Journal articles: 'Thermomechanical behaviour'

1

Torrecillas, R., G. Fantozzi, S. de Aza, and J. S. Moya. "Thermomechanical behaviour of mullite." Acta Materialia 45, no. 3 (March 1997): 897–906. http://dx.doi.org/10.1016/s1359-6454(96)00226-1.

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2

Jones, R., T. E. Tay, and J. F. Williams. "Thermomechanical behaviour of composites." Computational Mechanics 5, no. 4 (1989): 255–61. http://dx.doi.org/10.1007/bf01046942.

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3

Warren, R. "Metal matrix composites—Thermomechanical behaviour." Composites 22, no. 1 (January 1991): 65. http://dx.doi.org/10.1016/0010-4361(91)90106-q.

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4

Zhou, C., and C. W. W. Ng. "A thermomechanical model for saturated soil at small and large strains." Canadian Geotechnical Journal 52, no. 8 (August 2015): 1101–10. http://dx.doi.org/10.1139/cgj-2014-0229.

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Many elastoplastic models have been developed for simulating thermomechanical behaviour of saturated soil. Although the yield surface of these models shrinks with temperature, its shape is always assumed to be independent of temperature. This simplification may induce errors in predicting thermal effects on shear behaviour. Furthermore, existing models tend to focus on thermomechanical behaviour at large strains. Behaviour such as the degradation of the shear modulus with strain at small strains (<1%) is often ignored. To address these issues, a new thermomechanical model is developed using the bounding surface plasticity theory. Both the size and shape of the bounding surface are allowed to change with temperature. The new model is able to predict elastoplastic response of saturated soil at small strains, even when stress path is within the bounding surface. Using this new model, thermomechanical behaviour of four different soils having different overconsolidation ratios is simulated. Comparisons between measured and computed results reveal that the new model is able to capture many vital aspects of thermomechanical behaviour, including volume changes during heating and cooling, and thermal effects on drained and undrained shear behaviour. In particular, it predicts a gradual degradation of the shear modulus at small strains. By incorporating thermal effects on the shape of the bounding surface, the modelling of thermomechanical behaviour, especially the effective stress path during undrained shearing, is improved.

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Melnik, R. V. N., and A. J. Roberts. "Thermomechanical behaviour of thermoelectric SMA actuators." Le Journal de Physique IV 11, PR8 (November 2001): Pr8–515—Pr8–520. http://dx.doi.org/10.1051/jp4:2001886.

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Marewski, U., D. Stöver, and R. Hecker. "Thermomechanical behaviour of thin oxide coatings." Surface and Coatings Technology 46, no. 1 (May 1991): 47–63. http://dx.doi.org/10.1016/0257-8972(91)90149-q.

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7

Hamidouche, M., N. Bouaouadja, H. Osmani, R. Torrecillias, and G. Fantozzi. "Thermomechanical behaviour of mullite-zirconia composite." Journal of the European Ceramic Society 16, no. 4 (January 1996): 441–45. http://dx.doi.org/10.1016/0955-2219(95)00110-7.

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8

Colclough, A., B. Dempster, Y. Favry, and D. Valentin. "Thermomechanical behaviour of SiCAl composites." Materials Science and Engineering: A 135 (March 1991): 203–7. http://dx.doi.org/10.1016/0921-5093(91)90562-2.

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9

Fabregat-Sanjuan, Albert, Francesc Ferrando, Cristina Urbina, and Silvia de la Flor. "TiNiCu Martensitic Transformation Characterization at Low Stress Levels through Thermomechanical Cycling." Materials Science Forum 738-739 (January 2013): 367–71. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.367.

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This investigation has studied the characterization of the thermomechanical behaviour of a TiNiCu shape memory alloy with different heat treatments. This characterization has been done by analyzing martensitic transformation at constant stress tests. The martensitic transformation was analyzed by measuring electrical resistance and strain. The results showed that orientation is reached at different stress levels during each heat treatment; low stress thermomechanical cycling does not affect transformation temperatures and thermomechanical cycling at upper stress levels produces different changes of behaviour depending on the stress level and/or heat treatment.

