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Online since: June 2016
Authors: Jose Gabriel E. Mercado, Edwin N. Quiros
Its physical properties are similar to those of petroleum diesel, except that it has negligible sulfur content, which makes it a cleaner fuel alternative.
Theoretically, many factors affect torque.
Since the experiment was performed under controlled conditions, the remaining factors that will be investigated are engine speed and fuel composition.
Data Analysis and Discussions From the experimental data obtained, analysis was made using the biofuel blend and engine speed as factors against the engine torque, power and fuel consumption.
Further analysis may be needed to explore other chemical and mechanical factors.
Theoretically, many factors affect torque.
Since the experiment was performed under controlled conditions, the remaining factors that will be investigated are engine speed and fuel composition.
Data Analysis and Discussions From the experimental data obtained, analysis was made using the biofuel blend and engine speed as factors against the engine torque, power and fuel consumption.
Further analysis may be needed to explore other chemical and mechanical factors.
Online since: April 2014
Authors: Lian Xu Yu, Zhuang Qi Hu, Guo Liang Yang, Dan Jia, Wen Ru Sun, Hong Cai Yang
In fact, most specifications forbid or limit the extensive re-use of recycled materials on grounds that they were contaminated and may affect the castings made from them.
Just as Alec Mitchell mentioned, nitrogen has a significant effect on superalloy mechanical properties, almost without exception in negative sense [6].
Actually Xuebing Huang had done some related researches in1990s on DZ417G alloy, in which Zr is removed, but more attention was paid to the effect of N on the properties of directionally solidified specimens [7].
And K417G alloy contained large amount of Ti, a strong nitride-forming element, so nitrogen existed mainly in the compound state which could affect the mechanical behavior in less direct ways [12].
But the atom radius of Ti and Mo is 0.1467, 0.1386 nm respectively[14], which would show favorable size factor for the assembly of Ti(C, N) and (Ti, Mo)C.
Just as Alec Mitchell mentioned, nitrogen has a significant effect on superalloy mechanical properties, almost without exception in negative sense [6].
Actually Xuebing Huang had done some related researches in1990s on DZ417G alloy, in which Zr is removed, but more attention was paid to the effect of N on the properties of directionally solidified specimens [7].
And K417G alloy contained large amount of Ti, a strong nitride-forming element, so nitrogen existed mainly in the compound state which could affect the mechanical behavior in less direct ways [12].
But the atom radius of Ti and Mo is 0.1467, 0.1386 nm respectively[14], which would show favorable size factor for the assembly of Ti(C, N) and (Ti, Mo)C.
Online since: February 2008
Authors: Ali Shokuhfar, S. Alibeigi, Mohammad Reza Vaezi, Sayed Khatiboleslam Sadrnezhaad
In addition via the reverse co-precipitation method, the pH which is
an important factor in synthesis of magnetite was controlled at high values easily.
The experimental results reveal that addition of surfactants affected on the size and morphology of the nanoparticles based on the X-ray diffraction (XRD) and scanning electron microscope (SEM) characterizations.
Introduction In recent years, various nanomaterials have been extensively pursued for their catalytic, optical, electrical, mechanical, and magnetic properties, which are quite different from those of their bulk counterparts [1].
In spite of the method of synthesis, the preparation conditions (e.g., surfactants, concentrations, PH, reaction temperature, stirring rate, etc.) strongly influence the chemical composition, particle size, size distribution, particle morphology, crystal structure and consequently the properties and applications of the products [18,19].
In the second case, the mixed metal solution was directly dropped into an alkaline solution; consequently, the pH which is a critical factor in synthesis of magnetite could be controlled at high values easily
The experimental results reveal that addition of surfactants affected on the size and morphology of the nanoparticles based on the X-ray diffraction (XRD) and scanning electron microscope (SEM) characterizations.
Introduction In recent years, various nanomaterials have been extensively pursued for their catalytic, optical, electrical, mechanical, and magnetic properties, which are quite different from those of their bulk counterparts [1].
In spite of the method of synthesis, the preparation conditions (e.g., surfactants, concentrations, PH, reaction temperature, stirring rate, etc.) strongly influence the chemical composition, particle size, size distribution, particle morphology, crystal structure and consequently the properties and applications of the products [18,19].
In the second case, the mixed metal solution was directly dropped into an alkaline solution; consequently, the pH which is a critical factor in synthesis of magnetite could be controlled at high values easily
Online since: March 2014
Authors: Romildo Dias Toledo Filho, Paulo Roberto Lopes Lima, Otávio da Fonseca Martins Gomes
To determine the physical properties of the fine aggregates it was carried out absorption and specific weight tests.
Two shape factors were measured: Feret ratio (F-ratio) and circular shape factor (F-Circle), as defined as shown in Fig. 1.
Definitions of the shape factors quantifying the elongation and roundness of the particles.
For natural mortar (MOR) there is an increment of these properties with time.
Rheological and mechanical properties of mortars prepared with natural and manufactured sands, Cement and Concrete Research. 38 (2008) 1142-1147
Two shape factors were measured: Feret ratio (F-ratio) and circular shape factor (F-Circle), as defined as shown in Fig. 1.
