass, microinertia, linear momentum, angular momentum and energy, as well as the second law of thermodynamics. The product measure formulation, together with the angular momentum balance, directly leads to a generally asymmetric Cauchy stress and, hence, to a micropolar (rather than classical) mechanics of fractal media. The resulting micropolar model allowing for conservative and/or dissipative effects is applied to diffusion in fractal thermoelastic media. First, a mechanical formulation of Fick’s Law in fractal media is given. Then, a complete system of equations governing displacement, microrotation, temperature and concentration fields is developed. As a special case, an isothermal model is worked out. This article is part of the theme issue ‘Advanced materials modelling via fractional calculus: challenges and perspectives’.

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Hu, Zheng, Ming Han, Zhen Chuan Song et Ke Yan Ning. « Numerical Investigation on Thermo Mechanical Behavior in Wet Multidisc Friction Pairs System ». Applied Mechanics and Materials 697 (novembre 2014) : 177–80. http://dx.doi.org/10.4028/www.scientific.net/amm.697.177.

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In order to research the thermomechanical behavior of multidisc friction pairs system, three dimensional model is established for numerical simulation under simulated braking process. Based on some accurate boundary conditions, the temperature fields and thermal stress fields of friction discs and separator discs are simulated using finite element method. The temperature fields and contact stress fields of friction disc and separator discs are obtained, and their regularities of distribution are studied spatially and historically. To verify the simulation results, an experimental investigation is carried out. The results offered references for analyzing failure forms and causes of the wet multidisc friction pairs system.

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Aoyama, Aaron, James Blanchard, John Sethian, Nasr Ghoniem et Shahram Sharafat. « Thermo-Mechanical Analysis of the Hibachi Foil for the Electra Laser System ». Fusion Science and Technology 56, n^o 1 (juillet 2009) : 435–40. http://dx.doi.org/10.13182/fst09-a8940.

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Bonifácio, Aldemon Lage, Rafaela De Oliveira Amaral, Michèle Cristina Resende Farage, Ciro De Barros Barbosa et Flávio De Souza Barbosa. « Thermo-hydro-mechanical model parameters adjustment via a distributed scientific workflow system ». DYNA 84, n^o 200 (1 janvier 2017) : 46–52. http://dx.doi.org/10.15446/dyna.v84n200.56156.

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Este trabajo presenta una estrategia numérica para el ajuste automático de parámetros del Modelo de Daño de Mazars, aplicado a un modelado termohidro- mecánico de estructuras de concreto. El procedimiento se basa en un sistema de flujo de trabajo científico (SWS) que aborda el universo combinatorio de parámetros ajustables al minimizar el número de simulaciones requeridas para obtener resultados optimizados. SWS no sólo mejora la eficiencia, sino que también facilita la estrategia en comparación con los procedimientos manuales. El algoritmo adoptado se desarrolla en un lenguaje de escritura intuitivo y emplea un ambiente computacional distribuido. La comparación con los datos experimentales indica que la metodología propuesta fue eficiente y efectiva para mejorar el análisis, minimizando los errores y ahorrando tiempo de procesamiento.

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Bruno, Nickolaus M., Ibrahim Karaman, Joseph H. Ross et Yuriy I. Chumlyakov. « High-field magneto-thermo-mechanical testing system for characterizing multiferroic bulk alloys ». Review of Scientific Instruments 86, n^o 11 (novembre 2015) : 113902. http://dx.doi.org/10.1063/1.4934571.

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Kromer, R., F. Mauget, L. Despres, S. Costil et J. Cormier. « Thermo-mechanical fatigue evaluation of a thermal barrier coating bond-coatless system ». Materials Science and Engineering : A 756 (mai 2019) : 130–41. http://dx.doi.org/10.1016/j.msea.2019.04.020.

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Ullah, Muhammad Wajid, Mazhar Ul-Islam, Shaukat Khan, Yeji Kim, Jae Hyun Jang et Joong Kon Park. « In situ synthesis of a bio-cellulose/titanium dioxide nanocomposite by using a cell-free system ». RSC Advances 6, n^o 27 (2016) : 22424–35. http://dx.doi.org/10.1039/c5ra26704h.

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Kim, Hye Rim, Jae Hong Lee et Tong Seop Kim. « Optimal thermo-economic design of a PAFC-ORC combined power system ». Journal of Mechanical Science and Technology 34, n^o 9 (septembre 2020) : 3863–74. http://dx.doi.org/10.1007/s12206-020-0837-5.

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Genchev, Gancho, Ossama Dreibati, Ralf Ossenbrink, Nikolay Doynov et Vesselin Michailov. « Physical and Numerical Simulation of the Heat-Affected Zone of Multi-Pass Welds ». Materials Science Forum 762 (juillet 2013) : 544–50. http://dx.doi.org/10.4028/www.scientific.net/msf.762.544.

