Relevant bibliographies by topics / Thermo-stressed state

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Thermo-stressed state'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Thermo-stressed state"

1

Goloshumova, V., and Yu Brodov. "The thermo-stressed state of Steam Turbine Rotors during plant start-up." International Journal of Energy Production and Management 1, no. 3 (June 20, 2016): 245–52. http://dx.doi.org/10.2495/eq-v1-n3-245-252.

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Pulyaev, I. S., and S. M. Pulyaev. "ACCOUNTING OF THE OWN THERMO-STRESSED STATE OF THE SOLID CONCRETE WHILE PROVIDING THE REQUIRED CONSUMER PROPERTIES OF THE CRIMEAN BRIDGE CONSTRUCTIONS." Russian Automobile and Highway Industry Journal 15, no. 5 (November 11, 2018): 742–59. http://dx.doi.org/10.26518/2071-7296-2018-5-742-759.

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Introduction.The paper deals with the issues related to the determination and registration of the own thermo-stressed state formed in concrete while hardening and used to provide the required consumer properties in the Crimean bridge construction. Therefore, the problem is relevant because of the deadlines for the construction of such facility in the conditions of rough terrain and dry hot climate, and also taking into account the development of the unique non-class facilities in Russia.Materials and methods.The research is carried out in real-time conditions with the usage of modern measuring systems in practice, allowing to control the process of temperature and strength of hardening concrete in time. The modern computational and analytical complex, which is repeatedly tested under real conditions and by thermophysical calculations of hardening concrete of various class objects and massiveness, is used.Results.The results of the intrinsic thermo-stressed state of hardening concrete are presented in determining the permissible temperature gradient, which make it possible to accelerate the process of erecting the object with observance of the necessary consumer properties.Discussion and conclusion.The main conclusions and suggestions are made taking into account the intrinsic thermally stressed state of the concrete when it was hardened during the construction of the Crimean bridge. The paper would be interesting and useful for engineers and technical workers engaged in real production conditions, and for specialists dealing with the issues of the thermophysical processes occurring in concrete hardening and with the problems of ensuring the high consumer concrete properties in structures.
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Efimova, A. R., S. A. Vasilenko, and V. V. Bychkova. "CCP maneuverability increasing algorithm realized on DCS with the metal allowable thermo-stressed state provision." Journal of Physics: Conference Series 1679 (November 2020): 052010. http://dx.doi.org/10.1088/1742-6596/1679/5/052010.

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Zhang, Xiaolong, and Zheng Zhong. "Thermo-Chemo-Elasticity Considering Solid State Reaction and the Displacement Potential Approach to Quasi-Static Chemo-Mechanical Problems." International Journal of Applied Mechanics 10, no. 10 (December 2018): 1850112. http://dx.doi.org/10.1142/s1758825118501120.

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Engineering materials and structures represent complex behaviors when reacting to superposed influences of mechanical forces, high temperature, diffusion and reaction of chemicals, which could cause large internal stresses and further induce cracks or failure. To determine the material reliability and integrity, the multi-field interactions and stresses/strains evolutions need to be identified at first. We proposed a theory of thermo-chemo-elasticity considering solid state reactions between the solid phase and absorbed chemicals in a stressed-solid. Both diffusion–reaction induced chemical strains and thermal dilations are taken into account as functions of species concentration, reaction extent and temperature. The fully coupled conservation laws, constitutive equations and chemical kinetics are formulated for the initial-boundary problem. For isotropic solids, we developed a displacement potential approach for steady-state 3D problems of thermo-chemo-elasticity. Solutions can be found from particular solutions of displacement potential and homogeneous solution of thermo-chemo Lamé equation. This approach is also available for transient chemo-mechanical problems in thermal equilibrium providing that quasi-static conditions are introduced. We exemplified the model with a reaction-dominated problem of a core–shell structure subjected to chemo-mechanical loading and the results demonstrate the capability of the model in dealing with comprehensive influences of solid state reaction and species diffusion on solids.
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Weng, Lu Qian, Hai Lin Cao, Pavel V. Krivenko, Yue Guo, O. N. Petropavlovsky, V. I. Pushkar, and A. Yu Kovalchuk. "Modeling a Thermo-Stressed State of the Cast-in-Situ Low Carbon Footprint Alkali Activated Slag Cement Concrete Hardened under Hot Environment." Applied Mechanics and Materials 525 (February 2014): 482–90. http://dx.doi.org/10.4028/www.scientific.net/amm.525.482.

