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Статті в журналах з теми "Thermomechanical model":
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Shamim, Muhammad Babar, Marian Hörsting, and Stephan Wulfinghoff. "Variational Reduced-Order Modeling of Thermomechanical Shape Memory Alloy Based Cooperative Bistable Microactuators." Actuators 12, no. 1 (January 10, 2023): 36. http://dx.doi.org/10.3390/act12010036.
This article presents the formulation and application of a reduced-order thermomechanical finite strain shape memory alloy (SMA)-based microactuator model for switching devices under thermal loading by Joule heating. The formulation is cast in the generalized standard material framework with an extension for thermomechanics. The proper orthogonal decomposition (POD) is utilized for capturing a reduced basis from a precomputed finite element method (FEM) full-scale model. The modal coefficients are computed by optimization of the underlying incremental thermomechanical potential, and the weak form for the mechanical and thermal problem is formulated in reduced-order format. The reduced-order model (ROM) is compared with the FEM model, and the exemplary mean absolute percentage errors for the displacement and temperature are 0.973% and 0.089%, respectively, with a speedup factor of 9.56 for a single SMA-based actuator. The ROM presented is tested for single and cooperative beam-like actuators. Furthermore, cross-coupling effects and the bistability phenomenon of the microactuators are investigated.
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Kennett, S. C., George Krauss, and Kip O. Findley. "Strengthening Mechanisms in Low Carbon Lath Martensite as Influenced by Austenite Conditioning." Materials Science Forum 941 (December 2018): 574–82. http://dx.doi.org/10.4028/www.scientific.net/msf.941.574.
Low carbon lath martensitic microstructures are used in various steel products requiring high strength and toughness. These microstructures are conventionally produced through re-austenitizing and quenching followed by low or high temperature tempering. It is also possible to produce lath martensite through direct quenching immediately following thermomechanical processing. In this study, deformation below the austenite recrystallization temperature before quenching to form martensite was simulated through laboratory scale Gleeble processing of a 0.2 weight percent carbon ASTM A514 steel microalloyed with up to 0.21 weight percent niobium. Thermomechanical processing generally increases the dislocation density of the as-quenched martensite, which is sensitive to the austenite grain size before thermomechanical processing. The hardness of the thermomechanically-processed steels is generally greater than steels austenitized at comparable temperatures without deformation; this hardness difference is attributed to the increase in dislocation density and increased lath misorientation in the thermomechanically-processed conditions. The hardness is generally independent of prior austenite grain size for the thermomechanically processed conditions in contrast to conventionally austenitized and quenched conditions, which have a Hall-Petch correlation with austenite grain size. The strength increase of the thermomechanically processed conditions compared to the conventionally austenitized and quenched conditions is maintained after tempering. However, there is a larger drop in strength for small prior austenite grain sizes for both conventionally austenitized and quenched and thermomechanically processed steels. Overall, the strength of these lath martensitic steels can be directly related to dislocation density through a Taylor hardening model.
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Abuel-Naga, H. M., D. T. Bergado, A. Bouazza, and M. Pender. "Thermomechanical model for saturated clays." Géotechnique 59, no. 3 (April 2009): 273–78. http://dx.doi.org/10.1680/geot.2009.59.3.273.
Rojas, Eduardo, and Paul Garnica. "Thermomechanical Anisotropic Model for Soils." Soils and Foundations 40, no. 2 (April 2000): 61–75. http://dx.doi.org/10.3208/sandf.40.2_61.
Chełminski, Krzysztof, Dietmar Hömberg, and Oliver Rott. "On a thermomechanical milling model." Nonlinear Analysis: Real World Applications 12, no. 1 (February 2011): 615–32. http://dx.doi.org/10.1016/j.nonrwa.2010.07.005.
Calov, R., and I. Marsiat. "Simulations of the Northern Hemisphere through the last Glacial-interglacial cycle with a vertically integrated and a three-dimensional thermomechanical ice-sheet model coupled to a climate model." Annals of Glaciology 27 (1998): 169–76. http://dx.doi.org/10.3189/1998aog27-1-169-176.
