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Online since: February 2012
Authors: Zhao Xi Li, Xue Jie Liu, Hui Ling Jia
Introduction
Owing to its high melting point, high hardness, good toughness and stable chemical properties, the VN coating has a very wide range of applications and long-term prospects[1].
The Chinese Geyang Li’s research group creates a series of nano-multilayer of VN/SiO2[6] and AlN/VN[7] in the multi-target sputtering instrument, and studies their microstructures, mechanical and antiwear properties using the transmission electron microscope, microhardness tester and precise dimple grinder.
It can clearly be seen that the best process parameter can’t be reoccurred accurately and quantitatively because of many random factors.
It indicates that VN is a conductor with good metal properties.
As the distribution of the DOS of Si atoms is very uniform and relatively lower, the distribution trend of total DOS was less affected.
The Chinese Geyang Li’s research group creates a series of nano-multilayer of VN/SiO2[6] and AlN/VN[7] in the multi-target sputtering instrument, and studies their microstructures, mechanical and antiwear properties using the transmission electron microscope, microhardness tester and precise dimple grinder.
It can clearly be seen that the best process parameter can’t be reoccurred accurately and quantitatively because of many random factors.
It indicates that VN is a conductor with good metal properties.
As the distribution of the DOS of Si atoms is very uniform and relatively lower, the distribution trend of total DOS was less affected.
Online since: December 2013
Authors: Nor Hafiez Mohamad Nor, Muhammad Hussain Ismail, Nur Atikah Abu Kasim, N. Muhamad, M.A. Taib
There are various factors influencing the MIM process.
The selection of appropriate powder and binder system, mixing of the powder and the binder system and its viscosity will affect the product.
This study will focus on what are the characterization and rheological properties of the stainless steel 316L based feedstock.
Table 3 Rheological properties of the ready-made SS316L feedstock Temperature, T (˚C) Apparent viscosity, η˳ (Pa.s) Flow behaviour index, n Activation Energy, E(kJ) Moldability/Rheological index, αSTV 170 146.642 0.61 73.4 301.26 175 78.308 0.83 73.4 245.91 180 93.178 0.66 73.4 413.34 185 92.150 0.61 73.4 479.41 190 78.428 0.60 73.4 577.74 Conclusion The characterization and rheological properties of stainless steel 316L has been investigated thoroughly.
Amin, Khairur Rijal Jamaludin, and Norhamidi Muhamad, Rheological properties of SS316L MIM feedstock prepared with different particle sizes and powder loadings, Journal - The Institution of Engineers, Malaysia, 71 (2009) 74-86
The selection of appropriate powder and binder system, mixing of the powder and the binder system and its viscosity will affect the product.
This study will focus on what are the characterization and rheological properties of the stainless steel 316L based feedstock.
Table 3 Rheological properties of the ready-made SS316L feedstock Temperature, T (˚C) Apparent viscosity, η˳ (Pa.s) Flow behaviour index, n Activation Energy, E(kJ) Moldability/Rheological index, αSTV 170 146.642 0.61 73.4 301.26 175 78.308 0.83 73.4 245.91 180 93.178 0.66 73.4 413.34 185 92.150 0.61 73.4 479.41 190 78.428 0.60 73.4 577.74 Conclusion The characterization and rheological properties of stainless steel 316L has been investigated thoroughly.
Amin, Khairur Rijal Jamaludin, and Norhamidi Muhamad, Rheological properties of SS316L MIM feedstock prepared with different particle sizes and powder loadings, Journal - The Institution of Engineers, Malaysia, 71 (2009) 74-86
Online since: June 2014
Authors: Andreas Öchsner, Resam Makvandi
In order to study the effects caused by geometrical and material factors, such as aspect ratio, volume fraction, interface stiffness and thickness on the composites mechanical properties, Tserpes and Chanteli [5] used a homogenized representative volume element (RVE).
They also concluded that just low values of the aspect ratio (aspect ratio of 20 and below that) affect these properties, while the interface effect is significant in lateral directions.
