Готові списки джерел за темами / Metallo-thermomechanical finite element model

Добірка наукової літератури з теми "Metallo-thermomechanical finite element model"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Metallo-thermomechanical finite element model"

Das, S., Eric J. Palmiere, and I. C. Howard. "Modelling Recrystallisation during Thermomechanical Processing Using CAFE." Materials Science Forum 467-470 (October 2004): 623–28. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.623.

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A common feature that stimulates modelling efforts across the various physical sciences is that complex microscopic behaviour underlies apparently simple macroscopic effects. Mathematical formulations attempt to capture the initial and evolving microstructural entities either implicitly or explicitly and link their effects to measurable macroscopic variables such as load or stress by averaging out any microscopic fluctuations. The implicit formulations that ignore the inherent spatial heterogeneity in the deforming domain form the basis of constitutive models for input to finite element (FE) systems. On the other hand, explicit formulations to capture and link microstructural entities rely on narrowing down the size of each finite element, thereby increasing the number of finite elements in the deforming domain, an effect accompanied by a rapid growth in computational time. The model described here, Cellular Automata based Finite Elements (CAFE), utilises the Cellular Automata technique to represent initial and evolving microstructural features (e.g., dislocation densities, grain sizes, etc.) in C-Mn steels at an appropriate length scale by linking the macro-scale process variables obtained using an overlying finite element mesh. Differences will be illustrated between single and two-pass hot rolling experiments.

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Burlayenko, Vyacheslav N. "Modelling Thermal Shock in Functionally Graded Plates with Finite Element Method." Advances in Materials Science and Engineering 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/7514638.

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Thermomechanical behavior and crack propagation in a functionally graded metal/ceramic plate undergoing thermal shock are analyzed by using the finite element method. A two-dimensional plane strain functionally graded finite element has been developed within the ABAQUS software environment for this purpose. An actual material gradation has been accomplished by sampling material quantities directly at the Gauss points of the element via programming appropriate user-defined subroutines. The virtual crack closure technique is used to model a crack growth under thermal loading. Contact possible between crack lips during the crack advance is taken into account in thermomechanical simulations as well. The paper shows that the presented finite element model can be applied to provide an insight into the thermomechanical respond and failure of the metal/ceramic plate.

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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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Wriggers, P., and C. Miehe. "Contact constraints within coupled thermomechanical analysis—A finite element model." Computer Methods in Applied Mechanics and Engineering 113, no. 3-4 (March 1994): 301–19. http://dx.doi.org/10.1016/0045-7825(94)90051-5.

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Rakotomalala, R., P. Joyot, and M. Touratier. "Arbitrary Lagrangian-Eulerian thermomechanical finite-element model of material cutting." Communications in Numerical Methods in Engineering 9, no. 12 (December 1993): 975–87. http://dx.doi.org/10.1002/cnm.1640091205.

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Zivkovic, Dragoljub, Dragan Milcic, Milan Banic, and Pedja Milosavljevic. "Thermomechanical finite element analysis of hot water boiler structure." Thermal Science 16, suppl. 2 (2012): 387–98. http://dx.doi.org/10.2298/tsci120503177z.

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The paper presents an application of the Finite Elements Method for stress and strain analysis of the hot water boiler structure. The aim of the research was to investigate the influence of the boiler scale on the thermal stresses and strains of the structure of hot water boilers. Results show that maximum thermal stresses appear in the zone of the pipe carrying wall of the first reversing chamber. This indicates that the most critical part of the boiler are weld spots of the smoke pipes and pipe carrying plate, which in the case of significant scale deposits can lead to cracks in the welds and water leakage from the boiler. The nonlinear effects were taken into account by defining the bilinear isotropic hardening model for all boiler elements. Temperature dependency was defined for all relevant material properties, i. e. isotropic coefficient of thermal expansion, Young?s modulus, and isotropic thermal conductivity. The verification of the FEA model was performed by comparing the measured deformations of the hot water boiler with the simulation results. As a reference object, a Viessmann - Vitomax 200 HW boiler was used, with the installed power of 18.2 MW. CAD modeling was done within the Autodesk Inventor, and stress and strain analysis was performed in the ANSYS Software.

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Bergman, G., and M. Oldenburg. "A finite element model for thermomechanical analysis of sheet metal forming." International Journal for Numerical Methods in Engineering 59, no. 9 (February 3, 2004): 1167–86. http://dx.doi.org/10.1002/nme.911.

