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Online since: November 2014
Authors: Nor Azwadi Che Sidik, N.G. Yen Cheong, Alireza Fazeli
The generic list of variables affecting heat transfer from car radiator with nanofluids is illustrated in Table 1.
With refer to Table 1, few properties and parameters are fixed.
First of all, the material of nanoparticles must be selected in order to proceed to properties model selection and calculation.
Nanofluids Mechanical Properties.
Shima, Thermal properties of nanofluids, Adv.
With refer to Table 1, few properties and parameters are fixed.
First of all, the material of nanoparticles must be selected in order to proceed to properties model selection and calculation.
Nanofluids Mechanical Properties.
Shima, Thermal properties of nanofluids, Adv.
Online since: July 2016
Authors: Elena Yu. Kulikova
The main requirements for the sewage lining are waterproofing properties, mechanical strength, corrosion resistance, resistance to hydro-abrasive wear.
This leads to uncertainty when creating new means of protection of concrete lining from the effects of external factors and aggressive media flowing through the collector tunnels.
The main requirements for the lining of sewage collector tunnels can be divided into the following: • waterproofing properties [17], [19]; • mechanical resistance [10], [11, [13]; • corrosion resistance [4], [5]; • resistance to hydroabrasive wear [6], [8], [18].
Waterproof Properties of the Lining Waterproof properties of the lining of the sewage collector tunnels should provide them with sufficient resistance, including the capillary movement of moisture in the pores of the concrete.
Factors influencing the development potential of urban underground space: Structural equation model approach. – Tunneling and Underground Space Technology.
This leads to uncertainty when creating new means of protection of concrete lining from the effects of external factors and aggressive media flowing through the collector tunnels.
The main requirements for the lining of sewage collector tunnels can be divided into the following: • waterproofing properties [17], [19]; • mechanical resistance [10], [11, [13]; • corrosion resistance [4], [5]; • resistance to hydroabrasive wear [6], [8], [18].
Waterproof Properties of the Lining Waterproof properties of the lining of the sewage collector tunnels should provide them with sufficient resistance, including the capillary movement of moisture in the pores of the concrete.
Factors influencing the development potential of urban underground space: Structural equation model approach. – Tunneling and Underground Space Technology.
Online since: November 2013
Authors: Dennis V. de Pellegrin
Measuring the Mechanical Properties of Ground Ophthalmic Polymer Surfaces Using Nanoindentation
Dennis V.
An intercept factor ε=0.75 is used for Berkovich indents.
Results and Discussion Quasi-static Properties.
Creep Properties.
MHI offers good compromise of properties.
An intercept factor ε=0.75 is used for Berkovich indents.
Results and Discussion Quasi-static Properties.
Creep Properties.
MHI offers good compromise of properties.
Online since: January 2009
Authors: Albinas Kasparaitis, A. Barakauskas, R. Lazdinas, Saulius Kausinis
The scale and the comparator are affected by various ambient factors
producing a general effect on the calibration errors [1, 4, 5].
The object of this investigation is to analyze the line scale detection process and the factors affecting the detection process, and to optimize parameters of this process.
Research methods Experiments were carried out to analyze dependence of the scale line detection error on the following factors affecting it: Measuring rate Detection time/duration Detection delay Number of lines being detected A 40-lines positioning reading scatter within the 1000 mm scale length resulting from 10 samples has been accepted as a detection accuracy evaluation criterion.
Thereby an attempt is made to reduce the time, necessary for calibration of scales, and the effect produced by ambient factors on the precision.
[4] Kaušinis S., Jakštas A., Barauskas R., Kasparaitis A.: Investigation of Dynamic Properties of Line Scale Calibration Systems.
The object of this investigation is to analyze the line scale detection process and the factors affecting the detection process, and to optimize parameters of this process.
Research methods Experiments were carried out to analyze dependence of the scale line detection error on the following factors affecting it: Measuring rate Detection time/duration Detection delay Number of lines being detected A 40-lines positioning reading scatter within the 1000 mm scale length resulting from 10 samples has been accepted as a detection accuracy evaluation criterion.
Thereby an attempt is made to reduce the time, necessary for calibration of scales, and the effect produced by ambient factors on the precision.
[4] Kaušinis S., Jakštas A., Barauskas R., Kasparaitis A.: Investigation of Dynamic Properties of Line Scale Calibration Systems.
