Journal articles: 'Thermomechanical processes'

1

Ronda, J., O. Mahrenholtz, and R. Hamann. "Thermomechanical simulation of underwater welding processes." Archive of Applied Mechanics 62, no. 1 (1992): 15–27. http://dx.doi.org/10.1007/bf00786678.

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Kolesnik, R. V., M. V. Yurzhenko, N. G. Korab, A. A. Shadrin, and Yu V. Litvinenko. "Modeling thermomechanical processes in welding high-tech plastics with embedded element." Paton Welding Journal 2017, no. 10 (October 28, 2017): 24–30. http://dx.doi.org/10.15407/tpwj2017.10.04.

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Kitaeva, D. A., G. E. Kodzhaspirov, and Y. I. Rudaev. "ON SELF-ORGANIZATION UNDER THERMOMECHANICAL DEFORMATION PROCESSES." Tambov University Reports. Series: Natural and Technical Sciences 21, no. 3 (2016): 1051–54. http://dx.doi.org/10.20310/1810-0198-2016-21-3-1051-1054.

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Khlestov, V. M., E. V. Konopleva, and H. J. Mcqueen. "Kinetics of Austenite Transformation During Thermomechanical Processes." Canadian Metallurgical Quarterly 37, no. 2 (April 1998): 75–89. http://dx.doi.org/10.1179/cmq.1998.37.2.75.

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Shardakov, I. N., V. P. Matveyenko, N. V. Pistsov, and V. P. Beghishev. "Simulation of thermomechanical processes in crystallizing polymer." Polymer Engineering & Science 37, no. 8 (August 1997): 1270–79. http://dx.doi.org/10.1002/pen.11772.

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6

Charalambakis, Nicolas. "Behavior and asymptotic stability of thermomechanical processes." International Journal of Engineering Science 24, no. 5 (January 1986): 755–64. http://dx.doi.org/10.1016/0020-7225(86)90108-4.

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Hrevtsev, O., N. Selivanova, P. Popovych, L. Poberezhny, V. Sakhno, O. Shevchuk, L. Poberezhna, I. Murovanyi, A. Hrytsanchuk, and O. Romanyshyn. "Simulation of thermomechanical processes in disc brakes of wheeled vehicles." Journal of Achievements in Materials and Manufacturing Engineering 1, no. 104 (January 1, 2021): 11–20. http://dx.doi.org/10.5604/01.3001.0014.8482.

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Purpose: Ensuring the required operational reliability of disc brakes by forecasting their technical condition taking into account thermomechanical processes. Design/methodology/approach: Differential equations of rotation of a rigid body around a fixed axis are solved, it is established that the equations of motion and the equations of thermal conductivity are indirectly related. The use of these analytical dependences provides a better understanding of thermomechanical transients. Findings: The solution is obtained on the basis of the differential equation of thermal conductivity of the hyperbolic type, which does not allow an infinite velocity of propagation of temperature perturbations in contrast to the differential equation of thermal conductivity of the parabolic Fourier type. The obtained analytical dependences provide a better understanding of thermomechanical transients and develop a theoretical basis for determining stresses and heat fluxes in solving problems of reliability and durability of disc brakes. Research limitations/implications: The work uses generally accepted assumptions and limitations for thermomechanical calculations. Practical implications: It is shown, that transients in a mechanical system - a brake disk at impulse loadings cause emergence of thermal effects which arise under the influence of external loadings. Originality/value: The application of these analytical dependences provides a better understanding of thermomechanical transients and develops a theoretical basis for solving problems of reliability and durability of disc brakes.

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Cruchaga, Marcela A., Diego J. Celentano, and Roland W. Lewis. "Modeling fluid‐solid thermomechanical interactions in casting processes." International Journal of Numerical Methods for Heat & Fluid Flow 14, no. 2 (March 2004): 167–86. http://dx.doi.org/10.1108/09615530410513791.

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Fedotkin, I. M., and A. G. Novitskii. "Thermomechanical Processes in the Production of Mineral Fibers." Refractories and Industrial Ceramics 45, no. 4 (July 2004): 242–45. http://dx.doi.org/10.1023/b:refr.0000046505.69457.c8.

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Kulbekov, M. K., and Sh I. Khamraev. "Thermomechanical processes in firing clays of polymineral composition." Glass and Ceramics 53, no. 9 (September 1996): 272–74. http://dx.doi.org/10.1007/bf01165841.