Huang and Rodrigue [8] studied the strain rate and the orientation of nanotubes effects on the mechanical properties of the reinforced composites.
The interaction between the reinforcement phase and the matrix phase in a composite is one of the important factors in studying the behavior of composite materials.
Rodrigue, The effect of carbon nanotube orientation and content on the mechanical properties of polypropylene based composites, Mater.
They also concluded that just low values of the aspect ratio (aspect ratio of 20 and below that) affect these properties, while the interface effect is significant in lateral directions.
Huang and Rodrigue [8] studied the strain rate and the orientation of nanotubes effects on the mechanical properties of the reinforced composites.
The interaction between the reinforcement phase and the matrix phase in a composite is one of the important factors in studying the behavior of composite materials.
Rodrigue, The effect of carbon nanotube orientation and content on the mechanical properties of polypropylene based composites, Mater.
Online since: May 2011
Authors: Xiao Peng Li, Tao Li, Ze Liang Duan, Bang Chun Wen
The material properties between the pile and the soil are quite different, and the tensile properties of the soil are very poor, so the unit of the pile-soil interface is chosen.
F=Fs+F0sinωt (1) (6) The Material Properties of the pile and the soil.
As follows: Table 1 Material properties of the pile materials elastic modulus E[Mpa] poisson ratio density ρ[kg/m3] radius d[m] length L[m] metal post 0.3 7800 0.1 10 Table 2 Material properties of the soil materials soil hickness H[m] compression modulus Ec[Mpa] poisson ratio agglutinating powerc c[kPa] internal friction angle expansive angle density ρ[kg/m3] clay1 1.5 16 0.29 18.9 12.8 18 1450 loose clay 1.5 20 0.29 30.4 22 15 1760 clay2 7 26 0.3 68.7 22.8 17.5 1850 The establishment and simulation of the pile-soil simulation model.
The frictional factor of the pile-soil system changes when the angle of friction changes.
Effect of Pile Installation on Static and Dynamic Soil Properties.
F=Fs+F0sinωt (1) (6) The Material Properties of the pile and the soil.
As follows: Table 1 Material properties of the pile materials elastic modulus E[Mpa] poisson ratio density ρ[kg/m3] radius d[m] length L[m] metal post 0.3 7800 0.1 10 Table 2 Material properties of the soil materials soil hickness H[m] compression modulus Ec[Mpa] poisson ratio agglutinating powerc c[kPa] internal friction angle expansive angle density ρ[kg/m3] clay1 1.5 16 0.29 18.9 12.8 18 1450 loose clay 1.5 20 0.29 30.4 22 15 1760 clay2 7 26 0.3 68.7 22.8 17.5 1850 The establishment and simulation of the pile-soil simulation model.
The frictional factor of the pile-soil system changes when the angle of friction changes.
Effect of Pile Installation on Static and Dynamic Soil Properties.
Online since: June 2013
Authors: Yan Chao Ma, Yan Lian Pan, Ying Hui Chen, Shuai Wang, Qing Shui Liu
Introduction
In urban areas, excavation engineering danger can cause serious life and property loss because of complex conditions such as surrounding buildings, structures, transport, roads, municipal pipelines.
For the unique properties of soft soil, such as high compressibility, low strength, moisture content, so unreasonable supporting design of the foundation pit will cause excessive displacement foundation of supporting structure, excessive surrounding surface subsidence and excessive swell of foundation-pit bottom, thereby affects the pit stability.
When dividing the units, the distribution of groundwater level, soil, support position, excavation depth and other factors should be considered enough and the axial force, bending moment and shear force and the displacement of each node of retaining structure can be obtained.
Table1 Physical and mechanical parameters of soils Number Type of soil layer Layerthickness[m] [kN·m3] C[kPa] Φ [deg] 1 2 3 4 clay soil clay soil muddy soil powdered soil 1.00 2.00 15.60 >10 18.2 19.2 17.6 19.6 12.00 12.00 8.2 23.60 10.00 17.00 9.33 14.97 Analysis of effect of soil reinforcement on the supporting structure The effects of soil reinforcement inside of the foundation can be reflected by the value of m.
