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Articles de revues sur le sujet « Thermomechanical Analysi »

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Auteur : Grafiati
Publié le 14 mars 2023

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1

Skubisz, Piotr, Marek Packo, Katarzyna Mordalska et Tadeusz Skowronek. « Effect of High Strain-Rate Thermomechanical Processing on Microstructure and Mechanical Properties of Ti-10V-2Fe-3Al Alloy ». Advanced Materials Research 845 (décembre 2013) : 96–100. http://dx.doi.org/10.4028/www.scientific.net/amr.845.96.

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Results of beta forging of titanium alloy Ti-10V-2Fe-3Al and subsequent thermal treatment are presented, with analysis of the effect of the processing route on the final mechanical properties, correlated with microstructure of thermomechanically processed material. Investigation of response to high strain-rate hot-forging of microstructure and mechanical properties is focused on the effect of the strengthening mechanisms in the material after two common manners of deformation typical of that alloy. The effect of deformation conditions on final microstructure and mechanical properties was analyzed in three crucial stages of thermomechanical processing, e.i. after deformation, quenching and aging. In result, conclusions were formulated as for processing conditions promoting high strength and/or ductility.
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2

Nava, Marcelo, Pedro Cunha de Lima et Emmanuel Pacheco Rocha Lima. « Influence of the Deep Cryogenic Treatment at the Phase Transformation Temperatures and at the Stabilization of the Cu-14Al-4Ni SMA Alloy ». Materials Science Forum 1012 (octobre 2020) : 331–36. http://dx.doi.org/10.4028/www.scientific.net/msf.1012.331.

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Deep cryogenic treatment (DCT) is industrially applied to improve the wear resistance characteristics of tool steels. However, on non-ferrous metals, the knowledge about the obtained characteristics after DCT is limited. The purpose of this work was to investigate how DCT affects the properties and the behavior of the Cu-14Al-4Ni alloy treated at different times and after thermomechanical cycling was performed. In the present investigation, there was performed a comparative experimental analysis of the transformation temperatures, microhardness and shape recovery capacity of the alloy obtained by smelting, treated by DCT and thermomechanically cycled. The DCT provided the stabilization of the martensitic phase β'1 and, consequently, the stabilization of the phase transformation temperatures and the shape recovery capacity of the shape memory effect of the alloy, increasing the alloy life.
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3

Shim, Kyu-Sang, Soram Oh, KeeYeon Kum, Yu-Chan Kim, Kwang-Koo Jee et Seok Woo Chang. « Mechanical and Metallurgical Properties of Various Nickel-Titanium Rotary Instruments ». BioMed Research International 2017 (2017) : 1–13. http://dx.doi.org/10.1155/2017/4528601.

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The aim of this study was to investigate the effect of thermomechanical treatment on mechanical and metallurgical properties of nickel-titanium (NiTi) rotary instruments. Eight kinds of NiTi rotary instruments with sizes of ISO #25 were selected: ProFile, K3, and One Shape for the conventional alloy; ProTaper NEXT, Reciproc, and WaveOne for the M-wire alloy; HyFlex CM for the controlled memory- (CM-) wire; and TF for the R-phase alloy. Torsional fracture and cyclic fatigue fracture tests were performed. Products underwent a differential scanning calorimetry (DSC) analysis. The CM-wire and R-phase groups had the lowest elastic modulus, followed by the M-wire group. The maximum torque of the M-wire instrument was comparable to that of a conventional instrument, while those of the CM-wire and R-phase instruments were lower. The angular displacement at failure (ADF) for the CM-wire and R-phase instruments was higher than that of conventional instruments, and ADF of the M-wire instruments was lower. The cyclic fatigue resistance of the thermomechanically treated NiTi instruments was higher. DSC plots revealed that NiTi instruments made with the conventional alloy were primarily composed of austenite at room temperature; stable martensite and R-phase were found in thermomechanically treated instruments.
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Ponomarev, Viktor S., Alexander V. Gerasimov, Sergey V. Ponomarev et Denis O. Shendalev. « Spacecraft reflectors thermomechanical analysis ». EPJ Web of Conferences 82 (2015) : 01005. http://dx.doi.org/10.1051/epjconf/20158201005.

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5

Price, D. M. « Modulated-temperature thermomechanical analysis ». Journal of Thermal Analysis and Calorimetry 51, no 1 (janvier 1998) : 231–36. http://dx.doi.org/10.1007/bf02719024.

