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Online since: August 2011
Authors: Zhi Jun Yang, Robert Kelly, Xin Chen
This paper performs a numerical investigation of a micro-electro-mechanical-system (MEMS) based capacitive viscometer.
First, the fluid property of the polymer solution is estimated using relaxation time estimation.
Introduction Viscosity is one of the important physical properties of liquids.
Since the viscosity of a liquid can vary according to other physical properties such as temperature and pressure.
The flow type of polymer solution Till recently, fluid dynamics has been very difficult to simulate due to its complexity, and one of the factor is the unknown flow types.
First, the fluid property of the polymer solution is estimated using relaxation time estimation.
Introduction Viscosity is one of the important physical properties of liquids.
Since the viscosity of a liquid can vary according to other physical properties such as temperature and pressure.
The flow type of polymer solution Till recently, fluid dynamics has been very difficult to simulate due to its complexity, and one of the factor is the unknown flow types.
Online since: April 2022
Authors: Antonio Occhiuzzi, Antonio Bonati, Annalisa Franco, Erika Grasso
The effectiveness of externally bonded systems under harsh environments is also a key concern [17-22], in order to determine environmental conversion factors for design purposes.
A summary of fabric properties is reported in Table 1.
Properties of materials.
Properties of specimens
In addition, the retained tensile mechanical properties of the systems after the examination periods were the key factors to determine the influence of the long-term loading on the resistance of the IMC system.
A summary of fabric properties is reported in Table 1.
Properties of materials.
Properties of specimens
In addition, the retained tensile mechanical properties of the systems after the examination periods were the key factors to determine the influence of the long-term loading on the resistance of the IMC system.
Online since: February 2014
Authors: Chih Chung Lai, Cherng Shing Lin, Ming En Wu, Chia Chun Yu
Factors at the scene of the fire were explored such as smoke spread and changes in temperature.
The high carbon monoxide (CO) concentration and temperatures, and low smoke layer height caused low visibility levels, impeding firefighting and rescue operations at the fire scene; thus, these factors were explored.
The field commander must assess the circumstances at the scene to determine which firefighting tactics are appropriate considering the aforementioned factors
Visibility could have been improved by using smoke control equipment, but restricting factors at the scene (e.g., high temperatures) exacerbated the search for the origin point.
If factors at the scene (i.e., high temperatures, high CO concentration levels, and low gas layer height) result in low visibility levels, impeding rescue efforts, ventilation tactics should be employed instead.
The high carbon monoxide (CO) concentration and temperatures, and low smoke layer height caused low visibility levels, impeding firefighting and rescue operations at the fire scene; thus, these factors were explored.
The field commander must assess the circumstances at the scene to determine which firefighting tactics are appropriate considering the aforementioned factors
Visibility could have been improved by using smoke control equipment, but restricting factors at the scene (e.g., high temperatures) exacerbated the search for the origin point.
If factors at the scene (i.e., high temperatures, high CO concentration levels, and low gas layer height) result in low visibility levels, impeding rescue efforts, ventilation tactics should be employed instead.
Online since: December 2016
Authors: Li Guang Yang, Yan Li, Jin Juan Fu
Contents of peak current, pulse on time, duty cycle, and servo voltage were the main factors, and each factor was endowed three levels.
However, the machinability of superalloy is generally considered to be poor due to several inherent properties including low thermal conductivity, rapid work hardening, ability to react with tool materials under atmospheric conditions, formation of built-up edge, weld to cutting edges and presence abrasive carbides in their microstructure [2].
The EDM is a complex combination of electrical, fluidic and mechanical process.
Among the process parameters, electric parameters are important factors.
Fig. 2 directly reveals the effects of the test factors on MRR.
However, the machinability of superalloy is generally considered to be poor due to several inherent properties including low thermal conductivity, rapid work hardening, ability to react with tool materials under atmospheric conditions, formation of built-up edge, weld to cutting edges and presence abrasive carbides in their microstructure [2].
The EDM is a complex combination of electrical, fluidic and mechanical process.
