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Online since: April 2020
Authors: Mouhamadou Moustapha Sarr, Motohiro Yuasa, Hiroyuki Miyamoto
This study aims to investigate the effect of processing routes (A and Bc) and temperature on microstructure, texture and mechanical properties of pure magnesium was studied in this research.
To overcome these drawbacks, grain refinement has been used as an attractive solution to improve the mechanical properties of magnesium.
The improvement of mechanical properties of pure magnesium strongly depends on grain size as well as texture [1,2].
W., Kamado, S. and Kojima, Y., Influence of ECAP routes on microstructure and mechanical properties of Mg–Zn–Ca alloy.
[8] Li, Z., Zhou, S., and Huang, N., Effect of ECAE processing temperature on the microstructure, mechanical properties and corrosion behavior of pure magnesium.
To overcome these drawbacks, grain refinement has been used as an attractive solution to improve the mechanical properties of magnesium.
The improvement of mechanical properties of pure magnesium strongly depends on grain size as well as texture [1,2].
W., Kamado, S. and Kojima, Y., Influence of ECAP routes on microstructure and mechanical properties of Mg–Zn–Ca alloy.
[8] Li, Z., Zhou, S., and Huang, N., Effect of ECAE processing temperature on the microstructure, mechanical properties and corrosion behavior of pure magnesium.
Online since: May 2015
Authors: Ľudmila Dulebová, Emil Spišák, Oleksandr Grytsenko, Volodymyr Moravskii, Oleg Suberlyak
Such coatings provide products with insulating, antifriction and other properties.
Hydrogel materials on the basis of co-polymers 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP), which offer a complex of valuable properties [1] attract a special attention.
With dispersed metals powders introduction as fillers in polymer matrix structure we can obtain new composite hydrogel coatings, which, depending on the nature of the filler will have a new set of properties [2].
Metallic surface affects the adhesion strength as well.
It is obviously, that the main factor in polymer coating formation is adsorption of monomer molecules and PVP macromolecules on metallic surface.
Hydrogel materials on the basis of co-polymers 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP), which offer a complex of valuable properties [1] attract a special attention.
With dispersed metals powders introduction as fillers in polymer matrix structure we can obtain new composite hydrogel coatings, which, depending on the nature of the filler will have a new set of properties [2].
Metallic surface affects the adhesion strength as well.
It is obviously, that the main factor in polymer coating formation is adsorption of monomer molecules and PVP macromolecules on metallic surface.
Online since: June 2013
Authors: Ling Feng Li
In engineering practice, flow velocity is often the only controllable mechanical index.
In a gas well with high content of hydrogen sulfide, flow velocity is the main factor affecting the deposition of elemental sulfur.
The study of mass transfer between water and hydrocarbon phase indicates that when gas phase coexists with water, the carbon dioxide, hydrogen sulfide, methane, and so on, in the gas phase may be dissolved in the water phase, which may cause a change in gas phase composition and also cause the change of some gas phase properties, thus causing a change of tubing wall corrosion state.
When tubing continuously vibrates, mechanical waves may cause dynamic fracturing at cracks in the tubing.
[8] Wan Xiping, Zhu Jinchuan, et al., (Trans.), The Carbon Dioxide Corrosion Control in Oil and Gas Production—Factors Considered in Design(Petrochemistry Press, China 2002)(In Chinese)
In a gas well with high content of hydrogen sulfide, flow velocity is the main factor affecting the deposition of elemental sulfur.
The study of mass transfer between water and hydrocarbon phase indicates that when gas phase coexists with water, the carbon dioxide, hydrogen sulfide, methane, and so on, in the gas phase may be dissolved in the water phase, which may cause a change in gas phase composition and also cause the change of some gas phase properties, thus causing a change of tubing wall corrosion state.
When tubing continuously vibrates, mechanical waves may cause dynamic fracturing at cracks in the tubing.
