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Online since: October 2010
Authors: Yan Cui, Song Bo Xu, Lei Zhang, Shun Guo
It showed the densification is the most important factor which affects the thermal conductivity of the composites and the obtained highest thermal conductivity is 182W/m.K.
Another obvious disadvantage of CVI coating are the introduction of the expensive and time-consuming process will not only improve the production cost, but also induce more uncertain factors to vary the properties of the composites.
Mechanical properties with bend strength of 306MPa and Young's modulus of 280GPa for were also measured in this study.
Although the thermophysiacal properties of diamond/Al composite have been reported frequently, little information is available about their mechanical behavior.
High mechanical properties were also shown in this work with bend strength of 306MPa and Young's modulus of 286GPa.
Another obvious disadvantage of CVI coating are the introduction of the expensive and time-consuming process will not only improve the production cost, but also induce more uncertain factors to vary the properties of the composites.
Mechanical properties with bend strength of 306MPa and Young's modulus of 280GPa for were also measured in this study.
Although the thermophysiacal properties of diamond/Al composite have been reported frequently, little information is available about their mechanical behavior.
High mechanical properties were also shown in this work with bend strength of 306MPa and Young's modulus of 286GPa.
Online since: September 2012
Authors: Qing Fu Lin
The material properties of magnesium alloys [1]
Although pure magnesium has many advantages, but has lower mechanical properties, it has great restricted.
By the alloying elements in pure magnesium, it can significantly improve the physical, chemical and mechanical properties.
Magnesium alloy’s linear expansion coefficient, cutting heat, temperature and other factors will affect the accuracy of magnesium alloy parts, in choosing allowance, tool geometry, cutting parameters and fixture design, detection method, we have to make a good measure.
Most of forging magnesium alloy material use extrusion blanks, it was dealt with homogenization treatment before squeeze, reducing the anisotropy of mechanical properties.
Rapid solidification technology [5] Rapid solidification technology is a molding process emerging in recent years, the use of this technology can get very small grains, thereby enhancing the mechanical properties of alloy and thermal stability.
By the alloying elements in pure magnesium, it can significantly improve the physical, chemical and mechanical properties.
Magnesium alloy’s linear expansion coefficient, cutting heat, temperature and other factors will affect the accuracy of magnesium alloy parts, in choosing allowance, tool geometry, cutting parameters and fixture design, detection method, we have to make a good measure.
Most of forging magnesium alloy material use extrusion blanks, it was dealt with homogenization treatment before squeeze, reducing the anisotropy of mechanical properties.
Rapid solidification technology [5] Rapid solidification technology is a molding process emerging in recent years, the use of this technology can get very small grains, thereby enhancing the mechanical properties of alloy and thermal stability.
Online since: December 2016
Authors: Hideki Mori
Temperature and Stress Dependence of Mobility of Screw Dislocation
in BCC Iron
Hideki Mori1,a
1Department of Mechanical Engineering, College of Industrial Technology,
1-27-1 Nishikoya, Amagasaki, Hyogo 661-0047, Japan
amorih@cit.sangitan.ac.jp
Keywords: Bcc iron, screw dislocation, Peierls stress Peierls barrier, free energy gradient.
Introduction Dislocation motion plays a important role in the mechanical behavior of bulk metals, and the Peierls stress and barrier are critical factors in determining the dislocation motion [1,2].
The size of the dislocation core is typically ten to several tens of atomic spacings, and thus the Peierls stress and barrier are intrinsically affected by the discrete atomic nature.
The dislocation migration is affected by the atomic configuration both in and around the dislocation core because of the stress field of the dislocation.
This temperature dependence may affect the mechanical properties of bcc iron.
Introduction Dislocation motion plays a important role in the mechanical behavior of bulk metals, and the Peierls stress and barrier are critical factors in determining the dislocation motion [1,2].
The size of the dislocation core is typically ten to several tens of atomic spacings, and thus the Peierls stress and barrier are intrinsically affected by the discrete atomic nature.
The dislocation migration is affected by the atomic configuration both in and around the dislocation core because of the stress field of the dislocation.
This temperature dependence may affect the mechanical properties of bcc iron.
Online since: November 2012
Authors: Carmen Galán-Marín, Carlos Rivera-Gómez
Some researches studied the influence of chemical degradation effects on mechanical properties: flexural and compressive strength of polymer mortars.