Definitions of the shape factors quantifying the elongation and roundness of the particles.
For natural mortar (MOR) there is an increment of these properties with time.
Rheological and mechanical properties of mortars prepared with natural and manufactured sands, Cement and Concrete Research. 38 (2008) 1142-1147
Online since: December 2010
Authors: Yang Li, Hai Yong Qin
The effect of the sample treated with LSP is affected by many factors, such as the fluctuation of the laser power density, the condition of the overlay and the aborbent coating [8-11].For example, when the power density of a laser pulse from a Q-switched laser is insufficient or the laser misfire, the residual compressive stress caused by the laser shock wave will be deficient.
Its chemical composition and the mechanical properties are shown in Table 1.
In general, while people have the comparative sufficiently cognition among the intrinsic properties of research object and the relationship among various factors, mathematical model-y =φ( x) is build to describe by mechanism analysis method, and then parameters in model are defined using the method of curve fitting .
,Laser shock processing and its effects on microstructure and properties of metal alloys: a review, International Journal of Fatigue Vol. 24(2002) p.1021 [2] J.L.
Swain.The influence of coatings on subsurface mechanical properties of laser peened 2011-T3 aluminum.
Its chemical composition and the mechanical properties are shown in Table 1.
In general, while people have the comparative sufficiently cognition among the intrinsic properties of research object and the relationship among various factors, mathematical model-y =φ( x) is build to describe by mechanism analysis method, and then parameters in model are defined using the method of curve fitting .
,Laser shock processing and its effects on microstructure and properties of metal alloys: a review, International Journal of Fatigue Vol. 24(2002) p.1021 [2] J.L.
Swain.The influence of coatings on subsurface mechanical properties of laser peened 2011-T3 aluminum.
Online since: December 2013
Authors: C.H. Ko, M.J. Twu, P.C. Juan, H. Sekiguchi, C.H. Chou, K.C. Lin
However, Level 2 (10) -> Level 3 (15), the SNR increased thus leakage current is reduced.In other words, annealing temperature and dc power greater impact on the leakage current, these two factors are obvious impact factor (Significant Effect Factor); otherwise, argon-oxygen ratio has little effect on the leakage current non-significant factor (Insignificant Effect Factor).
Koda, “Crystal Structure and Ferroelectric Properties of Rare-earth Substituted BiFeO3 Thin Films”, Journal of Applied Physics, Vol.100, pp. 014106-014106-9, 2006
Dong, “Enhanced Multiferroic Properties of The High-valence Pr Doped BiFeO3 Thin Film”, Applied Physics Letters, Vol. 93, pp. 182909-1-3, 2008
Okamura, “Ferroelectric, Electrical and Magnetic Properties of Cr, Mn, Co, Ni, Cu Added Polycrystalline BiFeO3 Films”, Applied Physics Letters, Vol. 93, pp. 052901-1-3, 2008
Ozawa, “Improved Ferroelectric Properties in Multiferroic BiFeO3 Thin Films Through La and Nb Codoping”, Physical Review B, Vol. 77, pp. 092101-1-4, 2008
Koda, “Crystal Structure and Ferroelectric Properties of Rare-earth Substituted BiFeO3 Thin Films”, Journal of Applied Physics, Vol.100, pp. 014106-014106-9, 2006
Dong, “Enhanced Multiferroic Properties of The High-valence Pr Doped BiFeO3 Thin Film”, Applied Physics Letters, Vol. 93, pp. 182909-1-3, 2008
Okamura, “Ferroelectric, Electrical and Magnetic Properties of Cr, Mn, Co, Ni, Cu Added Polycrystalline BiFeO3 Films”, Applied Physics Letters, Vol. 93, pp. 052901-1-3, 2008
Ozawa, “Improved Ferroelectric Properties in Multiferroic BiFeO3 Thin Films Through La and Nb Codoping”, Physical Review B, Vol. 77, pp. 092101-1-4, 2008
Online since: December 2024
Authors: Oksana Berdnyk, Valeriy Makarenko, Volodymyr Gots, Natalia Amelina, Eugene Tishchenko
The problems of stress corrosion or hydrogen blistering of gas pipelines are relevant and require careful study of the causes and factors that cause this type of corrosion-mechanical destruction of pipelines.
Fragile destruction of the structure is determined not only by the properties of the metal, but also by the load conditions, operating temperature [13], as well as the constructive solution of the structure or its individual elements and the technology of their production.
Mechanical properties of steels steel brand Mechanical characteristics СЕ, [%] Granularity σВ, [МПа] σ0.2, [МПа] Ψ, [%] δ, [%] 20А 545 287 50 20 0.328 ≥11…12 08 KhMChA 560 350 48 25 0.435 ≥11…12 09 G2S 497 349 48 23 0.441 ≥7…8 17 G1S 515 362 43 24 0.430 ≥7…8 Below (Fig. 8) are the results of measurements of the hydrogen content in the metal and the value of the microhardness of the 09G2S steel from the service life.