[8] Wan Xiping, Zhu Jinchuan, et al., (Trans.), The Carbon Dioxide Corrosion Control in Oil and Gas Production—Factors Considered in Design(Petrochemistry Press, China 2002)(In Chinese)
Online since: January 2016
Authors: Agus Sunjarianto Pamitran, Nasruddin Nasruddin, Muhammad Idrus Alhamid, Sentot Novianto, T.A. Simanjuntak
This study also investigated which fluid properties gave higher effect on the frictional pressure drop due to its change over the process based on the recent experiment data.
This study also investigated which fluid properties gave higher effect on the frictional pressure drop due to its change over the process.
Increasing the heat flux will raise the fluid temperature which causes changing of fluid properties such as density and viscosity.
This work also clearly showed the influence of fluid properties which were changing during heating such as fluid density and viscosity.
The result showed that the fluid viscousity is more dominant affecting the frictional pressure drop.
This study also investigated which fluid properties gave higher effect on the frictional pressure drop due to its change over the process.
Increasing the heat flux will raise the fluid temperature which causes changing of fluid properties such as density and viscosity.
This work also clearly showed the influence of fluid properties which were changing during heating such as fluid density and viscosity.
The result showed that the fluid viscousity is more dominant affecting the frictional pressure drop.
Online since: September 2011
Authors: Xin Zheng Wang, Jian Jie Chen, Guang Ping Zou, Li Ping
The characteristics of high-level radioactive waste storage structure are analyzed, and the frequencies corresponding to the maxim modal participation factors are gain.
The factors that affect the structural safety must be systematically studied, on the basis of which, the reasonable and simplified model is gained.
The impact factor affecting the nearest shield structure is the deformation of the metal vessel centaining radioactive materials.
There is lightweight aggregate concrete in the vessel, assuming the radioactive waste does not affect the basic mechanical properties of concrete, and the radioactive substance in the vessel is treated as lightweight aggregate concrete in the numerical simulation.
As can be seen, although the number of modes corresponding to the maxim modal participation factor is not the same, the number is close to each other and the difference between the frequencies of the maxim modal participation factors is less.
The factors that affect the structural safety must be systematically studied, on the basis of which, the reasonable and simplified model is gained.
The impact factor affecting the nearest shield structure is the deformation of the metal vessel centaining radioactive materials.
There is lightweight aggregate concrete in the vessel, assuming the radioactive waste does not affect the basic mechanical properties of concrete, and the radioactive substance in the vessel is treated as lightweight aggregate concrete in the numerical simulation.
As can be seen, although the number of modes corresponding to the maxim modal participation factor is not the same, the number is close to each other and the difference between the frequencies of the maxim modal participation factors is less.
Online since: March 2007
Authors: Liang Zuo, N.R. Tao, W.P. Tong, L.M. Wang, G.J. Ma
A nanostructured surface layer on a pure iron sample was prepared by surface
mechanical attrition treatment (SMAT).
It is very difficult to obtain the intrinsic thermal stability and properties due to the defects induced in the processing procedures of nanocrystalline samples.
Therefore, in order to reveal the intrinsic thermal stability and mechanical properties of nanocrystalline materials, porosity-free and contamination-free nanocrystalline pure metal samples are needed.
It was found that a high magnetic field can affect violently grain growth in nanocrystalline iron. 2.
In the present work, one of the dominant factors influencing grain growth in the transition from rapid to negligible grain growth, is the existence of the high magnetic field which generates magnetic free-energy, the magnitude of which depends on the grain orientation [14].
It is very difficult to obtain the intrinsic thermal stability and properties due to the defects induced in the processing procedures of nanocrystalline samples.
Therefore, in order to reveal the intrinsic thermal stability and mechanical properties of nanocrystalline materials, porosity-free and contamination-free nanocrystalline pure metal samples are needed.
It was found that a high magnetic field can affect violently grain growth in nanocrystalline iron. 2.
In the present work, one of the dominant factors influencing grain growth in the transition from rapid to negligible grain growth, is the existence of the high magnetic field which generates magnetic free-energy, the magnitude of which depends on the grain orientation [14].
Online since: July 2014
Authors: E. Fenollosa, Ana Almerich-Chuliá, Ivan Cabrera
Concrete’s creep is one of the factors that increase lateral displacements of the bar in the long run.