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10

Grajcar, Adam, and Mateusz Morawiec. "Microstructure-Property Relationships in Medium-Mn Steels with Metastable Retained Austenite." Materials Science Forum 879 (November 2016): 619–24. http://dx.doi.org/10.4028/www.scientific.net/msf.879.619.

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The study addresses relationships between the microstructure and mechanical properties of thermomechanically processed carbide-free bainitic steels containing 3% and 5% Mn. A simulated thermomechanical processing using Gleeble equipment and thermomechanical hot strip rolling were applied to produce fine-grained mixtures of blocky-type and interlath metastable retained austenite embeded between bainitic ferrite laths. To monitor the transformation behaviour of retained austenite into strain-induced martensite interrupted tensile tests were applied. The identification of morphological features of retained austenite and strain-induced martensite was carried out using scanning electron microscopy (SEM) equipped with EBSD (Electron Backscatter Diffraction). The amount of retained austenite was determined by the EBSD technique. It was found that manganese content strongly affects mechanical stability of retained austenite resulting in a different degree of TRIP effect in the investigated alloys and subsequent mechanical properties of produced sheets.

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11

Dmitriev, S. V., L. Kh Galiakhmetova, and E. A. Korznikova. "Anomalous Thermomechanical Behaviour of Carbon Nanotube Bundle." Reviews on advanced materials and technologies 3, no. 3 (2021): 10–15. http://dx.doi.org/10.17586/2687-0568-2021-3-3-10-15.

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The molecular dynamics method is used to calculate the dependence of pressure on temperature at a constant volume for a bundle of carbon nanotubes (CNTs) considered under plane strain conditions. A chain model with a significantly reduced number of degrees of freedom is used for modeling. The influence of the CNT diameter is analyzed. It was found that for some parameters of the model, the pressure in the CNT bundle can decrease with increasing temperature, which is equivalent to the effect of negative thermal expansion.

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12

Lee, K. L., H. E. Carroll, and A. F. Whitehouse. "Thermomechanical behaviour of a copper–chromiumin situcomposite." Materials Science and Technology 16, no. 7-8 (July 2000): 811–16. http://dx.doi.org/10.1179/026708300101508487.

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13

Lee, H. T., J. C. Chen, and J. M. Wang. "Thermomechanical behaviour of metals in cyclic loading." Journal of Materials Science 28, no. 20 (October 1993): 5500–5507. http://dx.doi.org/10.1007/bf00367821.

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14

Sepulveda-Macias, Matias, Gergely Molnár, and Anne Tanguy. "Thermomechanical dissipative behaviour of CuZr metallic glasses." Journal of Non-Crystalline Solids 636 (July 2024): 123028. http://dx.doi.org/10.1016/j.jnoncrysol.2024.123028.

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15

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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16

Egner, Władysław, Piotr Sulich, Stanisław Mroziński, and Halina Egner. "Temperature-Dependent Fatigue Characteristics of P91 Steel." Acta Mechanica et Automatica 14, no. 2 (June 1, 2020): 69–78. http://dx.doi.org/10.2478/ama-2020-0010.

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AbstractIn this paper, the experimental investigations, constitutive description and numerical modelling of low-cycle fatigue behaviour of P91 steel in non-isothermal conditions are presented. First, experimental tests are performed to recognise different aspects of material behaviour. Then, an appropriate constitutive model is developed within the framework of thermodynamics of irreversible processes with internal state variables. The model describes two phases of cyclic softening, related to plastic mechanisms. An important goal of the presented research is to include thermomechanical coupling in the constitutive modelling. Next, the model parameters are identified based on the available experimental data. Some parametric studies are presented. Finally, numerical simulations are performed, which indicate the significant influence of thermomechanical coupling on the response of the constitutive model in thermomechanical fatigue conditions.

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17

Peron, Mael, Vincent Sobotka, Nicolas Boyard, and Steven Le Corre. "Thermomechanical Effects in PVTα Measurements." Key Engineering Materials 611-612 (May 2014): 1584–91. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.1584.