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Price, Duncan M. « Modulated-temperature thermomechanical analysis ». Thermochimica Acta 357-358 (août 2000) : 23–29. http://dx.doi.org/10.1016/s0040-6031(00)00360-9.

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7

Białowąs, Barbara, et Karol Szymanowski. « Effect of thermomechanical densification of pine wood (Pinus sylvestris L.) on cutting forces and roughness during milling ». Annals of WULS, Forestry and Wood Technology 113 (31 mars 2021) : 36–42. http://dx.doi.org/10.5604/01.3001.0015.2330.

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Effect of thermomechanical densification of pine wood (Pinus sylvestris L.) on cutting forces and roughness during milling. The paper presents the results of research concerning the assessment of machinability of pine wood thermomechanically compacted. The assessment was made on the basis of the cutting forces and surface roughness after the milling process. Selected properties of native and modified wood were examined. Based on the research, it was found that compacted wood is characterized by higher cutting forces during milling. The surface quality after milling was examined and the roughness index Ra values were determined. The research shows that the modified wood is characterized by a lower Ra value both along and across the grain. Statistical analysis showed that the modification had a statistically significant effect on the values of cutting forces and the physical and mechanical properties of the tested wood.
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8

BRISCHETTO, S., et E. CARRERA. « THERMOMECHANICAL EFFECT IN VIBRATION ANALYSIS OF ONE-LAYERED AND TWO-LAYERED PLATES ». International Journal of Applied Mechanics 03, no 01 (mars 2011) : 161–85. http://dx.doi.org/10.1142/s1758825111000920.

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The free vibration problem of one-layered and two-layered metallic plates is investigated in this work. The thermomechanical effect is evaluated using a fully coupled thermomechanical model. The free frequency values of fully coupled problems are compared to the values of the pure mechanical problems. In pure mechanical models, the displacement is the only primary variable of the problem, while in fully coupled thermomechanical models, the temperature is also considered as a primary variable and the effect of the thermomechanical stiffness is evaluated. The thermoelastic coupling usually provides higher frequencies with respect to the pure mechanical case because it acts like a thermal source, which is proportional to the strain rate, which leads to a bigger global stiffness of the structure. Both thermomechanical and mechanical models are developed in the framework of Carrera's Unified Formulation (CUF). CUF permits several refined two-dimensional theories to be obtained with orders of expansion in the thickness direction, from linear to fourth-order, for both displacements and temperature. Both equivalent single layer and layer-wise approaches are considered for the multilayered plates. The thermomechanical effect is investigated, in terms of frequencies, for thick and thin one-layered and two-layered plates, and for lower and higher modes. It has mainly been concluded that the thermomechanical coupling: (a) Is correctly determined if both the thermal and mechanical parts are correctly approximated; (b) Is small for each investigated case; (c) Influences the various vibration modes in different ways; and (d) Has a limited dependence on the considered case, but this dependence vanishes if a global coupling is considered. Only fully coupled thermomechanical models allow to analyze this type of problem. The effect of the thermomechanical coupling on higher-order modes can only be investigated using refined two-dimensional theories.
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9

Collins, Jeff T., Jeremy Nudell, Gary Navrotski, Zunping Liu et Patric Den Hartog. « Establishment of new design criteria for GlidCop® X-ray absorbers ». Journal of Synchrotron Radiation 24, no 2 (20 février 2017) : 402–12. http://dx.doi.org/10.1107/s1600577517001734.

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An engineering research program has been conducted at the Advanced Photon Source (APS) in order to determine the thermomechanical conditions that lead to crack formation in GlidCop®, a material commonly used to fabricate X-ray absorbers at X-ray synchrotron facilities. This dispersion-strengthened copper alloy is a proprietary material and detailed technical data of interest to the synchrotron community is limited. The results from the research program have allowed new design criteria to be established for GlidCop® X-ray absorbers based upon the thermomechanically induced fatigue behavior of the material. X-ray power from APS insertion devices was used to expose 30 GlidCop® samples to 10000 thermal loading cycles each under various beam power conditions, and all of the samples were metallurgically examined for crack presence/geometry. In addition, an independent testing facility was hired to measure temperature-dependent mechanical data and uniaxial mechanical fatigue data for numerous GlidCop® samples. Data from these studies support finite element analysis (FEA) simulation and parametric models, allowing the development of a thermal fatigue model and the establishment of new design criteria so that the thermomechanically induced fatigue life of X-ray absorbers may be predicted. It is also demonstrated how the thermal fatigue model can be used as a tool to geometrically optimize X-ray absorber designs.
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10

Osetskyi, Oleksandr, Tetyana Gurina, Anna Poliakova et Stanislav Sevastianov. « Thermoplastic Analysis of Cluster Crystallization of Cryoprotective Solutions ». Problems of Cryobiology and Cryomedicine 31, no 3 (25 septembre 2021) : 203–13. http://dx.doi.org/10.15407/cryo31.03.203.