This process is carried out under the influence of activating factors (presence of chloride ions and tension).
The problems of stress corrosion or hydrogen blistering of gas pipelines are relevant and require a careful study of the causes and factors that cause this type of corrosion-mechanical destruction of pipelines.
Fragile destruction of the structure is determined not only by the properties of the metal, but also by the load conditions, operating temperature [13], as well as the constructive solution of the structure or its individual elements and the technology of their production.
Mechanical properties of steels steel brand Mechanical characteristics СЕ, [%] Granularity σВ, [МПа] σ0.2, [МПа] Ψ, [%] δ, [%] 20А 545 287 50 20 0.328 ≥11…12 08 KhMChA 560 350 48 25 0.435 ≥11…12 09 G2S 497 349 48 23 0.441 ≥7…8 17 G1S 515 362 43 24 0.430 ≥7…8 Below (Fig. 8) are the results of measurements of the hydrogen content in the metal and the value of the microhardness of the 09G2S steel from the service life.
This process is carried out under the influence of activating factors (presence of chloride ions and tension).
The problems of stress corrosion or hydrogen blistering of gas pipelines are relevant and require a careful study of the causes and factors that cause this type of corrosion-mechanical destruction of pipelines.
Online since: August 2013
Authors: Zi Lin Li, Hong Yi Ding, Yi Du, Jiang Xue
As its good mechanical properties, steel bridge has been widely used in modern highway, railway and urban bridge construction, but its corrosion protection is also a major issue.
However, these elements also affect the strength of steel.
It will not only cause economic loss, but also affect the normal operation of traffic.
The construction technology of the steel bridge anti-corrosion is an important factor for its corrosion resistance.
To improve the corrosion resistance of steel is greatly significant for the corrosion protection of the steel bridges, some trace elements affect the corrosion resistance and strength of steel, how to change the content of the trace elements to improve the performance of the steel, which requires us to do the next experiments.
However, these elements also affect the strength of steel.
It will not only cause economic loss, but also affect the normal operation of traffic.
The construction technology of the steel bridge anti-corrosion is an important factor for its corrosion resistance.
To improve the corrosion resistance of steel is greatly significant for the corrosion protection of the steel bridges, some trace elements affect the corrosion resistance and strength of steel, how to change the content of the trace elements to improve the performance of the steel, which requires us to do the next experiments.
Online since: June 2022
Authors: Oritonda Muribwathoho, Velaphi Msomi, Sipokazi Mabuwa
Mabuwa and Msomi [25] investigated the effect of friction stir processing on the mechanical properties of friction stir welded AA1050-H14 and AA6082-T6.
Merdji, The mechanical properties of AA6082/AA1050 dissimilar joints subjected to multi-pass friction stir processing, Engineering Research Express 3, 3(2021), p.035012
Shanmughanatan, M.B Kiran, Effect of tool geometry on microstructure and mechanical Properties of friction stir processed AA2024-T351 aluminium alloy, Mater.
Aloraier, Microstructure and mechanical properties of multi-pass friction stir processed aluminium alloy 6063, Materials & Design, 53(2014), pp.550-560
Shanmughanatan, M.B, Kiran, Effect of tool geometry on microstructure and mechanical Properties of friction stir processed AA2024-T351 aluminium alloy, Mater.
Merdji, The mechanical properties of AA6082/AA1050 dissimilar joints subjected to multi-pass friction stir processing, Engineering Research Express 3, 3(2021), p.035012
Shanmughanatan, M.B Kiran, Effect of tool geometry on microstructure and mechanical Properties of friction stir processed AA2024-T351 aluminium alloy, Mater.
Aloraier, Microstructure and mechanical properties of multi-pass friction stir processed aluminium alloy 6063, Materials & Design, 53(2014), pp.550-560
Shanmughanatan, M.B, Kiran, Effect of tool geometry on microstructure and mechanical Properties of friction stir processed AA2024-T351 aluminium alloy, Mater.
Online since: March 2004
Authors: Ai Bing Yu, Xin Li Tian, L.J. Zhong, Jia Chen Liu
Machinability can be applied to provide the basis for determining the optimum machining parameters,
and to design ceramics with better machining characteristics by choosing the desired mechanical
properties.
The alternatives affecting machinability mainly include two aspects, material properties and machining parameters.
Therefore, the set of alternatives can be composed of mechanical properties of ceramics including Youngs modulus, hardness, fracture toughness, flexural strength, Weibull modulus, etc. 2.
The material properties are listed in Table 1.
Considering the relationship between mechanical properties and machining processes, the fuzzy normal distribution µ(x) is selected as the membership function
The alternatives affecting machinability mainly include two aspects, material properties and machining parameters.
Therefore, the set of alternatives can be composed of mechanical properties of ceramics including Youngs modulus, hardness, fracture toughness, flexural strength, Weibull modulus, etc. 2.
The material properties are listed in Table 1.
Considering the relationship between mechanical properties and machining processes, the fuzzy normal distribution µ(x) is selected as the membership function