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Zarubin, V. S., and G. N. Kuvyrkin. "Mathematical modeling of thermomechanical processes in aircraft structures." Journal of Engineering Physics and Thermophysics 73, no. 1 (January 2000): 138–44. http://dx.doi.org/10.1007/bf02681688.

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Shveikin, V. P. "Thermomechanical Hardening of Steels." Solid State Phenomena 284 (October 2018): 507–12. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.507.

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The methods of the hot working of metals by pressure are discussed. The features of the hot plastic deformation of the metal which determine the formation of the structure and properties of steel are noted. The definition of thermomechanical treatment is given. The definitions of a variety of thermomechanical and high-temperature thermomechanical processes are given. The features of the thermomechanical treatment of steels toughened to martensite are discussed. The temperature, deformation-velocity and time parameters of high-temperature thermomechanical processing are given. Their influence on the structure and properties of steels is analyzed

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Hasanpor Divshali, Poria, Pasi Laakso, Seppo Hänninen, Robert John Millar, and Matti Lehtonen. "Electrical and Thermomechanical Co-Simulation Platform for NPP." Energies 14, no. 4 (February 10, 2021): 939. http://dx.doi.org/10.3390/en14040939.

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In order to analyze the safety of nuclear power plants (NPP), interactions between thermomechanical and automation processes, the on-site electrical grid, and the off-site transmission system should be studied in detail. However, an initial survey of simulation tools used for the modelling and simulation of NPP shows that existing simulation tools have some drawbacks in properly simulating the aforementioned interactions. In fact, they simulate detailed electrical power systems and thermomechanical systems but neglect the detailed interactions of the electrical system with thermomechanical and automation processes. To address this challenge, this paper develops an open-source co-simulation platform which connects Apros, a proprietary simulator of the thermomechanical and automation processes in NPP, to power system simulators. The proposed platform provides an opportunity to simulate both the electrical and thermomechanical systems of an NPP simultaneously, and study the interactions between them without neglecting any details. This detailed analysis can identify critical faults more accurately, and provides better support for probabilistic risk analyses (PRA) of NPP. To investigate the effectiveness of the proposed platform, detailed thermomechanical and electrical models of an NPP, located in Finland, are cosimulated. The preliminary results emphasize that neglecting the detailed interactions between domains of NPP may lead to inaccurate simulation results and may affect NPP safety.

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14

Rodriguez-Ibabe, J. M., and Beatriz López. "Austenite Grain Refinement in Direct Charging Based Thermomechanical Processes." Materials Science Forum 715-716 (April 2012): 711–18. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.711.

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Thermomechanical processes based on direct charging routes combined with near net shape technologies have become one of the main industrial production routes. The singularity of the coarse as cast initial austenite grain size, combined with the limited total applied strain during hot working, requires a tailored design of the composition and deformation schedules in order to achieve the required mechanical properties. This becomes more and more complex as higher steel grades combined with thicker sections are incorporated into production. This paper reviews the role played by the interaction of dynamic-metadynamic-static recrystallisation and strain induced precipitation on achieving the finest and most homogeneous austenite microstructures as possible, prior to transformation in the case of Nb, Nb-Mo and Ti microalloyed steels. Special emphasis will be put on the relevance of the kinetics of combined postdynamic softening mechanisms before a complete stop of recrystallisation due to precipitation occurs.

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Mašek, Bohuslav, Hana Jirková, Jiří Malina, and Štěpán Jeníček. "Advanced Material-Technological Modelling of Complex Dynamic Thermomechanical Processes." Materials Science Forum 654-656 (June 2010): 1594–97. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1594.

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Material-technological modelling has made great progress over recent years, thanks to the new possibilities opened up by developments in sensor technology, and especially in new methods of control, supported by innovative electronic elements and electronic circuits. One such device, developed for material-technological modelling, is the thermomechanical simulator which was established in the laboratories of the Research Centre of Forming Technologies FORTECH, in Pilsen, in the Czech Republic. Thanks to new knowledge and technical equipment the majority of technological processes or even technological chains can be modelled. The most considerable and most important innovation in the material-technological modelling process is the significant acceleration and increased precision of the modelling process. The present technology even allows modelling of highly dynamic processes, such as wire rolling including all thermodynamical effects. This paper presents the broad possibilities of the most modern material-technological modelling. The process of detecting technical and manufacturing problems during rolling and the possibilities of failure elimination are introduced in a practical example.

