Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: November 2012
Authors: Mojtaba Dehghan Manshadi, Mohamad Kazemi Esfeh
The signal from the amplifier will increase the bridge voltage and hence will affect on the sensor.
It should be noted that the term (Tw-Ta) and physical properties of fluid are dependent on the ambient temperature.
In other word the variations of physical properties of fluid and Nusselt number are ignored.
For example, Lundström et al. [5] claim that it was necessary to evaluate the fluid properties at the air temperature and their results show that evaluating the properties at the flim temperature is not enough to achieve a temperature independent colibration low.
It should be noted that by increasing the air temperature, the fluid properties will be changed and these changes have to be taken into consideration.
It should be noted that the term (Tw-Ta) and physical properties of fluid are dependent on the ambient temperature.
In other word the variations of physical properties of fluid and Nusselt number are ignored.
For example, Lundström et al. [5] claim that it was necessary to evaluate the fluid properties at the air temperature and their results show that evaluating the properties at the flim temperature is not enough to achieve a temperature independent colibration low.
It should be noted that by increasing the air temperature, the fluid properties will be changed and these changes have to be taken into consideration.
Online since: September 2019
Authors: Hakan Kaleli̇, Selman Demi̇rtaş, Zulhicce Tanriseven, Veli Uysal
Tribological Properties of New Developed Nano Boric Acid Suspended as Additive in Engine Oil
Hakan KALELİ1,a*, Selman DEMİRTAŞ1,b, Veli UYSAL1,c
and Zulhicce TANRISEVEN2,d
1Yıldız Technical University, Faculty of Mechanical Engineering, Automotive Division 34349 İstanbul / TURKEY
2Tribor Arge Co.
It is well known that nanoparticles affect the interaction between lubricants and surfaces with various chemical compositions and different chemical and physical properties.
In particular, the factor that has the greatest impact on mechanical efficiency is friction within the engine.
These lubricants, such as boric acid, have excellent lubrication properties without requiring expensive disposal techniques.
Kalam: Tribological Properties and Lubricant Mechanism of Nanoparticle in Engine Oil, Procedia Engineering Vol. 68 (2013 ), p. 320-325
It is well known that nanoparticles affect the interaction between lubricants and surfaces with various chemical compositions and different chemical and physical properties.
In particular, the factor that has the greatest impact on mechanical efficiency is friction within the engine.
These lubricants, such as boric acid, have excellent lubrication properties without requiring expensive disposal techniques.
Kalam: Tribological Properties and Lubricant Mechanism of Nanoparticle in Engine Oil, Procedia Engineering Vol. 68 (2013 ), p. 320-325
Online since: November 2015
Authors: Paula Łada, Katarzyna Konopka, Marta Bartnik, Aleksandra Miazga
The selected physical properties of the green body and sintered ZrO2-Ti composites were determined by Archimedes method.
Preparation of composites is interesting due to the possibility of controlling various properties of material.
The increase of the fracture toughness by introducing metal particles into the ceramic matrix depends on many factors.
All of these values determine the shape factors: particle elongation, curvature of grain boundary and convexity.
The titanium powder is characterized by greater values of shape factors, up to 1.6.
Preparation of composites is interesting due to the possibility of controlling various properties of material.
The increase of the fracture toughness by introducing metal particles into the ceramic matrix depends on many factors.
All of these values determine the shape factors: particle elongation, curvature of grain boundary and convexity.
The titanium powder is characterized by greater values of shape factors, up to 1.6.
Online since: July 2011
Authors: Quan Shui Chen, Ju Gong Zheng, Guang Yuan Ren
HLW not only has high radioactivity, longer half-life, but also produce a lot of decay heat, these heat is main influence factors to HLW repository, especially for stability and safety of engineering barrier.
In general, decay heat will cause temperature increasing up to about 100˚C, which probably effect structure and properties of buffer material, so thermal conduction of the buffer, namely compacted bentonite blocks, is very important.
In order to discussing thermal properties change pattern of compacted bentonite blocks in situ of HLW disposal repository, advancing domestic HLW disposal level, thermal conduction equipments of compacted bentonite blocks are designed, it is designed according to the conceptual model of HLW geological disposal repository, and using the equipments, the thermal conduction performance of compacted Na-bentonite from inner mongolia GMZ has studied.