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Knowledge of the different properties of thermoset composite materials is of great importance for the manufacturing of high quality composite parts. The resin bulk modulus is one of them and is essential to define the composite parts compressive behaviour under uniform compression. The evolution of this property with temperature and conversion degree of reaction is a challenging task and has been tentatively measured with a home-made apparatus, named PVTα, on which temperature, volume change and degree of cure are simultaneously recorded. But as the sample is contained in a non-reactive and deformable capsule, which mechanical behaviour may interfere with the measurement, a validation is required. The aim of this work is to develop a finite element model of the problem in order to simulate the thermal mechanical behaviour of the sample and the capsule, and so to validate the measurement process. The multiphysical numerical model accounts for phase change kinetics and non-linear thermal properties as well as thermo-dependent elastic properties, all problems being solved through a strong iterative coupling scheme. Mechanical contact problems between the capsule and the resin sample are handled through a penalization method contact algorithm which enables to capture the effects of chemical and thermal shrinkage in the sample and the capsule. The heterogeneous stress state generated by the material transformation is assumed to induce heterogeneous strain states which may lead to misinterpretations of macroscopic measurements. This model is a first approach and will be improved using a more sophisticated rheological model. Nevertheless, results show that the usual experimental analysis method can be used as long as the gel point is not reached. After a certain conversion degree, the measured bulk modulus is different from the effective one so corrections have to be brought.

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18

Rödig, M., R. Duwe, W. Kühnlein, J. Linke, and A. Schuster. "Behaviour of carbon and beryllium under thermomechanical loads." Physica Scripta T64 (January 1, 1996): 60–66. http://dx.doi.org/10.1088/0031-8949/1996/t64/009.

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19

Chawla, N. "Thermomechanical behaviour of environmentally benign Pb-free solders." International Materials Reviews 54, no. 6 (November 2009): 368–84. http://dx.doi.org/10.1179/174328009x461069.

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20

Delbressine, F. L. M., G. H. J. Florussen, L. A. Schijvenaars, and P. H. J. Schellekens. "Modelling thermomechanical behaviour of multi-axis machine tools." Precision Engineering 30, no. 1 (January 2006): 47–53. http://dx.doi.org/10.1016/j.precisioneng.2005.05.005.

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21

Reibaldi, G. G. "Thermomechanical behaviour of CFRP tubes for space structures." Acta Astronautica 12, no. 5 (May 1985): 323–33. http://dx.doi.org/10.1016/0094-5765(85)90066-9.

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22

Chrysochoos, André, and Germain Martin. "Tensile test microcalorimetry for thermomechanical behaviour law analysis." Materials Science and Engineering: A 108 (February 1989): 25–32. http://dx.doi.org/10.1016/0921-5093(89)90402-4.

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23

Siryabe, Emmanuel. "Coupled Thermomechanical Dynamics of Phase Transitions in Shape Memory Alloys and Related Nonlinear Phenomena." Materials Plus 2, no. 1 (June 16, 2023): 35–49. http://dx.doi.org/10.37256/mp.2120232743.

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The aim of this paper is to study the coupled non-linear dynamics of the behaviour of Shape Memory Alloys (SMA) under harmonic excitation. The thermomechanical model developed by Falk and based on Landau theory is used to describe the coupled thermomechanical behaviour of the SMA mass-damper-bar system. Fully coupled mechanical and thermal field equations are established to reveal the strong coupling phenomena arising from the phase transition. Then, the harmonic balance method is used to obtain the steady-state frequency responses. The effect of thermomechanical coupling on the frequency and time response curves is taken into account by modifying the heat transfer coefficient. The results show that deformation and temperature provide a stable sinusoidal response. The analysis of the results leads to different ways of controlling the nature and extent of the coupled and non-linear response of SMA-based oscillators. Comparison of the analytical results with experimental data from the literature validates the coupled thermomechanical nonlinear model. These results can be used effectively to control the external vibrations of various systems.