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Tykhan, M., I. Dilay, O. Markina, and V. Markovych. "Investigation of thermomechanical processes in miniature membrane elastic elements." Journal of Achievements in Materials and Manufacturing Engineering 1, no. 98 (January 1, 2020): 24–31. http://dx.doi.org/10.5604/01.3001.0014.0814.

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Purpose: The demand for the devices structures reliability and machines requires understanding elements operation, in particular elastic elements, under the effect of nonstationary temperature factors. Therefore, it is important to investigate the behaviour of these elements under variable temperature effecting. Design/methodology/approach: In this article, the temperature field and the thermal stresses of the membrane type elastic elements, as well as the thermal deformation of its body part were investigated by the method of numerical analysis. The theoretical results have experimental confirmation. Findings: The article shows possibilities significantly reduce the thermal stress in an elastic element, thereby increase its functional and structural reliability by varying the geometric parameters of the elastic element, the materials selection, and body shape. Research limitations/implications: Numerical modelling of thermal processes requires accurate information about the physico-mechanical properties of materials and heat-exchange coefficient, which in practice may differ from the theoretical ones. Therefore, experimental confirmation of research and decisions is needed. The influence of the "hot" thermal shock was investigated. There is performed interest to investigate the "cold" thermal shock. Practical implications: The obtained results allow creating elastic elements with better functional characteristics for operation in a wide temperature range. They can also be used in the designing of elastic elements not only of membrane type. Originality/value: Performed investigation of thermomechanical processes in the membrane elastic element has revealed important features of its temperature deformations with nonstationary thermal influence. Namely, the nature of thermal deformations can be changed by selecting the geometrical parameters of the element, its material, as well as the conditions of heat-exchange conditions with mating member (body). In this way, it is possible to obtain a controlled deformation and to design the elastic elements with predetermined functional tasks. On the other hand, the design of the membrane element body can create elastic hinges, which allows reducing the thermal stress in the membrane, which significantly increases the reliability of the element operation of this type in conditions of non-stationary temperatures. In general, the conducted investigations allow efficient design of elastic elements for devices, sensors and other precision mechanisms.

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17

Sieniutycz, Stanislaw. "Variational thermomechanical processes and chemical reactions in distributed systems." International Journal of Heat and Mass Transfer 40, no. 14 (September 1997): 3467–85. http://dx.doi.org/10.1016/s0017-9310(96)00235-9.

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18

Colombo, Tiago C. A., Alberto M. G. Brito, and Lirio Schaeffer. "Numerical Simulation of Thermomechanical Processes Coupled with Microstructure Evolution." Computing in Science & Engineering 16, no. 2 (March 2014): 10–15. http://dx.doi.org/10.1109/mcse.2013.18.

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McQueen, H. J. "Historical Evolution of Thermomechanical Processes Applied to Aluminium Alloys." Materials Science Forum 519-521 (July 2006): 1493–98. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1493.

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Thermo-mechanical processing (TMP), coined 50 years ago for steels to describe combined thermal and mechanical treatments that define both product shape and microstructure/properties, has been practiced since the early industrial revolution. The improved function and control in mechanical shaping equipment were easily adapted to newly discovered aluminum, integrating hot forming, cold deformation and annealing. The TMP goals for Al alloys were grain refinement, substructure preservation, texture control and enhanced precipitation. Hot extrusion became widely employed with exploitation of elongated grains with substructure and strong texture and of press heat treatment (solution during deformation, quenching upon exit). Rolling schedules were tuned to generate desired grain size/shape, substructure and texture. This historical account aims to enhance application of metallography to process optimization and innovation that makes metals more competitive with other materials.

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20

Celentano, Diego J. "Thermomechanical Simulation and Experimental Validation of Wire Drawing Processes." Materials and Manufacturing Processes 25, no. 7 (July 23, 2010): 546–56. http://dx.doi.org/10.1080/10426910903180003.

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21

Carpinteri, Andrea, and Carmelo Majorana. "Fully three-dimensional thermomechanical analysis of steel welding processes." Journal of Materials Processing Technology 53, no. 1-2 (August 1995): 85–92. http://dx.doi.org/10.1016/0924-0136(95)01964-g.

