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Online since: July 2012
Authors: You Xi Lin, Fu Shan He, Wei Xie
Developed bamboo fiber reinforced composites have excellent friction and wear properties and good stability.
The tribological properties of brake pads are determined by three aspects: internal factors, friction and wear mechanism and external factors, including velocity, pressure, wet and dry conditions, braking frequency and braking duration etc., corresponding to extreme conditions like high speed, overlap, the rain and snow, and long downhill etc., which are confirmed as the main cause of road accidents.
Blau and McLaughlin reported that material properties play a dominant role in the dry behaviour while fluid dynamics play a major role in the wet behaviour[7].
As is shown in Fig. 3, wear properties of sample and counterpart are quite different between dry and wet friction conditions.
These two factors make high-speed wear rate larger.
The tribological properties of brake pads are determined by three aspects: internal factors, friction and wear mechanism and external factors, including velocity, pressure, wet and dry conditions, braking frequency and braking duration etc., corresponding to extreme conditions like high speed, overlap, the rain and snow, and long downhill etc., which are confirmed as the main cause of road accidents.
Blau and McLaughlin reported that material properties play a dominant role in the dry behaviour while fluid dynamics play a major role in the wet behaviour[7].
As is shown in Fig. 3, wear properties of sample and counterpart are quite different between dry and wet friction conditions.
These two factors make high-speed wear rate larger.
Online since: May 2014
Authors: Lu Ming Shen, Katherine McDonell, Gwénaëlle Proust
Nanotube reinforced composites show enhanced mechanical properties with a broad range of potential applications [2].
As such, a balance between structural damage and cross linking and their impact on mechanical properties is required [6].
This suggests that atom selection and site specific factors are important [19, 3].
The ring bond morphology could have a greater potential for the improvement of mechanical properties than linear bonding.
Kaski, Mechanical properties of carbon nanotubes with vacancies and related defects, Phys.
As such, a balance between structural damage and cross linking and their impact on mechanical properties is required [6].
This suggests that atom selection and site specific factors are important [19, 3].
The ring bond morphology could have a greater potential for the improvement of mechanical properties than linear bonding.
Kaski, Mechanical properties of carbon nanotubes with vacancies and related defects, Phys.
Online since: June 2012
Authors: De Cai Li, Wen Ming Yang, Hai Na Zhang, Xin Zhi He
Experimental Study on the Second-order Buoyancy of
Magnetic Fluid
He Xinzhi1,2 Li Decai2,b Yang Wenming2 Zhang Haina2
1School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China
2 School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
bdcli@bjtu.edu.cn
Keyword: Magnetic Fluid, Buoyancy, Fluid Statics
Abstract.
And the rule describes factors affecting the levitation force under the same condition [13].
However, the measurement of the radial levitation force suffered by the cylindrical magnet which immersed in the magnetic fluid has not been reported, so as to the influence factors.
The radial second-order levitation force suffered by the cylindrical magnet which immersed in the magnetic fluid was measured by experiment in this paper, and the influence factors were analyzed as well.
The influences on the value of levitation force made by the above factors are discussed by the experiments in this paper.
And the rule describes factors affecting the levitation force under the same condition [13].
However, the measurement of the radial levitation force suffered by the cylindrical magnet which immersed in the magnetic fluid has not been reported, so as to the influence factors.
The radial second-order levitation force suffered by the cylindrical magnet which immersed in the magnetic fluid was measured by experiment in this paper, and the influence factors were analyzed as well.
The influences on the value of levitation force made by the above factors are discussed by the experiments in this paper.
Online since: October 2019
Authors: Usuki Hiroshi, Takashi Inoue, Ikeuchi Kouji, Masahiro Hagino
However, because of the influence of this residual stress, such problems as reduction of dimensional accuracy by deformation after processing and deterioration caused by a change in mechanical properties occur [1].
Trial runs of face milling were performed by varying one of the process factors at a time to determine the range of each factor.
The final mathematical model terms of actual factors as determined by the Design-Expert software are shown in Eqs. (1)-(4).
The perturbation plot helps to compare the effect of all factors at a particular point in the design space.
In the case of more than one factor, this type of display could be used to find those factors that most affect the response [9].
Trial runs of face milling were performed by varying one of the process factors at a time to determine the range of each factor.
