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Online since: February 2013
Authors: Yong Hui Xie, Mohammad Moshfeghi, Kun Lu
Furthermore, the average radial distributions of axial and tangential induction factors are calculated based on the velocity values at the planes.
After extracting the velocity values, the axial induction factors are calculated based on the BEM.
While a fully circular plane, which is used in the BEM theory, is an appropriate choice for averaged properties at a specific axial location, accurate local data cannot be extracted form them in the neighborhood of the blade.
Despite the irregularities in axial induction factors, the tangential induction factor decreases constantly along the blade.
Carcangiu: PhD Thesis, University of Cagliari, Department of Mechanical Engineering, 2008.
After extracting the velocity values, the axial induction factors are calculated based on the BEM.
While a fully circular plane, which is used in the BEM theory, is an appropriate choice for averaged properties at a specific axial location, accurate local data cannot be extracted form them in the neighborhood of the blade.
Despite the irregularities in axial induction factors, the tangential induction factor decreases constantly along the blade.
Carcangiu: PhD Thesis, University of Cagliari, Department of Mechanical Engineering, 2008.
Online since: September 2017
Authors: S.V. Davydov, O.A. Gorlenko
Thermokinetic factors affect the critical size and the speed of nuclei formation, their number and form.
Foundry iron "heredity" is determined by the following factors: 1.
Additional studies [15] showed that the level of mechanical and operational properties is at the optimum level.
It was found out that zinc contributes to ferritizing matrix, increases the content of graphite and coarsens it, which reduces mechanical properties to some extent.
[16] The influence of zinc additives on microstructure and mechanical properties of iron castings, Foundry. 5 (2004) 33-34.
Foundry iron "heredity" is determined by the following factors: 1.
Additional studies [15] showed that the level of mechanical and operational properties is at the optimum level.
It was found out that zinc contributes to ferritizing matrix, increases the content of graphite and coarsens it, which reduces mechanical properties to some extent.
[16] The influence of zinc additives on microstructure and mechanical properties of iron castings, Foundry. 5 (2004) 33-34.
Online since: August 2021
Authors: Alexander V. Shaparev
In addition to layers high adhesion strength, a number of requirements are imposed on bimetallic brass-steel-brass strips in terms of dimensional accuracy, mechanical properties and microstructure [6].
Relative reduction during cladding affects bimetal layers adhesion strength, character of microstructure, the size of recrystallized grains, strip mechanical properties, and dimensional accuracy [7].
To achieve required stretching properties of bimetallic strips, optimum deformation degree must be in the range 0.45...0.60.
Large values of joint deformation degree lead to excessive grain refinement after recrystallization process and increase material mechanical properties anisotropy, while lower values contribute to excessive growth of ferrite grains during annealing and surface deterioration after stamping [8].
The factors were varied in the ranges: T0 = 550...900°C; HpH=2,0…4,0.
Relative reduction during cladding affects bimetal layers adhesion strength, character of microstructure, the size of recrystallized grains, strip mechanical properties, and dimensional accuracy [7].
To achieve required stretching properties of bimetallic strips, optimum deformation degree must be in the range 0.45...0.60.
Large values of joint deformation degree lead to excessive grain refinement after recrystallization process and increase material mechanical properties anisotropy, while lower values contribute to excessive growth of ferrite grains during annealing and surface deterioration after stamping [8].
The factors were varied in the ranges: T0 = 550...900°C; HpH=2,0…4,0.
Online since: January 2022
Authors: Mhd. Ramle Sitti Fatimah, Abdul Hamid Zubaidah Aimi, Noor Fazliani Shoparwe, Aminuddin Adila
Analysis the properties of biofilm.
According to the result, the higher content of glycerol used in production of biofilm affecting the water absorption on the bioplastic due to the polar properties of glycerol which was soluble in water and natural hygroscopic.
The use of different glycerol ratios in biofilm affected the mechanical, physical, hydrophobicity and biodegradability properties of starch-based plastic.
[6] Basiak, E., Lenart, A., & Debeaufort, F, How glycerol and water contents affect the structural and functional properties of starch-based edible films.