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22

Hrylits'kyi, D. V., O. O. Evtushenko, and V. I. Pauk. "Investigation of thermomechanical processes in the course of polishing." Materials Science 31, no. 2 (1996): 160–69. http://dx.doi.org/10.1007/bf00558635.

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Rudskoy, A. I., and N. G. Kolbasnikov. "Digital Twins of Processes of Thermomechanical Treatment of Steel." Metal Science and Heat Treatment 62, no. 1-2 (May 2020): 3–10. http://dx.doi.org/10.1007/s11041-020-00505-4.

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Evtushenko, A. A., N. V. Gorbacheva, and E. G. Ivanik. "Thermomechanical processes in the friction heating of disk brakes." Journal of Engineering Physics and Thermophysics 70, no. 1 (January 1997): 113–18. http://dx.doi.org/10.1007/s10891-997-0021-0.

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Kenzhegulov, B., Jaroslav Kultan, D. B. Alibiyev, and A. Sh Kazhikenova. "Numerical modeling of thermomechanical processes in heat-resistant alloys." Bulletin of the Karaganda University. "Physics" Series 98, no. 2 (June 30, 2020): 101–7. http://dx.doi.org/10.31489/2020ph2/101-107.

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This article presents a numerical simulation of thermomechanical processes in heat-resistant alloys. The authors develop the law of temperature distribution along the length of the physical body, which is considered as a rod of alloy EI-617. The authors also investigated the dependence of the magnitude of the elongation of the rod from a given temperature. To do this, the rod is conditionally divided into several elements, and then the study is carried out in one area. To determine the temperature dependence, the temperature distribution field is approximated by a full polynomial of the second degree, and approximation spline functions are introduced. Using a temperature gradient for one element, the functional expression characterizing the total thermal energy is written, first for the (n-1) element, then for the last n-th element. The total thermal energy is expressed by the formula    n i i JJ 1 . By minimizing the total thermal energy, we obtain a system of algebraic equations for determining the nodal values of temperatures. Applying the obtained values, the elongation of the element due to thermal expansion is calculated. The relationship between the temperature T, elongation T l , «tensile» force R , and «tensile stress» . is shown in the work. It is shown that with increasing temperature, the above values proportionally increase

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Guseva-Lozinski, Elena. "Modelling thermomechanical properties of the snowpack." Annals of Glaciology 31 (2000): 451–56. http://dx.doi.org/10.3189/172756400781819923.

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AbstractStudying the structure inside an inhomogeneous stratified snowpack is very important for modelling of the snowpack stability on mountain slopes, and to approximate surfaces of weak zones, and boundaries with different properties These surfaces are often the sliding surfaces of avalanches. Weather conditions" windpumping, snow densification and mechanical and complex heat- and mass-transfer processes define the structural variations of snow and the strength characteristics. The main ventilation components in the snowpack during the snowstorm are the heat and mass exchange between the snow grains and bonds, vapor and heat transfer. The vapor diffusion due to windpumping through snowpack intensifies the metamorphic process We propose the current mathematical model using meteorological data to simulate the snowpack characteristics in order to clarify the changes of the structural and physical-mechanical properties in the stratified snowpack under changing weather conditions. The system of equations allows calculation of the temperature variation in the snowpack, as well as in melted or frozen soil, the snow density, the structural parameters and the snowpack strength on the mountain slope as a function of the heat- and mass-transfer parameters. A numerical finite-difference model for simulations has been used. This allows prediction of the disposition of the depth-hoar layers and the physical-mechanical snow properties. The model has potential to estimate the potential avalanche volume.

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Li, Zhenghong, Yuheng Liu, Yafei Wang, Haibao Lu, Ming Lei, and Yong Qing Fu. "3D Printing of Auxetic Shape-Memory Metamaterial Towards Designable Buckling." International Journal of Applied Mechanics 13, no. 01 (January 2021): 2150011. http://dx.doi.org/10.1142/s1758825121500113.

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As one of the most popular 3D printed metamaterials, the auxetic structure with its tunable Poisson’s ratio has attracted huge amount of attention recently. In this study, we designed an auxetic shape-memory metamaterial, which showed designable buckling responses by using the thermomechanically coupled in-plane instability. The influence of viscoelasticity on in-plane moduli and Poisson’s ratios of shape-memory auxetic metamaterial was experimentally investigated. Based on the generalized Maxwell model and finite-element method, the buckling behaviors and their main influence factors were studied. The analytical results and experimental ones showed a good agreement. Thermomechanical properties of the printed metamaterials govern the temperature and strain rate-dependent buckling, and a controllable transition from the negative to positive Poisson’s ratio in the metamaterials can be achieved. Based on the shape memory effect, the buckled state and the Poisson’s ratio of the metamaterials can be tuned by programmed thermomechanical processes. This study provides a simple and efficient way to generate morphing structures using the designable buckling effect.

