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Online since: November 2015
Authors: Vaishal J. Banker, Jitendra M. Mistry
Also it is found that the speed was most significant parameter affecting frictional force.
Introduction Inconel and its alloys are widely used in gas turbines, evaporators, condensers, heat-exchangers, chemical processing plants and pressure vessels application as it sustains mechanical properties at high temperatures.
Due to the wear resistant property friction force behavior is an interested area in Inconel alloys.
Taguchi’s method of experimental design is an efficient way to determine the optimum factor level combinations to achieve a minimum standard deviation (variation) while keeping the mean on the target.
The input parameters (factors) which are considered in sliding wear are load, speed, wear track diameter and pin heating temperature have 3 levels each.
Introduction Inconel and its alloys are widely used in gas turbines, evaporators, condensers, heat-exchangers, chemical processing plants and pressure vessels application as it sustains mechanical properties at high temperatures.
Due to the wear resistant property friction force behavior is an interested area in Inconel alloys.
Taguchi’s method of experimental design is an efficient way to determine the optimum factor level combinations to achieve a minimum standard deviation (variation) while keeping the mean on the target.
The input parameters (factors) which are considered in sliding wear are load, speed, wear track diameter and pin heating temperature have 3 levels each.
Online since: August 2008
Authors: Chao Ming Lin, Chun Yi Chu, Wei Lin Chang
These characteristics describe the interrelationship between
the viscosity, the shear rate, and the temperature. m1 and m2 are the constants for the reaction order;
)exp( 111
RT
E
Ak −= and )exp( 222
RT
E
Ak −= are the rate parameters described by an Arrhenius
temperature dependency with A1 and A2 as pre-exponential factors; E1 and E2 are activation
energies.
When choosing the material to use as an underfill encapsulant, it is necessary to ensure that its physical properties are suitable.
Typical material properties include viscosity, thermal expansion, conversion, and elastic modulus.
The underfill encapsulant is assumed to be a viscous fluid material with the properties presented in Table 2.
The simulated results show that the flow front distribution in the different times can be affected by the bumps array arrangement (see fig. 6).
When choosing the material to use as an underfill encapsulant, it is necessary to ensure that its physical properties are suitable.
Typical material properties include viscosity, thermal expansion, conversion, and elastic modulus.
The underfill encapsulant is assumed to be a viscous fluid material with the properties presented in Table 2.
The simulated results show that the flow front distribution in the different times can be affected by the bumps array arrangement (see fig. 6).
BFRP Bars as an Alternative Reinforcement of Concrete Structures - Compatibility and Adhesion Issues
Online since: November 2015
Authors: Andrzej Garbacz, Marek Urbański, Andrzej Łapko
The presented value of elasticity modulus was estimated as a additives composite property taking into account volume fractions of basalt and carbon fibers their properties as well as properties of epoxy matrix.
In the ACI Manual, additionally some rules for selection are formulated: “If some properties of the repair material are greatly different from those of the substrate concrete, such as the coefficient of thermal expansion, other properties should compensate for these differences for the repair to perform successfully; for example, a lower modulus of elasticity to reduce thermal stresses”.
Many of the studies conducted so far show a fairly high complexity of factors and circumstances affecting the adhesion of FRP bars to concrete.
It was assumed that: concrete compressive strength equals fcm = 33MPa, tensile strength fctm = 2.6MPa and BFRP bar properties: tensile strength ff = 1100MPa, compressive strength ffc = 950MPa, tensile modulus Ef = 60GPa.
This model also enable the prediction of behavior the system: HFRP - concrete an checking the compatibility requirements that will not be met either at the stage of selection of HFRP properties or during the use of the concrete member.
In the ACI Manual, additionally some rules for selection are formulated: “If some properties of the repair material are greatly different from those of the substrate concrete, such as the coefficient of thermal expansion, other properties should compensate for these differences for the repair to perform successfully; for example, a lower modulus of elasticity to reduce thermal stresses”.
Many of the studies conducted so far show a fairly high complexity of factors and circumstances affecting the adhesion of FRP bars to concrete.
It was assumed that: concrete compressive strength equals fcm = 33MPa, tensile strength fctm = 2.6MPa and BFRP bar properties: tensile strength ff = 1100MPa, compressive strength ffc = 950MPa, tensile modulus Ef = 60GPa.