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Fu, C., D. L. McDowell, and I. C. Ume. "A Finite Element Procedure of a Cyclic Thermoviscoplasticity Model for Solder and Copper Interconnects." Journal of Electronic Packaging 120, no. 1 (March 1, 1998): 24–34. http://dx.doi.org/10.1115/1.2792281.

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A finite element procedure using a semi-implicit time-integration scheme has been developed for a cyclic thermoviscoplastic constitutive model for Pb-Sn solder and OFHC copper, two common metallic constituents in electronic packaging applications. The scheme has been implemented in the commercial finite element (FE) code ABAQUS (1995) via the user-defined material subroutine, UMAT. Several single-element simulations are conducted to compare with previous test results, which include monotonic tensile tests, creep tests, and a two-step ratchetting test for 62Sn36Pb2Ag solder; a nonproportional axial-torsional test and a thermomechanical fatigue (TMF) test for OFHC copper. At the constitutive level, we also provide an adaptive time stepping algorithm, which can be used to improve the overall computation efficiency and accuracy especially in large-scale FE analyses. We also compare the computational efforts of fully backward Euler and the proposed methods. The implementation of the FE procedure provides a guideline to apply user-defined material constitutive relations in FE analyses and to perform more sophisticated thermomechanical simulations. Such work can facilitate enhanced understanding thermomechanical reliability issue of solder and copper interconnects in electronic packaging applications.

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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.

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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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Lagoudas, D. C., J. G. Boyd, and Z. Bo. "Micromechanics of Active Composites With SMA Fibers." Journal of Engineering Materials and Technology 116, no. 3 (July 1, 1994): 337–47. http://dx.doi.org/10.1115/1.2904297.

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The study of the effective thermomechanical response of active fibrous composites with shape memory alloy (SMA) fibers is the subject of this work. A 3-D constitutive response for the SMA fibers is formulated first. To model thermomechanical loading path dependence, an incremental approach is used assuming that within each stress and temperature increment the volume fraction of the martensitic phase remains constant in the SMA fibers. The Mori-Tanaka averaging scheme is then used to give an estimate of the instantaneous effective thermomechanical properties in terms of the thermomechanical properties of the two phases and martensitic volume fraction. A unit cell model for a periodic active composite with cubic and hexagonal arrangement of fibers is also developed to study the effective properties using finite element analysis. It is found that since the fibers and not the matrix undergo the martensitic phase transformation that induces eigenstrains, the Mori-Tanaka averaging scheme accurately models the thermomechanical response of the composite, relative to the finite element analysis, for different loading paths. Specific results are reported for the composite pseudoelastic and shape memory effect for an elastomeric matrix continuous SMA fiber composite.

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Дисертації з теми "Metallo-thermomechanical finite element model"

Zhang, Yang. "Etude des conséquences mécaniques de la transformation de phase dans les réfractaires électrofondus à très haute teneur en zircone." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM035/document.