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Hachkevych, O. R., V. S. Mykhailyshyn, and A. Ravska-Skotnichna. "Residual Stresses due to High Temperature Annealing. Mathematical Model and Calculations." Materials Science Forum 524-525 (September 2006): 355–60. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.355.

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The mathematical model is developed for description of thermomechanical processes at cooling during high temperature annealing with the known initial temperature distribution (the temperature of holding) and stresses (acquired stresses at the final of a holding). It is taken into account the thermal sensitivity and material hardening at elasto-plastic solid deforming. The methodology based on the finite element method is proposed for solving thermomechanics problems of wide range. The suitable software is developed. At the final stage of annealing a cylindrical solid it is investigated residual stresses being formed on the cooling stage.

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Alekseev, M. V., N. G. Sudobin, A. A. Kuleshov, and E. B. Savenkov. "Mathematical Simulation of Thermomechanics in an Impermeable Porous Medium." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 4 (91) (August 2020): 4–23. http://dx.doi.org/10.18698/1812-3368-2020-4-4-23.

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The paper reports on mathematically simulating behaviour of a porous medium featuring isolated interstices filled with a chemically active substance by using a mathematical model of thermomechanics in the matrix and thermochemical processes inside the pores. We used three-dimensional thermomechanical equations to describe the behaviour of the medium. A lumped-element model accounting for chemical reactions and phase equilibrium describes the processes in pores. We outline the mathematical model of the medium and the respective computational algorithm. We provide parametric computation results using realistic thermophysical and thermodynamical parameters, composition of the organic substance found inside pores (products of thermal decomposition of kerogen) and chemical reactions, which show that it is necessary to employ complex, interconnected models to simulate the process class under consideration

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Kaputkina, Lyudmila M., Vera Prokoshkina, and Grigory Khadeev. "Effect of Nitrogen Addition on Tempering and Strain Aging Processes of Thermomechanically Strengthened Structural Steels." Materials Science Forum 738-739 (January 2013): 573–78. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.573.

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Mechanical behavior of structural nitrogen-containing steels with various structures and compositions, including the same steels with different summary C+N content and C/N ratio were studied using pressing tests in a wide temperature range, tensile tests, impact bending tests, hardness measurements and shock-wave loading resistance. The tempering and aging under load processes after quenching or thermomechanical treatment with various regimes have been investigated using optical and electron microscopies, X-ray diffraction analysis, calorimetric and dilatometric analyses. Hot strain resistance of the austenite is determined essentially by the steel composition, while the final structure and mechanical properties of hot-deformed austenite are determine mainly by hot deformation conditions. The higher the nitrogen content and C/N ratio, the higher hot strain resistance was and earlier the softening processes start, especially recrystallization process. The nitrogen microalloying of low-alloyed structural steels changes kinetics of the martensite tempering. Application of the high temperature thermomechanical treatment or combined thermomechanical strengthening with following tempering under load allows the use of these steels in a high-strength state after low-temperature tempering.

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Wang, Jun, Yingjie Xu, Weihong Zhang, and Xuanchang Ren. "Thermomechanical Modeling of Amorphous Glassy Polymer Undergoing Large Viscoplastic Deformation: 3-Points Bending and Gas-Blow Forming." Polymers 11, no. 4 (April 10, 2019): 654. http://dx.doi.org/10.3390/polym11040654.

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Polymeric products are mostly manufactured by warm mechanical processes, wherein large viscoplastic deformation and the thermomechanical coupling effect are highly involved. To capture such intricate behavior of the amorphous glassy polymers, this paper develops a finite-strain and thermomechanically-coupled constitutive model, which is based on a tripartite decomposition of the deformation gradient into elastic, viscoplastic, and thermal components. Constitutive equations are formulated with respect to the spatial configuration in terms of the Eulerian Hencky strain rate and the Jaumann rate of Kirchhoff stress. Hyperelasticity, the viscoplastic flow rule, strain softening and hardening, the criterion for viscoplasticity, and temperature evolution are derived within the finite-strain framework. Experimental data obtained in uniaxial tensile tests and three-point bending tests of polycarbonates are used to validate the numerical efficiency and stability of the model. Finally, the proposed model is used to simulate the gas-blow forming process of a polycarbonate sheet. Simulation results demonstrate well the capability of the model to represent large viscoplastic deformation and the thermomechanical coupling effect of amorphous glassy polymers.