As the buffer material, in order to play its role effectively of slowing down radionuclide migration, accelerating the decay heat conduction, homogenizing the pressure from host rock, closing the fracture of host rock, mitigating the mechanical damage and so on, bentonite must be compacted into a certain density blocks.
However, multilayers heat insulation is used, internal temperature change of the system is affected by external temperature after a long time.
In general, decay heat will cause temperature increasing up to about 100˚C, which probably effect structure and properties of buffer material, so thermal conduction of the buffer, namely compacted bentonite blocks, is very important.
In order to discussing thermal properties change pattern of compacted bentonite blocks in situ of HLW disposal repository, advancing domestic HLW disposal level, thermal conduction equipments of compacted bentonite blocks are designed, it is designed according to the conceptual model of HLW geological disposal repository, and using the equipments, the thermal conduction performance of compacted Na-bentonite from inner mongolia GMZ has studied.
As the buffer material, in order to play its role effectively of slowing down radionuclide migration, accelerating the decay heat conduction, homogenizing the pressure from host rock, closing the fracture of host rock, mitigating the mechanical damage and so on, bentonite must be compacted into a certain density blocks.
However, multilayers heat insulation is used, internal temperature change of the system is affected by external temperature after a long time.
Online since: May 2011
Authors: Bao Min Wang, Kai Song
China. (1) Research of the mechanical properties of construction formwork and the concrete mix ratio of construction formwork.
(5) Research of the cracking properties of construction formwork concrete.
Li Peng [17] used the Ansys software to conduct simulation research of the basic physical properties of construction formwork concrete shear walls, showing the reinforcement ratio of hook braces, the reinforcement ratio of vertical distribution and the effects of axial compression on the mechanical properties of the wall.
The China Academy of Building Research conducted a more systematic research of the mechanical properties of Type I and Type II DP formwork concrete shear walls [18].
[19] Yuanhong He: Dipy construction formwork concrete shear wall mechanical properties experimental analysis and design research [D].
(5) Research of the cracking properties of construction formwork concrete.
Li Peng [17] used the Ansys software to conduct simulation research of the basic physical properties of construction formwork concrete shear walls, showing the reinforcement ratio of hook braces, the reinforcement ratio of vertical distribution and the effects of axial compression on the mechanical properties of the wall.
The China Academy of Building Research conducted a more systematic research of the mechanical properties of Type I and Type II DP formwork concrete shear walls [18].
[19] Yuanhong He: Dipy construction formwork concrete shear wall mechanical properties experimental analysis and design research [D].
Online since: June 2012
Authors: Cheng Zhang, Wu Kui Zhao, Quan Shi, Tie Lin Liu
The structure complexity and function variability of integrated electronic information system result in the fact that its damage evaluation index includes multinomial factors.
In order to establish the evaluation index system, factors inflecting integrated electronic information system comprehensively are selected on basis of analyzing the function requirement of it.
Define the evaluation factor set as, where represents all kinds of effective factors in index system of integrated electronic information system, which can be derived from its function index system.
Each-level factors’ judgement matrix are constructed firstly to deciding the weighting of each factor.
The matrix has consistency property as, .
In order to establish the evaluation index system, factors inflecting integrated electronic information system comprehensively are selected on basis of analyzing the function requirement of it.
Define the evaluation factor set as, where represents all kinds of effective factors in index system of integrated electronic information system, which can be derived from its function index system.
Each-level factors’ judgement matrix are constructed firstly to deciding the weighting of each factor.
The matrix has consistency property as, .
Online since: September 2014
Authors: Ren Bo Song, Yong Jin Wang, Peng Wang, Ya Ping Li
Sloping plate angle and sloping plate length can affect the shear strength and shear time of the flow alloy on the sloping plate and thus influence alloy microstructure.
A better understanding of structural changes during rapid quenching from the semi-solid state is not only important for the characterization of thixotropic properties, but also enables targeted structural design to optimize mechanical and physical properties.
In addition, Mean equivalent diameter is D=2(A/π)1/2; Shape factor is F=4πA/L2.
Accordingly, the microstructure has relatively high shape factor and fine grains with the shape factor of 0.72 , the equivalent diameter of 52.45μm, so the slurry is more ideal.
The mean equivalent diameter and the shape factor of primary austenite is 50.8μm and 0.69; The thickness of carbide network reaches 5.12μm.
A better understanding of structural changes during rapid quenching from the semi-solid state is not only important for the characterization of thixotropic properties, but also enables targeted structural design to optimize mechanical and physical properties.