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For the first time the possibility of using thermomechanical analysis to construct the fragments of state diagrams of cryoprotective solutions in the zone of glass transition temperatures has been considered. A method for studying cluster crystallization of cryoprotective solutions based on thermomechanical curves has been developed. The parameters of thermomechanical curves of frozen aqueous solutions of dimethyl sulfoxide (DMSO), polyethylene oxide 1500 (PEO-1500), glycerol were analyzed and the relationship between these parameters and the cluster crystallization kinetics for these solutions was established. On the basis of experimentally obtained thermomechanical curves for the frozen solutions of DMSO and PEO-1500 the possibility of formation of clusters of two types has been shown: on the basis of ice and cryoprotective substance microcrystals. Additional experimental data were obtained to construct a complete state diagrams of cryoprotective solutions, which include the existing cluster phase areas.
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11

Pöpperlová, Jana, Xiuru Fan, Bernd Kuhn et Ulrich Krupp. « Up-Scaling of Thermomechanically Induced Laves Phase Precipitation in High Performance Ferritic (HiperFer) Stainless Steels ». Materials 14, no 7 (26 mars 2021) : 1635. http://dx.doi.org/10.3390/ma14071635.

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Fully ferritic stainless steels, strengthened by Laves phase precipitates, were developed for high-temperature application in the next generation of ultra-super-critical thermal power plants. Based on the rapid occurrence of thermomechanically induced precipitation in strengthening Laves phase particles, a novel thermomechanical process route for this class of steels was developed. A controlled precipitation of particles, in a desired morphology and quantity, and an optimization of the corresponding forging parameters was achieved on a laboratory scale. This article outlines the very first up-scaling experiment with these optimized forging parameters from the laboratory scale to the industrial scale. The precipitation behavior was analyzed, utilizing digital particle analysis of scanning electron microscopy (SEM) images, to estimate and compare the phase fraction of the precipitated Laves phase, as well as the particle size and distribution. Due to the up-scaling in the forging process, the behavior of the precipitation changed and the precipitation strengthening effect was decreased, in comparison with the laboratory scale.
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12

Pöpperlová, Jana, Xiuru Fan, Bernd Kuhn, Wolfgang Bleck et Ulrich Krupp. « Impact of Tungsten on Thermomechanically Induced Precipitation of Laves Phase in High Performance Ferritic (HiperFer) Stainless Steels ». Applied Sciences 10, no 13 (28 juin 2020) : 4472. http://dx.doi.org/10.3390/app10134472.

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High-chromium ferritic stainless steels strengthened by Laves phase precipitates were developed for a high-temperature application in steam power plants. The impact of tungsten content on the precipitation of the intermetallic Laves phase during the newly developed thermomechanical process route was investigated. Due to rapid thermomechanically induced precipitation, a considerable reduction in processing time in comparison to the conventional solely thermal two-step processing of high chromium ferritic steels was achieved. Nevertheless, comparable mechanical properties at room temperature, i.e., the ultimate tensile strength of 712 MPa and the yield strength of 434 MPa, were obtained. The microstructure was analyzed by scanning electron microscopy (SEM) in combination with digital particle analysis, to estimate the particle size and the phase fraction of the Laves phase. The mean particle size of 52 nm and the volume fraction of 4.11% were achieved. Due to the tungsten content, an increase in the volume fraction and particle size was observed, giving rise to the higher strengthening effect.
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13

Kilic, B., et E. Madenci. « Peridynamic Theory for Thermomechanical Analysis ». IEEE Transactions on Advanced Packaging 33, no 1 (février 2010) : 97–105. http://dx.doi.org/10.1109/tadvp.2009.2029079.

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14

Heller, M., J. F. Williams, S. Dunn et R. Jones. « Thermomechanical analysis of composite specimens ». Composite Structures 11, no 4 (janvier 1989) : 309–24. http://dx.doi.org/10.1016/0263-8223(89)90094-9.

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15

Kubo, Satoshi, Yasumitsu Uraki et Yoshihiro Sano. « Thermomechanical Analysis of Isolated Lignins ». Holzforschung 50, no 2 (janvier 1996) : 144–50. http://dx.doi.org/10.1515/hfsg.1996.50.2.144.

