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Online since: April 2021
Authors: Eser Yarar, Alpay Tamer Erturk
Surface mechanical attrition treatment is a pre-stressing process that enhances the lifespan of mechanical parts.
Introduction Titanium and titanium alloys are light metals preferred in many areas due to their positive mechanical and physical properties (high strength, low density, good biocompatibility, low thermal conductivity, etc.).
Mechanical surface treatments such as shot peening (SP), ultrasonic shot peening (USP) are applied to alloys in order to improve these negative properties.
The friction between shot and target was selected as a friction coefficient factor of 0.25.
The mesh size of the area affected by the shot in the target material was chosen as 0.07 mm.
Introduction Titanium and titanium alloys are light metals preferred in many areas due to their positive mechanical and physical properties (high strength, low density, good biocompatibility, low thermal conductivity, etc.).
Mechanical surface treatments such as shot peening (SP), ultrasonic shot peening (USP) are applied to alloys in order to improve these negative properties.
The friction between shot and target was selected as a friction coefficient factor of 0.25.
The mesh size of the area affected by the shot in the target material was chosen as 0.07 mm.
Online since: December 2007
Authors: Suet To, Chi Fai Cheung, Wing Bun Lee, Tsz Chun Kwok
The effects of workpiece geometry, cutting mechanics, process factors, and the material
factors on surface roughness have been overlooked in most studies of surface generation in the FTS
machining of optical microstructures.
There is a need to develop deterministic models that take into account both the process and material factors in the generation of the surface.
Factors Affecting Surface Generation.
As shown in Figure 3, it is also interesting to note that the properties of materials, tool wear, band width and stroke of the FTS, and the relative vibration between the cutting tool and the rotational spindle also play important roles in material removal process.
It is found that only depth of cut contributes little effect to the surface quality, while feed rate and spindle speed play the critical roles in affecting the form accuracy of the profiles of the microstructures.
There is a need to develop deterministic models that take into account both the process and material factors in the generation of the surface.
Factors Affecting Surface Generation.
As shown in Figure 3, it is also interesting to note that the properties of materials, tool wear, band width and stroke of the FTS, and the relative vibration between the cutting tool and the rotational spindle also play important roles in material removal process.
It is found that only depth of cut contributes little effect to the surface quality, while feed rate and spindle speed play the critical roles in affecting the form accuracy of the profiles of the microstructures.
Online since: October 2017
Authors: Lubos Pazdera, Libor Topolář, Richard Dvořák
The effects of the various changes taking place in heated concrete are the alterations of its physical, thermal, and mechanical properties.
Important factors are also the rate of heating and the time of concrete exposure to high temperature.
The measured properties of thermally degraded concrete.
It can be presumed that higher value of amplitude indicates better mechanical properties of concrete thanks to better bond of the matrix.
Neville, Properties of concrete (5th edition), Prentice Hall, Edinburg Gate, 2011
Important factors are also the rate of heating and the time of concrete exposure to high temperature.
The measured properties of thermally degraded concrete.
It can be presumed that higher value of amplitude indicates better mechanical properties of concrete thanks to better bond of the matrix.
Neville, Properties of concrete (5th edition), Prentice Hall, Edinburg Gate, 2011
Online since: May 2011
Authors: Dong Wei Cao, Hai Yan Zhang
A large number of studies have shown that there are many influence factors: including the difference of molecular structure, particle size and type of crumb rubber powder, the chemical properties of asphalt, as well as modified asphalt processing technology and so on [14,15,16,17].
Measurement of Properties.
Results and Discussion Effects of ACRMA Preparation Technique on the Properties.
The shearing temperature is key factor.
Favorable properties of ACRMA can be achieved through changing the preparation technology.
Measurement of Properties.
Results and Discussion Effects of ACRMA Preparation Technique on the Properties.
The shearing temperature is key factor.
Favorable properties of ACRMA can be achieved through changing the preparation technology.
Online since: November 2019
Authors: Basil T. Wong, Jasman Y.H. Chai
In this research, we detailed how the following factors affect the scattering of light by nanofluids: (1) nanoparticle sizes, (2) volume fraction of nanoparticles, and (3) nanoparticle materials.
Ahmadi, Mirlohi, Alhuyi Nazari and Ghasempour [22] have reviewed the current efforts of researchers in determining the impact of factors including nanoparticle size on the thermal conductivity of nanofluids.
These properties will be combined with the properties of the base fluid to create the radiative properties of the nanofluids. 3.2.4 Radiative properties of base fluid.
The properties of the nanofluids may be found by using the equations in this section and properties from the previous section.
Using Eqs. (16-19), the properties of the nanofluid may be found by combining the properties of the base fluid and the nanoparticles.
Ahmadi, Mirlohi, Alhuyi Nazari and Ghasempour [22] have reviewed the current efforts of researchers in determining the impact of factors including nanoparticle size on the thermal conductivity of nanofluids.
These properties will be combined with the properties of the base fluid to create the radiative properties of the nanofluids. 3.2.4 Radiative properties of base fluid.
The properties of the nanofluids may be found by using the equations in this section and properties from the previous section.
Using Eqs. (16-19), the properties of the nanofluid may be found by combining the properties of the base fluid and the nanoparticles.
Online since: February 2013
Authors: Leszek Wojnar, Dorota Nagolska, Katarzyna Gawdzińska
Consequently, material and technological conditions affecting composite quality will be defined in this paper only for these specific features.