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Alkali activated slag cement concretes are low carbon footprint building mateirals, which can meet the requirements for sustainable development. The paper covers the results of modeling a thermo-stressed state of the cast-in-situ massive alkali activated slag cement concrete structure hardened under hot environment to meet the requirements for marine engineering application. The results show that alkali activated slag cement concretes have a substantially lower heat release than that of Portland, are suitable for cast-in-situ massive alkali activated slag cement concrete structure even under hot environment.
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Volkov, Ivan, Leonid Igumnov, Svetlana Litvinchuk, and Igor Vorobtsov. "Modeling dynamic deformation and failure of thin-walled structures under explosive loading." EPJ Web of Conferences 183 (2018): 03016. http://dx.doi.org/10.1051/epjconf/201818303016.

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In the framework of mechanics of damaged media, behavior of thin-walled structures under pulsed loading is described. Account is taken of the interaction of the processes of dynamic deformation and damage accumulation, as well as of the main characteristic features of the dynamic failure process: the multi-staged character, nonlinear summation of damage, stressed state history and accumulated damage level. The chosen system of equations of thermo-plasticity describes the main effects of dynamic deformation of the material for random deformation trajectories. The equations of state are based on the notions of yield surface and the principle of gradientality of the plastic strain rate vector. Evolutionary equations of damage accumulation are written for a scalar parameter of damage level and are based on energy principles. The effect of the stressed state type and the accumulated damage level on the processes of nucleation, growth and merging of microdefects is accounted for. Results of numerically modelling processes of dynamic deformation and failure of spherical and closed cylindrical shells with plane and hemispherical bottoms under single pulsed explosive loading are presented. The computational results are compared with experimental data.
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Gaidaichuk, Viktor, Liudmyla Shevchuk, and Olena Bilobrytska. "Influence of incompatibility of thermomechanical parameters of bearing layers of a bridge structure on its thermo-stressed state." Strength of Materials and Theory of Structures, no. 107 (October 29, 2021): 301–11. http://dx.doi.org/10.32347/2410-2547.2021.107.301-311.

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On the basis of the theory of thermoelasticity, the problem of the thermally stressed state of a two-layer fragment of a bridge structure, consisting of a metal base and an asphalt-concrete upper layer, under conditions of a change in the ambient temperature at different values of the coefficients of thermal linear expansion of the layers is considered. Using the finite element method, the fields of thermal stresses, deformations and displacements are constructed for various values of the thermomechanical characteristics of the layers. The analysis of the influence of the values of thermomechanical parameters on the stress-strain state of the system is carried out. It is shown that with an increase in the incompatibility of these characteristics, the intensities of stresses and strains increase. The zones of concentration of these functions are found. It is recommended to use materials with close values of their thermomechanical parameters when designing bridges to avoid their premature destruction.
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Semenov, Kirill, and Yuri Barabanshchikov. "Thermal Cracking Resistance in Massive Concrete Structures in the Winter Building Period." Applied Mechanics and Materials 725-726 (January 2015): 431–41. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.431.