E, Barrier, mechanical and optical properties of plasticized yam starch films.
According to the result, the higher content of glycerol used in production of biofilm affecting the water absorption on the bioplastic due to the polar properties of glycerol which was soluble in water and natural hygroscopic.
The use of different glycerol ratios in biofilm affected the mechanical, physical, hydrophobicity and biodegradability properties of starch-based plastic.
[6] Basiak, E., Lenart, A., & Debeaufort, F, How glycerol and water contents affect the structural and functional properties of starch-based edible films.
E, Barrier, mechanical and optical properties of plasticized yam starch films.
Online since: June 2008
Authors: Zhong Han, Yi Nong Shi
Surface modification of engineering materials is one of the routes to get to the objective by optimizing
the properties of material surface.
As more and more evidences of appealing properties of NC materials have been found, it is reasonable to expect that a NC layer on a bulk material may have enhanced properties compared with the bulk matrix.
Surface nanocrystallization [4] aims at the generation of nanostructured surface layer to improve the overall properties and behaviors of the materials without changing bulk properties.
Recent investigations also indicated that other factors, such as melting point [13], phase transformation [10], second phase particles [20] will also affect the grain refinement process.
The hardness of a material is one of the most important mechanical properties in wear and has been widely employed as a criterion to determine the abrasive wear resistance [25].
As more and more evidences of appealing properties of NC materials have been found, it is reasonable to expect that a NC layer on a bulk material may have enhanced properties compared with the bulk matrix.
Surface nanocrystallization [4] aims at the generation of nanostructured surface layer to improve the overall properties and behaviors of the materials without changing bulk properties.
Recent investigations also indicated that other factors, such as melting point [13], phase transformation [10], second phase particles [20] will also affect the grain refinement process.
The hardness of a material is one of the most important mechanical properties in wear and has been widely employed as a criterion to determine the abrasive wear resistance [25].
Online since: December 2014
Authors: Julia Zimmermann de Assunção, Cristiano Binder, Aloisio Nelmo Klein, Kaline Pagnan Furlan, Gustavo Paz
The MoS2 influence during processing and in the parts properties is also covered.
Table 1: Technological properties of mixtures containing 0 to 9% of MoS2. * Samples compacted at 500MPa.
Microstructural and Properties Evolution The microstructural and properties evolution results are in accordance with the sintering studies performed by dilatometry technique (fig. 7 and table 3).
Table 3: Properties of samples containing 0 to 9% vol. of MoS2 sintered at 1150 °C.
The initial content also has no influence on the reaction temperature but the phase morphology (shape factor, elongation, diameter and so on) is directly dependent on the MoS2 initial content and the mechanical properties depend upon these different morphologies.
Table 1: Technological properties of mixtures containing 0 to 9% of MoS2. * Samples compacted at 500MPa.
Microstructural and Properties Evolution The microstructural and properties evolution results are in accordance with the sintering studies performed by dilatometry technique (fig. 7 and table 3).
Table 3: Properties of samples containing 0 to 9% vol. of MoS2 sintered at 1150 °C.
The initial content also has no influence on the reaction temperature but the phase morphology (shape factor, elongation, diameter and so on) is directly dependent on the MoS2 initial content and the mechanical properties depend upon these different morphologies.
Online since: January 2021
Authors: Xu Dong Yang, Fan Gu, Xin Chen
The research results show that the performance of sports equipment based on carbon fiber reinforced epoxy composite materials has been greatly improved, with outstanding effects in terms of thermal properties, interface properties, mechanical properties, and fatigue resistance.
Interfacial modification can make composite materials have better mechanical properties, interface properties, and fatigue resistance than matrix modification.
Due to the limitation of the actual situation and objective factors, relevant data cannot be obtained.
Thus, there will be many interference factors.
This paper ignores many external factors, and the results obtained are slightly less convincing.
Interfacial modification can make composite materials have better mechanical properties, interface properties, and fatigue resistance than matrix modification.
Due to the limitation of the actual situation and objective factors, relevant data cannot be obtained.