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16

Henderson, J. B., et W. D. Emmerich. « Polymer characterization using thermomechanical analysis ». Journal of Thermal Analysis 37, no 8 (août 1991) : 1825–31. http://dx.doi.org/10.1007/bf01912213.

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17

Ramos, J. I. « Analysis and thermomechanics ». Applied Mathematical Modelling 14, no 10 (octobre 1990) : 558. http://dx.doi.org/10.1016/0307-904x(90)90193-9.

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18

Barczewski, Mateusz, Aleksander Hejna, Paulina Kosmela, Olga Mysiukiewicz, Adam Piasecki et Kamila Sa�asi�ska. « High-density Polyethylene - Expanded Perlite Composites : Structural Oriented Analysis of Mechanical and Thermomechanical Properties ». Materiale Plastice 59, no 3 (3 octobre 2022) : 52–63. http://dx.doi.org/10.37358/mp.22.3.5605.

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As part of this work, research was carried out on the effect of the addition of expanded perlite (PR) on the mechanical and thermomechanical properties of high-density polyethylene (PE) composites. Composites containing from 1 to 10 wt% of the inorganic filler were produced. Polyethylene-based composites manufactured by twin-screw extrusion and formed in the compression molding process were subjected to mechanical, thermomechanical, and structural analyses. The structure of polymer composites and filler was analyzed using scanning electron microscopy (SEM). It has been correlated with the static tensile tests and results of dynamic thermomechanical analysis (DMA). As part of the work, several thermomechanical parameters were calculated, and the obtained results were discussed with the evaluation of interfacial adhesion based on microscopic analysis. The research showed that despite introducing a 10 wt% of particle-shaped filler, the composites show increased stiffness without noticeable deterioration in tensile strength, simultaneously reducing toughness and brittleness. The analysis of the thermomechanical properties showed the lack of significant effects of the filler influence on the polymer matrix.
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19

Aksan, Alptekin, et John J. McGrath. « Thermomechanical Analysis of Soft-Tissue Thermotherapy ». Journal of Biomechanical Engineering 125, no 5 (1 octobre 2003) : 700–708. http://dx.doi.org/10.1115/1.1614816.

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Soft-tissue thermotherapy based on sub-ablative heating of collagenous tissues finds widespread application in medicine such as tissue welding, thermokeratoplasty, skin resurfacing, elimination of discogenic pain in the spine and treatment of joint instability. In this paper, heat-induced thermomechanical response characteristics of collagenous tissues are quantified by means of in vitro experimentation with a representative model tissue (New Zealand white rabbit patellar tendon). Three distinct heat-induced thermomechanical response regimes (defined by the rate of deformation and the variation of material properties) are identified. Arrhenius damage integral representation of collagenous tissue thermal history is shown to be adequate in establishing the master response curves for quantification of thermomechanical response for modeling purposes. The trade-off between the improved kinematical stability and compromised mechanical stability of the heated collagenous tissue is shown to be the major challenge hindering the success of subablative thermotherapies.
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20

Gajek, Sebastian, Matti Schneider et Thomas Böhlke. « An FE-DMN method for the multiscale analysis of thermomechanical composites ». Computational Mechanics 69, no 5 (4 février 2022) : 1087–113. http://dx.doi.org/10.1007/s00466-021-02131-0.

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AbstractWe extend the FE-DMN method to fully coupled thermomechanical two-scale simulations of composite materials. In particular, every Gauss point of the macroscopic finite element model is equipped with a deep material network (DMN). Such a DMN serves as a high-fidelity surrogate model for full-field solutions on the microscopic scale of inelastic, non-isothermal constituents. Building on the homogenization framework of Chatzigeorgiou et al. (Int J Plast 81:18–39, 2016), we extend the framework of DMNs to thermomechanical composites by incorporating the two-way thermomechanical coupling, i.e., the coupling from the macroscopic onto the microscopic scale and vice versa, into the framework. We provide details on the efficient implementation of our approach as a user-material subroutine (UMAT). We validate our approach on the microscopic scale and show that DMNs predict the effective stress, the effective dissipation and the change of the macroscopic absolute temperature with high accuracy. After validation, we demonstrate the capabilities of our approach on a concurrent thermomechanical two-scale simulation on the macroscopic component scale.
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21

Cui, Jian Zhong, Cun Tang Wang et Fang Wei Xie. « Thermomechanical Coupled Analysis of Multidisc Friction Pairs in Hydro-Viscous Drive ». Advanced Materials Research 941-944 (juin 2014) : 2500–2503. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2500.