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The paper presents a numerical and experimental approach for the quantification of the thermo-mechanical properties in multi-pass welds heat affected zone (HAZ) of low alloy steel S355J2+N. First, the characteristic temperature cycles for multi-pass welds were identified by FE temperature field simulations of welding. Based on the identified temperature cycles, the microstructure in the HAZ has been physically simulated with the simulation and testing system Gleeble 3500 to investigate the influence of multi thermal exposure on the thermo-mechanical properties. Thus, the thermo-mechanical material properties including thermal strain and temperature dependent stress strain behaviour as function of peak temperatures and cooling rates have been determined. These material properties were used to calibrate a developed model for numerical prediction of the material properties of multi-pass weld HAZ.

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Selvadurai, A. P. S., A. P. Suvorov et P. A. Selvadurai. « Thermo-hydro-mechanical processes in fractured rock formations during glacial advance ». Geoscientific Model Development Discussions 7, n^o 6 (5 novembre 2014) : 7351–94. http://dx.doi.org/10.5194/gmdd-7-7351-2014.

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Abstract. The paper examines the coupled thermo-hydro-mechanical (THM) processes that develop in a fractured rock region within a fluid-saturated rock mass due to loads imposed by an advancing glacier. This scenario needs to be examined in order to assess the suitability of potential sites for the location of deep geologic repositories for the storage of high-level nuclear waste. The THM processes are examined using a computational multiphysics approach that takes into account thermo-poroelasticity of the intact geological formation and the presence of a system of sessile but hydraulically interacting fractures (fracture zones). The modeling considers coupled thermo-hydro-mechanical effects in both the intact rock and the fracture zones due to contact normal stresses and fluid pressure at the base of the advancing glacier. Computational modelling provides an assessment of the role of fractures that can modify the pore pressure generation within the entire rock mass.

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Sarevski, Milan, Vasko Sarevski, Voislav Ristovski et Nikola Stavrev. « Energetic and exploitation characteristics of a two-phase ejecting vacuum system built in the paper machine at A.D. Komuna Skopje ». Chemical Industry 58, n^o 5 (2004) : 237–39. http://dx.doi.org/10.2298/hemind0405237s.

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This work presents the concept of a two-phase ejecting vacuum system. The energetic characteristics of these systems were analyzed and compared to those with mechanical pumps with water ring and turbo compressor vacuum pumps. A method for optimizing a two-phase thermo compressor vacuum systems is presented. The analysis included the exploitation characteristics of the system developed at A.D. "Komuna" Skopje.

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de Lemos, Marcelo J. S. « A Thermo-Mechanical Model for a Counterflow Biomass Gasifier ». Defect and Diffusion Forum 354 (juin 2014) : 227–35. http://dx.doi.org/10.4028/www.scientific.net/ddf.354.227.

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This article presents a thermo-mechanical approach to investigate heat transfer between solid and fluid phases in a model gasifier. A two-temperature equation approach is applied in addition to a macroscopic model for laminar flow through a porous moving bed. Transport equations are discretized using the control-volume method and the system of algebraic equations is relaxed via the SIMPLE algorithm. The effects on inter-phase heat transfer due to variation of medium permeability, thermal conductivity and thermal capacity are analyzed. Results indicate that for smaller medium permeabilities, as well as for higher solid-to-fluid thermal capacity and thermal conductivity ratios, enhancement of heat transfer between phases is observed.

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Malendowski, Michal, Adam Glema, Zdzislaw Kurzawa et Lukasz Polus. « Mechanical Response under Natural Fire of Barrel Shape Shell Structure ». Journal of Structural Fire Engineering 6, n^o 1 (17 février 2015) : 59–66. http://dx.doi.org/10.1260/2040-2317.6.1.59.

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In this paper, thermo-mechanical analysis of the structural shell construction exposed to natural fire is presented. A barrel shape coverlet with dimensions of 40m x 80m is a roof system covers the shopping arcade. The braced shell structure is made of steel rectangular hollow sections. The steel construction is a support for a special glass system. Behaviour of structure under natural fire conditions is considered as the main goal of research. Fire is simulated with the use of FDS software. Then, adiabatic surface temperatures are transferred into the non-linear Abaqus finite element analysis as boundary conditions for thermo-mechanical analysis. The 3D geometry FE computational model is prepared using 3D beam finite elements with mechanical and thermal degrees of freedom. CFD and FE analyses are sequentially coupled using special individually designed scripts. The analyses show influence of natural fire on the structural behaviour of the roof.

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Selvadurai, A. P. S., A. P. Suvorov et P. A. Selvadurai. « Thermo-hydro-mechanical processes in fractured rock formations during a glacial advance ». Geoscientific Model Development 8, n^o 7 (20 juillet 2015) : 2167–85. http://dx.doi.org/10.5194/gmd-8-2167-2015.