Among the different composite section columns those composed by a metal profile encased with concrete offer other properties such as protection against fire and corrosion.
If a segment involves different materials, it will be divided in portions so as to determine the area and the stress which is affecting each one.
However in curve 2 the stress for concrete is affected by a coefficient with a value of 0,85.
Zhang: Concrete Shrinkage and Creep Effect Prediction Model and the Influence Factors Analysis.
Among the different composite section columns those composed by a metal profile encased with concrete offer other properties such as protection against fire and corrosion.
If a segment involves different materials, it will be divided in portions so as to determine the area and the stress which is affecting each one.
However in curve 2 the stress for concrete is affected by a coefficient with a value of 0,85.
Zhang: Concrete Shrinkage and Creep Effect Prediction Model and the Influence Factors Analysis.
Online since: January 2005
Authors: Byung Geol Kim, Su Dong Park, Shang Shu Kim, Hee Woong Lee
Recently, in order to ensure
stable line operation and to predict its span of life, the changes of thermal properties for STACIR/AW
have been investigated.
In the present work, the changes of strain with temperature and the creep behavior as important factors in sag control will be presented.
Since the STACIR/AW operates at high temperature ranges, it is quite necessary to evaluate the aging properties of component materials.
In the present work, among the results of detailed resent researches on STACIR/AW, the strain change with temperature and the creep behavior as important factors on the sag control are briefly described.
The mechanical load for tensile test of STACIR/AW was 20% of UTS.
In the present work, the changes of strain with temperature and the creep behavior as important factors in sag control will be presented.
Since the STACIR/AW operates at high temperature ranges, it is quite necessary to evaluate the aging properties of component materials.
In the present work, among the results of detailed resent researches on STACIR/AW, the strain change with temperature and the creep behavior as important factors on the sag control are briefly described.
The mechanical load for tensile test of STACIR/AW was 20% of UTS.
Online since: February 2016
Authors: Józef Gawlik, Joanna Krajewska-Śpiewak, Wojciech Zębala
Cutting conditions affect the properties of the subsurface layer as well as the properties of the machined elements.
These factors significantly affect the properties of the subsurface layer; · external friction dominates in the contact zone of the chip-and rake face of the cutting edge.
Firstly, cutting speed affects the stress concentration area.
Secondly, cutting speed affects the change of the direction of stresses (Fig.1a).
Properties of the workpiece, cutting edge geometry and cutting parameters are factors that affect the interactivity and complexity of decohesion process [8, 9].
These factors significantly affect the properties of the subsurface layer; · external friction dominates in the contact zone of the chip-and rake face of the cutting edge.
Firstly, cutting speed affects the stress concentration area.
Secondly, cutting speed affects the change of the direction of stresses (Fig.1a).
Properties of the workpiece, cutting edge geometry and cutting parameters are factors that affect the interactivity and complexity of decohesion process [8, 9].
Online since: October 2009
Authors: Ian A. Ashcroft, Zahid R. Khokhar, Vadim V. Silberschmidt
The performance of FRPCs is
affected by multi-mechanism damage evolution under loading which in turn is affected by
microstructural stochasticity in the material.
Another important factor is the effect of microstructural randomness on the delamination behaviour in FRPC laminates.
This was achieved by introducing cohesive zone properties in terms of the fracture energy.
Fig. 3 Damage initiation in [01/904/01] laminate under tension- A close up A number of statistical realisations of the distribution of fracture properties were simulated for the random fracture properties based on the Weibull's probability distribution, in addition to a case with uniform fracture properties.
Approximately 70% of the cases with random fracture properties resulted in values of crack length higher than those seen in the uniform properties case.
Another important factor is the effect of microstructural randomness on the delamination behaviour in FRPC laminates.
This was achieved by introducing cohesive zone properties in terms of the fracture energy.
Fig. 3 Damage initiation in [01/904/01] laminate under tension- A close up A number of statistical realisations of the distribution of fracture properties were simulated for the random fracture properties based on the Weibull's probability distribution, in addition to a case with uniform fracture properties.
Approximately 70% of the cases with random fracture properties resulted in values of crack length higher than those seen in the uniform properties case.