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A transient temperature-stress coupled analysis is performed to investigate the thermomechanical coupled analysis of multidisc friction pairs in Hydro-viscous drive under simulated operation conditions. The normal pressure on all the surfaces are obtained from the principle of force equilibrium and then the heat flux acting on the related surface are also deduced. Based on the finite element method, the 3-D transient thermal and thermomechanical models of single pair are established as the typical one. The distribution of thermal and thermomechanical behavior during the soft-start can be studied. The results show that the maximum temperature occurs at the center of each subregion, where hot spots can be observed. The minimum hoop stress distribution can be observed in the separator disk.
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22

Trochu, F., V. Brailovski, M. A. Meunier, P. Terriault et Y. Y. Qian. « Thermomechanical analysis of shape memory devices ». Bio-Medical Materials and Engineering 6, no 6 (1996) : 389–403. http://dx.doi.org/10.3233/bme-1996-6601.

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23

Leppänen, Anton, Asko Kumpula, Joona Vaara, Massimo Cattarinussi, Juho Könnö et Tero Frondelius. « Thermomechanical Fatigue Analysis of Cylinder Head ». Rakenteiden Mekaniikka 50, no 3 (21 août 2017) : 182–85. http://dx.doi.org/10.23998/rm.64743.

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The finite element simulation of a cylinder head has been carried out with Abaqus Standard using Z-mat material model, with thermal boundary conditions coming from combined conjugate heat transfer and gas-exchange simulations. The fatigue post-processing of results has been done with Z-post software using ONERA fatigue model. The resulting lifetime values have been found out to correspond well to observations from the field.
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24

Sikorski, M. E., C. P. Buckley, J. W. S. Hearle et S. K. Mukhopadhyay. « Flexible thermomechanical analysis of polymeric fibers ». Review of Scientific Instruments 64, no 7 (juillet 1993) : 1947–55. http://dx.doi.org/10.1063/1.1143981.

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25

Nielsen, A. H., et G. H. Smith. « Thermomechanical analysis of insulated subsea flowlines ». Proceedings of the Institution of Mechanical Engineers, Part M : Journal of Engineering for the Maritime Environment 218, no 2 (juin 2004) : 77–91. http://dx.doi.org/10.1243/1475090041651403.

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26

Marciano, Joseph, Pierre Michailesco, Emmanuel Charpentier, Luiz C. Carrera et Marc J. M. Abadie. « Thermomechanical analysis of dental gutta-percha ». Journal of Endodontics 18, no 6 (juin 1992) : 263–70. http://dx.doi.org/10.1016/s0099-2399(06)80952-0.

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27

Vı́zváry, Zs, P. Fürjes et I. Bársony. « Thermomechanical analysis of hotplates by FEM ». Microelectronics Journal 32, no 10-11 (octobre 2001) : 833–37. http://dx.doi.org/10.1016/s0026-2692(01)00070-2.

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28

Manich, A. M., J. Carilla, S. Vilchez, M. D. de Castellar, P. Oller et P. Erra. « Thermomechanical analysis of merino wool yarns ». Journal of Thermal Analysis and Calorimetry 82, no 1 (septembre 2005) : 119–23. http://dx.doi.org/10.1007/s10973-005-0851-y.

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29

Hayes, Michael D., et David L. Ahearn. « Thermomechanical Analysis of a Ceramic Cooker ». Journal of Failure Analysis and Prevention 13, no 4 (24 mai 2013) : 383–88. http://dx.doi.org/10.1007/s11668-013-9699-9.

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30

Nayebi, A., et S. Ansari Sadrabadi. « FGM elastoplastic analysis under thermomechanical loading ». International Journal of Pressure Vessels and Piping 111-112 (novembre 2013) : 12–20. http://dx.doi.org/10.1016/j.ijpvp.2013.04.028.

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Kulbekov, M. K., et Sh I. Khamraev. « Thermomechanical analysis of fired ceramic materials ». Glass and Ceramics 53, no 11 (novembre 1996) : 344–45. http://dx.doi.org/10.1007/bf01130920.

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32

Fu, Jian Yu, Di Wu, Bo Tian Zhou, Ye Yuan et Hu Yong Yan. « Design and Analysis of Multilayer Semiconductor Sensor for Acetone Gas Sensing ». Applied Mechanics and Materials 687-691 (novembre 2014) : 1113–16. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.1113.