We present simulations of the Northern Hemisphere land ice through the last glacial-interglacial cycle with a vertically integrated ice-sheet model and a three-dimensional thermomechanical ice-sheet model. Both models are coupled asynchronously to the zonally averaged Louvain-la-Neuve climate model, which includes simplified treatments of the atmosphere, ocean and sea ice. The two-dimensional vertically integrated ice-sheet model, which contains no thermomechanical coupling, was developed in spherical coordinates (Marsiat, 1994). The three-dimensional thermomechanical ice-sheet model was developed using the two-dimensional vertically integrated model as source. We compare results of the vertically integrated with those of the thermomechanical ice-sheet model. in the thermomechanical model the deformation properties of ice depend on the temperature within the ice and the enhancement factor; the latter is introduced to model, in a simplified approach, the different flow properties of Pleistocene and Holocene ice due to varying dust content. The computations with the thermomechanical model show that the growth and decay of the Northern Hemisphere ice sheets can be modelled with a common enhancement factor for all ice sheets. It is shown that there are model set-ups for the thermomechanical model yielding temporal developments of the total ice volume comparable to those of the vertically integrated model. Furthermore, we demonstrate that for the coupled climate/cryosphere system the total ice volume depends considerably on the enhancement factor.
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Wang, Jun, Weihong Zhang, Jihong Zhu, Yingjie Xu, Xiaojun Gu, and Ziad Moumni. "Finite element simulation of thermomechanical training on functional stability of shape memory alloy wave spring actuator." Journal of Intelligent Material Systems and Structures 30, no. 8 (March 21, 2019): 1239–51. http://dx.doi.org/10.1177/1045389x19831356.
Pre-service thermomechanical training is of great significance to achieve functional stability for shape memory alloy device. This article presents a finite element simulation of the training behavior of a shape memory alloy wave spring actuator using a thermomechanically coupled and finite-strain shape memory alloy model (Wang et al., 2017a). The model is implemented into ABAQUS/Explicit by means of a user-defined material subroutine VUMAT. The introduction of a finite-Hencky-strain return-mapping integration scheme substantially improves the numerical efficiency and stability. Model predictions are validated against the experimental data. The good agreement between both demonstrates the capabilities of the model of well describing the training behavior of shape memory alloy when subjected to large cyclic thermomechanical loading. Simulation results illustrate several primary thermomechanical characteristics during training process, such as the expansion of the phase transformation zone, the accumulation of the residual deformation, and the concentration of the internal stress. The present finite element approach provides a powerful tool in design and optimization of shape memory alloy wave spring actuator, especially to improve the geometric precision and to enhance the two-way shape memory effect.
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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.
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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Cui, Yu Jun, Nabil Sultan, and Pierre Delage. "A thermomechanical model for saturated clays." Canadian Geotechnical Journal 37, no. 3 (June 1, 2000): 607–20. http://dx.doi.org/10.1139/t99-111.
A thermomechanical model for saturated clays is proposed within the framework of recent extensions of the Cam-Clay model. The results of some tests found in the literature are analyzed, and the main features of the thermomechanical behaviour of clays are identified. The effect of the overconsolidation ratio (OCR) on the volume change of a soil (expansion-contraction) submitted to heating is well established using experimental data obtained for selected soils by various authors. However, existing models need to be modified to correctly model this feature. For this reason, a new volumetric thermal plastic mechanism is developed that allows for the prediction of plastic strains at higher OCR values. The overconsolidation effect observed when heating a normally consolidated soil is also modelled. Particular attention is paid to the coupling and hardening phenomena related to the combined effects of stress and temperature. A qualitative validation is made by examining the response of the model under a given thermomechanical path. Comparison with existing thermomechanical experimental results shows that the model can provide satisfactory predictions.Key words: clays, constitutive modelling, temperature effects, deformation, elastoplasticity, radioactive waste disposal.
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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.
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.
