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Journal articles on the topic 'Thermo-chemo-mechanical analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Li, Rong Tao. "Coupled Damage and Plasticity Modeling in Failure Analysis of Heated Concrete." Advanced Materials Research 671-674 (March 2013): 1531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1531.

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A coupled elastoplastic-damage constitutive model with consideration of chemo-induced material elastoplastic-damage effects due to heating concrete is proposed. A consistent return mapping algorithm for the integration of the rate coupled constitutive equations is developed. Consistent tangent modulus matrices for coupled chemo-thermo-hygro-mechanical analysis are derived to preserve the quadratic rate of convergence of the global Newton iterative procedure. Numerical results demonstrate the validity of the presented algorithm and illustrate the performance of the proposed constitutive model in reproducing coupled chemo-thermo-hygro-mechanical behavior in concretes subjected to fire.

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Bazazzadeh, Soheil, Marco Morandini, Mirco Zaccariotto, and Ugo Galvanetto. "Simulation of chemo-thermo-mechanical problems in cement-based materials with Peridynamics." Meccanica 56, no. 9 (2021): 2357–79. http://dx.doi.org/10.1007/s11012-021-01375-7.

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AbstractA chemo-thermo-mechanical problem is solved using a peridynamic approach to investigate crack propagation in non-reinforced concrete at early-age. In the present study, the temperature evolution and the variation of the hydration degree in conjunction with the mechanical behaviour of cement-based materials are examined. Firstly, a new peridynamic model is introduced to solve fully coupled chemo-thermal problems by satisfying thermal equilibrium condition and hydration law simultaneously and then the effects of the chemo-thermal analysis are imposed in the mechanical framework to investigate all the interactions. The proposed approach is used to solve 2D chemo-thermo-elastic problems and then it is applied to investigate the fracture of concrete structures. Additionally, we examine the accuracy of the method by comparing the crack paths, temperature and hydration degree with those achieved by applying other numerical methods and the experimental data available in the literature. A good agreement is obtained between all sets of results.

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Markenscoff, Xanthippi. "Hadamard instability analysis of “negative creep” in coupled chemo-thermo-mechanical systems." Continuum Mechanics and Thermodynamics 28, no. 1-2 (2015): 351–59. http://dx.doi.org/10.1007/s00161-015-0433-6.

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Li, Xikui, Rongtao Li, and B. A. Schrefler. "A coupled chemo-thermo-hygro-mechanical model of concrete at high temperature and failure analysis." International Journal for Numerical and Analytical Methods in Geomechanics 30, no. 7 (2006): 635–81. http://dx.doi.org/10.1002/nag.495.

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Zhao, Haitao, Kaidi Jiang, Bin Hong, et al. "Experimental and Numerical Analysis on Coupled Hygro-Thermo-Chemo-Mechanical Effect in Early-Age Concrete." Journal of Materials in Civil Engineering 33, no. 5 (2021): 04021064. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0003666.

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Chen, Bowen, Hicham Chaouki, Donald Picard, Julien Lauzon-Gauthier, Houshang Alamdari, and Mario Fafard. "Modeling of Thermo-Chemo-Mechanical Properties of Anode Mixture during the Baking Process." Materials 14, no. 15 (2021): 4320. http://dx.doi.org/10.3390/ma14154320.

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In the Hall–Héroult process, prebaked carbon anodes are utilized to produce primary aluminium. The quality of the anode plays a crucial role in the efficiency of electrowinning primary aluminium. In the production of anodes, the anode baking is considered as the stage most frequently causing anode problems. During the baking process, the anode undergoes complex physicochemical transformations. Moreover, the anode at a lower position, imposed by loading pressures from upper anodes, will creep during this process. Thus, the production of high-quality anodes demands efficient control of their baking process. This paper aims to investigate the thermo-chemo-mechanical properties of the anode paste mixture at high temperatures. These properties include kinetic parameters of pitch pyrolysis such as the activation energy and the pre-exponential factor, the thermal expansion coefficient (TEC) and relevant mechanical parameters related to the elastic, the viscoelastic and the viscoplastic behaviours of the anode. For this purpose, experiments consisting of the thermogravimetric analysis, the dilatometry and the creep test were carried out. Based on the obtained results, the forementioned parameters were identified. Relevant mechanical parameters were expressed as a function of a new variable, called the shrinking index, which is related to the volatile released in open and closed pores of the anode. This variable would be used to highlight the chemo-mechanical coupling effect of the anode mixture. New insights into the phenomena such as the expansion due to the increase of the pore pressure and the chemical shrinkage of the anode during the baking process were also gained in this work. These investigations pave the way for modeling the thermo-chemo-poromechanical behaviour of the anode during the baking process.