The final mathematical model terms of actual factors as determined by the Design-Expert software are shown in Eqs. (1)-(4).
The perturbation plot helps to compare the effect of all factors at a particular point in the design space.
In the case of more than one factor, this type of display could be used to find those factors that most affect the response [9].
Online since: February 2011
Authors: Jing Wang, Xu Nuan Hao, Xiao Wei Gao, Jian Jun Sha
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: April 2015
Authors: Peng Cheng Ma, Di Zhang, Lin Zhong Zhuang, Ji Shan Zhang
Mechanical properties.
Fig. 2 Tensile properties of annealed Al-Mg-Cu Fig. 3 Effect of Cu content on the n̄, r̄ and alloys with different Cu content Δr values of Al-Mg-Cu alloys On the other hand, the mechanical properties are comparable along different directions for the same alloy.
Conclusion In this work, the mechanical properties, formability and serrated yielding behaviors of Al-Mg-Cu alloys have been investigated, in connection with different Cu contents.
Morris, The effect of Mg precipitation on the mechanical properties of 5xxx aluminum alloys.
Zhou, Mechanical properties and formability of an Mg-6%Li-1%Zn alloy thin sheet at elevated temperatures, Journal of Materials Processing Technology. 206 (2008) 419-424
Fig. 2 Tensile properties of annealed Al-Mg-Cu Fig. 3 Effect of Cu content on the n̄, r̄ and alloys with different Cu content Δr values of Al-Mg-Cu alloys On the other hand, the mechanical properties are comparable along different directions for the same alloy.
Conclusion In this work, the mechanical properties, formability and serrated yielding behaviors of Al-Mg-Cu alloys have been investigated, in connection with different Cu contents.
Morris, The effect of Mg precipitation on the mechanical properties of 5xxx aluminum alloys.
Zhou, Mechanical properties and formability of an Mg-6%Li-1%Zn alloy thin sheet at elevated temperatures, Journal of Materials Processing Technology. 206 (2008) 419-424
Online since: March 2008
Authors: Min Li Zheng, Bin Jiang, Jia Liu, Chong Yu He
The periodic change in
cutting force and thickness of cut creates impact and vibration, which affects directly machining
quality, machining efficiency, and the reliability of high speed face milling cutter [1-3].
According to the property of the Dirac Function, Fx(t) and Fy(t) are transformed by Fourier Transform, the frequency spectrum functions of dynamic cutting forces in working plane are as follows dte(t)F(f)P πft2j x ox − +∞ ∞−∫ ⋅=
The number of cutter teeth participating in cutting, the rake of cutter, and cutting parameters are important factors affecting the frequency spectrum of dynamic cutting forces.
Tan: Chinese Journal of Mechanical Engineering Vol. 40 (2004), pp. 106 [3] H.
Zheng: Chinese Journal of Mechanical Engineering Vol. 37 (2001), pp. 109 [6] M.Y.
According to the property of the Dirac Function, Fx(t) and Fy(t) are transformed by Fourier Transform, the frequency spectrum functions of dynamic cutting forces in working plane are as follows dte(t)F(f)P πft2j x ox − +∞ ∞−∫ ⋅=
The number of cutter teeth participating in cutting, the rake of cutter, and cutting parameters are important factors affecting the frequency spectrum of dynamic cutting forces.
Tan: Chinese Journal of Mechanical Engineering Vol. 40 (2004), pp. 106 [3] H.
Zheng: Chinese Journal of Mechanical Engineering Vol. 37 (2001), pp. 109 [6] M.Y.
Online since: August 2009
Authors: Ya Dong Gong, J. Cheng, Jian Qiu, Yue Ming Liu
Cheng4
School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China,
1
qiujian1981@126.com, 2 gongyd@mail.neu.edu.cn
Keywords: Quick-point grinding, Grinding force, Material removal rate, Chip formation mechanism
Abstract.
It is found the grinding force is influenced by the factors such as cutting depth, wheel velocity, grinding angle as well as equivalent diameter, respectively.
(3) Modeling Quick-point Grinding Force In continuous grinding process, workpiece deformation caused by grinding force is a main factor that affects grinding accuracy.
Where W is the normal load, is the contact area, and 0A τ and η are coefficients which are determined by physical and mechanical properties of contact zone [2].
