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thermomechanical analysis of (Cu_(0.5)Tl_(0.5))-1223 Substituted by Pr and La

Journal of Materials Science & Technology 2012年第2期28卷 169-176页

作者： A.I.Abou Aly R.Awad I.H.Ibrahim M.Kamal M.Anas Physics Department Faculty of ScienceAlexandria University Physics Department Faculty of ScienceMansoura University

The thermomechanical analysis （TMA） of Cu0.5T10.5Ba2Ca2-xRxCu30110-δ, where R=Pr and La, with 0.0〈x〈0.15, was carried out in temperature range from 450 to 1145 K. The samples were prepared by singlestep solid state reaction technique. The prepared samples were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The superconductivity of the prepared samples was investigated by electrical resistivity measurement. The results showed that low substitution content enhanced the （Cu0.5Tlo.5）- 1223 phase formation, while the higher substitution content degraded this phase. The higher superconducting transition temperatures Tc were found to be 114 K and 109 K at x= 0.025 for Pr- and La-substitutions, respectively. The average linear thermal expansion coefficient increased as x increased, while the shrinkage temperature decreased as x increased. Those results were emphasized by porosity and Vickers microhardness calculations. Debye temperature 0D was calculated from the linear thermal expansion coefficient data and correlated to Tc to estimate the electron-phonon coupling λep.

关键词： (Cu0.5Tl0.5)-1223 thermomechanical analysis Thermal expansion coefficient Debye temperature

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Comparing the Behavior of Reinforced Concrete Columns Embedded in Walls and Subjected to Fire

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Journal of Civil Engineering and Architecture 2022年第7期16卷 354-361页

作者： Bruno Carvalho Lima de Alencar Matos Fernando Luis da Silva Ferreira João Paulo Correia Rodrigues Rodrigo Barreto Caldas Department of Civil Engineering University of CoimbraCoimbra 3030-788Portugal Department of Civil Engineering Federal University of Minas GeraisBelo Horizonte-MG 31270-901Brazil

Fire is an exceptional action that may occur during the life of a ***,it must be considered when designing a building *** standards provide several types of design methods for that propose,used for single elements,parts of structure or the structure as a *** fire design of columns is important both for new project as for remodel buildings and also for verification of the residual resistance of columns that have suffered a fire *** this way,the aim of this work is to analyze numerically different ways of fire exposure to check the compressive strength of the columns when subjected to fire and the influence of the adjacent walls to a column in case of *** thermal advanced analysis of the sections columns was performed using the finite element software,Abaqus CAE,where the standard fire curve,ISO 834(International Organization for Standardization 834),was used,with 4 h of fire *** was possible,with the two methods used in this work,to compare them to verify which model is more conservative and which is closer to the advanced numerical model,for calculating temperatures in the column *** was checked that the walls act as thermal insulators,protecting part of the columns from the convection and radiation of the ***,the effects of raising the temperature over the compressive resistance of the reinforced concrete column,were reduced.

关键词： Column reinforced concrete thermomechanical analysis fire

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Thermo-Mechanical analysis of a Typical Vehicle Engine Using PTC-Creo

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Journal of Mechanical Materials and Mechanics Research 2022年第2期5卷 1-15页

作者： Jafar Mahmoudi Department of Sustainable Production Development School of Industrial Engineering and ManagementKTH Royal Institute of TechnologyStockholmSweden

In this work,a typical vehicle engine is modeled within PTC-Creo software,and its thermal,mechanical,and thermo-mechanical performance are *** is followed by the vibrational,fatigue,and buckling analysis of the assembly of components,which are the predominant failure caus*** results show that the least temperature gradient occurs in the center of the pin,which connects the piston to the connecting rod,the maximum displacement is seen just below the piston head,and the thermo-mechanical failure is caused mostly(about 85%)by the mechanical load rather than the thermal ***,in fatigue analysis,the minimum and maximum values for the safety factor are 0.63 and 5,*** results can prevent the reoccurrence of similar failures and help the enhancement of the components’design and manufacturing process.

关键词： Stress analysis Engine failure PTC-Creo thermomechanical analysis

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