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24

Moraes, P. Dias de, Y. Rogaume, and P. Triboulot. "Influence of temperature on the modulus of elasticity (MOE) of Pinus sylvestris L." Holzforschung 58, no. 2 (March 15, 2004): 143–47. http://dx.doi.org/10.1515/hf.2004.021.

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Abstract The influence of temperature on the modulus of elasticity (MOE) and on the flexural stiffness of Pinus sylvestris L. was determined under temperature conditions ranging from 25 to 300°C for samples with a water content of about 6.0%. The experiments were carried out on microsamples, with a thermomechanical analyser, in isothermal conditions and under temperature ramping rates. The behaviour of the curves of the MOE is explained by wood drying and by the behaviour of the wood polymers as a function of temperature. The results obtained by thermomechanical analysis were validated by the results obtained by centre-point bending tests on small scale samples, which therefore allows for its use in modelling the behaviour of timber structures during a fire.

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25

Kinkorová, Tereza. "Thermomechanical calculation within the HERA programme." Acta Polytechnica CTU Proceedings 44 (December 1, 2023): 5–12. http://dx.doi.org/10.14311/app.2023.44.0005.

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HERA (High Burnup Experiments in Reactivity Initiated Accident) is one of the programmes which should replace closed Halden reactor. As the name implies HERA is focused on the tests simulated RIA (Reactivity Initiated Accident) and the aim of the programme is to investigate the performance and behaviour of high burnup fuel in RIA transients. The first phase of HERA programme consists of two steps which are the blind calculation of different RIA scenarios (different pulse width, enthalpy increase, hydrogen content and gap size) and in-reactor test with fresh fuel.The set of thermomechanical calculation was performed with the FRAPTRAN computer code as part of the first phase of HERA. The influence of several parameters on the fuel behaviour was observed, the varying parameters were the pulse width, peak radial average enthalpy increase, hydrogen content and the hydrogen rim size and gap size. In addition, the effect of type and setting of boundary condition was investigated.

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26

Schneider, S. V., Martine Desmaison-Brut, G. Richter, and Christian Gault. "Thermomechanical Behaviour of TiB₂-AlN Composites." Key Engineering Materials 132-136 (April 1997): 524–27. http://dx.doi.org/10.4028/www.scientific.net/kem.132-136.524.

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27

Mechalikh, M., A. Benhamou, I. Zidane, and A. Bettahar. "Study of Piston Thermo-Elastic Behaviour under Thermomechanical Solicitations." International Journal of Automotive and Mechanical Engineering 16, no. 4 (December 30, 2019): 7287–98. http://dx.doi.org/10.15282/ijame.16.4.2019.08.0542.

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The piston material choice is a major factor in the design stages of internal combustion engines for its importance to improving the durability and the operation reliability during the piston life cycle. Indeed, even as many researches have been conducted for a long time to improve the piston performances in the diesel engine, considerable numbers of piston damages still significantly occur. This research work is an assessment by the finite element method (FEM) of a set of piston materials for the purpose of being used in a direct injection diesel engine. The main objective is to predict stresses concentrations and the clearance between the piston and the cylinder (to avoid metal-metal adhesion) from thermomechanical solicitations. The stresses and deformations are evaluated in a 3D piston model by using ABAQUS software. A first assessment step is performed in heat convection/conduction modes to determine the temperature distribution. Then, this last one is coupled to the pressure field resulting from the gas combustion in order to compute stresses and the magnitude displacement. The obtained results show that the austenitic steel AS12UNG with fibre-reinforced possess low thermomechanical stress values compared to other material types. This material allows a minimum failure risk and therefore contributes to the enhancement of the piston design.

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28

Genovese, K., L. Lamberti, and C. Pappalettere. "Structural behaviour of endodontically treated teeth under thermomechanical loading." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 220, no. 8 (August 2006): 909–28. http://dx.doi.org/10.1243/09544119jeim108.