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Les réfractaires électrofondus, qui constituent l’objet de ce travail, appartiennent au système alumine-zircone-silice. Ils sont obtenus par coulée dans des moules à des températures supérieures à 2000°C, rendant très difficile toute instrumentation. De nombreux phénomènes intrinsèques au matériau interviennent lors du refroidissement qui suit la coulée. Parmi ces derniers, cette recherche a essentiellement porté sur la transformation de phase (de tétragonale à monoclinique) de la zircone et aux phénomènes associés (gonflement, plasticité,…).A partir d’essais mécaniques à haute température réalisés en laboratoire, les lois de comportements thermiques et mécaniques ont été caractérisées et modélisées en cours de transformation de la zircone. La plasticité à très bas seuil de contrainte observée a, en particulier, été décrite par une vitesse de déformation dérivée du modèle de Leblond, une fonction de rendement de type Cam-clay sans consolidation et une fonction de rendement définissant l’avancement de la transformation en fonction de la température. Après implémentation dans un code de calcul par éléments finis et validation par confrontation avec des résultats d’essais sous contraintes multiaxiales, ce modèle a été assemblé aux autres composantes du comportement mécanique (fluage, élasticité,…), pour décrire l’ensemble des phénomènes thermomécaniques observés lors du refroidissement.Parallèlement, des coulées de blocs en laboratoire, instrumentées par des thermocouples et des capteurs d’émission acoustique, ont permis de reconstruire par simulation numérique l’évolution du champ de température à l’intérieur de la dalle au cours du refroidissement. L’enthalpie de solidification et celle associée à la transformation de phase, préalablement quantifiée par ATD, ont été prises en compte. L’application du modèle mécanique complet, associant toutes les composantes du comportement, a permis de calculer l’évolution du champ de contraintes généré par les gradients thermiques en fonction du temps et, en particulier, de mettre en évidence le rôle essentiel joué par la transformation de phase sur la relaxation des contraintes
Fused-cast refractories, which are concerned by this work, belong to the alumina-zirconia-silica system. They are obtained by casting in molds at temperatures higher than 2000°C, that make very difficult any instrumentation. Many phenomena intrinsic to the material occur during cooling-down after casting. Among these latter, this research essentially focused on the phase transformation (from tetragonal to monoclinic) of zirconia and the associated phenomena (swelling, plasticity,...).From high temperature mechanical tests performed in laboratory, the thermal and mechanical behavior laws were characterized and modeled during the zirconia transformation. Plasticity at very low stress threshold was observed. A Leblond type model has been extended by introducing a Cam-clay yield function without consolidation. In this model, the progress of the transformation is controlled by the evolution of the temperature. This model was complemented by other components of the mechanical behavior (creep, elasticity, ...). It has been validated by experimental tests under multiaxial loadings that replicate the main thermomechanical phenomena observed during cooling.In parallel, blocks casted in laboratory conditions, instrumented with thermocouples and acoustic emission sensors, allowed a numerical simulation of the change in temperature field within the block during cooling-down. This simulation took into account the solidification enthalpy and the enthalpy associated to the phase transformation, previously quantified by DTA. The implementation of the complete mechanical model integrating all the behavior components led to a calculation of the stress field changes generated by thermal gradients as a function of time and, in particular, to highlight the essential role played by the phase transformation on stress relaxation

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Basaran, Cemalettin. "Finite element thermomechanical analysis of electronic packaging problems using disturbed state constitutive models." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186961.

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In this dissertation a finite element procedure using the Disturbed State Concept constitutive models is proposed for the thermomechanical analysis of electronics packaging problems. First, microelectronics packaging types and the problems facing the electronics industry are discussed. Next, the literature in the field of constitutive models and the finite element procedures available for microelectronics packaging materials and interfaces is reviewed. The previous formulation of the Disturbed State Concept is modified so that different stresses and different strains are allowed in the intact and the fully adjusted parts of the material. Furthermore, the thermo elasto-viscoplastic with disturbance constitutive model is improved to handle the continuous temperature change and the hold time. These last features enhance the model so that it can be used in a finite element code to simulate the behavior of the microelectronics packaging materials and interfaces in temperature cycling. A new finite element procedure is developed to implement the improved Disturbed State Concept formulation. The finite element procedure includes a wide range of material models, starting from the linear elastic to thermo elasto-viscoplastic with disturbance. In order to eliminate the finite element mesh sensitivity encountered in strain-softening materials, a new procedure is proposed. The Disturbed State Average Strain method reduces or eliminates the finite element mesh sensitivity. This is proved through a number of example problems. The proposed finite element procedure is verified against a number of sets of experimental data obtained from the literature.

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Rolseth, Anton, and Anton Gustafsson. "Implementation of thermomechanical laser welding simulation : Predicting displacements of fusing A AISI304 T-JOINT." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-19946.

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Laser welding is an advanced joining technique with the capability to form deep, narrow, and precise welds. Numerical models are used to simulate the process in attempts of predicting distortions and stresses in the material. This is done to reduce physical testing, optimize processes and enable integrated product- and process development. The Virtual Manufacturing Process research group at University of Skövde wishes to increase their knowledge on modeling options of thermomechanical simulations to grant local industries these benefits. A numerical model for the laser welding process was developed in ABAQUS. This was done by examining the macrograph structure of a simple weld and applied to a stainless-steel T-joint welding application. The macrograph data was used to calibrate a mathematical heat source model. User subroutine DFLUX was used to enable movement of the heat source and element activation was used to simulate the fusion of the two parts. A T-joint welding experiment was carried out to measure deflection and the result was compared to numerical simulations. Different combinations of heat source models, coupling type and element activation was compared in relation to predicting the deflection. Computational time and modeling complexity for the techniques was also considered.The results showed that a 3D Gaussian heat source model will imitate the keyhole weld achieved superior to the compared 2D model. The 3D model provides greater flexibility since it enables combinations of any geometrical bodies. It was shown that element activation has a significant contribution on part stiffness and thus resulting distortions. To implement element activation a fully coupled analysis is required. The deflection of the fully coupled 3D simulation with element activation showed a 9% deviance in deflection compared with experiments.