In addition, Mean equivalent diameter is D=2(A/π)1/2; Shape factor is F=4πA/L2.
Accordingly, the microstructure has relatively high shape factor and fine grains with the shape factor of 0.72 , the equivalent diameter of 52.45μm, so the slurry is more ideal.
The mean equivalent diameter and the shape factor of primary austenite is 50.8μm and 0.69; The thickness of carbide network reaches 5.12μm.
Online since: November 2005
Authors: Fu Zhen Xuan, Shan Tung Tu
In British Standard BS 5500 and
ASME Section VIII Div.1, the temperatures at which time dependent properties must be considered
are tabulated for generic material chemistry.
Previous studies show that failure of high temperature component is a combination of material and structural factors such as multiaxial stress state.
Therefore the choice of oσ does not affect the results of refσ .
The conventional method for calculation of creep fracture parameter of welded structures is simply based on the consumption that the welded structure is made of a homogeneous material with the lowest mechanical properties among those of the base material, weld material and heat affected zone (HAZ).
The proposed model has the same geometrical dimensions with the original one but without weld and thus it has different material properties.
Previous studies show that failure of high temperature component is a combination of material and structural factors such as multiaxial stress state.
Therefore the choice of oσ does not affect the results of refσ .
The conventional method for calculation of creep fracture parameter of welded structures is simply based on the consumption that the welded structure is made of a homogeneous material with the lowest mechanical properties among those of the base material, weld material and heat affected zone (HAZ).
The proposed model has the same geometrical dimensions with the original one but without weld and thus it has different material properties.
Online since: June 2008
Authors: Oleg Sitdikov, Rustam Kaibyshev, Yoshimi Watanabe, Elena Avtokratova
These materials exhibit mechanical and physical properties, which are out of the ordinary and
of great interest, in particular their remarkable strength and toughness and their potential for
superplasticity at low temperatures [e.g. 1-3].
A respectable amount of works [4-7] has also been focused to date on the effect of UFG structures on fatigue properties, as well as on the fundamental aspects of the behavior of UFG materials under cyclic loading conditions.
On the other hand, the fatigue crack growth behavior still remains least studied among other mechanical properties of UFG materials.
This suggests that while in the near-threshold region, the fatigue crack growth behavior is influenced by the microstructural factors, the crack growth in the present UFG material at relatively large ∆K may occur to be insensitive to the grain size.
The other important factor that can significantly affect the crack resistance of the present material is the presence of the second phase particles in the material structure [15].
A respectable amount of works [4-7] has also been focused to date on the effect of UFG structures on fatigue properties, as well as on the fundamental aspects of the behavior of UFG materials under cyclic loading conditions.
On the other hand, the fatigue crack growth behavior still remains least studied among other mechanical properties of UFG materials.
This suggests that while in the near-threshold region, the fatigue crack growth behavior is influenced by the microstructural factors, the crack growth in the present UFG material at relatively large ∆K may occur to be insensitive to the grain size.
The other important factor that can significantly affect the crack resistance of the present material is the presence of the second phase particles in the material structure [15].
Online since: September 2013
Authors: T.V.V.L.N. Rao, Mokhtar Awang, Mohd Rizal Lias
There are many factors influence misalignment between meshing of gears.
One major describes these factors as over press fitting when the gear is mounted onto the shaft as an interference hub fit.
Significant analysis in gear strength properties will follow with the achievements in computational design, simulation of meshing, and tooth contact analysis [7].
In actual condition, most of the component assemblies fitting, e.g. shaft of gear, driven to slave gears, etc. will affect to the misalignment error due to tolerance, transmission, machining, assembly errors and others parameter related [10].
Babalik, "Dynamic Analysis of Involute Spur Gears With Asymmetric Teeth," International Journal of Mechanical Sciences, vol. 50, pp. 1598-1610, December 2008
One major describes these factors as over press fitting when the gear is mounted onto the shaft as an interference hub fit.
Significant analysis in gear strength properties will follow with the achievements in computational design, simulation of meshing, and tooth contact analysis [7].
In actual condition, most of the component assemblies fitting, e.g. shaft of gear, driven to slave gears, etc. will affect to the misalignment error due to tolerance, transmission, machining, assembly errors and others parameter related [10].
Babalik, "Dynamic Analysis of Involute Spur Gears With Asymmetric Teeth," International Journal of Mechanical Sciences, vol. 50, pp. 1598-1610, December 2008