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Online since: February 2011
Authors: Xiao Bo Liu, Jia Chun Zhong, Hai Long Tang, Jian Yang
The melting flow properties, compatibility, thermal and mechanical properties were characterized by melting index test, dynamic mechanical analysis (DMA), thermal analysis, tensile test and the fracture suface morphologies.
Results and discussion Mechanical and thermal properties.
Table 1 demonstrates the relationship between composition ratio and the thermal as well as mechanical properties.
Mechanical properties (tensile strength and flexural strength) from the Table 1 showed there were only very small changes between the blends with different PPS loading.
The blends possessed both excellent thermal stability properties and mechanical properties.
Results and discussion Mechanical and thermal properties.
Table 1 demonstrates the relationship between composition ratio and the thermal as well as mechanical properties.
Mechanical properties (tensile strength and flexural strength) from the Table 1 showed there were only very small changes between the blends with different PPS loading.
The blends possessed both excellent thermal stability properties and mechanical properties.
Online since: March 2013
Authors: Jaeh Yun Choi, Kyu Sung Lee
The factors that affect construction difficulty in the every stage of construction are identified.
Then the PMIS can incorporate those factors by employing difficulty factors to each unit of piping.
The material ID represents each individual component registered in the model with the unique properties.
In other words, the initial estimate does not reflect the reality of construction sequence because it does not consider the other factors such as location of pipe spool or distance between pipes that affect the constructability beside physical characteristics of material.
The factors that affect constructability for each type of materials must be identified and considered to improve the accuracy of performance measurement and prediction of remaining work scope.
Then the PMIS can incorporate those factors by employing difficulty factors to each unit of piping.
The material ID represents each individual component registered in the model with the unique properties.
In other words, the initial estimate does not reflect the reality of construction sequence because it does not consider the other factors such as location of pipe spool or distance between pipes that affect the constructability beside physical characteristics of material.
The factors that affect constructability for each type of materials must be identified and considered to improve the accuracy of performance measurement and prediction of remaining work scope.
Online since: September 2016
Authors: Xiang Ling, Jin Chun Zhang, Shu Hua Lu
Thermal expansion coefficient of the cladding material and matrix and high temperature gradient are considered as the main factors [3-4].
Corrosion properties of in situ laser remelted NiCrBSi coatings comparison with hard chromium coatings, J.
Luo, Effects of high temperature treatment on microstructure and mechanical properties of laser-clad NiCrBSi/WC coatings on titanium alloy substrate, Mater.
Qu, et al., Effects of the thickness of the pre-placed layer on microstructural evolution and mechanical properties of the laser-clad coatings, J.
Awasthi, et al., Effect of specific energy input on microstructure and mechanical properties of nickel-base intermetallic alloy deposited by laser cladding, Metal.
Corrosion properties of in situ laser remelted NiCrBSi coatings comparison with hard chromium coatings, J.
Luo, Effects of high temperature treatment on microstructure and mechanical properties of laser-clad NiCrBSi/WC coatings on titanium alloy substrate, Mater.
Qu, et al., Effects of the thickness of the pre-placed layer on microstructural evolution and mechanical properties of the laser-clad coatings, J.
Awasthi, et al., Effect of specific energy input on microstructure and mechanical properties of nickel-base intermetallic alloy deposited by laser cladding, Metal.
Online since: October 2014
Authors: Andrey A. Gusakov, Artem S. Kosolapov, Dmitriy M. Markovich, Vladimir Y. Mityakov, Sergey A. Mozhayskiy, Alexander S. Nebuchinov, Sergey Z. Sapozhnikov, Andrey V. Mityakov
As far as plenty of flow properties are changing rapidly, it is important to know both heat transfer and flow properties in a certain location and at a certain time.
Flow properties in the vicinity of a heated circular cylinder and heat loss depend considerably on the Reynolds number, turbulence level, and other factors.
The operating principle of a GHFS [3] is based on a transverse Seebeck effect: when heat flux transits through a plate with anisotropy of thermophysical and thermoelectrical properties, the thermo-electromotive force occurs.
Cylinder was turning about an axis by the force of electro-mechanical drive.
Combined calibration of the GHFS and galvanometer was made by affecting on the GHFS by known beforehand heat flux.
Flow properties in the vicinity of a heated circular cylinder and heat loss depend considerably on the Reynolds number, turbulence level, and other factors.