It is difficult to obtain high molecular weight orthophtalic polyester and for this reason, the chemical and mechanical properties of this material are inferior to those of isophtalic polyester.
We intended to detect whether it has some influence or not on other properties of the material such as its behavior under fire [21].
Vipulanandan, Mechanical Properties and Water Diffusion in Polyester Polymer Concrete, Journal of Engineering Mechanics, (1995) 1359-1365
Properties and uses of polymers in concrete.
It is difficult to obtain high molecular weight orthophtalic polyester and for this reason, the chemical and mechanical properties of this material are inferior to those of isophtalic polyester.
We intended to detect whether it has some influence or not on other properties of the material such as its behavior under fire [21].
Vipulanandan, Mechanical Properties and Water Diffusion in Polyester Polymer Concrete, Journal of Engineering Mechanics, (1995) 1359-1365
Properties and uses of polymers in concrete.
Online since: April 2011
Authors: Wei Sheng Li, Li Ming Yu
Structure noise of marine gearbox seriously affects warship’s concealment, stability of transmission system and amenity of crew working environment.
(a) Geometric model (b) Grid model (c) Finite element model boundary conditions Fig.1 Box model Determine unit types and material properties.
After meshing in HyperMesh, set material properties, designate materials of planetary reduction gear box alloy steel according to provided information.
The specific material parameters are on the basis of mechanical design manual, which is Q235.In order to prevent too great a variation of amplitude in harmonic analysis resonance conditions, considering the material loss factor of Q235, the material properties are as shown in Table 1.
Table 1 Material properties of planetary reduction gear box Material Elastic Modulus (MPa) Poisson’s ratio Density (t/mm3) limit of yielding intensity (MPa) loss factor Q235 2.0e5 0.3 7.8e-9 235 2e-4 Modal Analysis of Reduction Gear Box.
(a) Geometric model (b) Grid model (c) Finite element model boundary conditions Fig.1 Box model Determine unit types and material properties.
After meshing in HyperMesh, set material properties, designate materials of planetary reduction gear box alloy steel according to provided information.
The specific material parameters are on the basis of mechanical design manual, which is Q235.In order to prevent too great a variation of amplitude in harmonic analysis resonance conditions, considering the material loss factor of Q235, the material properties are as shown in Table 1.
Table 1 Material properties of planetary reduction gear box Material Elastic Modulus (MPa) Poisson’s ratio Density (t/mm3) limit of yielding intensity (MPa) loss factor Q235 2.0e5 0.3 7.8e-9 235 2e-4 Modal Analysis of Reduction Gear Box.
Online since: November 2015
Authors: Andrzej Buchacz, Andrzej Baier, Michał Majzner, Michał Sobek, Łukasz Grabowski
Introduction
In the design process of electric race cars, which main objective of the races is car economy, one of the most important factors affecting achieved result is aerodynamic quality of the car’s body shape.
The aim of the study was the Kammback effect, that allows to improve the aerodynamic properties of vehicles shapes.
This effect allows to shorten the body in relation to the original shape without worsen aerodynamic properties of shape.
The first model was a solid, which was the ideal shape in terms of aerodynamic (Fig. 1), which aerodynamic properties are described in the literature [3, 4].
For virtual aerodynamic tunnel proper properties of air were initialized.
The aim of the study was the Kammback effect, that allows to improve the aerodynamic properties of vehicles shapes.
This effect allows to shorten the body in relation to the original shape without worsen aerodynamic properties of shape.
The first model was a solid, which was the ideal shape in terms of aerodynamic (Fig. 1), which aerodynamic properties are described in the literature [3, 4].
For virtual aerodynamic tunnel proper properties of air were initialized.
Online since: June 2013
Authors: Yi Pai Jiang, Yan Xiu Wang
The Nanomaterials exposure pathway is also an important factor.
In such a small scale, the classical theory is no longer applicable, quantum effects (quantum effect) have become a factor cannot be ignored.
Coupled with significant increase in the proportion on the surface area of the material showing the physical, chemical and biological properties different from the macroscopic scale.
Nano exterior paint mainly uses the of nanomaterials binary synergistic the lotus leaf mechanism, the use of very low surface tension, adhesion ability and high hardness and toughness, aimed at strengthening the external walls of self-cleaning, anti-dust anti-dirt adhesion, UV resistance and gloss retention and color retention and other properties.