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Zhou, Xiaoxian, and Ahmad Ghassemi. "Finite element analysis of coupled chemo-poro-thermo-mechanical effects around a wellbore in swelling shale." International Journal of Rock Mechanics and Mining Sciences 46, no. 4 (2009): 769–78. http://dx.doi.org/10.1016/j.ijrmms.2008.11.009.

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Yuan, Zifeng, Venkat Aitharaju, and Jacob Fish. "A coupled thermo‐chemo‐mechanical reduced‐order multiscale model for predicting process‐induced distortions, residual stresses, and strength." International Journal for Numerical Methods in Engineering 121, no. 7 (2019): 1440–55. http://dx.doi.org/10.1002/nme.6274.

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Cecconi, Manuela, Costanza Cambi, Stefano Carrisi, Dimitri Deneele, Enza Vitale, and Giacomo Russo. "Sustainable Improvement of Zeolitic Pyroclastic Soils for the Preservation of Historical Sites." Applied Sciences 10, no. 3 (2020): 899. http://dx.doi.org/10.3390/app10030899.

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Climate changes are inducing a modification of environmental loads on historical sites, requiring new actions towards their conservation. In the paper, the results of an experimental work on sustainable improvement of a pyroclastic soil belonging to the Orvieto cliff (Central Italy) have been investigated in the perspective of its preservation from degradation. The slightly coherent facies of Orvieto Ignimbrite (pozzolana) was treated with hydrated lime and the subsequent chemo-physical evolution was investigated by means of a multi-scale analysis. The beneficial effects obtained from the improvement in terms of mechanical behaviour were interpreted and correlated to the chemo-physical evolution of the system. Microstructural analyses, X-ray diffractometry, thermo-gravimetric analyses (DTG), SEM observations, mercury intrusion porosimetry performed on raw and treated samples, showed that the pozzolanic reactions develop since the very beginning in the system and that the observed mechanical improvement of the treated soil is mainly due to the formation of calcium silicate hydrates (CSH) and calcium aluminate hydrates (CAH). In the paper, the mechanical improvement is put in evidence by comparing the results of oedometer tests performed on both raw and treated samples.

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De Sarno, Domenico, Enza Vitale, Dimitri Deneele, et al. "Effects of cement and foam addition on chemo-mechanical behaviour of lightweight cemented soil (LWCS)." E3S Web of Conferences 92 (2019): 11006. http://dx.doi.org/10.1051/e3sconf/20199211006.

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One of the main problems encountered in civil engineering is the management of large amounts of excavated soil, especially when the mechanical properties of this soil are not suitable for its reuse as a construction material. However, the excavated soil could represent a resource if appropriately improved. A suitable solution is the addition of cement and foam to produce lightweight cemented soils (LWCS). In this paper, an insight into the influence of foam on chemo-mineralogical and microstructural features of soil-cement-water system is presented. Time dependent mineralogical and microstructural changes have been monitored by means of X-Ray Diffraction, Thermo-gravimetric analysis and Mercury Intrusion Porosimetry. The present study shows that addition of foam does not alter the chemo-physical evolution of the soil-cement-water system. Large voids are present in the samples as footprint of air bubbles upon mixing, thus increasing porosity. Macroscopic behaviour of treated samples has been investigated by direct shear and oedometric tests. Chemo-physical evolution induced by cement addition is the major responsible for mechanical improvement showed by treated samples. Porosity of samples induced by foam addition plays a key role in the mechanical response of LWCS, inducing a transition of stress-strain behaviour from brittle and dilative to ductile and contractive as a function of increasing foam content.