This model also enable the prediction of behavior the system: HFRP - concrete an checking the compatibility requirements that will not be met either at the stage of selection of HFRP properties or during the use of the concrete member.
Online since: August 2015
Authors: Triwikantoro Triwikantoro, Mochammad Zainuri, Darminto Darminto, Mashuri Mashuri, Sunaryono Sunaryono, Ahmad Taufiq, Suminar Pratapa
This ferrogel exhibited combination properties of magnetic fillers and elastic hydrogels.
Meanwhile, the quality of the structure refinement and solution is given by the R factor, which relates the observed and calculated structure factors.
There are two factors such as the pH and the energy transfer in this process that cause the change of particles size.
All magnetic properties increase with increasing particles size.
THE MAGNETIC PROPERTIES OF SAMPLES INCREASES WITH INCREASING PARTICLE SIZE.
Meanwhile, the quality of the structure refinement and solution is given by the R factor, which relates the observed and calculated structure factors.
There are two factors such as the pH and the energy transfer in this process that cause the change of particles size.
All magnetic properties increase with increasing particles size.
THE MAGNETIC PROPERTIES OF SAMPLES INCREASES WITH INCREASING PARTICLE SIZE.
Online since: May 2012
Authors: Yan Zhang, Yi Ni Guo, Jian Wang, Ye Huang
Water depth and wave
Water depth and wave that is the impact of offshore wind farm development is 2 important natural factor.
Water depth not only directly affect the base size and mass, and the influence of wave generat load.
Sea water corrosion Metals in seawater corrosion of external factors Metals in seawater by chemical factors, physical factors and biological factors and occurrence of damage.
Because the metal is in the grain boundary, the physical properties of inhomogeneous; actual metal material general contain some impurities, and chemical properties are not uniform; and the concentration of dissolved oxygen in seawater and seawater temperature, may not distributed uniformly.
Which unit failure, will not affect the other unit.
Water depth not only directly affect the base size and mass, and the influence of wave generat load.
Sea water corrosion Metals in seawater corrosion of external factors Metals in seawater by chemical factors, physical factors and biological factors and occurrence of damage.
Because the metal is in the grain boundary, the physical properties of inhomogeneous; actual metal material general contain some impurities, and chemical properties are not uniform; and the concentration of dissolved oxygen in seawater and seawater temperature, may not distributed uniformly.
Which unit failure, will not affect the other unit.
Online since: July 2015
Authors: M.Z. Kasron, Muhd Hafeez Bin Zainulabidin, Al Emran Ismail, A.S.M. Kassim, M.H.M. Yusuff
The combinations of materials have a significant influence on the sound absorption properties.
The two microphones transfer function method according to ISO 10534-2 standard was used to measure the materials sound absorption properties.
Seddeq (2009), Factors Influencing Acoustic Performance of Sound Absorptive Materials, Australian Journal of Basic and Applied Sciences, 3(4): 4610-4617
Umnova (2011), Acoustical Properties of Double Porosity Granular Materials, Journal of Acoustical Society of America, 130(5): 2765-2776
Swift (2001), The Effect of Consolidation on the Acoustic Properties of Loose Rubber Granulates, Applied Acoustics, 62(6): 665-690
The two microphones transfer function method according to ISO 10534-2 standard was used to measure the materials sound absorption properties.
Seddeq (2009), Factors Influencing Acoustic Performance of Sound Absorptive Materials, Australian Journal of Basic and Applied Sciences, 3(4): 4610-4617
Umnova (2011), Acoustical Properties of Double Porosity Granular Materials, Journal of Acoustical Society of America, 130(5): 2765-2776
Swift (2001), The Effect of Consolidation on the Acoustic Properties of Loose Rubber Granulates, Applied Acoustics, 62(6): 665-690
Online since: February 2014
Authors: Tao Wang, Xiao Jian Liu, Xiao Deng Yang, Hua Yong Zhang
The properties such as the electrical conductivity, flexural strength and density of the composite were tested.
The factors of graphite content, CF content which affected the properties of the composite were investigated.
The effect of CF content(wt%)on the properties of flexural strength, electrical conductivity and density were showed in Fig3.
The mechanical properties of carbon fiber is strong.