The physical and mechanical parameters of the reinforced soil increase with the value of m, the value of m of reinforced soil is 6MN/m4.
For the unique properties of soft soil, such as high compressibility, low strength, moisture content, so unreasonable supporting design of the foundation pit will cause excessive displacement foundation of supporting structure, excessive surrounding surface subsidence and excessive swell of foundation-pit bottom, thereby affects the pit stability.
When dividing the units, the distribution of groundwater level, soil, support position, excavation depth and other factors should be considered enough and the axial force, bending moment and shear force and the displacement of each node of retaining structure can be obtained.
Table1 Physical and mechanical parameters of soils Number Type of soil layer Layerthickness[m] [kN·m3] C[kPa] Φ [deg] 1 2 3 4 clay soil clay soil muddy soil powdered soil 1.00 2.00 15.60 >10 18.2 19.2 17.6 19.6 12.00 12.00 8.2 23.60 10.00 17.00 9.33 14.97 Analysis of effect of soil reinforcement on the supporting structure The effects of soil reinforcement inside of the foundation can be reflected by the value of m.
The physical and mechanical parameters of the reinforced soil increase with the value of m, the value of m of reinforced soil is 6MN/m4.
Online since: December 2016
Authors: Xiang Shen, Zhong Min Xie, Yong Quan Deng, Song Ji
Among these techniques, computational simulation has become a prevalent tool to study mechanical properties of stent [11-13].
The large stent deformation is mainly relied on the plastic deformation and its material properties has entered into the nonlinear phase.
The mechanical properties of the material were as follows: the Young’s modulus: 201 GPa and Poisson's ratio: 0.3.
So it could be seen that the connector shape greatly affects the LSS.
Therefore, it could not only satisfy the LSS but also ensure others properties of the stent to achieve design optimization.
The large stent deformation is mainly relied on the plastic deformation and its material properties has entered into the nonlinear phase.
The mechanical properties of the material were as follows: the Young’s modulus: 201 GPa and Poisson's ratio: 0.3.
So it could be seen that the connector shape greatly affects the LSS.
Therefore, it could not only satisfy the LSS but also ensure others properties of the stent to achieve design optimization.
Online since: October 2016
Authors: Bernhard Jakoby
A dedicated chemical sensor would employ a chemical interface which selectively reacts with (or adsorbs) the targeted substance and changes its physical properties (e.g., its mass due to adsorption).
The reason for this supposedly lies in the adverse properties of macroscopic measurement approaches, i.e. relatively large heating powers and large response times.
Vellekoop, Physical Sensors for Liquid Properties, IEEE Sensors Journal, vol. 11, no. 12, pp. 3076-3085, Dec. 2011, doi: 10.1109/JSEN.2011.2167716 [7] B.
Sensing liquid properties with thickness-shear mode resonators, Sensors and Actuators A: Physical 1994; 44; 209-218
Sensing liquid properties with thickness-shear mode resonators, Sensors and Actuators A: Physical 1994; 44; 209-218
The reason for this supposedly lies in the adverse properties of macroscopic measurement approaches, i.e. relatively large heating powers and large response times.
Vellekoop, Physical Sensors for Liquid Properties, IEEE Sensors Journal, vol. 11, no. 12, pp. 3076-3085, Dec. 2011, doi: 10.1109/JSEN.2011.2167716 [7] B.
Sensing liquid properties with thickness-shear mode resonators, Sensors and Actuators A: Physical 1994; 44; 209-218
Sensing liquid properties with thickness-shear mode resonators, Sensors and Actuators A: Physical 1994; 44; 209-218
Online since: August 2014
Authors: Ning He, Wei Zhao, Yin Fei Yang, Liang Li, Long Hui Meng
Introduction
Metal cutting is a severe plastic deformation process with high temperature, high pressure, high strain rate, and is also affected by thermal stress and phase transformation [1], and there will be residual stresses induced by machining in the surface layers.