This dissertation work focuses on the thermomechanical behaviors of two recent exciting developments in active polymers: shape memory (SM) effects and covalent adaptive network polymers with bond exchange reactions. Both polymers are active in performing prescribed functions when an external stimulus is applied. The goals of the studies are to understand complex thermomechanical behaviors of such smart polymers through experiments, develop constitutive models to describe the behaviors, and use the developed models to assist their development and engineering applications. For the polymer SM effect, we use a multi-branched constitutive model to study the SM effect achieved by polymer glass transition. The major finding of our study is that the “Reduced Time” is identified to be the unique parameter to determine the polymer shape fixity and recovery ratio under different thermo-temporal conditions in an SM cycle. Based on the theoretical knowledge, we also study the energy releasing mechanism within shape memory polymers (SMPs), multi-shape memory effects, as well as the SM properties in various composite systems, such as magnetic particles, carbon black and microvascular reinforced SMP composites. For the covalent adaptive network polymers, we adopt the emerging covalent chemistry BERs to achieve a malleable, reparable, recyclable and yet insoluble thermoset network. After being pulverized into micro-size, and then compressed either at high temperature or just facilitated by the moisture, the polymer powder could be welded on the interfaces, and assembled together into a new sample with comparable mechanical properties to the fresh sample. Theoretical models are developed to gain fundamental understanding of how the processing conditions can affect the quality of reprocessed materials. A molecular model is developed to understand welding kinetics at the interface. Such understanding is then used to develop a multiple length scale interfacial constitutive model, which can be implemented in to finite element simulation software to assist computational study of reprocessing process.
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Cowan, Richard Scott. "Development of tribological design strategies based on a thermomechanical wear transition model." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17976.
Karl, Justin. "Thermomechanical Fatigue Life Prediction of Notched 304 Stainless Steel." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5796.
The behavior of materials as they are subjected to combined thermal and mechanical fatigue loads is an area of research that carries great significance in a number of engineering applications. Power generation, petrochemical, and aerospace industries operate machinery with expensive components that undergo repeated applications of force while simultaneously being exposed to variable temperature working fluids. A case of considerable importance is found in steam turbines, which subject blades to cyclic loads from rotation as well as the passing of heated gases. The complex strain and temperature histories from this type of operation, combined with the geometric profile of the blades, make accurate prediction of service life for such components challenging. Development of a deterministic life prediction model backed by physical data would allow design and operation of turbines with higher efficiency and greater regard for reliability. The majority of thermomechanical fatigue (TMF) life prediction modeling research attempts to correlate basic material property data with simplistic strain and thermal histories. With the exception of very limited cases, these types of efforts have been insufficient and imprecise in their capabilities. Early researchers did not account for the multiple damage mechanisms that operate and interact within a material during TMF loads, and did not adequately address the extent of the relationship between smooth and notched parts. More recent research that adequately recognizes the multivariate nature of TMF develops models that handle life reduction through summation of constitutive damage terms. It is feasible that a modification to the damage-based approach can sufficiently include cases that involve complex geometry. The focus of this research is to construct an experimentally-backed extension of the damage-based approach that improves handling of geometric discontinuities. Smooth and notched specimens of Type 304 stainless steel were subjected to several types of idealized fatigue conditions to assemble a clear picture of the types of damage occurring in a steam turbine and similarly-loaded mechanical systems. These results were compared with a number of idealized TMF experiments, and supplemented by numerical simulation and microscopic observation. A non-uniform damage-summation constitutive model was developed primarily based on physical observations. An additional simplistic model was developed based on phenomenological effect. Findings from this study will be applicable to life prediction efforts in other similar material and load cases. Ph.D. Doctorate Mechanical and Aerospace Engineering Engineering and Computer Science Mechanical Engineering
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Brindley, Kyle A. "Thermomechanical fatigue of Mar-M247: extension of a unified constitutive and life model to higher temperatures." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51852.
The goal of this work is to establish a life prediction methodology for thermomechanical loading of the Ni-base superalloy Mar-M247 over a larger temperature range than previous work. The work presented in this thesis extends the predictive capability of the Sehitoglu-Boismier unified thermo-viscoplasticity constitutive model and thermomechanical life model from a maximum temperature of 871C to a maximum temperature of 1038C. The constitutive model, which is suitable for predicting stress-strain history under thermomechanical loading, is adapted and calibrated using the response from isothermal cyclic experiments conducted at temperatures from 500C to 1038C at different strain rates with and without dwells. In the constitutive model, the flow rule function and parameters as well as the temperature dependence of the evolution equation for kinematic hardening are established. In the elevated temperature regime, creep and stress relaxation are critical behaviors captured by the constitutive model. The life model accounts for fatigue, creep, and environmental-fatigue damage under both isothermal and thermomechanical fatigue. At elevated temperatures, the damage terms must be calibrated to account for thermally activated damage mechanisms which change with increasing temperature. At lower temperatures and higher strain rates, fatigue damage dominates life prediction, while at higher temperatures and slower strain rates, environmental-fatigue and creep damage dominate life prediction. Under thermomechanical loading, both environmental-fatigue and creep damage depend strongly on the relative phasing of the thermal and mechanical strain rates, with environmental-fatigue damage dominating during out-of-phase thermomechanical loading and creep damage dominating in-phase thermomechanical loading. The coarse-grained polycrystalline microstructure of the alloy studied causes a significant variation in the elastic response, which can be linked to the crystallographic orientation of the large grains. This variation in the elastic response presents difficulties for both the constitutive and life models, which depend upon the assumption of an isotropic material. The extreme effects of a large grained microstructure on the life predictions is demonstrated, and a suitable modeling framework is proposed to account for these effects in future work.
