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Online since: June 2010
Authors: Liang Chi Zhang, Mohammad Sharif Uddin
Introduction
Because of their excellent mechanical properties and good biocompatibility, ceramic balls for total
hip replacements (THR) have been widely used [1].
The taper-bore contact length H, as defined in Fig. 2, is important, which affects the stress distribution and mechanical reliability of a ceramic femoral head.
The interfacial characteristics such as friction is another factor which influences load transmission, and hence the stresses in a ceramic femoral head.
When the friction coefficient at this interface reaches 0.35, maximum tensile stress along the taper interface reduces by a factor of eight.
Of the Institution of Mechanical Engineers [H], Vol. 214 (2000), p.685 [11] G.
The taper-bore contact length H, as defined in Fig. 2, is important, which affects the stress distribution and mechanical reliability of a ceramic femoral head.
The interfacial characteristics such as friction is another factor which influences load transmission, and hence the stresses in a ceramic femoral head.
When the friction coefficient at this interface reaches 0.35, maximum tensile stress along the taper interface reduces by a factor of eight.
Of the Institution of Mechanical Engineers [H], Vol. 214 (2000), p.685 [11] G.
Online since: February 2011
Authors: Xiao Wei Gao, Jian Jun Sha, Xu Nuan Hao, Jing Wang
Tungsten (W) and Copper-alloy (CuCrZr) have been considered as the potential candidates for armor materials and heat sinking materials, respectively, due to their attractive nuclear and physical properties.
These physical properties make it to be attractive for using as a plasma facing material.
On the other hand, copper-alloy (CuCrZr) has been proposed as promising heat sinking materials due to its high thermal conductivity and good mechanical properties.
Based on the analysis of thermal history mentioned above, the thermally-induced residual stresses and the high brittleness of W make the bonding of W to CuCrZr really challenging and will certainly affect the microstructural and thermo-mechanical integrity of W/CuCrZr PFCs.
The thermo-mechanical analysis was carried out using temperature-dependent material properties provided by the ITER team [8].
These physical properties make it to be attractive for using as a plasma facing material.
On the other hand, copper-alloy (CuCrZr) has been proposed as promising heat sinking materials due to its high thermal conductivity and good mechanical properties.
Based on the analysis of thermal history mentioned above, the thermally-induced residual stresses and the high brittleness of W make the bonding of W to CuCrZr really challenging and will certainly affect the microstructural and thermo-mechanical integrity of W/CuCrZr PFCs.
The thermo-mechanical analysis was carried out using temperature-dependent material properties provided by the ITER team [8].
Online since: October 2012
Authors: Yung Chuan Chiou, Ru Yi He, Pai Chen Lin, Jong Ning Aoh, Bob Huang, Kent Dong, Tony Tang, Zheng Ming Su
The global and local stress intensity factors for finite kinked cracks, the stress intensity factors for finite transverse cracks, and the Paris law for fatigue crack propagation are used.
The global and local stress intensity factors for kinked cracks, the stress intensity factors for transverse cracks, and the Paris law for fatigue crack propagation are utilized in the model.
The accurate global and local stress intensity factors for finite kinked cracks in Lin et al. [8,9], the stress intensity factors for finite transverse cracks in Tada et al.[14], and the Paris law for fatigue crack propagation are utilized in the model.
Burford, Factors Affecting the Properties of Swept Friction Stir Welds, SAE Technical Paper, Society of Automotive Engineers, Detroit, (2008) 14-17
Pan, Stress Intensity Factors for Spot Welds and Associated Kinked Cracks in Cup Specimens, International Journal of Fatigue (2005) 81-98
The global and local stress intensity factors for kinked cracks, the stress intensity factors for transverse cracks, and the Paris law for fatigue crack propagation are utilized in the model.
The accurate global and local stress intensity factors for finite kinked cracks in Lin et al. [8,9], the stress intensity factors for finite transverse cracks in Tada et al.[14], and the Paris law for fatigue crack propagation are utilized in the model.
Burford, Factors Affecting the Properties of Swept Friction Stir Welds, SAE Technical Paper, Society of Automotive Engineers, Detroit, (2008) 14-17
Pan, Stress Intensity Factors for Spot Welds and Associated Kinked Cracks in Cup Specimens, International Journal of Fatigue (2005) 81-98
Online since: February 2014
Authors: Yun Tao Zhang, Xi Peng Li, Li Jiu Wang
Passive Strain Transfer Analysis of Wireless SAW Torque Sensor
Lijiu Wang 1, a *, Yuntao Zhang 2,b and Xipeng Li3,c
1 Key laboratory of Fundamental Science for Advanced Machining, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081,China
2 Key laboratory of Fundamental Science for Advanced Machining, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081,China
3 Key laboratory of Fundamental Science for Advanced Machining, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081,China
awanglijiu@bit.edu.cn, b176304129@qq.com, clixipeng2008@163.com
Keywords: Surface Acoustic Wave , FEA, strain transfer, passive wireless
Abstract.