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Voges-Schwieger, Kathrin, Sven Hübner, and Bernd Arno Behrens. "Enhancing Deep Drawing Processes by Using a Thermomechanical Tool Design." Key Engineering Materials 410-411 (March 2009): 595–600. http://dx.doi.org/10.4028/www.scientific.net/kem.410-411.595.

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The nature of phase transformation in metastable austenitic steels due to strain- induced ’-martensite formation is used as new contribution to lightweight construction in crash safety applications. A thermomechanical tool design was developed to enhance the ’-martensite evolution in local areas. Draw and stop beads allow a concerted stretch-out of material by increasing true strain . The local warming of defined regions avoids the phase transformation to retain the original austenitic lattice while a regional cooling enforce this nature by realizing a constant true strain .

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Stempflé, Philippe, Xavier Bourrat, Olivier Pantalé, Richard Kouitat Njiwa, Jean-Philippe Jehl, Anne Domatti, and Evelyne Lopez. "Multiscale structure of nacre biomaterial: Thermomechanical behavior and wear processes." Materials Science and Engineering: C 91 (October 2018): 78–93. http://dx.doi.org/10.1016/j.msec.2018.05.029.

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CELENTANO, D., S. OLLER, and E. OÑATE. "A finite element model for thermomechanical analysis in casting processes." Le Journal de Physique IV 03, no. C7 (November 1993): C7–1171—C7–1180. http://dx.doi.org/10.1051/jp4:19937182.

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SCHÖNAUER, M., T. RODIC, and D. R. J. OWEN. "Numerical modelling of thermomechanical processes related to bulk forming operations." Le Journal de Physique IV 03, no. C7 (November 1993): C7–1199—C7–1209. http://dx.doi.org/10.1051/jp4:19937185.

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Burak, Ya I., and T. S. Nagirnyi. "Mathematical modeling of local gradient processes in inertial thermomechanical systems." International Applied Mechanics 28, no. 12 (December 1992): 775–93. http://dx.doi.org/10.1007/bf00847314.

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Rogovoi, A. A., and O. S. Stolbova. "Modeling thermomechanical processes in shape memory polymers under finite deformations." Journal of Applied Mechanics and Technical Physics 56, no. 6 (November 2015): 1059–70. http://dx.doi.org/10.1134/s0021894415060164.

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Arora, Hitesh, Rupinder Singh, and Gurinder Singh Brar. "Thermal and structural modelling of arc welding processes: A literature review." Measurement and Control 52, no. 7-8 (June 19, 2019): 955–69. http://dx.doi.org/10.1177/0020294019857747.

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This paper presents a state-of-the-art critical review of the thermal and structural modelling of the arc welding process. During the welding process, high temperature in the welding zone leads to generation of unwanted residual stresses and results in weld distortion. Measurement of the temperature distribution was a key issue and challenge in the past decade. Thermomechanical analysis is among the best-known techniques to simulate and investigate the temperature distribution, welding distortion and residual stresses in the weld zone. The main emphasis of this review is the thermal and structural modelling of welding processes and the measurement of welding residual stresses using different techniques. The study also provides information about the various types of heat sources and models used to predict the weld bead characteristics and thermomechanical analysis for different welding processes such as tungsten inert gas welding, metal inert gas welding and shielded metal arc welding.

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Allen, David H. "Thermomechanical Coupling in Inelastic Solids." Applied Mechanics Reviews 44, no. 8 (August 1, 1991): 361–73. http://dx.doi.org/10.1115/1.3119509.

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Coupling between mechanical and thermodynamic processes can be significant in solid media when material inelasticity occurs. Significant mechanical energy may be converted into heat via hysteretic loss, and this coupling may be significant even under quasi-static conditions. Important advances have been made since the second world war in modeling this thermomechanical coupling. This paper reviews many of the major achievements on this subject. The paper opens with a short review of historical milestones on the subject. A theoretical model is then reviewed, including both conservation laws and constitutive models for certain classes of solids. The paper concludes with a discussion of recent attempts to solve the inelastic coupled thermomechanical field problem.