Online since: March 2017
Authors: Masoud Latifi, Aref Fakhrali, Seyed Vahid Ebadi, Abdolrasool Moghassem, Ali Akbar Gharehaghaji
Many research has been reported both in experimental and theoretical venues, concerning the interaction between various factors and proposing some models [17-19].
Pan et al. studied the mechanical properties of blended PA66/PP and CO/PET yarns [19].
That is while, the prediction of the tensile strength of the hybrid nanofiber yarn, which is affected by the properties of its components, is of critical importance.
Mechanical Properties: Strength and elongation at break of nanofiber yarns were measured and brought in Table 2.
[19] Pan, N., Chen, K. (2000), “Studying the Mechanical Properties of Blended Fibrous Structures Using a Simple Model”, Text Res J, 70, pp. 502-507
Pan et al. studied the mechanical properties of blended PA66/PP and CO/PET yarns [19].
That is while, the prediction of the tensile strength of the hybrid nanofiber yarn, which is affected by the properties of its components, is of critical importance.
Mechanical Properties: Strength and elongation at break of nanofiber yarns were measured and brought in Table 2.
[19] Pan, N., Chen, K. (2000), “Studying the Mechanical Properties of Blended Fibrous Structures Using a Simple Model”, Text Res J, 70, pp. 502-507
Online since: September 2011
Authors: Hui Ran Pi, Tian Xiao, Can Zhang Jin
Impact of Subgrade Resilience Modulus on Heavy Load Asphalt Pavement Mechanical Properties
Tian Xiao1,a, Hui ran Pi2,b and Can zhang Jin1
1 Tianjin Municipal Engineering Design & Research Institute, No. 239 Yingkou Street, Hexi District, Tianjin, 300051, China
2 School of Civil Engineering, Hebei University of Technology, No. 29 Guangrong Road, Hongqiao District, Tianjin, 300130, China
axiaotian95@126.com, bpihuiran@126.com
Keywords: Road engineering, Subgrade resilience modulus, Asphalt pavement, Heavy load, Mechanical properties
Abstract.
Subgrade is the foundation of pavement structure, and its quality will directly affect the quality of the whole highway projects.
Stronger subgrade can improve the properties of asphalt pavement.
Fig.4 Subbase Layer Bottom Tensile Stress of Different Subgrade Modulus Conclusions (1) The subgrade resilience modulus has a significant impact on asphalt pavement mechanical properties, include surface deflection, base layer tensile stress and subbase layer tensile stress
(5) The mechanical properties of heavy load asphalt pavement can be improved through increasing the subgrade resilience modulus References [1] Hong duo Zhao.
Subgrade is the foundation of pavement structure, and its quality will directly affect the quality of the whole highway projects.
Stronger subgrade can improve the properties of asphalt pavement.
Fig.4 Subbase Layer Bottom Tensile Stress of Different Subgrade Modulus Conclusions (1) The subgrade resilience modulus has a significant impact on asphalt pavement mechanical properties, include surface deflection, base layer tensile stress and subbase layer tensile stress
(5) The mechanical properties of heavy load asphalt pavement can be improved through increasing the subgrade resilience modulus References [1] Hong duo Zhao.
Online since: August 2014
Authors: Yun Qiang Liu, Yong Lv
Originally, Hopper and machine cylinder are ZG310-570, considering cost factors of selection of materials, rolling steel 16MnR is preferred to forgings 16Mn, and impact toughness is almost same at room temperature.
So, the base pressure vessel using 16mm using common 16MnR HSLA steel plate, 16MnR contains manganese relatively low, with good mechanical properties and process performance.
Mechanical properties of 16Mn and ZG310-570 are shown in Table 1.
From Table 1, the mechanical properties of ZG310-570 and 16MnR shows that the levels of 16MnR are high than steel castings on strength and toughness, the hopper and cylinder will not lower strength providing the use of composite panels 6MnR and 1Cr18Ni9.
Table1 Mechanical properties of 16Mn and ZG310-570 properties of material ZG310-570 16MnR 1Cr18Ni9 yield strength [MPa] 310 345 210 tensile strength [MPa] 570 510~655 530 elongation [%] 15 21 40 impact energy [J] 15 27 — hardness [HV] ≥900 (hard chromium plating after nitride coating) — ≤200 Because the hopper walls contacts with materials (such as rubber, fodder, etc.), feeding materials are easy to be worn, so the hopper walls should be clean and not rusty, steel castings requires hard chrome plated.
So, the base pressure vessel using 16mm using common 16MnR HSLA steel plate, 16MnR contains manganese relatively low, with good mechanical properties and process performance.