Torque measurement based on the SAW technology has advantages of high measuring accuracy, fast response and passive wireless property, overcoming disadvantages of strain gauge measurement, grating measurement, etc.
There are many factors that affect the strain transfer.
By studying the relationship between these factors and strain transfer, we will provide a theoretical basis for optimizing the design of sensor structure.
Torque measurement based on the SAW technology has advantages of high measuring accuracy, fast response and passive wireless property, overcoming disadvantages of strain gauge measurement, grating measurement, etc.
There are many factors that affect the strain transfer.
By studying the relationship between these factors and strain transfer, we will provide a theoretical basis for optimizing the design of sensor structure.
Online since: July 2015
Authors: Noor Amira Sarani, Aeslina Abdul Kadir
The factors such as increasing of growing population, daily and industrial activities will lead to these phenomena.
The results demonstrated that, in terms of physical and mechanical properties, CB Brick (2.5%) at 1°C/min improved the most and leached low heavy metals.
According to the previous results of physical and mechanical properties, TCLP was conducted because CB Brick contains high heavy metals compared to Clay Brick (0% CBs).
In this stage, by comparing with different percentages of CBs, CB Brick (2.5%) at 1°C/min yields the optimal performance in terms of physical and mechanical properties of manufactured brick, and then it was selected to be tested for IAQ.
Engelenhoven, “Environmental Properties of Fly Ash Brick,” World of Coal Ash, USA, 2009
The results demonstrated that, in terms of physical and mechanical properties, CB Brick (2.5%) at 1°C/min improved the most and leached low heavy metals.
According to the previous results of physical and mechanical properties, TCLP was conducted because CB Brick contains high heavy metals compared to Clay Brick (0% CBs).
In this stage, by comparing with different percentages of CBs, CB Brick (2.5%) at 1°C/min yields the optimal performance in terms of physical and mechanical properties of manufactured brick, and then it was selected to be tested for IAQ.
Engelenhoven, “Environmental Properties of Fly Ash Brick,” World of Coal Ash, USA, 2009
Online since: April 2010
Authors: Joerg Pezoldt, Ivo W. Rangelow, Thomas Stauden, Manuel Hofer
Introduction
SiC is one representative of the wide band gap semiconductors, which already have been used in Si
based micromachining technology during processing and as an add on material to achieve an
improved processability and increased functionality of MEMS devices due to its mechanical
properties and chemical inertness.
Nanoelectromechanical systems provide, compared to MEMS, a range of intriguing properties, such as extremely high resonance frequencies, ultimate mass resolutions down to zeptogram [1] and high quality factors [2].
An improved quality factor in viscose damping media [6] can be expected at the same resonance frequency due to a higher ρSiCdSiC product.
The used growth technique allows the manipulation of the residual stress and inhomogeneous stress distribution [11] and therefore the MEMS properties [9].
The properties of the tempered HSQ are similar to silicon dioxide [12].
Nanoelectromechanical systems provide, compared to MEMS, a range of intriguing properties, such as extremely high resonance frequencies, ultimate mass resolutions down to zeptogram [1] and high quality factors [2].
An improved quality factor in viscose damping media [6] can be expected at the same resonance frequency due to a higher ρSiCdSiC product.
The used growth technique allows the manipulation of the residual stress and inhomogeneous stress distribution [11] and therefore the MEMS properties [9].
The properties of the tempered HSQ are similar to silicon dioxide [12].
Online since: April 2014
Authors: Xue Nan Zhang, Liu Qiao, Jia Liu, Zheng Liu, Yan Jun Wang, Yun Feng Wang, Hao Ping Shen
But cost is still the main factor, which restricts the PV development.
Main affecting factors of lifetime include crystal defects, impurity concentration and so on.
Many thermal donors will directly affect the properties of solar cell.
Although the cost at current is higher than CZ-Si, by optimizing growing conditions and mechanical structure of the stove to increasesilicon crystal output, the cost can be decreased greatly even lower than CZ-Si.