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Choi, Joonho. "Concurrent fire dynamic models and thermomechanical analysis of steel and concrete structures." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26679.

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Bargaoui, Hiba. "Simulation de la déformation des noyaux de fonderie durant la coulée." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM004/document.

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Les cavités intérieures des culasses d'aluminium sont réalisées à l'aide de noyaux de sable, qui sont constitués d'un mélange de silice et d'une résine Polyuréthane. Ils sont placés dans le moule métallique juste avant la coulée. Durant celle-ci, ils subissent la pression métallo-statique et sont soumis à des températures élevées. Sous ces conditions extrêmes, avec l'apparition de parois de plus en plus fines et de formes plus complexes, les noyaux peuvent présenter des déformations qui induisent des défauts dimensionnels sur les pièces finales.Pour contrôler la déformation des noyaux, il faut d'abord disposer d'une caractérisation robuste de leur propriétés thermiques et mécaniques, qui puisse être utilisée dans des calculs de structures simulant le flux de métal liquide, la solidification et les champs thermiques. Cette approche n'est pas encore pratiquée de façon complète dans l'industrie. Une revue de la littérature confirme que cette connaissance n'est que très parcellaire pour le moment.Le travail a donc d'abord été concentré sur la caractérisation expérimentale du comportement thermomécanique et des propriétés thermophysiques des noyaux de fonderie et du liant résine.Ensuite, un modèle de comportement capable de prendre en compte la viscosité du matériau, son endommagement, et surtout son évolution en fonction du temps et de la température en raison de la dégradation thermique du liant résine a été développé.Une éprouvette technologique a finalement été conçue et un protocole expérimental a été mis en place pour mesurer la déformation d'un noyau durant la coulée et de valider numériquement le modèle de comportement sous des chargements thermiques et mécaniques complexes
The inner cavities of aluminum cylinder heads are made using sand cores, which are made of silica sand and of a polyurethane resin binder. The cores are placed in the metallic mold just before casting. During this stage, the cores are submitted to the metallo-static pressure and high temperatures. Under these extreme loading conditions, with the development of thinner and thinner walls with complex designs, the cores exhibit significant deformation causing dimensional defects in the final cast.To control the deformation of the sand core, it is necessary to possess a robust characterization of their thermal and mechanical properties, that could be introduced in structural computations simulating the flow of the liquid metal, the solidification and the thermal fields. This approach is still not fully in use in the industry. A review of the literature confirms that this knowledge is incomplete for the moment.The work was therefore concentrated on the experimental characterization of the thermomechanical behavior and the thermophysical properties of the foundry cores and Polyurethane resin binder.Then, a behavior model capable of taking into account the viscosity of the material, damage development, and especially its evolution as a function of time and temperature because of the thermal degradation of the binder resin was developed.A technological specimen was finally designed and an experimental protocol has been established to measure the deformation of a core during casting and numerically validate the constitutive equations under complex thermal and mechanical loadings

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Книги з теми "Metallo-thermomechanical finite element model"

Dhondt, Guido. The Finite Element Method for Three-Dimensional Thermomechanical Applications. New York: John Wiley & Sons, Ltd., 2004.

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Dhondt, Guido. Finite Element Method for Three-Dimensional Thermomechanical Applications. Wiley & Sons, Incorporated, John, 2007.

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Dhondt, Guido. Finite Element Method for Three-Dimensional Thermomechanical Applications. Wiley & Sons, Limited, John, 2005.

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Dhondt, G., and Guido Dhondt. Finite Element Method for Three-Dimensional Thermomechanical Applications. Wiley & Sons, Incorporated, John, 2004.

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Dhondt, Guido. The Finite Element Method for Three-Dimensional Thermomechanical Applications. Wiley, 2004.

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Частини книг з теми "Metallo-thermomechanical finite element model"

Behnke, Ronny, and Michael Kaliske. "The Extended Non-affine Tube Model for Crosslinked Polymer Networks: Physical Basics, Implementation, and Application to Thermomechanical Finite Element Analyses." In Designing of Elastomer Nanocomposites: From Theory to Applications, 1–70. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/12_2016_9.