Textiles are capable of storing energy while retaining the mechanical properties of the fabric.
In such a small scale, the classical theory is no longer applicable, quantum effects (quantum effect) have become a factor cannot be ignored.
Coupled with significant increase in the proportion on the surface area of the material showing the physical, chemical and biological properties different from the macroscopic scale.
Nano exterior paint mainly uses the of nanomaterials binary synergistic the lotus leaf mechanism, the use of very low surface tension, adhesion ability and high hardness and toughness, aimed at strengthening the external walls of self-cleaning, anti-dust anti-dirt adhesion, UV resistance and gloss retention and color retention and other properties.
Textiles are capable of storing energy while retaining the mechanical properties of the fabric.
Online since: November 2012
Authors: Dao Yuan Pan, Xiang Gao, Chang Gao Xia, Hua Ding
Therefore, the design of power-train vibration isolation system directly affects the NVH performance.
In general, one definite power-train’s physical parameter will not change easily, so we can only optimize the physical parameter of mounting component geometry and physical properties [6].
Chinese Journal of Mechanical Engineering. 2005, 41(4): 49-54
Mechanical Systems and Signal Processing, 2010, 24: 2198-2209
Analysis of powertrain mounts with focus on torque roll axis decoupling and frequency dependent properties[D].
In general, one definite power-train’s physical parameter will not change easily, so we can only optimize the physical parameter of mounting component geometry and physical properties [6].
Chinese Journal of Mechanical Engineering. 2005, 41(4): 49-54
Mechanical Systems and Signal Processing, 2010, 24: 2198-2209
Analysis of powertrain mounts with focus on torque roll axis decoupling and frequency dependent properties[D].
Online since: December 2011
Authors: Dong Fang Li, Min Young Hwang, Yong Gyun Kim, Chung Hwan Jeon, Ju Hun Song, Yong Tae Kim, Youn Han Chang
It is also studied that 15% or more CO2 mol fraction could affect to proper formation of LiCoO2 through TGA-DSC analysis.
There are two kinds of factors which influence crystal structure and the one is temperature and the other is partial pressure of O2 and CO2, the product as is seen in the reaction formula.
A saga is made with porous ceramic material with 26% porosity, a heater is made with SIC heating element and inside of a calcination furnace was applied with firebrick properties.
Antolini, “LiCoO2:formation,structure,lithiumandoxygennonstoichiometry, electrochemical behavior and transport properties“ Solid state ionics 170(2004) [4] E.Plichta, M.
Bulhoes, " Structure and electrochemical properties of LiCoO2 prepared by combustion synthesis", Solid state Ionics, Vol. 158,91-102(2003) [11] C.
There are two kinds of factors which influence crystal structure and the one is temperature and the other is partial pressure of O2 and CO2, the product as is seen in the reaction formula.
A saga is made with porous ceramic material with 26% porosity, a heater is made with SIC heating element and inside of a calcination furnace was applied with firebrick properties.
Antolini, “LiCoO2:formation,structure,lithiumandoxygennonstoichiometry, electrochemical behavior and transport properties“ Solid state ionics 170(2004) [4] E.Plichta, M.
Bulhoes, " Structure and electrochemical properties of LiCoO2 prepared by combustion synthesis", Solid state Ionics, Vol. 158,91-102(2003) [11] C.
Online since: June 2013
Authors: Juan Wang, Si Yu Lai
The formula of industrial welding material is directly related to their physical properties, in order to study the relationship between the two factors.
The quality of welding material is affected by many factors, and there are complex interactions and nonlinear effects among these factors, and the functional form of this relationship is unknown in advance.
Work out the best combination of the impact factors according to the given performance indices
The analysis module supplies 2D and 3D analysis function which enables users obtain the correlation of the factors and index.
Discussion on Application of CAD Technology in Mechanical Design [J].
The quality of welding material is affected by many factors, and there are complex interactions and nonlinear effects among these factors, and the functional form of this relationship is unknown in advance.
Work out the best combination of the impact factors according to the given performance indices
The analysis module supplies 2D and 3D analysis function which enables users obtain the correlation of the factors and index.
Discussion on Application of CAD Technology in Mechanical Design [J].