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Kern, Daniela Stefanie [Verfasser], and Dietmar [Akademischer Betreuer] Hömberg. "Analysis and numerics for a thermomechanical phase transition model in steel / Daniela Stefanie Kern. Betreuer: Dietmar Hömberg." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2011. http://d-nb.info/1014946247/34.
Bradford, Simon. "The development, benchmarking and application of a three dimensional thermomechanical finite volume model of ice sheet flow." Thesis, University of Bristol, 2003. http://hdl.handle.net/1983/6ba27dfa-dfe7-4846-a3e3-b43a77604849.
Nain, Vaibhav. "Efficient thermomechanical modeling of large parts fabricated by Directed Energy Deposition Additive Manufacturing processes." Thesis, Lorient, 2022. http://www.theses.fr/2022LORIS630.
Les procédés de fabrication additive laser par dépôt de poudre offrent une opportunité unique pour la fabrication de grandes pièces à géométrie complexe. Cependant, les déformations mécaniques induites par ces procédés entrainent des défauts pouvant conduire à des pièces rebutées. Au cours de cette thèse, différents modèles ont donc été développés pour mieux comprendre l’apparition de ces déformations en fonction des paramètres opératoires. Un premier modèle thermomécanique prédit le comportement élastoplastique lors de la construction d’un mur en acier inoxydable 316L. L’apport de chaleur est modélisé par une source double ellipsoïdale mobile et la construction des couches se fait à l’aide d’une méthode hybride « Quiet/Active élément ». Un écrouissage isotrope non linéaire est considéré, avec prise en compte de la restauration d’écrouissage à hautes températures. Afin de réduire drastiquement les temps de calcul, une nouvelle source de chaleur est proposée utilisant une source ellipsoïdale allongée qui moyenne l’énergie sur un intervalle d’espace et de temps. Cependant, un intervalle d’espace trop grand diminue la précision du modèle. De nouveaux paramètres sont alors introduits afin d’identifier le meilleur compromis entre temps de calcul et précision. L’ensemble des modèles proposés est confronté avec succès avec des données expérimentales en termes de température et déplacement et ce pour différents paramètres opératoires. Enfin, des modèles multi-échelles basés l’activation par couche ou les méthodes de déformations inhérentes sont étudiés en vue de réduire les temps de calcul Directed Energy Deposition (DED) Additive Manufacturing technology offers a unique possibility of fabricating large-scale complex-shape parts. However, process-induced deformation in the fabricated part is still a big obstacle in successfully fabricating large-scale parts. Therefore, multiple numerical models have been developed to understand the accumulation of induced deformation in the fabricated part. The first model predicts the thermo-elastoplastic behaviour that captures the laser movement. The laser-material interaction and metal deposition are modeled by employing a double ellipsoid heat source and the Quiet/Active material activation method respectively. The model considers isotropic non-linear material hardening to represent actual metal behaviour. It also employs an instantaneous stress relaxation model to simulate the effects of physical phenomena like annealing, solid-state phase transformation, and melting. Using this model as a reference case, an efficient model is developed with an objective to reduce the computation time and make it feasible to simulate large-part. The model employs an Elongated Ellipsoid heat source that averages the heat source over the laser path which reduces the computational burden drastically. However, averaging over large laser path results in inaccurate results. Therefore, new parameters are developed that identify the best compromise between computation time reduction and accuracy. Both models are validated with experimental data obtained from several experiments with different process parameters. Finally, other Multi- scale methods such as the Layer-by-layer method and Inherent Strain-based methods are implemented and explored
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Elahinia, Mohammad. "Effect of System Dynamics on Shape Memory Alloy Behavior and Control." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11221.