Among the process parameters, electric parameters are important factors.
Fig. 2 directly reveals the effects of the test factors on MRR.
Online since: February 2014
Authors: Xiao Zhang, Su Juan Zhang
This affects the thermal performance of power devices seriously and makes the working temperature of power devices too high to work normally and causes multifarious questions [1,3].
The results of the present study focus on impacts of different solder voids’ area and distribution on thermal properties and thermal resistance of power devices[2,4].
Chiriac et.al, have won some achievements on impacts of solder voids on PQFN package devices’ thermal and mechanical characteristics [1].
In general, the uppermost influence factor of power devices cooling is the solder voids under active region.
Chiriac and Youmin Yu: Impacts of Solder Voids on PQFN Packages’ Thermal and Mechanical Performances (2010)
The results of the present study focus on impacts of different solder voids’ area and distribution on thermal properties and thermal resistance of power devices[2,4].
Chiriac et.al, have won some achievements on impacts of solder voids on PQFN package devices’ thermal and mechanical characteristics [1].
In general, the uppermost influence factor of power devices cooling is the solder voids under active region.
Chiriac and Youmin Yu: Impacts of Solder Voids on PQFN Packages’ Thermal and Mechanical Performances (2010)
Online since: April 2008
Authors: Jun Tao, Tian Cang Zhang, Peng Tao Liu, Jing Li, Yu Mang
With
thermal- mechanical coupling technique, and considering the geometrical non-linearity, the material
property non-linearity and the interface frictional non-linearity, a Finite Element Model (FEM) of
temperature, stress and deformation fields were constructed.
(3) The transfer coefficient between input mechanical power and heat power doesn't change with temperature
(4) Thermal and mechanical properties of the materials change with temperature
For such a highly nonlinear heat-deformation process, a thermo-mechanical coupled analysis must be applied.
Chinese Journal of Mechanical Engineering, 2004, 40(6): 144-148 (in Chinese) [4] Mark R D, Nei W B.
(3) The transfer coefficient between input mechanical power and heat power doesn't change with temperature
(4) Thermal and mechanical properties of the materials change with temperature
For such a highly nonlinear heat-deformation process, a thermo-mechanical coupled analysis must be applied.
Chinese Journal of Mechanical Engineering, 2004, 40(6): 144-148 (in Chinese) [4] Mark R D, Nei W B.
Online since: February 2012
Authors: Fang Jia, Min Tang
Introduction
The press is a kind of mechanical equipment with automatic feeding device and can process the sheet metal in high efficiency and precision.
It is known that the thermal error has become a main restrictive factor affecting the press’s speed and precision.
The material of the rod is QT600-3 and the thermo-physical properties of the material are given in Table 1.
Table 1 Thermo-physical properties of QT600-3 Density(kg/m3) 7200 Poisson ratio 0.286 Elastic modulus (N/m2) 1.69×1011 Thermal conductivity(W/(m·K)) 36 Specific heat capacity(J/(kg·K)) 439.6 Thermal expansion coefficient(1/K) 1.09×10-5 With the thermal boundary conditions applied to the FEA model of the connecting rod above, the temperature field of the connecting rod with 5 hours of continuous operation is examined via transient thermal analysis.
Journal of Mechanical Engineering Science, vol. 225(2011), p. 186-193
It is known that the thermal error has become a main restrictive factor affecting the press’s speed and precision.
The material of the rod is QT600-3 and the thermo-physical properties of the material are given in Table 1.
Table 1 Thermo-physical properties of QT600-3 Density(kg/m3) 7200 Poisson ratio 0.286 Elastic modulus (N/m2) 1.69×1011 Thermal conductivity(W/(m·K)) 36 Specific heat capacity(J/(kg·K)) 439.6 Thermal expansion coefficient(1/K) 1.09×10-5 With the thermal boundary conditions applied to the FEA model of the connecting rod above, the temperature field of the connecting rod with 5 hours of continuous operation is examined via transient thermal analysis.