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Portable breath acetone sensor has great potential in diabetes diagnosis for acetone is a selective breath maker for diabetes. In this paper, we propose a multilayer semiconductor sensor for acetone gas sensing. Device is designed with stress adjustment layer, support layer, metal layer, insulator and sensing film. Simulation is performed, electrothermal and thermomechanical analyses demonstrate that this device has good performance in power consumption and thermomechanical reliability.
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BERNARDINI, DAVIDE, et GIUSEPPE REGA. « CHAOS ROBUSTNESS AND STRENGTH IN THERMOMECHANICAL SHAPE MEMORY OSCILLATORS PART I : A PREDICTIVE THEORETICAL FRAMEWORK FOR THE PSEUDOELASTIC BEHAVIOR ». International Journal of Bifurcation and Chaos 21, no 10 (octobre 2011) : 2769–82. http://dx.doi.org/10.1142/s0218127411030131.

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In this two-part paper the problem of evaluating robustness and strength of chaos in thermomechanically-based Shape Memory Oscillators (SMO) is addressed. In the first part, a theoretical analysis of the main features of the pseudoelastic loops exhibited by the underlying Shape Memory Devices (SMD) is accomplished with the aim to establish a predictive framework for accompanying numerical investigations. The analysis is based on the evaluation of suitable synthetic indicators of the SMD behavior that can be computed from the model parameters before the computation of SMO actual trajectories, and provide information about the hysteresis loops and their dependence on temperature variations. By means of such indicators, a detailed analysis of the influence of thermomechanical coupling on the rate-dependent mechanical response is presented. It is shown that a careful interpretation of the synthetic indicators permits to obtain a reasonable estimation of the influence of various model parameters on the hysteresis loop area and slopes of the pseudoelastic plateaus, that are the main global aspects influencing the occurrence of chaotic responses. In the second part, the theoretical predictions based on the synthetic indicators will be exploited to interpret the results of a systematic numerical investigation based on an enhanced version of the Method of Wandering Trajectories.
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Tekriwal, P., et J. Mazumder. « Transient and Residual Thermal Strain-Stress Analysis of GMAW ». Journal of Engineering Materials and Technology 113, no 3 (1 juillet 1991) : 336–43. http://dx.doi.org/10.1115/1.2903415.

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A three-dimensional transient thermomechanical analysis has been performed for the Gas Metal Arc Welding process using the finite element method. Because the heat generated due to elasto-visco-plastic straining in welding is negligible in comparison to the arc heat input, the thermomechanical analysis is uncoupled into two parts. The first part performs a three-dimensional transient heat transfer analysis and computes entire thermal history of the weldment. The second part then uses results of the first part and performs a three-dimensional transient thermo-elastoplastic analysis to compute transient and residual distortions, strains and stresses in the weld. The thermomechanical model incorporates all the thermophysical and mechanical properties of the material as functions of temperature. Boundary conditions used in the numerical simulation are quite general and are matched with the experiment carried out to measure transient strains in the mild steel (0.22 percent carbon steel) weld. Good qualitative agreement was achieved between calculated and measured transient strains.
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Szynkaruk, Piotr, et Marek Wesołowski. « Thermomechanical analysis and thermal dielectric analysis in pharmacy ». Farmacja Polska 75, no 11 (29 décembre 2019) : 633–37. http://dx.doi.org/10.32383/farmpol/115750.

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Cox, Austin, Theocharis Baxevanis et Dimitris C. Lagoudas. « Finite Element Analysis of Precipitation Effects on Ni-Rich NiTi Shape Memory Alloy Response ». Materials Science Forum 792 (août 2014) : 65–71. http://dx.doi.org/10.4028/www.scientific.net/msf.792.65.

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Thermomechanical properties of precipitated NiTi shape memory alloys are investigated using the finite element method. The precipitated material microstructure is explored using a representative volume element with embedded Ni4Ti3 precipitates. Features such as precipitate coherency and distribution of Ni within the matrix due to the precipitation process are individually explored and characterized. Changes in the material’s macroscopic thermomechanical response due to this precipitation are determined.
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Jahan, Suchana, et Hazim El-Mounayri. « A Thermomechanical Analysis of Conformal Cooling Channels in 3D Printed Plastic Injection Molds ». Applied Sciences 8, no 12 (11 décembre 2018) : 2567. http://dx.doi.org/10.3390/app8122567.