While the existing thermomechanical constitutive models can predict the behavior of SMA-actuated systems in most cases, in this study, we have shown that there are certain situations in which these models are not able to predict the behavior of SMAs. To this end, a rotary SMA-actuated robotic arm is modeled using the existing constitutive models. The model is verified against the experimental results to document that under certain conditions, the model is not able to predict the behavior of the SMA-actuated manipulator. Such cases most often occur when the temperature and stress of the SMA wire change simultaneously. The constitutive model discrepancy is also studied experimentally using a dead-weight that is actuated by an SMA wire. Subsequently, an enhanced phenomenological model is developed. The enhanced model is able to predict the behavior of SMAs under complex thermomechanical loadings. For the SMA-actuated robotic arm, several control methods are designed through simulations. A position-based PID controller is designed first, and it is found that this controller cannot perform well for all the desired angular positions(set-points). A Variable Structure Control (VSC) based on the angular position and velocity is presented that has a relatively better erformance for all the set-points. To improve the erformance of the VSC, in terms of the steady state error, an Extended Kalman Filter is designed and used to modify the VSC design. The modified VSC is based on the angular position and angular velocity of the actuator and the estimated temperature of the SMA wire. Furthermore, a Sliding Mode Controller is designed based on the stress of the SMA wire. Finally, a model-based Backstepping Controller is designed for the SMA-actuated arm. This model-bsed controller allows designing the controller parameters based on the parameters of the system. Additionally, the stability of the controller is studied. Using the Lyapunov stability analysis, it is shown that the model-based Backstepping Controller is able to asymptotically stabilize the system. Ph. D.
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Mathiesen, Danielle Samone. "Experiments, Constitutive Modeling, and Multi-Scale Simulations of Large Strain Thermomechanical Behavior of Poly(methyl methacrylate) (PMMA)." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1415694651.
Radhakrishnan, V. Application of an energy-based life prediction model to bithermal and thermomechanical fatigue. [Washington, DC]: National Aeronautics and Space Administration, 1994.
Radhakrishnan, V. Application of an energy-based life prediction model to bithermal and thermomechanical fatigue. [Washington, DC]: National Aeronautics and Space Administration, 1994.
Bal, B., and K. Ghosh. "A Thermomechanical Model of Earthquakes." In Modelling Critical and Catastrophic Phenomena in Geoscience, 491–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-35375-5_18.
Bensalah, M. O., L. Boulmane, and A. Hihi. "Thermomechanical Behaviour of Shape Memory Alloy Taylor’s Model." In Solid Mechanics and Its Applications, 359–66. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-017-0483-0_44.
Barfusz, Oliver, Felix Hötte, Stefanie Reese, and Matthias Haupt. "Pseudo-transient 3D Conjugate Heat Transfer Simulation and Lifetime Prediction of a Rocket Combustion Chamber." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 265–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_17.
Abstract Rocket engine nozzle structures typically fail after a few engine cycles due to the extreme thermomechanical loading near the nozzle throat. In order to obtain an accurate lifetime prediction and to increase the lifetime, a detailed understanding of the thermomechanical behavior and the acting loads is indispensable. The first part is devoted to a thermally coupled simulation (conjugate heat transfer) of a fatigue experiment. The simulation contains a thermal FEM model of the fatigue specimen structure, RANS simulations of nine cooling channel flows and a Flamelet-based RANS simulation of the hot gas flow. A pseudo-transient, implicit Dirichlet–Neumann scheme is utilized for the partitioned coupling. A comparison with the experiment shows a good agreement between the nodal temperatures and their corresponding thermocouple measurements. The second part consists of the lifetime prediction of the fatigue experiment utilizing a sequentially coupled thermomechanical analysis scheme. First, a transient thermal analysis is carried out to obtain the temperature field within the fatigue specimen. Afterwards, the computed temperature serves as input for a series of quasi-static mechanical analyses, in which a viscoplastic damage model is utilized. The evolution and progression of the damage variable within the regions of interest are thoroughly discussed. A comparison between simulation and experiment shows that the results are in good agreement. The crucial failure mode (doghouse effect) is captured very well.