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29

Moussa, Mohamed O., Ziad Moumni, Olivier Doaré, Cyril Touzé, and Wael Zaki. "Non-linear dynamic thermomechanical behaviour of shape memory alloys." Journal of Intelligent Material Systems and Structures 23, no. 14 (June 2012): 1593–611. http://dx.doi.org/10.1177/1045389x12448446.

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30

Trentadue, Bartolomeo, and Giuseppe Illuzzi. "Thermomechanical Behaviour of a PWB by Speckle Interferometry Technique." Active and Passive Electronic Components 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/141583.

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The speckle interferometry technique has been used in this work in order to determine the thermomechanical behaviour of Printed Wiring Board (PWB) (circuits) of a radio integrated with tape player and speakers. A preliminary experiment of such technique has been carried out on a single electronic component (silicon transistor), during the thermal transient and at the steady state. The thermal deformation and stresses on PWB have been obtained through related experimental analyses on both cases. The results showed a very good applicability of speckle technique on the irregular object surface as PWB.

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31

Androulidakis, Charalampos, and Costas Galiotis. "Thermomechanical behaviour of hexagonal boron nitride at elevated temperatures." 2D Materials 7, no. 4 (July 27, 2020): 045011. http://dx.doi.org/10.1088/2053-1583/ab9ea5.

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32

Gasser, A., P. Boisse, Y. Dutheillet, and J. Poirier. "Experimental and numerical analyses of thermomechanical refractory lining behaviour." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 215, no. 1 (January 2001): 41–54. http://dx.doi.org/10.1177/146442070121500104.

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33

Reimann, J., E. Arbogast, M. Behnke, S. Müller, and K. Thomauske. "Thermomechanical behaviour of ceramic breeder and beryllium pebble beds." Fusion Engineering and Design 49-50 (November 2000): 643–49. http://dx.doi.org/10.1016/s0920-3796(00)00357-4.

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34

Hegeman, J. B. J., E. D. L. van Essen, M. Jong, J. G. van der Laan, and J. Reimann. "Thermomechanical behaviour of ceramic breeder pebble stacks for HICU." Fusion Engineering and Design 69, no. 1-4 (September 2003): 425–29. http://dx.doi.org/10.1016/s0920-3796(03)00086-3.

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35

Samrout, H. "Fatigue behaviour of 28CrMoV5-08 steel under thermomechanical loading." International Journal of Fatigue 20, no. 8 (September 1998): 555–63. http://dx.doi.org/10.1016/s0142-1123(97)00130-8.

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36

Grognet, S., H. Atmani, L. Driouch, R. Krishnan, and P. Vigier. "Thermomagnetic and thermomechanical behaviour of amorphous Fe1 − x ribbons." Materials Letters 28, no. 1-3 (September 1996): 113–17. http://dx.doi.org/10.1016/0167-577x(96)00037-7.

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37

Singh, Ripudaman, and T. S. Ramamurthy. "Thermomechanical behaviour of pin joints subjected to sheet loads." International Journal of Mechanical Sciences 35, no. 1 (January 1993): 1–17. http://dx.doi.org/10.1016/0020-7403(93)90060-8.

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38

Hopmann, Christian, Maiko Ersch, and Jens van Haag. "Calculating the Thermomechanical Behaviour of Plastic-metal Hybrid Components." ATZ worldwide 119, no. 4 (March 15, 2017): 34–39. http://dx.doi.org/10.1007/s38311-017-0009-0.

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39

Alekseev, Mikhail Vladislavovich, Andrey Aleksandrovich Kuleshov, Nikolay Grigoryevich Sudobin, and Evgeny Borisovich Savenkov. "Mathematical modelling of thermomechanical behaviour of impermeable porous media." Keldysh Institute Preprints, no. 136 (2018): 1–23. http://dx.doi.org/10.20948/prepr-2018-136.

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40

Birkinshaw, C., C. J. McCarthy, N. Regan, M. D. C. Hale, D. Cahill, and M. McCourt. "The Thermomechanical Behaviour of Wood Subject to Fungal Decay." Holzforschung 53, no. 5 (September 10, 1999): 459–64. http://dx.doi.org/10.1515/hf.1999.076.