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The article deals with issues of the thermal cracking resistance in massive concrete and reinforced concrete structures during the building period. The paper lists the calculation results of the NPP reactor foundation mat thermal stressed state and thermal cracking resistance. The research also considers the concrete hardening temperature influence on its thermo-physical and deformation characteristics. The deformation criterion is used to calculate the concrete thermal cracking resistance. In addition, the paper focuses on the assignment of safe concrete pouring technological parameters in the winter period. Furthermore, the article estimates the necessity of the structure peripheral electric heating during the building period.
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9

Serednytska, Kh I., and R. M. Martynyak. "Thermoelastic behavior of a bimaterial with interface crack filled with an incompressible fluid." Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, no. 1 (2019): 206–9. http://dx.doi.org/10.17721/1812-5409.2019/1.48.

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Thermo-stressed state of the bimaterial with the interfacial crack filled with an incompressible fluid is investigated. The bimaterial with zero Dundurs parameter is considered. The thermo-elastic problem is reduced to nonlinear systems of singular integro-differential equations for a temperature jump between the cracks faces and an opening crack. The pressure of the fluid is determined from the equation of the incompressible fluid. Using the method of successive approximations a numerical solution of the problem is constructed. The opening crack and temperature jump are determined by the finite sum for Chebyshev polynomials of the second kind. The coefficients for Chebyshev polynomials are determined from the system of linear algebraic equations. Having made numerical calculations, the dependences of the pressure of the fluid and the opening crack from the mechanical loads and density and direction of the heat flow have been constructed. The influence of fluid pressure on the stress intensity factor mode I are analyzed.
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Vorobiev, Yu, R. Rzadkowski, N. Ovcharova, and T. Berlizova. "Thermo-stressed state of a single-crystal cooled blade taking into account the axial orientation of the crystallographic axes." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines 1, no. 33 (January 1, 2018): 18–22. http://dx.doi.org/10.20998/2078-9130.2018.33.151222.

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Dissertations / Theses on the topic "Thermo-stressed state"

1

Мордвінцева, Ірина Олександрівна. "Моделювання в САПР нестаціонарних термічних навантажень та ресурсної міцності поршнів швидкохідних дизелів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40132.

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Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.03 – двигуни та енергетичні установки. – Національний технічний університет "Харківський політехнічний інститут". –Харків, 2018. Дисертація присвячена моделюванню в САПР нестаціонарних термічних навантажень та ресурсної міцності поршнів швидкохідних дизелів. З'ясовано, що для моделювання температурного стану поршня в перехідних процесах дизеля необхідно застосування нестаціонарних моделей експлуатації. При цьому, при завданні граничних умов необхідно мати дані щодо функцій керування, які враховують час перехідного процесу. Визначено допустимі спрощення завдання ГУ в характерних зонах поршня при розрахунках температурного та термонапруженого стану поршня на стаціонарних та в перехідних процесах дизеля. Їх використання дозволяє скоротити час проектування без порушення концепції гарантованого забезпечення ресурсу кромки КЗ на початкових етапах застосування САПР. Проведено експериментальне дослідження з визначення температурного стану поршня для дизеля 4ЧН12/14 в перехідних процесах дизеля. За даними дослідження визначені функції керування для кожного перехідного процесу. Запропоновано комплекс математичних моделей для визначення температурного та термонапруженого стану поршня в перехідних процесах дизеля. Для цього визначені рівняння функцій керування ГУ для ділянок першого та другого ПК. При спрощені ГУ достовірність результатів запропоновано встановлювати за показником відносного розрахункового збільшення ресурсу. За результатами досліджень встановлено вплив запізнення в часі ступінчастої зміни ГУ 3-го роду поршня в перехідному процесі дизеля на ресурсну міцність кромки КЗ. Означений захід дає змогу підвищити ефективність САПР на стаціонарних та нестаціонарних навантаженнях та при виконанні оцінки ресурсної міцності поршнів. Запропоновані нові конструкції поршнів з порожнинами масляного охолодження.
Thesis for the science degree of the Candidate of technical sciences by specialіty 05.05.03 – engines and power plants. – National Technical University "Kharkov polytechnic institute", Kharkov, 2018. The thesis is devoted to modeling in CAD of non-stationary thermal stresses and resource durability of pistons of high-speed diesel engines. The dissertation is devoted to the modeling of non-stationary thermal loads and resource strength of high-speed diesels in CAD. It has been found that for modeling the thermal state of the piston in the transient processes diesel, it is necessary to use non-stationary models of operation. In this case, when the boundary conditions are imposed, it is necessary to have data on control functions that including the time of the transition process. The allowable simplifications of the border conditions problem in the characteristic zones of the piston in the calculations of the thermal and thermo-stressed state of the piston on the stationary and in the transient processes of the diesel load are determined. Their use allows to shorten the design time without violating the concept of guaranteed maintenance of the resource of the edge of the combustion chamber in the initial stages of CAD application. An experimental study was conducted to determine the thermal of a piston for a 4CHN12/14 diesel engine in transient diesel processes. According to the study, control functions are defined for each transient process. A complex of mathematical models for the determination of the thermal and thermo-stressed state of the piston in the transient processes of the diesel is proposed. With simplified border conditions, the reliability of the results proposed to set the indicator of the relative estimated increase in the resource. According to the results of the research, the effect of the shift in time of the step change of the BC of the 3rd kind of a piston in the transient process of the diesel engine on the resource strength of the edge of the combustion chamber is established. This measure allows to increase the efficiency of CAD on stationary and non-stationary loads and when performing the evaluation of the resource strength of the pistons. New designs of pistons with oil-cooling cavities are proposed.
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2