Titanium and its alloys are widely used in aerospace field because of their light density, high strength, good resistance to corrosion and high temperature [2], but the residual stresses will seriously affect the dimensional accuracy and service performance of the workpieces [3].
The formation of the residual stresses’ final state will go through two steps: 1, the formation of the surface residual stresses induced by many factors during the process of machining; 2, the residual stresses will be redistributed to get a self-balanced state.
The size and shape of the workpiece will seriously affect the self-balanced result.
(a) The unmachined workpiece (b) the machined workpiece Fig.3 The workpiece before and after machining 3.2 Chemical Milling Here hydrofluoric acid was chosen as the corrosive as it can accelerated corrosion, and nitric acid was chosen as oxidant as it can inhibit the production of hydrogen to improve the property of the milled surface [11]. 704 silicone was used to protect the surfaces that don’t need to be corroded.
Titanium and its alloys are widely used in aerospace field because of their light density, high strength, good resistance to corrosion and high temperature [2], but the residual stresses will seriously affect the dimensional accuracy and service performance of the workpieces [3].
The formation of the residual stresses’ final state will go through two steps: 1, the formation of the surface residual stresses induced by many factors during the process of machining; 2, the residual stresses will be redistributed to get a self-balanced state.
The size and shape of the workpiece will seriously affect the self-balanced result.
(a) The unmachined workpiece (b) the machined workpiece Fig.3 The workpiece before and after machining 3.2 Chemical Milling Here hydrofluoric acid was chosen as the corrosive as it can accelerated corrosion, and nitric acid was chosen as oxidant as it can inhibit the production of hydrogen to improve the property of the milled surface [11]. 704 silicone was used to protect the surfaces that don’t need to be corroded.
Online since: January 2012
Authors: Hui Zhong Luo, Jin Jun Xu, Jun Liu, Ke Yu Wang, Yan Zhang
The choice of material properties: the modulus of stone is 5.0Gpa and Poisson's ratio is 0.27; the modulus of filler is 1.25Gpa and Poisson's ratio is 0.3 [4,5].
The key indicator of structural dynamic properties is the size of its fundamental frequency.
This effect may be largely due to the suspension line structure and the suspension line arch provides a greater role in the mechanical properties of stiffness.At the same time I found higher stiffness of the basis due to the bridge is located in the rocks, Consolidation is better than the bridges of other regions located in Shaoxing where the mud presences.
At the top of arch Because there are many stone falls from the upper of arch, affecting the stiffness of the parts of the structure.
Remaining static mechanical properties and stability of the ancient bridge structure inYUqing.
The key indicator of structural dynamic properties is the size of its fundamental frequency.
This effect may be largely due to the suspension line structure and the suspension line arch provides a greater role in the mechanical properties of stiffness.At the same time I found higher stiffness of the basis due to the bridge is located in the rocks, Consolidation is better than the bridges of other regions located in Shaoxing where the mud presences.
At the top of arch Because there are many stone falls from the upper of arch, affecting the stiffness of the parts of the structure.
Remaining static mechanical properties and stability of the ancient bridge structure inYUqing.
Online since: December 2024
Authors: Eyad Hany Nasr, Waleed Zeiada, Ghazi G. Al-Khateeb, Alaa Sukkari, Mohammed Wajeeh Alani, Helal Ezzat
Introduction
Flexible Asphalt pavements face multiple distress forms during their service life due to traffic loading and environmental factors.
Asphalt Binder Properties.
Zycotherm Properties.
Rheological Properties Dynamic shear rheometers (DSRs) are used to measure the rheological properties of asphalt binders.
A review of the warm mix asphalt (WMA) technologies: Effects on thermo-mechanical and rheological properties.
Asphalt Binder Properties.
Zycotherm Properties.
Rheological Properties Dynamic shear rheometers (DSRs) are used to measure the rheological properties of asphalt binders.
A review of the warm mix asphalt (WMA) technologies: Effects on thermo-mechanical and rheological properties.