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de Oliveira, Wendell P., Marcelo A. Savi, Pedro M. C. L. Pacheco, and Luís F. G. de Souza. "Finite Element Analysis of the Thermomechanical Coupling in Quenching of Steel Cylinders Using a Constitutive Model with Diffusional Phase Transformations." In III European Conference on Computational Mechanics, 358. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-5370-3_358.

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Тези доповідей конференцій з теми "Metallo-thermomechanical finite element model"

Ghosh, S., and J. Choi. "Three-Dimensional Transient Finite Element Analysis for Microstructure Formation and Residual Stresses in Laser-Aided DMD Process." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56359.

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Despite immense advances in Laser-Aided Direct Material Deposition process, many issues concerning the adverse effects of process parameters on the stability of variety of properties and the integrity of microstructure have been reported. Macroscopic aspects are important in predicting macroscopic defects or optimizing process conditions, while microstructural features such as phase appearance, morphology, grain size, spacing, or micro-defects are certainly no less important in determining the ultimate properties of the solidified product. Traditional solidification theories as applied to castings or related processes are inappropriate in describing solidification in high-energy beam processes involving significantly greater cooling rates. Due to the complexity and nonlinearity of this process, analytical solutions can rarely address the practical manufacturing process. This paper is an attempt towards a methodology of finite element analysis for the prediction of solidification microstructure and macroscopic as well as microscopic thermal residual stresses in this process. The computer simulation which is based on metallo-thermomechanical theory and finite element analysis for coupled temperature, solidification, phase transformation and stress/strain fields can prove to be a very useful tool in predicting the material behavior and optimizing the process parameters to obtain the best material properties. This model would reduce long and cumbersome experimental routes to predict the material behavior under similar loading conditions.

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Lin, Baojiu, and David W. Nicholson. "Finite Element Analysis of Thermomechanical Contact of an Elastomeric O-Ring Seal." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-106.

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This study concerns the development of a finite element model to support design improvements in elastomeric seals subject to high temperature and pressure, such as in aircraft engines. Existing finite element codes familiar to the authors do not couple thermal and mechanical fields, nor do they implement thermomechanical contact models suitable for highly deformable materials. Recently, the authors have introduced a thermohyperelastic constitutive model for near-incompressible elastomers. In two subsequent studies, using the constitutive model, a method has been introduced for finite element analysis of coupled thermomechanical response, including boundary contributions due to large deformation and variable contact. A new thermomechanical contact model has also been introduced to accommodate the softness of elastomers. The method has been implemented in a special purpose code which concerns a seal compressed into a well. Several computations are used to validate the code. Simulations of a seal in an idealized geometry indicate rapid pressure increase with increasing compression and temperature.

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Richter, F., O. Kastner, and G. Eggeler. "Finite – element model for simulations of fully coupled thermomechanical processes in shape memory alloys." In ESOMAT 2009 - 8th European Symposium on Martensitic Transformations. Les Ulis, France: EDP Sciences, 2009. http://dx.doi.org/10.1051/esomat/200906029.

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Davoud, Mohammad S., and Xiaomin Deng. "Finite Element Modeling of GMAW Process: Evolution and Formation of Residual Stresses Upon Cooling." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59241.

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Fusion arc welding processes often generate substantial residual stresses, which may alter the performance of welded structures. Residual stresses are the results of incompatible elastic and plastic deformations in a body. Destructive techniques are generally used to experimentally determine residual stresses. Employment of these methods would not often be possible or practical in industry. In this study, three-dimensional (3D) and two-dimensional (2D) finite element simulations and experimental work have been performed to analyze the thermomechanical problem of GMAW and to obtain a full-field view of the residual stress field. One of the purposes of this study is to examine the formation of residual stresses upon cooling of a weldment. Comparisons of the results of 2D and 3D finite element models reveal many three-dimensional features in the thermomechanical problem of GMAW. The magnitude of longitudinal residual stresses obtained from the 2D model, however, compares well with the results obtained from the 3D model.

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Cho, H. K. "Finite Element Analysis on the Behavior of Laminated Composite Shells With Embedded Shape Memory Alloy Wires." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41860.