Thus, there will be many interference factors.
This paper ignores many external factors, and the results obtained are slightly less convincing.
Online since: December 2006
Authors: Jian Feng Li, Dong Lu, Jie Sun, Bo Xin
Uneven distribution of the residual stress is the main factor causing the distortion of a
workpiece.
Clamping stress coupling with the residual stress inside the part induces different stress distribution, which affects components' machining distortion and service life.
Uneven distribution of the residual stress is the main factor causing components' machining distortion.
Clamping scheme is one of the factors that effect the redistribution of the residual stress.
A constant static coefficient of friction 0.3 was used to establish contact properties at the interfaces.
Clamping stress coupling with the residual stress inside the part induces different stress distribution, which affects components' machining distortion and service life.
Uneven distribution of the residual stress is the main factor causing components' machining distortion.
Clamping scheme is one of the factors that effect the redistribution of the residual stress.
A constant static coefficient of friction 0.3 was used to establish contact properties at the interfaces.
Online since: May 2022
Authors: Alin Constantin Murariu
Recently, graphene (the two-dimensional version of graphite), a material with special properties, is becoming increasingly used in various practical applications.
Due to the resistance to chemical factors and mechanical actions, as well as due to the finishing qualities, polyurethane paints are successfully used for: metal structures, exterior surfaces of tanks, bridges, transport equipment, wagons, tanks, agricultural and construction machinery and equipment.
Due to its high corrosion resistance properties, the material is used in welded structures for the nuclear field, boiler production, in applications in the marine environment (boat production), road signs, etc.
The preparation can be done by different mechanical or chemical processes (cleaning of oxides, greases or other impurities that can affect the quality of the surface after painting).
H.: Covalently-grafted graphene oxide nanosheets to improve barrier and corrosion protection properties of polyurethane coatings, Carbon 93 (2015) 555–573 [5] Trupti N.
Due to the resistance to chemical factors and mechanical actions, as well as due to the finishing qualities, polyurethane paints are successfully used for: metal structures, exterior surfaces of tanks, bridges, transport equipment, wagons, tanks, agricultural and construction machinery and equipment.
Due to its high corrosion resistance properties, the material is used in welded structures for the nuclear field, boiler production, in applications in the marine environment (boat production), road signs, etc.
The preparation can be done by different mechanical or chemical processes (cleaning of oxides, greases or other impurities that can affect the quality of the surface after painting).
H.: Covalently-grafted graphene oxide nanosheets to improve barrier and corrosion protection properties of polyurethane coatings, Carbon 93 (2015) 555–573 [5] Trupti N.
Online since: June 2011
Authors: Xiao Fei Wang, Yu Fei Zhang, Kan Yu, Xiao Mei Yu
The factors affecting the ratio of vertical and lateral oxidation, for example, the gentle slope caused by isotropic oxidation and the inhomogeneity of the sidewall of silicon nano-wire, are discussed at last.
The process errors during the ASE and lithography lead to the trapezoid cross-section of the structure, which possibly affects the measurement of the width of micro-wire in SEM photos.
Besides, the gentle slope caused by thermal oxidation will affect the measurement of structure.
Kanayama: Si Pillar Photonic Crystal Slab with Linear Defects, Transmittance and Waveguide Properties.
[7] Zhenting Dai, Keunhan Park, William P.King:100 Nanometer Scale Resistive Heater-Thermometer on a Silicon Cantilever, Micro Electro Mechanical Systems(2009),p.543-546
The process errors during the ASE and lithography lead to the trapezoid cross-section of the structure, which possibly affects the measurement of the width of micro-wire in SEM photos.
Besides, the gentle slope caused by thermal oxidation will affect the measurement of structure.
Kanayama: Si Pillar Photonic Crystal Slab with Linear Defects, Transmittance and Waveguide Properties.
[7] Zhenting Dai, Keunhan Park, William P.King:100 Nanometer Scale Resistive Heater-Thermometer on a Silicon Cantilever, Micro Electro Mechanical Systems(2009),p.543-546