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Plastic injection molding is a versatile process, and a major part of the present plastic manufacturing industry. The traditional die design is limited to straight (drilled) cooling channels, which don’t impart optimal thermal (or thermomechanical) performance. With the advent of additive manufacturing technology, injection molding tools with conformal cooling channels are now possible. However, optimum conformal channels based on thermomechanical performance are not found in the literature. This paper proposes a design methodology to generate optimized design configurations of such channels in plastic injection molds. The design of experiments (DOEs) technique is used to study the effect of the critical design parameters of conformal channels, as well as their cross-section geometries. In addition, designs for the “best” thermomechanical performance are identified. Finally, guidelines for selecting optimum design solutions given the plastic part thickness are provided.
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38

Daly, Matthew, Andrew Pequegnat, Yunhong N. Zhou et Mohammad I. Khan. « Fabrication of a novel laser-processed NiTi shape memory microgripper with enhanced thermomechanical functionality ». Journal of Intelligent Material Systems and Structures 24, no 8 (6 mai 2012) : 984–90. http://dx.doi.org/10.1177/1045389x12444492.

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The thermomechanical properties of nickel-titanium shape memory alloys have sparked significant research efforts seeking to exploit their exotic capabilities. Until recently, the performance capabilities of nickel-titanium devices have been inhibited by the retention of only one thermomechanical response. In this article, the application of a novel laser-processing technique is demonstrated to create a monolithic self-positioning nickel-titanium shape memory microgripper. Device actuation and gripping maneuvers were achieved by thermally activating processed material regions which possessed unique phase transformation onset temperatures and thermomechanical recovery characteristics. The existence of each thermomechanical material domain was confirmed through differential scanning calorimetry analysis. Independent thermomechanical recoveries of each embedded shape memory were captured using tensile testing methods. Deployment of each embedded shape memory was achieved using resistive heating, and in situ resistivity measurements were used to monitor progressive phase transformations.
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39

Yilbas, B. S. « Entropy analysis in relation to laser shortpulse heating of silver ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 217, no 9 (1 septembre 2003) : 1049–65. http://dx.doi.org/10.1243/095440603322407281.

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Laser shortpulse heating triggers non-equilibrium energy transport in the surface region of the metallic substrate. In this case, volumetric entropy generation is governed by the non-equilibrium energy transport due to coupling of electron and lattice subsystems as well as thermomechanical coupling in the lattice system. In the present study, non-equilibrium energy transport inside the metallic substrate is modelled using an electron kinetic theory approach. Volumetric entropy generation inside the substrate material during non-equilibrium energy transport is formulated. The effect of thermomechanical coupling on the energy transport is included in the analysis. Temperature and volumetric entropy profiles are computed for silver. It is found that an electron temperature well in excess of lattice site temperatures occurs in the surface vicinity of the substrate material. Volumetric entropy generation due to electron-lattice coupling dominates the other sources of entropy generation. Thermomechanical coupling has no significant effect on the volumetric entropy generation due to a small thermal displacement of the irradiated surface, which is in the order of 10-10 m at the centre of the irradiated spot.
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Rieger, A., et P. Wriggers. « Adaptive methods for thermomechanical coupled contact problems ». International Journal for Numerical Methods in Engineering 59, no 6 (7 janvier 2004) : 871–94. http://dx.doi.org/10.1002/nme.900.

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Taler, Dawid, et Paweł Madejski. « Thermomechanical CSM analysis of a superheater tube in transient state ». Archives of Thermodynamics 32, no 3 (1 décembre 2011) : 117–26. http://dx.doi.org/10.2478/v10173-011-0017-1.

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Thermomechanical CSM analysis of a superheater tube in transient state The paper presents a thermomechanical computational solid mechanics analysis (CSM) of a pipe "double omega", used in the steam superheaters in circulating fluidized bed (CFB) boilers. The complex cross-section shape of the "double omega" tubes requires more precise analysis in order to prevent from failure as a result of the excessive temperature and thermal stresses. The results have been obtained using the finite volume method for transient state of superheater. The calculation was carried out for the section of pipe made of low-alloy steel.
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Lagoudas, D. C., J. G. Boyd et Z. Bo. « Micromechanics of Active Composites With SMA Fibers ». Journal of Engineering Materials and Technology 116, no 3 (1 juillet 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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Wang, Xiu Juan, Xiu Ting Zheng, Wei Zheng et Si Zhu Wu. « Molecular Simulation of Polycarbonate and Thermomechanical Analysis ». Applied Mechanics and Materials 556-562 (mai 2014) : 441–44. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.441.