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Sun, Zizheng, Yiming Zhang, Yong Yuan, and Herbert A. Mang. "Stability analysis of a fire‐loaded shallow tunnel by means of a thermo‐hydro‐chemo‐mechanical model and discontinuity layout optimization." International Journal for Numerical and Analytical Methods in Geomechanics 43, no. 16 (2019): 2551–64. http://dx.doi.org/10.1002/nag.2991.

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Pourbehi, Mohammad Sadegh, and Gideon P. A. G. van Zijl. "Seismic Analysis of the Kleinplaas Dam Affected by Alkali-Silica Reaction Using a Chemo-Thermo-Mechanical Finite Element Numerical Model Considering Fluid Structure Interaction." Journal of Advanced Concrete Technology 17, no. 8 (2019): 462–73. http://dx.doi.org/10.3151/jact.17.462.

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Chen, Bowen, Hicham Chaouki, Donald Picard, Julien Lauzon-Gauthier, Houshang Alamdari, and Mario Fafard. "Physical Property Evolution of the Anode Mixture during the Baking Process." Materials 14, no. 4 (2021): 923. http://dx.doi.org/10.3390/ma14040923.

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The Hall-Héroult process uses prebaked carbon anodes as electrodes. The anode’s quality plays a crucial role in the efficiency of the aluminium production process. During the baking process, the anode undergoes complex physicochemical transformations. Thus, the production of high-quality anodes depends, among others, on the efficient control of their baking process. This paper aims to investigate the evolution of some physical properties of the anode paste mixture during the baking process. These properties include the mass loss fraction, real and apparent densities, the ratio of apparent volume, the permeability, and porosities. For this purpose, experiments consisting of thermogravimetric analysis, dilatometry, air permeability, and helium-pycnometric measurements were carried out. The anode permeability at high temperatures was linked to the air permeability through a permeability correlator due to experimental limitations. Moreover, the real density at high temperatures was estimated by combining real densities of the coal tar pitch and coke aggregates. Different porosities, such as the open porosity and the closed porosity related to the pitch binder, were estimated by taking the permeability at high temperatures into account. In this context, the effect of the permeability correlator, which was introduced to link the permeability at high temperatures to the air permeability, was investigated through a sensitivity analysis. These results allow an estimation of the shrinking index, a new variable introduced to reflect the baking level of the anode mixture, which is linked to the volatile that is released in both open and closed pores. Afterwards, the pore pressure inside closed pores in the coal tar pitch was estimated. The obtained results highlight some new insights related to the baking process of the anode mixture. Moreover, they pave the way for better modeling of the thermo-chemo-mechanical behavior of anodes at high temperatures.

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Blond, Eric, Tarek Merouki, Nicolas Schmitt, Emmanuel de Bilbao, and Alain Gasser. "Multiphysics Modelling Applied to Refractory Behaviour in Severe Environments." Advances in Science and Technology 92 (October 2014): 301–9. http://dx.doi.org/10.4028/www.scientific.net/ast.92.301.

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It is a common practice to design refractory linings with the help of thermal computations, thermochemistry analyses and strong workman know-how. Their mechanical design is often limited to simple thermo-elastic computations. Sometimes computations are refined considering non-linear mechanical behaviour, even if corrosion often induces additional chemical strain and strong change in service of the mechanical behaviour of the refractory. The aim of this presentation is to briefly recast the irreversible thermodynamic framework in order to underline the implications of some basic thermodynamic concepts in term of refractory behaviour modelling. Then, the use of these concepts to develop fully 3D finite element simulations accounting simultaneously for thermal, mechanical and chemistry phenomena will be illustrated on the particular case of SiC-based refractory. Comparison between long duration oxidation test at high temperature and model prediction allows the validation of the proposed approach. Then, an extension to the industrial case of refractory lining in Waste to Energy plant will be illustrated. The interest of taking into account the thermo-chemo-mechanical coupling effects is shown.

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Lin, Mingxuan, Carina Zimmermann, Kai Wang, Martin Hunkel, Ulrich Prahl, and Robert Spatschek. "Modeling Bainitic Transformations during Press Hardening." Materials 14, no. 3 (2021): 654. http://dx.doi.org/10.3390/ma14030654.