The interface bond of carbon fiber and PPS is better, and in the process of drag and press, PPS matrix deformes following the CF deformation.Therefore,the mechanical properties of composite can be significantly improved.
The factors of graphite content, CF content which affected the properties of the composite were investigated.
The effect of CF content(wt%)on the properties of flexural strength, electrical conductivity and density were showed in Fig3.
The mechanical properties of carbon fiber is strong.
The interface bond of carbon fiber and PPS is better, and in the process of drag and press, PPS matrix deformes following the CF deformation.Therefore,the mechanical properties of composite can be significantly improved.
Online since: December 2013
Authors: Kasigavi Chandrappa, Joel Hemanth
Chandrappa 1, a, Joel Hemanth 2, b
1Associate Professor and Research scholar, Department of Mechanical Engineering, Siddaganga Institute of Technology, Tumkur - 572 103, Karnataka, India
2Dean.
However, the properties of Ti and Cu have great differences in crystal structure, melting point, heat conductivity, and linear expansion coefficient.
Therefore, surface treatment and selection of bonding temperature and loading are basically important factors of the diffusion bonding process.
Other factors such as thermal conductivity, thermal expansion, and bonding environment also affect the bonding process, particularly at high bonding temperature.
Influence of microstructure of Ti-Al based alloy on the mechanical properties at elevated temperature [J].
However, the properties of Ti and Cu have great differences in crystal structure, melting point, heat conductivity, and linear expansion coefficient.
Therefore, surface treatment and selection of bonding temperature and loading are basically important factors of the diffusion bonding process.
Other factors such as thermal conductivity, thermal expansion, and bonding environment also affect the bonding process, particularly at high bonding temperature.
Influence of microstructure of Ti-Al based alloy on the mechanical properties at elevated temperature [J].
Online since: May 2015
Authors: Nur Izan Syahriah Hussein, S.R. Kamarul, Mohamad Nizam Ayof
However, the thermal effect of the cladding method and the consequent chemical reaction among the elements in the NiCrBSi-WC material need to be understood for optimizing the desired mechanical properties of the produced deposit.
The results found prove that the chemical reaction among the elements of the deposit is important to be understood to produce protective layers with a preferable combination of mechanical properties.
They also concluded that the size and the population of WC carbides in the matrix are the main factors affecting the wear resistance properties of the deposit.
Analyses are also conducted on the mechanical properties and the resulting microstructure of the deposited clads, and the thermal cycle produced by the process.
Janicki, The study of properties of Ni–WC wires surfaced deposits, J.
The results found prove that the chemical reaction among the elements of the deposit is important to be understood to produce protective layers with a preferable combination of mechanical properties.
They also concluded that the size and the population of WC carbides in the matrix are the main factors affecting the wear resistance properties of the deposit.
Analyses are also conducted on the mechanical properties and the resulting microstructure of the deposited clads, and the thermal cycle produced by the process.
Janicki, The study of properties of Ni–WC wires surfaced deposits, J.
Online since: May 2014
Authors: Thomas Nitschke-Pagel, Klaus Dilger
In components with high local residual stresses we have to consider different effects residual stresses may have on the properties of the component.
On the other hand it is assumed that high tensile residual stresses due to welding have a strong negative effect on the strength properties especially under fatigue loading.
The heat input has to be chosen according to recommendations given for the most high strength steels from the producers with the aim to guarantee good material properties.
The reason is, that the heat input can be varied on two different ways that is to say by affecting the cooling velocity and by affecting the grade of restraint because the ratio between the molten or heated zone and the cold material depends strongly on the heat conduction which is affected strongly by the welding speed.
;Wohlfahrt,H.: In "Mechanical Effects of Welding".
On the other hand it is assumed that high tensile residual stresses due to welding have a strong negative effect on the strength properties especially under fatigue loading.
The heat input has to be chosen according to recommendations given for the most high strength steels from the producers with the aim to guarantee good material properties.
The reason is, that the heat input can be varied on two different ways that is to say by affecting the cooling velocity and by affecting the grade of restraint because the ratio between the molten or heated zone and the cold material depends strongly on the heat conduction which is affected strongly by the welding speed.
;Wohlfahrt,H.: In "Mechanical Effects of Welding".