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Oryshchenko, A. S., V. A. Malyshevsky, and E. A. Shumilov. "Modeling of steel hardening process at thermal and mechanical treatment." Voprosy Materialovedeniya, no. 4(96) (January 8, 2019): 7–13. http://dx.doi.org/10.22349/1994-6716-2018-96-4-07-13.

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The article deals with modeling of thermomechanical processing of high-strength steels at the Gleeble 3800 research complex, simulating thermomechanical processing with various temperature and deformation parameters of rolling and with accelerated cooling to a predetermined temperature. The identity of steel hardening processes at the Gleeble 3800 complex and specialized rolling mills, as well as the possibility of obtaining steels of unified chemical composition, are shown.

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Hindmarsh, Richard C. A. "Thermomechanical coupling of ice flow with the bedrock." Annals of Glaciology 37 (2003): 390–96. http://dx.doi.org/10.3189/172756403781815988.

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AbstractTwo aspects of thermal coupling with bedrock are considered: the coupled time-dependent problem of co-evolving temperatures in lithosphere and ice; and the influence of basal topography on steady temperature distribution within the ice. The nature of the time-dependent coupling is found to depend on the horizontal velocity. As has been suggested, there is a cooling of steady temperatures on bedrock highs, but this is phase-shifted downstream when horizontal velocities increase. This observation may have consequences for geomorphological processes such as plucking and protection. The effect of bedrock channelling on steady temperature is considered. The positive anomaly of basal temperature due to channelling increases as the transverse wavelength decreases, but not monotonically, reaching a plateau when both the wavelengths of the basal topography are around 100 km.

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Souaï, Nadia, Roland E. Logé, Yvan Chastel, Nathalie Bozzolo, Vincent Maurel, and Loic Nazé. "Effect of Thermomechanical Processes on Σ3 Grain Boundary Distribution in a Nickel Base Superalloy." Materials Science Forum 638-642 (January 2010): 2333–38. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.2333.

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According to various studies, Grain Boundary Engineering (GBE) is likely to enhance mechanical properties of polycrystalline materials. The present investigation highlights some relationships between thermomechanical process (TMP) parameters of a commercial nickel-base superalloy PER72, supplied by Aubert & Duval (equivalent to Udimet®720™) and the resulting microstructure. The long-term goal is to develop TMPs that modify the Grain Boundary Character Distributions (GBCD) in order to improve high temperature properties. In this context, Grain Boundary Engineering (GBE) techniques are considered, thinking of replacing standard forming processes by optimised thermomechanical treatments. Mechanical testing at high temperature (compression and torsion tests) has been carried out and it is shown that multi-step treatments promote twinning. Some clues are then presented in an attempt to explain when and how twins are created.

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Regulski, Krzysztof, Danuta Szeliga, and Jan Kusiak. "Application of Regression Trees in Optimization of Metal Forming Process." Key Engineering Materials 622-623 (September 2014): 749–55. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.749.

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Application of sensitivity analysis in optimization of process parameters of production processes for innovative materials, e.g. dual phase steel, requires deterministic model of thermomechanical processes and large datasets that covers whole surface of results. Difficulties in optimization of process parameters correspond with large number of control variables, which should be considered in the technology design. Furthermore, conduction of such analysis takes the great computational cost. Presented work concerns possibility of application of regression trees, especially CART model, in preliminary analysis for sensitivity analysis. Use of data mining algorithms enables acquiring of preliminary, rough results: relationships among parameters of the hot rolling process of dual phase steel strips and rules of optimization of this process, it also does not require any apriori knowledge about thermomechanical processes.

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Prokoshkina, Vera, Liudmila M. Kaputkina, A. G. Svyazhin, and J. Siwka. "Structure Formation and Strengthening of Hot Deformed Nitrogen-Containing Steels." Advances in Science and Technology 56 (September 2008): 116–21. http://dx.doi.org/10.4028/www.scientific.net/ast.56.116.