Journal of Mechanical Engineering Science, vol. 225(2011), p. 186-193
Online since: November 2011
Authors: Hua Ding, Ying Li Guo, Yi Han, Yan Shang
Effective factors such as the different distribution of microstructure, the volume fraction of hard phase and the yield stress ratio between single-phase hard phase steel with single-phase ferrite steel in multiphase steel are discussed in this work.
Their useful properties are controlled by adjusting the type, size, fraction and spatial distribution of the different phases[9].
The elastic-plastic analysis with the finite element method (FEM) will give a lot of useful information about the mechanical properties of multiphase steel [10-12].
Therefore, the FEM used in this work is correct, which can be used for further simulation to analyze the affecting factors and discuss the distribution of micro-stress and strain of the multiphase steel.
Therefore, the finite element method (FEM) used in this work is correct and can be used for further simulation to analyze the effect of factors and discuss the distribution of micro-stress and strain of the multiphase steel
Their useful properties are controlled by adjusting the type, size, fraction and spatial distribution of the different phases[9].
The elastic-plastic analysis with the finite element method (FEM) will give a lot of useful information about the mechanical properties of multiphase steel [10-12].
Therefore, the FEM used in this work is correct, which can be used for further simulation to analyze the affecting factors and discuss the distribution of micro-stress and strain of the multiphase steel.
Therefore, the finite element method (FEM) used in this work is correct and can be used for further simulation to analyze the effect of factors and discuss the distribution of micro-stress and strain of the multiphase steel
Online since: October 2014
Authors: Yu Jun Zhang
These theories in different periods and different extent play a positive role in controlling the water inrush from coal floor for control, but these methods consider not comprehensive enough, failed to reveal the relationship among factors and water inrush.
Thus the floor failure and the development of confined water flowing and roof first weighting and periodic weighting step distance are closely related, mine pressure and water pressure is maximum influence of confined water rising height of the main factors, especially the pressure of the water.
Aggregate accounted for a larger proportion of the material, is the object of cementing material cementation, its physical and mechanical properties have an important effect on the properties of similar materials.
Cement is the dominant nature of similar material, the mechanical properties of the material mechanical properties similar to a great extent, cementing materials commonly used in the main gypsum, cement, lime, calcium carbonate, kaolin, paraffin, sawdust, etc..
Table.3 Physical and mechanical properties of rock 2.2 Similar results analysis 1) along with the working face advancing, roof and floor is gradually destroyed.
Thus the floor failure and the development of confined water flowing and roof first weighting and periodic weighting step distance are closely related, mine pressure and water pressure is maximum influence of confined water rising height of the main factors, especially the pressure of the water.
Aggregate accounted for a larger proportion of the material, is the object of cementing material cementation, its physical and mechanical properties have an important effect on the properties of similar materials.
Cement is the dominant nature of similar material, the mechanical properties of the material mechanical properties similar to a great extent, cementing materials commonly used in the main gypsum, cement, lime, calcium carbonate, kaolin, paraffin, sawdust, etc..
Table.3 Physical and mechanical properties of rock 2.2 Similar results analysis 1) along with the working face advancing, roof and floor is gradually destroyed.
Online since: February 2006
Authors: Ai Bing Yu, A.J. Wang, C.G. Luan, S.F. Chen
Bonds of electroplated diamond tools are investigated through the studies of
microstructures and properties.
Bond of electroplated diamond tool is an important factor to affect the machining behaviors of diamond tools.
Among three bonds, the bright nickel coating shows smallest grains and will have better mechanical properties.
Hardness is an important property of bond, and directly affects the wear-resistance of electroplated diamond tool.
Usually, coarse grains of bond will result in the lower mechanical properties.
Bond of electroplated diamond tool is an important factor to affect the machining behaviors of diamond tools.
Among three bonds, the bright nickel coating shows smallest grains and will have better mechanical properties.
Hardness is an important property of bond, and directly affects the wear-resistance of electroplated diamond tool.
Usually, coarse grains of bond will result in the lower mechanical properties.