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Summary Specimens of Pinus sylvestris have been subject to decay by the brown rot fungus Coniophora puteana, the white rot fungus Phanerochaete chrysosporium, and to doses of γ irradiation sufficiently high to cause significant molecular damage. Specimens of Picea abies have been subject to decay by the brown rot fungus Postia placenta. The dynamic mechanical properties of the decayed and degraded materials have been assessed between −100 °C and 120 °C using in some cases a natural frequency instrument and in other cases a driven frequency instrument. The results obtained have allowed calculation of the temperature coefficients of modulus for the materials at various stages of decay or degradation, and these are relatively constant regardless of the history of the specimen. Such changes as do occur can be explained by modulus dependent frequency effects. The static mechanical properties of some specimens were also assessed by three point bending at 20 °C. Measured changes in dynamic stiffness and flexural modulus have been compared with the weight changes and the proportionality constant relating strength and stiffness loss to weight loss obtained for each situation. These show that in the case of fungal attack the dynamic stiffness falls more quickly than flexural strength, and that, as would be expected, the brown rot fungi are the more effective at reducing mechanical properties.

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41

Garcia, Irene T. S., and Dimitrios Samios. "Thermomechanical behaviour of semicrystallinepolymers submitted to plane-strain compression." Polymer 39, no. 12 (1998): 2563–69. http://dx.doi.org/10.1016/s0032-3861(97)00588-0.

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42

Novakovic, Lj, V. Markovic, O. Gal, and V. T. Stannett. "Thermomechanical behaviour of stabilized polyethylene irradiated with gamma rays." International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry 27, no. 1 (January 1986): 1–5. http://dx.doi.org/10.1016/1359-0197(86)90003-2.

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43

Wärner, Hugo, Mattias Calmunger, Guocai Chai, Sten Johansson, and Johan Moverare. "Thermomechanical fatigue behaviour of aged heat resistant austenitic alloys." International Journal of Fatigue 127 (October 2019): 509–21. http://dx.doi.org/10.1016/j.ijfatigue.2019.06.012.

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44

Isreb, Mohammad, Marianiki Chalkia, Timothy Gough, Robert Thomas Forbes, and Peter Timmins. "A Combined Rheological and Thermomechanical Analysis Approach for the Assessment of Pharmaceutical Polymer Blends." Polymers 14, no. 17 (August 27, 2022): 3527. http://dx.doi.org/10.3390/polym14173527.

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The viscoelastic nature of polymeric formulations utilised in drug products imparts unique thermomechanical attributes during manufacturing and over the shelf life of the product. Nevertheless, it adds to the challenge of understanding the precise mechanistic behaviour of the product at the microscopic and macroscopic level during each step of the process. Current thermomechanical and rheological characterisation techniques are limited to assessing polymer performance to a single phase and are especially hindered when the polymers are undergoing thermomechanical transitions. Since pharmaceutical processing can occur at these transition conditions, this study successfully proposes a thermomechanical characterisation approach combining both mechanical and rheological data to construct a comprehensive profiling of polymeric materials spanning both glassy and rubbery phases. This approach has been used in this study to assess the mechanical and rheological behaviour of heterogenous polymer blends of hydroxypropyl cellulose (HPC) and hydroxypropyl methylcellulose (HPMC) over a shearing rate range of 0.1–100 s−1 and a temperature range of 30–200 °C. The results indicate that HPC and HPMC do not appear to interact when mixing and that their mixture exhibits the mechanistic properties of the two individual polymers in accordance with their ratio in the mixture. The ability to characterise the behaviour of the polymers and their mixtures before, throughout, and after the glassy to rubbery phase transition by application of the combined techniques provides a unique insight towards a quality-by-design approach to this and other polymer-based solid dosage forms, designed with the potential to accelerate their formulation process through obviating the need for multiple formulation trials.