Separating the workpiece velocity on the plane of grinding wheel, a mathematical model among the three factors is built to analyze the grinding mechanism.
It is found the grinding force is influenced by the factors such as cutting depth, wheel velocity, grinding angle as well as equivalent diameter, respectively.
(3) Modeling Quick-point Grinding Force In continuous grinding process, workpiece deformation caused by grinding force is a main factor that affects grinding accuracy.
Where W is the normal load, is the contact area, and 0A τ and η are coefficients which are determined by physical and mechanical properties of contact zone [2].
Separating the workpiece velocity on the plane of grinding wheel, a mathematical model among the three factors is built to analyze the grinding mechanism.
Online since: October 2016
Authors: M. Fakkir Mohamed, B. Praveen Kumar, P.L. Madhavan, M. Pradeep
Effect of Process Parameters on Performance Measures in CNC Turning Using One Factor at a Time Approach for SS304
M.
Storage tanks and tankers accustomed transport fruit crush and alternative food are usually product of stainless-steel, due to its corrosion resistance and antibacterial drug properties.
Titanium nitride TIN generally called “Tinite” or “TiNite” or “TiN”.It is a very exhausting ceramic material, typically used as a coating for metallic element alloys, steel, carbide, and metallic element components to enhance the surface properties of substrates.
No Speed(rpm) Feed(mm/rev) Depth of cut(mm) SR (µm) MRR (mm3/min) 1 3 1 1 3.199 10760.86 2 3 1 2 3.432 20625 3 3 1 3 3.626 29117.64 4 3 2 1 5.243 12692.30 5 3 2 2 5.396 24750 6 3 2 3 5.660 35357.14 7 3 3 1 7.771 14558.82 8 3 3 2 8.361 30937.5 9 3 3 3 8.597 41250 3.2 Grey Relational Analysis 3.2.1 Multi-Response Model Using GRA The relationship between the assorted factors (Material Removal Rate, Tool Feed Rate, Surface Roughness etc.), is form of unclear.
Ø Feed was found to be the most influencing factor in CNC turning process followed by Speed and Depth of Cut.
Storage tanks and tankers accustomed transport fruit crush and alternative food are usually product of stainless-steel, due to its corrosion resistance and antibacterial drug properties.
Titanium nitride TIN generally called “Tinite” or “TiNite” or “TiN”.It is a very exhausting ceramic material, typically used as a coating for metallic element alloys, steel, carbide, and metallic element components to enhance the surface properties of substrates.
No Speed(rpm) Feed(mm/rev) Depth of cut(mm) SR (µm) MRR (mm3/min) 1 3 1 1 3.199 10760.86 2 3 1 2 3.432 20625 3 3 1 3 3.626 29117.64 4 3 2 1 5.243 12692.30 5 3 2 2 5.396 24750 6 3 2 3 5.660 35357.14 7 3 3 1 7.771 14558.82 8 3 3 2 8.361 30937.5 9 3 3 3 8.597 41250 3.2 Grey Relational Analysis 3.2.1 Multi-Response Model Using GRA The relationship between the assorted factors (Material Removal Rate, Tool Feed Rate, Surface Roughness etc.), is form of unclear.
Ø Feed was found to be the most influencing factor in CNC turning process followed by Speed and Depth of Cut.
Online since: November 2018
Authors: Merdaci Slimane
Effects of the exponent graded and porosity factors are investigated.
The present theory satisfies equilibrium conditions at the plate’s top and bottom faces without using shear correction factors.
The material properties of the FG plate, such as Young’s modulus E, are assumed to be function of the volume fraction of constituent materials.
The above power-law assumption reflects a simple rule of mixtures used to obtain the effective properties of the ceramic-metal plate.
The law of the modified mixture covering the porosity phases is used to roughly describe the properties of FGM plates with porosity.
The present theory satisfies equilibrium conditions at the plate’s top and bottom faces without using shear correction factors.
The material properties of the FG plate, such as Young’s modulus E, are assumed to be function of the volume fraction of constituent materials.
The above power-law assumption reflects a simple rule of mixtures used to obtain the effective properties of the ceramic-metal plate.
The law of the modified mixture covering the porosity phases is used to roughly describe the properties of FGM plates with porosity.