In Fig. 2 standardized weights of the main causes (factors) are placed in the Ishikawa diagram in the circles.
The weights of individual causative factors are determined by using the matrix of pair comparison based on the principle: if one of the comparable factors is found to be more important, it is marked as 1; the other factor gets 0.
If both factors are regarded as equally important, both are valued at 0.5.
This is noteworthy that such complex analysis of factors affecting quality of metal matrix composite castings has been done for the first time by Gawdzińska [6].
In Fig. 2 standardized weights of the main causes (factors) are placed in the Ishikawa diagram in the circles.
The weights of individual causative factors are determined by using the matrix of pair comparison based on the principle: if one of the comparable factors is found to be more important, it is marked as 1; the other factor gets 0.
If both factors are regarded as equally important, both are valued at 0.5.
This is noteworthy that such complex analysis of factors affecting quality of metal matrix composite castings has been done for the first time by Gawdzińska [6].
Online since: January 2019
Authors: BEHZAD NIROUMAND, Farshid Marani
The average diameter and shape factor of the primary particles in the semisolid cast Zamak 3 alloy was measured to be about 16 μm and 0.8, respectively.
Many parameters, including the material of the serpentine channel [17], the channel diameter and number of bends [18] and the cooling conditions [19] affect the microstructure and mechanical properties of the samples produced by this method.
Hardness of semisolid sample is affected by the hardness of both non-dendritic primary solid particles and the secondary dendritic grains.
Liu, Influence of rheo-diecasting processing parameters on microstructure and mechanical properties hypereutectic Al-30%Si alloy, Transactions of Nonferrous Metals Society of China, 27 (2017) 1264-1272
Marani, Semisolid casting of Zamak 3 alloy using modified serpentine channel and characterization of its microstructural and mechanical properties, MSc thesis, Isfahan University of Technology, 2018
Many parameters, including the material of the serpentine channel [17], the channel diameter and number of bends [18] and the cooling conditions [19] affect the microstructure and mechanical properties of the samples produced by this method.
Hardness of semisolid sample is affected by the hardness of both non-dendritic primary solid particles and the secondary dendritic grains.
Liu, Influence of rheo-diecasting processing parameters on microstructure and mechanical properties hypereutectic Al-30%Si alloy, Transactions of Nonferrous Metals Society of China, 27 (2017) 1264-1272
Marani, Semisolid casting of Zamak 3 alloy using modified serpentine channel and characterization of its microstructural and mechanical properties, MSc thesis, Isfahan University of Technology, 2018
Online since: November 2010
Authors: Ming Qiu, Jia Fei Yan, Ying Chun Li
Oxygen content in a working environment affects tribological characteristics of steels.
Furthermore, the micrographics analysis proves that the friction coefficient and the wear are strongly influenced by the surface films which depend on the tribochemistry reaction in ambient atmospheres, the adhesion between steel and brass surfaces and the mechanical properties of surface film.
Of course, the effect of atmospheres is a key factor since it controls the oxidation kinetics and oxide morphology [10].
Therefore, it is necessary to investigate the relationships between the atmospheres and the tribological properties of materials.
This may improve the mechanical properties of contact surfaces and result in a layer of surface film leading to low wear.
Furthermore, the micrographics analysis proves that the friction coefficient and the wear are strongly influenced by the surface films which depend on the tribochemistry reaction in ambient atmospheres, the adhesion between steel and brass surfaces and the mechanical properties of surface film.
Of course, the effect of atmospheres is a key factor since it controls the oxidation kinetics and oxide morphology [10].
Therefore, it is necessary to investigate the relationships between the atmospheres and the tribological properties of materials.
This may improve the mechanical properties of contact surfaces and result in a layer of surface film leading to low wear.
Online since: June 2018
Authors: Wacław Brachaczek
This is when the discord between the properties of the plaster and of the substrate appears.
This article presents the results of the research on the impact of natural and synthetic polymers with different compositions on the selected parameters affecting monolithism of mortars.
In their research the authors studied the effect of methylcellulose on the mechanical properties of hardened cement paste.
Gartner, Effect of polymer modification of the paste-aggregate interface on the mechanical properties of concretes, Cement and Concrete Research 41(5) (2011) 459-466
Chung, Effect of methylcellulose admixture on the mechanical properties of cement, Cement and Concrete Research 26(4) (1996) 535-538
This article presents the results of the research on the impact of natural and synthetic polymers with different compositions on the selected parameters affecting monolithism of mortars.
In their research the authors studied the effect of methylcellulose on the mechanical properties of hardened cement paste.
Gartner, Effect of polymer modification of the paste-aggregate interface on the mechanical properties of concretes, Cement and Concrete Research 41(5) (2011) 459-466
Chung, Effect of methylcellulose admixture on the mechanical properties of cement, Cement and Concrete Research 26(4) (1996) 535-538
Online since: February 2011
Authors: Bei Sheng Lv
Affect core?
These factors will affect the assemble cost and time in the process of assembly.
It has weighted all the factors in order to help statistics and management.
It has considered all the factors and reset the weight coding to help the management and organization.
That information includes from geometric dimensions of product, physics properties to classification code, etc.
These factors will affect the assemble cost and time in the process of assembly.
It has weighted all the factors in order to help statistics and management.
It has considered all the factors and reset the weight coding to help the management and organization.
That information includes from geometric dimensions of product, physics properties to classification code, etc.