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Online since: January 2016
Authors: Michael Zinigrad, Maya Radune, Nachum Frage
It was established that SPS-processed specimens display significantly improved mechanical properties compared with those of pure TiN.
The HEBM is a complex process that involves many variables, such as ball to powder ratio, milling speed, ball size, milling time, starting powder size, mechanical properties of the initial powders, milling atmosphere, etc.
It was established that all factors, except the ball to powder weight ratio, are significant.
ANOVA table Factor DOF (f) Sum of Squares (S) Variance (V) F-Ratio (F) Pure Sum (S) Contribution, P(%) Milling speed 2 2.39 1.19 144.89 2.37 72.82 Milling time 2 0.04 0.02 2.50 0.02 0.76 BPWR 2 0.66 0.33 40.21 0.65 19.84 Other error 20 0.16 0.01 6.58 Total 26 3.26 100% It was established that pooling of insignificant factors (time of milling) from the consideration (28) does not change the ANOVA results.
Leyendecker, On structure and properties of sputtered Ti and Al based hard compound films, J.
The HEBM is a complex process that involves many variables, such as ball to powder ratio, milling speed, ball size, milling time, starting powder size, mechanical properties of the initial powders, milling atmosphere, etc.
It was established that all factors, except the ball to powder weight ratio, are significant.
ANOVA table Factor DOF (f) Sum of Squares (S) Variance (V) F-Ratio (F) Pure Sum (S) Contribution, P(%) Milling speed 2 2.39 1.19 144.89 2.37 72.82 Milling time 2 0.04 0.02 2.50 0.02 0.76 BPWR 2 0.66 0.33 40.21 0.65 19.84 Other error 20 0.16 0.01 6.58 Total 26 3.26 100% It was established that pooling of insignificant factors (time of milling) from the consideration (28) does not change the ANOVA results.
Leyendecker, On structure and properties of sputtered Ti and Al based hard compound films, J.
Online since: January 2013
Authors: Wan Li Du, Wei Xing Zhu, Jian Hua He, Xin Cheng Li
The weld width of laser welding not only affects the tailor welded blank forming properties, but also leads to fracture failure to a great extent during the stamping process.
In order to optimize the weld process and ensure laser welded tailored blanks (LWTBs) forming properties, the weld width should be predicted and controlled.
Ever since a long time ago, the optimization of metal laser welding process and controlling of weld width of various sheet are mainly determined by physical tests, which will cost a lot of manpower, material and time, in addition, the human factors in various control processes will more or less affect the accuracy of the optimization of laser welding process and control of weld width.
For choosing a specific width value ,the user may obtain the corresponding optimal model group of technological factors through reversing the optimal PLS prediction model group, which means that technology program of the minimum weld width of the tailor welded blank will appear.
First of all, the database module imports the T0, AC1 of B340/590DP steel, and other three relevant factors, the build-flow chart and steps of weld width prediction module are as the same as steps in the Third part.
In order to optimize the weld process and ensure laser welded tailored blanks (LWTBs) forming properties, the weld width should be predicted and controlled.
Ever since a long time ago, the optimization of metal laser welding process and controlling of weld width of various sheet are mainly determined by physical tests, which will cost a lot of manpower, material and time, in addition, the human factors in various control processes will more or less affect the accuracy of the optimization of laser welding process and control of weld width.
For choosing a specific width value ,the user may obtain the corresponding optimal model group of technological factors through reversing the optimal PLS prediction model group, which means that technology program of the minimum weld width of the tailor welded blank will appear.
First of all, the database module imports the T0, AC1 of B340/590DP steel, and other three relevant factors, the build-flow chart and steps of weld width prediction module are as the same as steps in the Third part.
Online since: July 2020
Authors: Suprapedi Suprapedi, Muljadi Muljadi, Ramlan Ramlan, Priyo Sardjono
Some parameters that can affect the magnetic properties in bonding magnets are particle size, processing temperature, loading factor, the compaction pressure and degree of orientation [8].
Chmiel, Magnetic and Mechanical Properties of Strontium Ferrite and Nd–Fe–B Rubber Bonded Permanent Magnets, Acta Physica Polonica A Vol. 136 (2019) 685-688 [5] Balakrishnan Nagarajan, Milad Kamkar, Martin A.W.
Shih, Bao-Min Ma, Edgar Lara-Curzio, Ronald O.Scattergood, 2003 Mechanical properties of Nylon bonded Nd–Fe–B permanent magnets, Journal of Magnetism and Magnetic Materials 257 (2008) 32–43
Morii, Magnetic and dynamic mechanical properties of barium ferrite–natural rubber composites, Journal of Materials Processing Technology 160 (2005) 229–233 [16] E.Urogiova, I.
Bellusova,Bratislava, Magnetic and Mechanical Properties of Strontium Ferrite– Rubber Composites, KGK _ Mai (2006 ) 224 - 228
Chmiel, Magnetic and Mechanical Properties of Strontium Ferrite and Nd–Fe–B Rubber Bonded Permanent Magnets, Acta Physica Polonica A Vol. 136 (2019) 685-688 [5] Balakrishnan Nagarajan, Milad Kamkar, Martin A.W.