Main affecting factors of lifetime include crystal defects, impurity concentration and so on.
Many thermal donors will directly affect the properties of solar cell.
Although the cost at current is higher than CZ-Si, by optimizing growing conditions and mechanical structure of the stove to increasesilicon crystal output, the cost can be decreased greatly even lower than CZ-Si.
Online since: September 2010
Authors: Mohd Fazuri Abdullah, Muhammad Ilman Hakimi Chua Abdullah, Jaharah A. Ghani, Abu Bakar Sulong
Ghani e
Dept. of Mechanical & Material Engineering, Universiti Kebangsaan Malaysia, Bangi, Malaysia
a
faxury@yahoo.com.my, babubakar@eng.ukm.my,
ckimi_ilmn@yahoo.com, dchase@eng.ukm.my,
e
jaharah@eng.ukm.my
Keywords: Stainless steel; Surface roughness; Insert nose radius
Abstract.
Austenitic typed stainless steels mainly used because it can withstand operation at high temperature and higher corrosion resistance properties [1].
Surface roughness has affected by many factors like the cutting tool geometry, depth of cut, cutting speed, feed rate, the microstructure of work piece, the rigidity of the lathe [4].
If the value less than the confident interval, the factor are significant due to the response.
In the limits of test, the parameters affecting the average surface roughness are, in respect of importance, as the following: feed rate, insert radius and cutting speed.
Austenitic typed stainless steels mainly used because it can withstand operation at high temperature and higher corrosion resistance properties [1].
Surface roughness has affected by many factors like the cutting tool geometry, depth of cut, cutting speed, feed rate, the microstructure of work piece, the rigidity of the lathe [4].
If the value less than the confident interval, the factor are significant due to the response.
In the limits of test, the parameters affecting the average surface roughness are, in respect of importance, as the following: feed rate, insert radius and cutting speed.
Online since: December 2012
Authors: Chih Hung Chu, Wei Wen Wang, Hsin Hwa Chen, Wei Tan Sun, Jing Jenn Lin, Cheng Fu Yang
After applying the repeated hot-then-cold stresses to the post-irradiated Invar sheets, the springback factors are first restored to the value of fresh Invar, and then revert to an increasing trend.
Results and discussions We adopt the springback formula developed by Tseng et al to evaluate the mechanical springback behaviors of the Invar sheets [12, 13].
Unlike very high energy cosmic-charged particles in the GeV range (which most likely produce structural changes in the metal alloy), the moderate energy in the MeV range of gamma-ray ionizing radiation most seriously affects dielectric materials.
Further increasing the number of hot-then-cold cycles increasingly degraded the mechanical springback characteristics of the Invar sheets.
Lyman (ed), Metals Handbook, Vol.1, Properties and Selection of Metals, ASM, 8th edn. (1961) [2] D.L.
Results and discussions We adopt the springback formula developed by Tseng et al to evaluate the mechanical springback behaviors of the Invar sheets [12, 13].
Unlike very high energy cosmic-charged particles in the GeV range (which most likely produce structural changes in the metal alloy), the moderate energy in the MeV range of gamma-ray ionizing radiation most seriously affects dielectric materials.
Further increasing the number of hot-then-cold cycles increasingly degraded the mechanical springback characteristics of the Invar sheets.
Lyman (ed), Metals Handbook, Vol.1, Properties and Selection of Metals, ASM, 8th edn. (1961) [2] D.L.
Online since: April 2022
Authors: Shams Anwar, Faisal Khan, Ya Hui Zhang
This paper aims to study the electrochemical and mechanical properties of Zn-Ni alloy films deposited on steel substrates and suppress hydrogen evolution reaction by adding complexing agent (EDTA) and improving the corrosion resistance properties of Zn-Ni coatings.
The development of a stable plating bath is vital to electrodeposit Zn-containing coatings with suitable composition and microstructure, which leads to improving corrosion resistance and mechanical properties.
The heterogeneous factor demonstrates the preliminary surface irregularities.
A thicker deposition thickness enhances the corrosion resistance properties of the coatings.
Azizi, “Deposition potential effect on surface properties of Zn–Ni coatings,” Surf.
The development of a stable plating bath is vital to electrodeposit Zn-containing coatings with suitable composition and microstructure, which leads to improving corrosion resistance and mechanical properties.
The heterogeneous factor demonstrates the preliminary surface irregularities.
A thicker deposition thickness enhances the corrosion resistance properties of the coatings.
Azizi, “Deposition potential effect on surface properties of Zn–Ni coatings,” Surf.