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45

Li, Zhenghong, Haibao Lu, Yongtao Yao, and Long Lin. "Thermomechanical performance and shape recovery behaviour of shape memory polymer nanocomposite incorporated with hexagonal boron nitride." Pigment & Resin Technology 46, no. 1 (January 3, 2017): 79–83. http://dx.doi.org/10.1108/prt-01-2016-0016.

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Purpose The purpose of this paper is to develop an effective approach to significantly improve the thermomechanical properties of shape memory polymer (SMP) nanocomposites that show fast thermally responsive shape recovery. Design/methodology/approach Hexagonal boron nitrides (h-BNs) were incorporated into polymer matrix in an attempt to improve the thermal conductivity and thermally responsive shape recovery behaviour of SMP, respectively. Thermally actuated shape recovery behaviour was recorded and monitored instrumentally. Findings The results show that both glass transition temperature (Tg) and thermomechanical properties of the SMP nanocomposites have been progressively improved with increasing concentration of h-BNs. Analytical results also suggest that the fast-responsive recovery behaviour of the SMP nanocomposite incorporated with h-BNs was due to the increased thermal conductivity. Research limitations/implications A simple way for fabricating SMP nanocomposites with enhanced thermally responsive shape recovery based on the incorporation of h-BNs was developed. Originality/value The outcome of this study may help fabrication of SMP nanocomposites with fast responsive recovery behaviour.

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46

Vasconcelos, Patricia, Adam Giessmann, João Dias-de-Oliveira, and António Andrade-Campos. "Heat Treatments Analysis of Steel Using Coupled Phase Field and Finite Element Methods." Key Engineering Materials 611-612 (May 2014): 117–24. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.117.

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Steels are known for their remarkable mechanical properties being extensively used in industry. Furthermore, phase transformations in metals and alloys, particularly in steels, are widely studied due to their importance. The understanding of the microstructure evolution in this type of materials is vital to reproduce the thermomechanical behaviour and to create new materials. To analyse the thermomechanical behaviour of steel during phase transition of steels, a phase field model was coupled with a finite element model in order to simulate the heat treatment and microstructure evolution of austenite to pearlite/ferrite. The thermoelastoplastic constitutive equations for each phase were implemented through a user routine in commercial FE software. This procedure presents a more quantitative understanding of the phase transformation in steels and a deeper comprehension of the mechanical behaviour of these materials when subject to heat treatments.

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47

Xiao, Heng, Otto Bruhns, and Albert Meyers. "Thermoinduced plastic flow and shape memory effects." Theoretical and Applied Mechanics 38, no. 2 (2011): 155–207. http://dx.doi.org/10.2298/tam1102155x.

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We propose an enhanced form of thermocoupled J2-flow models of finite deformation elastoplasticity with temperature-dependent yielding and hardening behaviour. The thermomechanical constitutive structure of these models is rendered free and explicit in the rigorous sense of thermodynamic consistency. Namely, with a free energy function explicitly introduced in terms of almost any given form of the thermomechanical constitutive functions, the requirements from the second law are identically fulfilled with positive internal dissipation. We study the case when a dependence of yielding and hardening on temperature is given and demonstrate that thermosensitive yielding with anisotropic hardening may give rise to appreciable plastic flow either in a process of heating or in a cyclic process of heating/cooling, thus leading to the findings of one- and two-way thermoinduced plastic flow. We then show that such theoretical findings turn out to be the effects found in shape memory materials, such as one- and two-way memory effects. Thus, shape memory effects may be explained to be thermoinduced plastic flow resulting from thermosensitive yielding and hardening behaviour. These and other relevant facts may suggest that, from a phenomenological standpoint, thermocoupled elastoplastic J2-flow models with thermosensitive yielding and hardening may furnish natural, straightforward descriptions of thermomechanical behaviour of shape memory materials.

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Sivasanghari Karunakaran, Dayang Laila Abang Abdul Majid, Che Nor Aiza Jaafar, Muhammad Hussain Ismail, and Husam Yahya Imran. "Heating Techniques of Shape Memory Alloy (SMA) - A Review." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 99, no. 2 (November 11, 2022): 207–20. http://dx.doi.org/10.37934/arfmts.99.2.207220.