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Abstract. The paper examines the coupled thermo-hydro-mechanical (THM) processes that develop in a fractured rock region within a fluid-saturated rock mass due to loads imposed by an advancing glacier. This scenario needs to be examined in order to assess the suitability of potential sites for the location of deep geologic repositories for the storage of high-level nuclear waste. The THM processes are examined using a computational multiphysics approach that takes into account thermo-poroelasticity of the intact geological formation and the presence of a system of sessile but hydraulically interacting fractures (fracture zones). The modelling considers coupled thermo-hydro-mechanical effects in both the intact rock and the fracture zones due to contact normal stresses and fluid pressure at the base of the advancing glacier. Computational modelling provides an assessment of the role of fractures in modifying the pore pressure generation within the entire rock mass.

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Laloui, Lyesse, Matteo Moreni et Laurent Vulliet. « Comportement d'un pieu bi-fonction, fondation et échangeur de chaleur ». Canadian Geotechnical Journal 40, n^o 2 (1 avril 2003) : 388–402. http://dx.doi.org/10.1139/t02-117.

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The behaviour of a pile subjected to thermo-mechanical loads was studied in situ with the aim of quantifying the thermal influence on the bearing capacity of heat exchanger piles. To accomplish this, a pile situated in a building under construction was equipped with a pipe system to inject heat into it using a special heat pump. Load cells, deformation gauges, and thermometers were installed to evaluate the behaviour of the pile during seven tests with coupled thermo-mechanical loads. The temperature variations applied to the pile were of the order of 15°C and the mechanical load reached 1300 kN. The results permitted the quantification of three significant effects brought about by the temperature increase: (i) pile uplift, (ii) mobilization of skin friction due to the relative displacement of the pile with respect to the ground, (iii) additional load generated in the pile by constrained dilation.Key words: heat exchanger pile, in situ test, loading test, thermo-mechanical loads, mobilization of skin friction.

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Destefanis, Maurizio, Corentin Ravoux, Alessandro Cossard et Alessandro Erba. « Thermo-Elasticity of Materials from Quasi-Harmonic Calculations ». Minerals 9, n^o 1 (26 décembre 2018) : 16. http://dx.doi.org/10.3390/min9010016.

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An effective algorithm for the quasi-harmonic calculation of thermo-elastic stiffness constants of materials is discussed and implemented into the Crystal program for quantum-mechanical simulations of extended systems. Two different approaches of increasing complexity and accuracy are presented. The first one is a quasi-static approximation where the thermal dependence of elastic constants is assumed to be due only to the thermal expansion of the system. The second one is fully quasi-harmonic, takes into account thermal expansion, and explicitly computes Helmholtz free energy derivatives with respect to strain. The conversion of isothermal into adiabatic thermo-elastic constants is also addressed. The algorithm is formally presented and applied to the description of the thermo-elastic response of the forsterite mineral.

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Wang, Qian Qian, Ming Kong, Yi An, Ya Liu, Jing Jing Li, Xuan Zhou, Chao Feng et al. « Hydroxybutyl chitosan thermo-sensitive hydrogel : a potential drug delivery system ». Journal of Materials Science 48, n^o 16 (12 avril 2013) : 5614–23. http://dx.doi.org/10.1007/s10853-013-7356-z.

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Mahmoodpour, Saeed, Mrityunjay Singh, Ramin Mahyapour, Sri Kalyan Tangirala, Kristian Bär et Ingo Sass. « Numerical Simulation of Thermo-Hydro-Mechanical Processes at Soultz-sous-Forêts ». Energies 15, n^o 24 (7 décembre 2022) : 9285. http://dx.doi.org/10.3390/en15249285.

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Porosity and permeability alteration due to the thermo-poro-elastic stress field disturbance from the cold fluid injection is a deciding factor for longer, more economic, and safer heat extraction from an enhanced geothermal system (EGS). In the Soultz-sous-Forêts geothermal system, faulted zones are the main flow paths, and the resulting porosity–permeability development over time due to stress reorientation is more sensitive in comparison with the regions without faulted zones. Available operational and field data are combined through a validated numerical simulation model to examine the mechanical impact on the pressure and temperature evolution. Results shows that near the injection wellbore zones, permeability and porosity values are strongly affected by stress field changes, and that permeability changes will affect the overall temperature and pressure of the system, demonstrating a fully coupled phenomenon. In some regions inside the faulted zones and close to injection wellbores, porosity doubles, whereas permeability may be enhanced up to 30 times. A sensitivity analysis is performed using two parameters which are not well discussed in the literature the for mechanical aspect, but the results in this study show that one of them impacts significantly on the porosity–permeability changes. Further experimental and field works on this parameter will help to model the heat extraction more precisely than before.

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