The operating principle of a GHFS [3] is based on a transverse Seebeck effect: when heat flux transits through a plate with anisotropy of thermophysical and thermoelectrical properties, the thermo-electromotive force occurs.
Cylinder was turning about an axis by the force of electro-mechanical drive.
Combined calibration of the GHFS and galvanometer was made by affecting on the GHFS by known beforehand heat flux.
Online since: August 2013
Authors: Jie Zhang, Quan Yuan, Kun Qian, Miao Wang
Analysis on factors affect characteristic parameters of restoring force in the second seismic fortification line
Factors that affect bearing capacity of grid framework.
There are several factors affect bearing capacity of grid framework in structure[4]: number of grid beams and grid columns, dimensions, amount of steel bar, concrete grade, elastic modulus of filling materials, etc.
Altering different factors, we did the pushover analysis, set the ends of beam M3 and the ends of column PMM hinge.
By analyzing the factors that affect characteristic parameters of restoring force in the second seismic fortification line, we can figure out how the alteration of factors such as amount of steel bar in grid column, concrete grade, sectional dimensions and the mechanic performance of filling materials affect the characteristic parameters of restoring force, the results are shown below: 1.
Mechanical Property Study and Practical Oblique Section Design Method Study on Multi-Ribbed Composite Wall [Master's thesis].Xi’an.
There are several factors affect bearing capacity of grid framework in structure[4]: number of grid beams and grid columns, dimensions, amount of steel bar, concrete grade, elastic modulus of filling materials, etc.
Altering different factors, we did the pushover analysis, set the ends of beam M3 and the ends of column PMM hinge.
By analyzing the factors that affect characteristic parameters of restoring force in the second seismic fortification line, we can figure out how the alteration of factors such as amount of steel bar in grid column, concrete grade, sectional dimensions and the mechanic performance of filling materials affect the characteristic parameters of restoring force, the results are shown below: 1.
Mechanical Property Study and Practical Oblique Section Design Method Study on Multi-Ribbed Composite Wall [Master's thesis].Xi’an.
Online since: December 2012
Authors: Chao Wei Chang, Jen Chieh Chang, Tzu Chen Hung, Yung Shin Tseng
The input material properties of scroll expander were taken to be the same as experimental model.
The properties of measurement points were determined by thermodynamics theory.
The maximum deviation was around 17.5%, which might be mainly caused by the treatment of fluid properties.
Alternatively, expander geometry is also a factor to affect volumetric efficiency.
The laps of the expander geometry and rotation speed are also important factors to influence volumetric efficiency. 4.
The properties of measurement points were determined by thermodynamics theory.
The maximum deviation was around 17.5%, which might be mainly caused by the treatment of fluid properties.
Alternatively, expander geometry is also a factor to affect volumetric efficiency.
The laps of the expander geometry and rotation speed are also important factors to influence volumetric efficiency. 4.
Online since: April 2019
Authors: Atike Ince Yardimci, Hande Aypek, Ozgur Ozturk, Selahattin Yilmaz, Engin Ozcivici, Gulistan Mese, Yusuf Selamet
Electrospun fibrous scaffolds can be optimized in mechanical, chemical and degradative properties that can greatly influence their interaction with cells [4] and their high surface area and porosity provide attachment and migration of cells within the scaffold [5].
Carbon nanotubes (CNTs) have attracted considerable attention based on their excellent electrical and mechanical properties [18].
By incorporating CNTs to PPy, its electrical, mechanical and electrochemical properties can be improved, leading to increased actuation response and reduced actuation voltages [19, 20].
Similar effects of CNT incorporation on polyaniline fibers electrochemical properties was reported previously [37].
Increasing PPy and CNT addition decreased resistance and improved electrical properties of nanofibers.
Carbon nanotubes (CNTs) have attracted considerable attention based on their excellent electrical and mechanical properties [18].
By incorporating CNTs to PPy, its electrical, mechanical and electrochemical properties can be improved, leading to increased actuation response and reduced actuation voltages [19, 20].
Similar effects of CNT incorporation on polyaniline fibers electrochemical properties was reported previously [37].
Increasing PPy and CNT addition decreased resistance and improved electrical properties of nanofibers.
Online since: March 2015
Authors: Jie Duan, Yu Tong Liu, Wei Guo Cao
Because of the large size of the axle and its high inspection speed, sensors need to be put on the to gantry to inspect the axle’s parameters, and sensors’ accuracy is higher than, so the dynamic characteristics of the gantry is the one of the important factors.Therefore the parameters of modal frequencies and mode shapes analysis of gantry’s structure can be used to predict the effects on the accuracy of external stimulus, so as to avoid the resonance frequency of the structure through rational design.