Shih, Bao-Min Ma, Edgar Lara-Curzio, Ronald O.Scattergood, 2003 Mechanical properties of Nylon bonded Nd–Fe–B permanent magnets, Journal of Magnetism and Magnetic Materials 257 (2008) 32–43
Morii, Magnetic and dynamic mechanical properties of barium ferrite–natural rubber composites, Journal of Materials Processing Technology 160 (2005) 229–233 [16] E.Urogiova, I.
Bellusova,Bratislava, Magnetic and Mechanical Properties of Strontium Ferrite– Rubber Composites, KGK _ Mai (2006 ) 224 - 228
Online since: August 2011
Authors: Fadela Haddad, Meriem Amoura
Introduction
Lubricants, like all mechanical parts of equipment we use, undergo a process of degradation of their characteristics both physical and chemical properties under the influence of external constraints.
Lubricating oil is one of the most important factors affecting the life of the engine.
Any change in its composition or physicochemical properties during the service life can be classified as an aging process.
The latter includes the evolution of the physicochemical properties of oil in service with the characteristics of the new oil in the same category.
Indeed, our analysis we have found that several factors contributed to the degradation of the initial characteristics of the oil studied.
Lubricating oil is one of the most important factors affecting the life of the engine.
Any change in its composition or physicochemical properties during the service life can be classified as an aging process.
The latter includes the evolution of the physicochemical properties of oil in service with the characteristics of the new oil in the same category.
Indeed, our analysis we have found that several factors contributed to the degradation of the initial characteristics of the oil studied.
Online since: April 2021
Authors: Jun Bo Liu, Li Mei Wang, Jun Hai Liu
Factors affecting toughness of Fe-Cr-C coating include grain size, inclusions and morphology of carbides.
Investigation of Formation Mechanism and Mechanical Properties of the Tungsten Carbide Cemented Layer Produced by A Diffusion-controlled Reaction.
Surface Friction and Wear Properties and Lubrication Mechanism of Textured HA/ZrO2 Coatings.
Some Factors Affecting Spheroidizing of Carbides in Low-Chromium White Cast Iron.
Microstructure and Tensile Properties of TiC/Ti-5Mo-5V-2Cr-3AI Composites Prepared by Melt In-situ Reaction Spray Forming.
Investigation of Formation Mechanism and Mechanical Properties of the Tungsten Carbide Cemented Layer Produced by A Diffusion-controlled Reaction.
Surface Friction and Wear Properties and Lubrication Mechanism of Textured HA/ZrO2 Coatings.
Some Factors Affecting Spheroidizing of Carbides in Low-Chromium White Cast Iron.
Microstructure and Tensile Properties of TiC/Ti-5Mo-5V-2Cr-3AI Composites Prepared by Melt In-situ Reaction Spray Forming.
Online since: July 2011
Authors: Xiao Juan Wu, Zheng Jun Liu, Guo De Li
Furthermore, the mechanical properties of coating were studied by micro-hardness tester and universal friction-wear testing machine.
By orthogonal test, the technology parameters affecting electroless plating were optimized.
Therefore, these two are not chosen as the reference factors in this orthogonal test.
Analysis based on orthogonal test is as follows: for hardness, P percentage content, and wear loss of the coating, the sequence of all factors is: E→A→C→B→D.
Table 1 Factors and levels of orthogonal test levels C6H5O7Na3•2H2O (g•L-1) H2N-CH2-COOH (g•L-1) CH3COONa (g•L-1) C4H6O4 (g•L-1) PH Value A B C D E 1 9 8 10 1 4.2 2 12 10 12 3 4.4 3 15 12 15 5 4.6 4 18 14 18 7 4.8 Table 2 Results of orthogonal test L16 (45) No.
By orthogonal test, the technology parameters affecting electroless plating were optimized.
Therefore, these two are not chosen as the reference factors in this orthogonal test.
Analysis based on orthogonal test is as follows: for hardness, P percentage content, and wear loss of the coating, the sequence of all factors is: E→A→C→B→D.
Table 1 Factors and levels of orthogonal test levels C6H5O7Na3•2H2O (g•L-1) H2N-CH2-COOH (g•L-1) CH3COONa (g•L-1) C4H6O4 (g•L-1) PH Value A B C D E 1 9 8 10 1 4.2 2 12 10 12 3 4.4 3 15 12 15 5 4.6 4 18 14 18 7 4.8 Table 2 Results of orthogonal test L16 (45) No.
Online since: April 2022
Authors: Pierluigi Colombi, Angelo Savio Calabrese, Tommaso D'Antino, Carlo Poggi
Mechanical properties of GFRP and masonry constituents.
The result variability can be attributed to several factors, such as the specimen preparation, randomly distributed interface properties, alignment of glass fibers in the anchor, and alignment between the anchor axis and the load direction [9].