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The influence of molecular structure of polycarbonate on performance was systematically investigated by both experiment and molecular simulation. Different types of polycarbonate molecular chain models were built and analyzed by molecular simulation method. By combining experimental and simulation results, it is concluded that the polycarbonate-OQ2720 has better thermal stability, mechanical properties and optical performance, which is a better choice for aviation materials and manufacturing process.
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Bykiv, Nazarii, Volodymyr Iasnii, Petro Yasniy et Robert Junga. « Thermomechanical analysis of nitinol memory alloy behavior ». Scientific journal of the Ternopil national technical university 102, no 2 (2021) : 161–67. http://dx.doi.org/10.33108/visnyk_tntu2021.02.161.

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Shape memory alloys are functional materials characterized by the effect of shape memory and superelasticity. Due to these properties, they are widely used, particularly, in bioengineering, aeronautics, robotics and civil engineering. The temperatures of phase transformations and the influence of external temperature and strain rate on the functional and mechanical characteristics of Ni55.75Ti44.15 shape memory alloy are investigated in this paper. The temperature of alloy phase transformations is obtained by differential scanning calorimetry (DSC) in the temperature range from -70°C to 70°C. Diagrams of differential scanning calorimeters at different heating and cooling rates of Ni55.75Ti44.15 alloy is constructed and analyzed. Samples for mechanical tests are made of round rod 8 mm in diameter. The samples working area is 12.5 mm in length and 4 mm in diameter. Mechanical tests are carried out at temperatures close to the maximum value of the completion temperature of martensitic-austenitic transformation Af = 14.7°C. Diagrams of deformation under uniaxial tension are constructed and stresses of phase transformations, Young's modulus and relative elongations of transformation areas at different loading speeds and exterior temperatures are determined. Using Clausius-Clapeyron formula, it is shown that with simultaneous changes in temperature and strain rate, the stresses of phase transformations are largely due to changes in temperature rather than load rates. The coefficients of Clausius-Clapeyron equation for superelastic Ni55.75Ti44.15 alloy with shape memory, which are consistent with those known in the literature, are determined.
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Shojaefard, M. H., M. R. Ghaffarpour, A. R. Noorpoor et S. Alizadehnia. « Thermomechanical Analysis of an Engine Cylinder Head ». Proceedings of the Institution of Mechanical Engineers, Part D : Journal of Automobile Engineering 220, no 5 (mai 2006) : 627–36. http://dx.doi.org/10.1243/09544070jauto182.

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Wang, Tong Hong, et Yi-Shao Lai. « Submodeling Analysis for Path-Dependent Thermomechanical Problems ». Journal of Electronic Packaging 127, no 2 (28 septembre 2004) : 135–40. http://dx.doi.org/10.1115/1.1869513.

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In a finite element analysis, when localized behavior of a large model is of particular concern, generally one would refine the mesh until it captures the local solution adequately. Submodeling is an alternative way for solving this kind of problem. It provides a relatively accurate solution at a modest computational cost. For a valid submodeling analysis, the boundaries of the submodel should be sufficiently far away from local features so that St. Venant’s principle holds. Moreover, special treatments are required for solving problems that involve path-dependent characteristics. This paper presents a general procedure to perform submodeling analyses for path-dependent thermomechanical problems without a priori assumptions on the structural response. The procedure was benchmarked using a bimaterial strip and demonstrated through analyses on a bump chip carrier package assembly. The procedure is conducive to the numerical assessment of fatigue lives of electronic packages.
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Celentano, Diego J. « Thermomechanical analysis of the Taylor impact test ». Journal of Applied Physics 91, no 6 (15 mars 2002) : 3675–86. http://dx.doi.org/10.1063/1.1435836.

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Gaitas, Angelo, Sachi Gianchandani et Weibin Zhu. « A piezo-thermal probe for thermomechanical analysis ». Review of Scientific Instruments 82, no 5 (mai 2011) : 053701. http://dx.doi.org/10.1063/1.3587624.

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Donthireddy, P., et K. Chandrashekhara. « Nonlinear thermomechanical analysis of laminated composite beams ». Advanced Composite Materials 6, no 2 (janvier 1997) : 153–66. http://dx.doi.org/10.1163/156855197x00049.

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Pierre, Laurent, Denis Teissandier et Jean Pierre Nadeau. « Integration of thermomechanical strains into tolerancing analysis ». International Journal on Interactive Design and Manufacturing (IJIDeM) 3, no 4 (21 février 2009) : 247–63. http://dx.doi.org/10.1007/s12008-009-0058-8.

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