It can ensure the overall quality, quality distribution we could simplify model appropriately[2].①Omit the little effect of part fillet corner on the vibration characteristics of the whole structure. ②Auxiliary hole with small aperture which has very little effect on the overall mechanical properties and can conveniently ignored the dots and nuts to simplify the model of mesh division and to ensure a high accuracy in order to install the accessories of machine tool. ③Reducing the number of units is to avoid putting forward higher requirements for the hardware and software of the computer equipment and consuming more computation time of the specific processing methods.
The model of gantry simplified is imported into ABAQUS software, with material properties, and meshing[3].
Mechanical Engineering and Automation, 140(2007) 73-74.
In Chinese [3] Haiming Gu, Mechanical Vibration Theory and Practical , Beijing, 2007.
It can ensure the overall quality, quality distribution we could simplify model appropriately[2].①Omit the little effect of part fillet corner on the vibration characteristics of the whole structure. ②Auxiliary hole with small aperture which has very little effect on the overall mechanical properties and can conveniently ignored the dots and nuts to simplify the model of mesh division and to ensure a high accuracy in order to install the accessories of machine tool. ③Reducing the number of units is to avoid putting forward higher requirements for the hardware and software of the computer equipment and consuming more computation time of the specific processing methods.
The model of gantry simplified is imported into ABAQUS software, with material properties, and meshing[3].
Mechanical Engineering and Automation, 140(2007) 73-74.
In Chinese [3] Haiming Gu, Mechanical Vibration Theory and Practical , Beijing, 2007.
Online since: July 2013
Authors: Peng Hai, Jin Bo Li, Lan Ma, Yi He
Polyesteramides (PEA) has both good heat resistance and degradability properties.
Polyesteramides has both good mechanical properties and degradability.
More than this concentration, the properties of the materials would decline [7].
There are many factors affected the degradation rate of PEA/MWNTs, The report related to nanocomposites’ degradation rate is more complex, some is conflicting [8,9].
Based on the discussion of the material preparation, there may be a chemical bond between MWNTs and PEA, chemical bond makes the material had good mechanical properties.
Polyesteramides has both good mechanical properties and degradability.
More than this concentration, the properties of the materials would decline [7].
There are many factors affected the degradation rate of PEA/MWNTs, The report related to nanocomposites’ degradation rate is more complex, some is conflicting [8,9].
Based on the discussion of the material preparation, there may be a chemical bond between MWNTs and PEA, chemical bond makes the material had good mechanical properties.
Online since: March 2010
Authors: Chen Guo, Zhi Xin Chen, De Hai Zhang
In many cases, boundary conditions are fairly complex, or the properties of the material itself
is very complex and even can not exactly know, or some indicators don't have an accurate
mathematical expression, and so on . [2] How to deal properly with these factors, make the analysis
results as possible as effective and viable, are some worth in-depth exploration questions.
As the properties of each component mismatch, resulting in partial or overall deformation behavior and fracture properties is very different with the single material.
Study on the Processing of Complex Material Properties When some special material properties still can not be accurately expressed by the existing parameters, in general it will be impossible for simulation analysis.
Such as the clad material, its performance does not only depend on the mechanical properties, geometric dimensions, loading patterns and environmental factors, but also related closely to the material forming methods, interface bonding performance, material properties differences between each component, size and thickness ratio and so on.
There are many parameters affect the material properties. [3] [4] Such as the difference of the both sides metal' Poisson's ratio and plastic strain ratio, result in the both sides metal strain of the width direction is inconsistent.
As the properties of each component mismatch, resulting in partial or overall deformation behavior and fracture properties is very different with the single material.
Study on the Processing of Complex Material Properties When some special material properties still can not be accurately expressed by the existing parameters, in general it will be impossible for simulation analysis.
Such as the clad material, its performance does not only depend on the mechanical properties, geometric dimensions, loading patterns and environmental factors, but also related closely to the material forming methods, interface bonding performance, material properties differences between each component, size and thickness ratio and so on.
There are many parameters affect the material properties. [3] [4] Such as the difference of the both sides metal' Poisson's ratio and plastic strain ratio, result in the both sides metal strain of the width direction is inconsistent.