Indeed, the inhomogeneity of masonry substrates determines different interface properties that in turn affect the bond behavior [17].
Conclusions In this paper, the mechanical and bond properties of GFRP anchors designed for FRCM applications were investigated.
The results obtained provide important information on the mechanical properties and maximum load that can be borne by the anchors.
The result variability can be attributed to several factors, such as the specimen preparation, randomly distributed interface properties, alignment of glass fibers in the anchor, and alignment between the anchor axis and the load direction [9].
Indeed, the inhomogeneity of masonry substrates determines different interface properties that in turn affect the bond behavior [17].
Conclusions In this paper, the mechanical and bond properties of GFRP anchors designed for FRCM applications were investigated.
The results obtained provide important information on the mechanical properties and maximum load that can be borne by the anchors.
Online since: January 2013
Authors: Jian Wei Yue, Xiu Ying Meng
And further, independent sealing pores, high mechanical strength of pore wall, pore structure approximate to sphere and pore diameter with similar and small size were all favorable factors for higher strength of foam concrete.
Because chemical foaming has huge advantage in strength , water absorption properties and low density, the method of chemical foaming is selected in test andf foaming agent is hydrogen peroxide.
Experimental study on the effect of foaming agent on the mechanical and thermal properties of chemical foaming foam concrete.
Various factors affect the composition of the cell wall and cell type affect the foam concrete strength
Approximates the spherical cell structure and uniform size and smaller pore size are favorable factors of foam concrete strength.
Because chemical foaming has huge advantage in strength , water absorption properties and low density, the method of chemical foaming is selected in test andf foaming agent is hydrogen peroxide.
Experimental study on the effect of foaming agent on the mechanical and thermal properties of chemical foaming foam concrete.
Various factors affect the composition of the cell wall and cell type affect the foam concrete strength
Approximates the spherical cell structure and uniform size and smaller pore size are favorable factors of foam concrete strength.
Online since: August 2020
Authors: Abdul Muttalib I. Said, Abbas O. Dawood, Mosa J. Al-Mosawe
Table 1 summarizes the properties of the tested pipes.
Table 3 summarized the bedding and backfill soil properties.
Figure 6 Description of tests variables Table 3 Bedding and backfill soil properties Test No.
The results of bedding factors are shown in Table 6.
Figure 10 Bedding effect on pipes deflections Figure 11 Vertical stress caused by strip load Table 6 Results of bedding factors Test No.
Table 3 summarized the bedding and backfill soil properties.
Figure 6 Description of tests variables Table 3 Bedding and backfill soil properties Test No.
The results of bedding factors are shown in Table 6.
Figure 10 Bedding effect on pipes deflections Figure 11 Vertical stress caused by strip load Table 6 Results of bedding factors Test No.
Online since: March 2012
Authors: Ming Yin, Li Zhong Wang
Table1 The Chamical Composition Content(%)
Element
C
Si
Mn
P
S
Cr
Ni
Cu
sample
0.43
0.25
0.64
0.008
0.010
0.04
<0.02
0.08
Standard value
0.42~0.50
0.17~0.37
0.50~0.80
<0.04
<0.040
<0.25
<0.25
<0.30
Material defects.Selecting the part of the off-axis conducts materials analysis and experiment about mechanical properties, Materials analysis results show that if the elected materials are made of high-quality carbon structural steel and alloy steel and not through the effective heat treatment, the material performance will be poor, not strong enough.
According to Mechanical Engineering Materials Handbook, when the survival rate is 95%, the fatigue limit of the 45 carbon steel in the development lifespan of : is 334Mpa,is 1.76,is 0.62,β is 0.89,==71.3Mpa,so the fatigue strength of the roller shaft is checked to : ===1.4.
n is allowed safety factors are generally defined as:Uniform material,high calculation accuracy when n 1.3 ~1.5;Uneven material, low calculation accuracy when n = 1.5 -1.8;Poor material, low calculation accuracy when n=1.8~2.5.
By reducing the effective stress concentration factor kτ of components shear stress, improving components surface quality factor β, we can make the origin time of the fatigue crack source become longer, thereby increasing its fatigue lifespan.
The materials must meet the mechanical properties and microstructure, inclusion level standards of the design requirements.
According to Mechanical Engineering Materials Handbook, when the survival rate is 95%, the fatigue limit of the 45 carbon steel in the development lifespan of : is 334Mpa,is 1.76,is 0.62,β is 0.89,==71.3Mpa,so the fatigue strength of the roller shaft is checked to : ===1.4.
n is allowed safety factors are generally defined as:Uniform material,high calculation accuracy when n 1.3 ~1.5;Uneven material, low calculation accuracy when n = 1.5 -1.8;Poor material, low calculation accuracy when n=1.8~2.5.
By reducing the effective stress concentration factor kτ of components shear stress, improving components surface quality factor β, we can make the origin time of the fatigue crack source become longer, thereby increasing its fatigue lifespan.
The materials must meet the mechanical properties and microstructure, inclusion level standards of the design requirements.