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Koeune, R., and Jean Philippe Ponthot. "A One Phase Thermomechanical Model for Semi-Solid Thixoforming." In Solid State Phenomena, 629–35. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.629.
Saint-Sulpice, Luc, Shabnam Arbab Chirani, and Sylvain Calloch. "A Cyclic Model for Thermomechanical Behavior of Shape Memory Alloys." In ICOMAT, 473–80. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118803592.ch68.
Lee, Keum Oh, Seong Gu Hong, and Soon Bok Lee. "A Novel Description of Thermomechanical Behavior Using a Rheological Model." In Fracture and Strength of Solids VI, 205–10. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.205.
Bolotnik, Nikolay, Vladislav Chashchukhin, Valery Gradetsky, Dmitry Kozlov, Armen Nunuparov, Igor Smirnov, and Andrei Zhukov. "Thermomechanical Actuator for Micro-robotic Systems: A Model and Parameter Estimation." In ROMANSY 22 – Robot Design, Dynamics and Control, 340–46. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78963-7_43.
Wang, Linxiang, and Roderick V. N. Melnik. "Simulation of Nonlinear Thermomechanical Waves with an Empirical Low Dimensional Model." In Lecture Notes in Computer Science, 884–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11428831_110.
Poths, R. M., W. Mark Rainforth, and E. J. Palmiere. "Strain Induced Precipitation in Model and Conventional Microalloyed Steels during Thermomechanical Processing." In Materials Science Forum, 139–46. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-981-4.139.
Тези доповідей конференцій з теми "Thermomechanical model":
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Chen, Hailong, Yile Hu, and Benjamin W. Spencer. "A MOOSE-Based Implicit Peridynamic Thermomechanical Model." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65552.
In this paper, we present an implicit formulation of peridynamic theory for coupled thermomechanical problem based on the Multiphysics Object-Oriented Simulation Environment (MOOSE) framework, with special application to the simulation of fracture behavior of nuclear fuels at high temperature. First, the coupled peridynamic thermomechanical model is briefly reviewed. Next, an implicit formulation for the solution of static or quasi-static problems is proposed. Finally, the formulation is verified against benchmark solutions for both elasticity and heat conduction problems. The nuclear fuel fracture problems is modeled using the proposed implicit scheme. The mesh dependencies of crack initiation are also investigated.
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Kurath, Peter, and Jason Howard Jones. "Multiaxial Thermomechanical Deformation Utilizing a Non-Unified Plasticity Model." In SAE 2000 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-0782.
Azadi, B., R. K. N. D. Rajapakse, and D. M. Maijer. "Multi-dimensional thermomechanical model for pseudoelastic response of SMA." In Smart Structures and Materials, edited by Douglas K. Lindner. SPIE, 2006. http://dx.doi.org/10.1117/12.658552.
Naito, Hisashi, Yuji Matsuzaki, and Tadashige Ikeda. "Unified model of thermomechanical behavior of shape memory alloys." In SPIE's 8th Annual International Symposium on Smart Structures and Materials, edited by Christopher S. Lynch. SPIE, 2001. http://dx.doi.org/10.1117/12.432768.
Farjami, S., and E. Nikitenko. "A Thermomechanical-Microstructural Model of a Hot Strip Mill." In AISTech 2021. AIST, 2021. http://dx.doi.org/10.33313/382/155-11111-088.
Farjami, S., and E. Nikitenko. "A Thermomechanical-Microstructural Model of a Hot Strip Mill." In AISTech 2021. AIST, 2021. http://dx.doi.org/10.33313/382/055.
Bianco, Vincenzo, Giorgio Monti, and Nicola Belfiore. "COMPLETE ANALYTICAL THERMOMECHANICAL MODEL OF DOUBLE FRICTION PENDULUM DEVICES." In 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2017. http://dx.doi.org/10.7712/120117.5521.18268.
Xu, Lijun, and Jamil A. Khan. "Thermomechanical Model of Spot Welding for Calculating Residual Stresses." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47502.