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The structural and phase transformations and the strengthening of nitrogen-containing steels resulting from alloying and thermomechanical treatment have been investigated using X-ray diffraction analysis, optical microscopy, hardness measurements and tensile testing. For the modeling of thermomechanical treatment processes, a DIL 805A/D dilatometer with a deformation capability and a Gleeble 3800 simulator were used. Rational nitrogen or nitrogen plus carbon concentrations are determined by basic composition of an alloy. They are limited by the processes of precipitation of excess phases during crystallization and their dissolution during heating stage of the thermal or thermomechanical treatment. Combined alloying by carbon and nitrogen leads to significant complication of phase and structural transformations in steels, including hot deformation that manifests itself in changes of strain-stress diagram parameters. Effectiveness of increasing of a hot deformation resistance under alloying by nitrogen and carbon depends on a basic composition of steel, C/N ratio and temperature-strain rate deformation conditions.

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Vaskovsky, Yu M., and O. A. Geraskin. "INFLUENCE OF REGIME AND OPERATIONAL FACTORS ON THE DAMPER SYSTEM OF THE SALI-ENT-POLE SYNCHRONOUS MACHINE ROTOR." Tekhnichna Elektrodynamika 2021, no. 2 (February 23, 2021): 47–57. http://dx.doi.org/10.15407/techned2021.02.047.

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The physical processes in the damping system of the salient-pole synchronous machine rotor, which cause the gradual destruction of its structure, have been studied. In particular, the distributions of currents, temperatures and thermomechanical stresses in the damping system rods during its operation in asynchronous and asymmetric modes of operation, as well as in case of rotor eccentricity. A field mathematical model has been developed that takes into account the combined action of three physical fields of different nature: electromagnetic, temperaturic, and thermomechanical stress fields, and allows estimating heating and thermomechanical loads in the damping system of the rotor of the salient-pole synchronous machine. According to the results of the analysis, the heating and thermomechanical loads of the structural elements were determined and recommendations for its structural improvement were given. References 9, figures 9, tables 1.

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Syzdykov, E. K., V. V. Minin, and Yu I. Dimitrienko. "MODELING OF THERMOMECHANICAL PROCESSES IN COMPOSITE SHELLS IN LOCAL RADIATION HEATING." Composites: Mechanics, Computations, Applications, An International Journal 2, no. 2 (2011): 147–69. http://dx.doi.org/10.1615/compmechcomputapplintj.v2.i2.50.

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Усов, Анатолий Васильевич, and Елена Наиловна Богданова. "Robust control methods of thermomechanical processes in the machining of parts." Eastern-European Journal of Enterprise Technologies 5, no. 2(71) (October 24, 2014): 67. http://dx.doi.org/10.15587/1729-4061.2014.28074.

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Duygulu, Ozgur, Selda Ucuncuoglu, and Gizem Oktay Secgin. "Effect of Thermomechanical Processes on Twin Roll Casted Magnesium Alloy Sheets." Materials Science Forum 783-786 (May 2014): 369–74. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.369.

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6 mm thick and 1500 mm wide magnesium alloy AZ31, AZ61, AZ91, AM50 and AM60 sheets were produced by twin roll casting technique. Sheets were homogenized between 350-475oC for 1-24 h. AZ31 sheets were rolled down to 1 mm by symmetrical warm rolling and asymmetric warm rolling. Age hardening was also performed on magnesium alloy AZ91 sheets. Specimens were aged at 100-300oC for up to 100 h. Characterization was performed by light microscope, scanning electron microscopy-energy dispersive spectrometry (SEM-EDS), transmission electron microscopy (TEM) and x-ray diffraction (XRD) after twin roll casting and also after each thermomechanical process including aging. Tensile tests and micro hardness tests were performed for mechanical properties. In addition to the room temperature tests, elevated temperature tensile tests were also performed at 100, 150, 200, 250, and 300oC at various deformation speeds. Forming limit diagram of the material was determined under warm forming condition.

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Herdman, Terry, Pedro Morin, and Ruben D. Spies. "Convergent spectral approximations for the thermomechanical processes in shape memory alloys." Nonlinear Analysis: Theory, Methods & Applications 39, no. 1 (January 2000): 11–32. http://dx.doi.org/10.1016/s0362-546x(98)00159-x.

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Turteltaub, Sergio. "Optimal control and optimization of functionally graded materials for thermomechanical processes." International Journal of Solids and Structures 39, no. 12 (June 2002): 3175–97. http://dx.doi.org/10.1016/s0020-7683(02)00243-3.

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Journal articles on the topic 'Thermomechanical processes'

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