Мордвінцева, Ірина Олександрівна. "Моделювання в САПР нестаціонарних термічних навантажень та ресурсної міцності поршнів швидкохідних дизелів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40129.

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Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.03 – двигуни та енергетичні установки. – Національний технічний університет "Харківський політехнічний інститут". –Харків, 2018. Дисертація присвячена моделюванню в САПР нестаціонарних термічних навантажень та ресурсної міцності поршнів швидкохідних дизелів. З'ясовано, що для моделювання температурного стану поршня в перехідних процесах дизеля необхідно застосування нестаціонарних моделей експлуатації. При цьому, при завданні граничних умов необхідно мати дані щодо функцій керування, які враховують час перехідного процесу. Визначено допустимі спрощення завдання ГУ в характерних зонах поршня при розрахунках температурного та термонапруженого стану поршня на стаціонарних та в перехідних процесах дизеля. Їх використання дозволяє скоротити час проектування без порушення концепції гарантованого забезпечення ресурсу кромки КЗ на початкових етапах застосування САПР. Проведено експериментальне дослідження з визначення температурного стану поршня для дизеля 4ЧН12/14 в перехідних процесах дизеля. За даними дослідження визначені функції керування для кожного перехідного процесу. Запропоновано комплекс математичних моделей для визначення температурного та термонапруженого стану поршня в перехідних процесах дизеля. Для цього визначені рівняння функцій керування ГУ для ділянок першого та другого ПК. При спрощені ГУ достовірність результатів запропоновано встановлювати за показником відносного розрахункового збільшення ресурсу. За результатами досліджень встановлено вплив запізнення в часі ступінчастої зміни ГУ 3-го роду поршня в перехідному процесі дизеля на ресурсну міцність кромки КЗ. Означений захід дає змогу підвищити ефективність САПР на стаціонарних та нестаціонарних навантаженнях та при виконанні оцінки ресурсної міцності поршнів. Запропоновані нові конструкції поршнів з порожнинами масляного охолодження.
Thesis for the science degree of the Candidate of technical sciences by specialіty 05.05.03 – engines and power plants. – National Technical University "Kharkov polytechnic institute", Kharkov, 2018. The thesis is devoted to modeling in CAD of non-stationary thermal stresses and resource durability of pistons of high-speed diesel engines. The dissertation is devoted to the modeling of non-stationary thermal loads and resource strength of high-speed diesels in CAD. It has been found that for modeling the thermal state of the piston in the transient processes diesel, it is necessary to use non-stationary models of operation. In this case, when the boundary conditions are imposed, it is necessary to have data on control functions that including the time of the transition process. The allowable simplifications of the border conditions problem in the characteristic zones of the piston in the calculations of the thermal and thermo-stressed state of the piston on the stationary and in the transient processes of the diesel load are determined. Their use allows to shorten the design time without violating the concept of guaranteed maintenance of the resource of the edge of the combustion chamber in the initial stages of CAD application. An experimental study was conducted to determine the thermal of a piston for a 4CHN12/14 diesel engine in transient diesel processes. According to the study, control functions are defined for each transient process. A complex of mathematical models for the determination of the thermal and thermo-stressed state of the piston in the transient processes of the diesel is proposed. With simplified border conditions, the reliability of the results proposed to set the indicator of the relative estimated increase in the resource. According to the results of the research, the effect of the shift in time of the step change of the BC of the 3rd kind of a piston in the transient process of the diesel engine on the resource strength of the edge of the combustion chamber is established. This measure allows to increase the efficiency of CAD on stationary and non-stationary loads and when performing the evaluation of the resource strength of the pistons. New designs of pistons with oil-cooling cavities are proposed.
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Book chapters on the topic "Thermo-stressed state"