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Motivated by needs such as those in the aerospace industry, this paper demonstrates the thermomechanical characteristics of static and dynamic (frequency) behaviors of laminated composite shells with embedded shape memory alloy (SMA) wire subjected to temperature environments. Numerical analysis for SMA fiber reinforced composite laminates is performed by synergizing finite element method with Brison’s model [1,2] of SMA constitutive law. A nonlinear finite element procedure with respect to shape memory alloy hybrid composite (SMAHC) shell has been developed which incorporates a thermodynamically derived constitutive law for SMA behavior. Present illustrative applications involve rectangular laminated panels clamped along one side, although the method is applicable to more complicated laminates, geometries and boundary conditions. Panel geometry is discretized into specially-developed 3D degenerated eight-node laminated composite shell elements. General shell theory, involving incremental nonlinear finite element equilibrium that includes large deformations with Green-Lagrange strains, is employed. Several test cases which depend on volume fraction of SMA, temperature and ply angles are presented to illustrate the thermomechanical behavior of SMAHC. The results of numerical analysis show the ability of the suggested procedure to compute the thermomechanical behavior of SMAHC due to SMA’s internal phase transformations with stress and temperature.

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Yu, Ning, Andreas A. Polycarpou, and Jorge V. Hanchi. "Thermomechanical Finite Element Analysis of Impact-Induced Magnetic Erasures in Magnetic Storage Thin Film Media." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44359.

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Oblique impact of a slider with a rotating disk in hard disk drives was analyzed using the finite element method. A three dimensional, thermomechanical, impact model was developed to study the mechanical and thermal response during the impact of a spherical slider corner with the disk. The model was validated by comparing finite element results with analytical solutions for homogeneous glass disk under simple conditions. Impact penetration, stress and incurred flash temperature were obtained for various normal impact velocities.

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Ding, Hongtao, and Yung C. Shin. "A Metallo-Thermo-Mechanically Coupled Analysis of Orthogonal Cutting of AISI 1045 Steel." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7300.

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Materials often behave in a complicated manner involving deeply coupled effects among stress/stain, temperature and microstructure during a machining process. This paper is concerned with prediction of the phase change effect on orthogonal cutting of AISI 1045 steel based on a true metallo-thermo-mechanical coupled analysis. A metallo-thermo-mechanical coupled material model is developed, and a finite element model is used to solve the evolution of phase constituents, cutting temperature, chip morphology, and cutting force simultaneously using ABAQUS. The model validity is assessed using the experimental data for orthogonal cutting of AISI 1045 steel under various conditions, with cutting speeds ranging from 198 to 879 m/min, feeds from 0.1 to 0.3 mm, and tool rake angles from −7° to 5°. A good agreement is achieved in chip formation, cutting force and cutting temperature between the model predictions and the experimental data.

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Stokes, J., and L. Looney. "Finite Element Analysis of Residual Stress Generated by the HVOF Process." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0661.

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Abstract Due to the recent advances in thermal spraying technology, considerable research emphasis has been placed on the development of models capable of predicting deposition mechanisms at various stages during the process. In order to gain a deeper knowledge of the mechanisms involved in thermal spraying, it is necessary to isolate the factors affecting these constitutive properties (for example residual stress generation) and in doing so quantify the effect of the individual factors. Finite Element Analysis (FEA) is used in the present research to predict the residual stress generated in a WC-Co deposit produced via the HVOF process. The model is compared to an analytical technique and validated experimentally, the result of which provides a thermomechanical modelling procedure with an accuracy greater than 80% of that found experimentally. Combining FEA techniques with analytical and experimental results will enhance the understanding of residual stress in thermal spray techniques.

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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.

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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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Scott, De-Shin Liu, and Jack Hong. "An Explicit Finite Element Study of Shear Localization During Orthogonal Cutting Process." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0540.

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Abstract The shear localization phenomena during serrated chip formation in high speed orthogonal metal cutting process have been studied by using the explicit finite element analysis. A three dimensional computational model has been developed for analyzing dynamic thermomechanical deformations of a thermally softening viscoplastic workpiece material subjected to various tool cutting speeds and tool rake angles. The shear band characteristics such as temperature contour, effective plastic strain, effective plastic strain rate, propagating speed and orientation are investigated for each cases. Cutting forces can be estimated by this 3D model. The predictions of the finite element analysis are shown that above a critical high cutting speeds the secondary shear of the chip on rake surface appear to be a negligible effect which indicated the chip segments can be separate completely due to extensive shear in the primary shear zone; this phenomena agreed well with the experimental observations. The numerical model presented here can easily applied to study the oblique cutting process.

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