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We revisit recent findings on experimental and modeling investigations of bainitic transformations under the influence of external stresses and pre-strain during the press hardening process. Experimentally, the transformation kinetics in 22MnB5 under various tensile stresses are studied both on the macroscopic and microstructural level. In the bainitic microstructure, the variant selection effect is analyzed with an optimized prior-austenite grain reconstruction technique. The resulting observations are expressed phenomenologically using a autocatalytic transformation model, which serves for further scale bridging descriptions of the underlying thermo-chemo-mechanical coupling processes during the bainitic transformation. Using analyses of orientation relationships, thermodynamically consistent and nondiagonal phase field models are developed, which are supported by ab initio generated mechanical parameters. Applications are related to the microstructure evolution on the sheaf, subunit, precipitate and grain boundary level.

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Kimoto, Sayuri, Fusao Oka, and Tomohiko Fushita. "A chemo–thermo–mechanically coupled analysis of ground deformation induced by gas hydrate dissociation." International Journal of Mechanical Sciences 52, no. 2 (2010): 365–76. http://dx.doi.org/10.1016/j.ijmecsci.2009.10.008.

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Li, Jia, Zhengsong Qiu, Hanyi Zhong, Xin Zhao, and Weian Huang. "Analysis of Chemo-Poro-Thermo-Mechanical Effects on Wellbore Strengthening." Journal of Energy Resources Technology 142, no. 12 (2020). http://dx.doi.org/10.1115/1.4047460.

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Abstract The application of wellbore strengthening treatment has less effect on shale formations. Several numerical studies were developed to describe the mechanism, which promoted the development of wellbore strengthening theory. Previous studies explored the mechanism mainly by considering the seepage flow. Therefore, multi-field coupled models were established to analyze the solute transmission, thermal convection, and heat conduction on wellbore strengthening by introducing the theory of multi-field coupling into physical model. First, the fracture width distribution and wellbore tangential stress were investigated to research the interaction of thermal and chemical effects with different gradients. Then, the concrete mechanism of temperature and solute concentration gradient was analyzed based on the distribution of pore pressure and stress field. Results show that the prediction of hoop stress and fracture aperture may not be accurate without considering the influence of solute transfer, thermal convection, and heat conduction, because stress state is mainly affected by temperature field and the pore pressure varies greatly under different chemical gradients. Additionally, the lower temperature and larger solute concentration improve the wellbore strengthening effect of drilling fluid.

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Del Monaco, Adriana, ER Duek, Aron José Pazin de Andrade, and SM Malmonge. "Alternative methods of sterilization on films of polymers: Poly(-L-lactic acid) (PLLA), Poly(L-lactic acid-co-glycolic acid) (PLGA) and Poly(-LD-lactic acid) (PLDLA), for bioresorbable vascular scaffolds models." Academic Society Journal, December 1, 2018, 248–56. http://dx.doi.org/10.32640/tasj.2018.4.248.

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Biodegradable polymers have been the subject of study for more than three decades because of their unique characteristics such as: biocompatibility and non-immunogenic and non-toxic properties, revealing their great acceptance in living organisms and being used as fastening elements in materials such as prostheses, sutures, drug encapsulation matrices and several important applications. The Poly(-lactic acid) (PLLA and PLDLA) and its glycolic acid copolymer (PLGA), present great biocompatibility. A problem when using polymers in bioengineering is sterilization process, which should enable the inactivation of a wide variety of microorganisms without affecting the properties of the materials of the device sterilized. Most of the processes used have limitations for use in thermo sensitive and chemo sensitive materials. Among the alternatives are ultraviolet radiation (UV) and plasma of hydrogen peroxide. This project tested these two alternatives methods, in films and tubes of these polymers. After the process of sterilization, no changes were found in thermal properties evaluated by differential scanning calorimetric analysis (DSC) and termogravimetric analysis (TGA). The mechanical properties of the PLLA, PLDLA and PLGA materials after the sterilization processes, also presents no changes, by UV and plasma, indicating the stability of samples to these processes.

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