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Shape Memory Alloy (SMA) possess memory capability to revert its original shape when exposed to load or temperature changes. This unique thermomechanical property occurs during solid state phase transformations which corresponds to functional properties of SMA, shape memory effect (SME) and super elasticity (SE). The significant coupling behaviour of SMA can be utilized as actuator in aerospace, automotive, electrical and civil fields. However, in practical applications, the coupling behaviour of SMA are non-linear and hysteretic. The control mechanism of SMA coupling behaviour is complex. Therefore, in order to achieve good control of thermomechanical properties, a highly controllable and promising heating technique is required. Thus, this paper reviewed the existing heating techniques for the SMA intending to find a controllable heating technique for the SMA. Besides that, this review suggested the promising induction heating for SMA thermomechanical characterization which offer temperature controllability and faster heating capability. However, till date most of research works are purely empirical. The present paper is able to provide an insight on the experimental approaches toward induction heating of SMA. Thus, the main aim of this paper is to provide a better understanding on the heating mechanism of SMA to develop an optimized utilization of SMA as an actuator.

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Leidermark, Daniel, Robert Eriksson, James P. Rouse, Christopher J. Hyde, and Svjetlana Stekovic. "Thermomechanical fatigue crack initiation in disc alloys using a damage approach." MATEC Web of Conferences 165 (2018): 19007. http://dx.doi.org/10.1051/matecconf/201816519007.

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A fatigue crack initiation model based on damage accumulation via a fatigue memory surface in conjunction with a plastic strain energy parameter was evaluated for thermomechanical fatigue loading in a gas turbine disc alloy. The accumulated damage in each hysteresis loop was summed up, and it was assumed that the damage at the stable state is repeated until failure occurs. Crack initiation occurs when enough fatigue damage has been obtained, and the number of cycles can thus be directly determined. The fatigue damage is highly coupled to the constitutive behaviour of the material, where the constitutive behaviour was modelled using a non-linear hardening description. Based on this, a stable state was achieved and the obtained damage could be extracted. A user-defined material subroutine was implemented, incorporating both the constitutive description and the fatigue damage accumulation. The framework was adopted in a finite element context to evaluate the thermomechanical fatigue crack initiation life of the disc alloy RR1000. From the evaluation it could be seen that a good prediction of the thermomechanical fatigue life was achieved compared to performed experiments.

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Springer, S., A. Röcklinger, M. Leitner, F. Grün, T. Gruber, M. Lasnik, and B. Oberwinkler. "Implementation of a viscoplastic substrate creep model in the thermomechanical simulation of the WAAM process." Welding in the World 66, no. 3 (December 11, 2021): 441–53. http://dx.doi.org/10.1007/s40194-021-01232-x.

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AbstractThis research work focusses on the implementation of a viscoplastic creep model in the thermomechanical simulation of the wire arc additive manufacturing (WAAM) process for Ti-6Al-4 V structures. Due to the characteristic layer by layer manufacturing within the WAAM process, viscoplastic material effects occur, which can be covered by implementing a creep model in the thermomechanical simulation. Experimental creep tests with a wide temperature, load and time range were carried out to examine short-term creep behaviour in particular. A Norton-Bailey creep law is used to accurately fit the experimental data and describe the base material’s creep behaviour. Subsequently, the fitted Norton-Bailey creep law was implemented in the thermomechanical simulation of the WAAM process. Finally, to determine the effect of creep on global distortion and local residual stress state in the substrate, simulations of a simplified linear, three-layer WAAM structure, with and without applying the implemented creep law, were carried out and compared to experimental data. The thermomechanical simulation with implemented creep model reveals a significant improvement in the numerical estimation of distortion and residual stress state in the substrate. The maximum distortion is reduced by about 13% and respectively the mean absolute percentage error between simulation and experiment decreases by about 34%. Additionally, the estimation accuracy with respect to the local residual stress state in the substrate improved by about 10%.

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Journal articles on the topic 'Thermomechanical behaviour'

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