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Popovych, Vasyl. "Methods for Determination of the Thermo-stressed State of Thermosensitive Solids Under Complex Heat Exchange Conditions." In Encyclopedia of Thermal Stresses, 2997–3008. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_617.

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Conference papers on the topic "Thermo-stressed state"

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Pankratova, Nataliya D. "Thermo-Stressed State of Anisotropic Non-Homogeneous Constructive Elements." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0535.

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Abstract On the basis of the developed approach to solution of problems of the thermo-stressed state of hollow thick-walled bodies with taking into account arbitrary variability of material properties through their thickness, different modes of layers conjugations, types of boundary conditions on all limited surfaces and forms of loading according to elasticity theory the influence of non-homogeneity and anisotropy of elastic properties of materials at the stress level an deformabiity of laminated bodies in the form of a cylinder, cone, sphere or plate is studied.
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Schranz, Bernhard, Christoph Czaderski, Moslem Shahverdi, Julien Michels, Thomas Vogel, and Masoud Motavalli. "Ribbed iron-based shape memory alloy bars for pre-stressed strengthening applications." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.1394.

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<p>Iron-based shape memory alloys (Fe-SMA) are a cost-effective alternative to conventional strengthening materials. With their unique properties such as the shape-memory effect (SME), structures can be retrofitted regarding the serviceability state as well as ultimate load capacity. The term SME refers to the ability of the material to return to its original shape upon heating, after having been deformed at ambient temperature. The heating and cooling process are generally referred to as “activation” of the alloy. If the material is restrained at activation, the material is subjected to tensile stresses. This phenomenon can be used for structural pre-stressing. The Fe- SMA material can be produced in form of standard-geometry reinforcement bars, to be used for flexural as well as shear-strengthening of concrete members. As a base for novel strengthening methods, this study aims at investigating the thermo-mechanical behaviour of Fe-SMA bars under realistic conditions. It comprises loading the material after activation (pre-stressed), exposure to multi-cyclic loading and observation of relaxation behaviour of pre-stressed Fe-SMA bars. Experiments were performed with diameter 16 and 12 mm bars. The results show a highly non- linear stress-strain behaviour, unlike conventional pre-stressing materials. The experiments with activated samples show that the stress-strain curve of Fe-SMA bars loaded after activation will approach and then follow the curve of non-activated tensile tests approximately in the point of the initial deformation. Furthermore, analytical material models are developed which show good correspondence with experimental data and serve as a base for further studies and structural design.</p>
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