A comprehensive axisymmetric model of the coupled thermal-electrical-mechanical analysis predicting weld nugget development and residual stresses for the resistance spot welding process of Al-alloys is developed. The model estimates the heat generation at the faying surface, the workpiece-electrode interface, and the Joule heating of the workpiece and electrode. The phase change due to melting in the weld pool is considered. The contact area and its pressure distribution at both the faying surface and the electrode-workpiece interface are determined from a coupled thermal-mechanical model using a finite element method. The knowledge of the interface pressure provides accurate prediction of the interfacial heat generation. For the numerical model, temperature dependent thermal, electrical and mechanical properties are used. The proposed model can successfidly calculate the nugget diameter and thickness, and predict the residual stresses and the elastic-plastic deformation history. The calculated nugget shape and the deformation of sheets based on the model are compared with the experimental data. The computed residual stresses approach the distribution of experimental measurement of the residual stress.
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Rogers, James W., Thomas J. Mackin, and Leslie M. Phinney. "A Thermomechanical Model for Adhesion Reduction of MEMS Microcantilevers." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/mems-23823.
Abstract We present a model for reducing adhesion in MEMS structures using laser heating and compare the model to experimental results. Using a fracture mechanics model, the interface between the stiction-failed microcantilever and the substrate is treated as a crack, and the energy release rate is calculated using elastic theory. In order to include the effect of laser irradiation of the microcantilevers, an associated thermal strain energy is included in the fracture model. As the beam peels, the free length reaches a critical value where the beam buckles, decreasing the energy of the system. The results of the model predict a temperature difference of 100 K is able to repair microcantilevers as long as 600 μm. Experiments are performed that demonstrate the peeling of stiction-failed beams from the substrate after laser irradiation as predicted by the thermomechanical model.
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Yamashita, Hiroki, Rohit Arora, Hiroyuki Kanazawa, and Hiroyuki Sugiyama. "Development of Reduced Order Thermomechanical Model Using Floating Frame of Reference Formulation." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67317.
In this paper, a reduced order thermomechanical model based on the Craig-Bampton component mode synthesis method is extended to the floating frame of reference formulation for the thermomechanical analysis of flexible multibody systems. To this end, coupled structural and thermal equations of finite element models are partitioned in terms of the internal and interface coordinates, each of which consists of the structural and thermal coordinates. Both deformation including the thermal effect and temperature in the internal region are then defined by a linear combination of the thermomechanical fixed-interface normal modes and thermomechanical constraint modes to account for structural and thermal modes associated with external forces and heat sources applied to the system. The final form of equations include equations of motion associated with a flexible body that incorporates thermal deformation and the reduced order heat equations that describe the transient change in the temperature over the flexible body. For this reason, the inertia coupling of the reference motion and the thermal deformation is automatically considered using the floating frame of reference formulation. Both equations are integrated forward in time simultaneously using general multibody dynamics computer algorithms to account for the coupled structural and thermal behavior of flexible multibody systems. Several numerical examples are presented to demonstrate the use of the numerical procedure developed in this study.
Звіти організацій з теми "Thermomechanical model":
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Allen, D. H., and W. E. Haisler. A Model for Predicting Thermomechanical Response of Large Space Structures. Fort Belvoir, VA: Defense Technical Information Center, June 1985. http://dx.doi.org/10.21236/ada162139.
Allen, D. H., and W. E. Haisler. A Model for Predicting Thermomechanical Response of Large Space Structures. Fort Belvoir, VA: Defense Technical Information Center, July 1986. http://dx.doi.org/10.21236/ada172966.
Hodge, N., R. Ferencz, and J. Solberg. Implementation of a Thermomechanical Model in Diablo for the Simulation of Selective Laser Melting. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1108835.
PETER-BORIE, Mariane, Arnold BLAISONNEAU, Sylvie GENTIER, Xavier RACHEZ, Wenjie SHIU, and Fabian DEDECKER. A particulate rock model to simulate thermomechanical cracks induced in the near well by supercritical CO2 injection. Cogeo@oeaw-giscience, September 2011. http://dx.doi.org/10.5242/iamg.2011.0148.
Coffin, D. W. Development and pilot testing of modular dynamic thermomechanical pulp mill model to develop energy reduction strategies. Final report. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/454011.
Costin, L. S., and E. P. Chen. An analysis of the G-Tunnel heated block thermomechanical response using a compliant-joint rock-mass model; Yucca Mountain Project. Office of Scientific and Technical Information (OSTI), December 1988. http://dx.doi.org/10.2172/137504.