Mechanical properties of 16Mn and ZG310-570 are shown in Table 1.
From Table 1, the mechanical properties of ZG310-570 and 16MnR shows that the levels of 16MnR are high than steel castings on strength and toughness, the hopper and cylinder will not lower strength providing the use of composite panels 6MnR and 1Cr18Ni9.
Table1 Mechanical properties of 16Mn and ZG310-570 properties of material ZG310-570 16MnR 1Cr18Ni9 yield strength [MPa] 310 345 210 tensile strength [MPa] 570 510~655 530 elongation [%] 15 21 40 impact energy [J] 15 27 — hardness [HV] ≥900 (hard chromium plating after nitride coating) — ≤200 Because the hopper walls contacts with materials (such as rubber, fodder, etc.), feeding materials are easy to be worn, so the hopper walls should be clean and not rusty, steel castings requires hard chrome plated.
Online since: November 2012
Authors: Shi Yong Jiang, Qian Hua Shi, Xian Qi Hu, Bing Hong Li, Ying Tao Li
However, the experimental database is so limited that more profound understandings of the influences of the above factors are needed.
The parametric study of different factors is presented in the following section.
A group of scattered values was assigned for one of the above factors, while constant values were assigned for other factors, the shear capacity and shear failure modes were predicted for each scattered value of the specified factor using the corresponding FORTRAN code.
The variable factor was chosen in turn with the other factors remained constants, and the correlations of different factors and the shear capacity and shear failure modes are shown in Figure 2.
Mechanical Behavior and Non-linear Analysis of Short Beams Using Softened Truss and Direct Strut and Tie Models[J].
The parametric study of different factors is presented in the following section.
A group of scattered values was assigned for one of the above factors, while constant values were assigned for other factors, the shear capacity and shear failure modes were predicted for each scattered value of the specified factor using the corresponding FORTRAN code.
The variable factor was chosen in turn with the other factors remained constants, and the correlations of different factors and the shear capacity and shear failure modes are shown in Figure 2.
Mechanical Behavior and Non-linear Analysis of Short Beams Using Softened Truss and Direct Strut and Tie Models[J].
Online since: January 2012
Authors: Rosario Cantelli, Annalisa Paolone, F. Teocoli, J. Hassoun, O. Palumbo
Finally, the moisture effects on the mechanical properties of pure and doped PEO membranes are reported.
In view of the technological application we investigated, by means of anelastic spectroscopy, the mechanical properties of the composite membrane and the properties of the glass and crystal/amorphous transitions, whose occurrence affects the electrochemical performance of the polymer in the lithium battery.
In addition, the stiffness of the doped membrane in the two states is steadily higher by a factor of 2-3 with respect to pure PEO.
At the contrary, doped PEO is strongly affected by the air exposure.
Conclusions The mechanical properties of lithium battery polymer electrolyte membranes based on polyethylene oxide and on PEO doped by LiCF3SO3, Li2S and ZrO2 were measured in the temperature range 90 K - 400 K.
In view of the technological application we investigated, by means of anelastic spectroscopy, the mechanical properties of the composite membrane and the properties of the glass and crystal/amorphous transitions, whose occurrence affects the electrochemical performance of the polymer in the lithium battery.
In addition, the stiffness of the doped membrane in the two states is steadily higher by a factor of 2-3 with respect to pure PEO.
At the contrary, doped PEO is strongly affected by the air exposure.
Conclusions The mechanical properties of lithium battery polymer electrolyte membranes based on polyethylene oxide and on PEO doped by LiCF3SO3, Li2S and ZrO2 were measured in the temperature range 90 K - 400 K.
Online since: October 2014
Authors: Guo Duan Liu, Xiao Zhi Yan, Zi Li Kou, Li Lei, Duan Wei He
Cubic boron nitride (cBN) is a excellent super hard materials with superior mechanical properties that has been widely used in different industrial applications.
Conventional cBN was sintered with binder in the cBN powder, and the binder affect the mechanical properties of cBN.
Introduction Cubic boron nitride(cBN) is excellent super hard materials which possess superior properties[1-3].
Thus, these binders affect the mechanical and thermal properties of cBN samples.
The binder is one factor to affect the properties of cBN samples.
Conventional cBN was sintered with binder in the cBN powder, and the binder affect the mechanical properties of cBN.
Introduction Cubic boron nitride(cBN) is excellent super hard materials which possess superior properties[1-3].
Thus, these binders affect the mechanical and thermal properties of cBN samples.
The binder is one factor to affect the properties of cBN samples.