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Online since: September 2014
Authors: Bin Zhi, Liang Yang, En Long Liu
In this manuscript, we studied the mechanical properties of the cement-lime-treated loess soils with different weight ratio.
The physical indices and strength properties of these samples tested are analyzed in detail and their main influence factors are also investigated.
There are many factors affecting the optimal water content of the samples, including soil properties, the value of compaction work, etc.
There are other factors, like the dry density, curing enviroment, etc., affecting the stregnth of the samples treated by lime-cement or cement,which should be investigated further.
(2) The strength of the samples are affected by many factors including treated materials, compatcion work, water content, and age.
The physical indices and strength properties of these samples tested are analyzed in detail and their main influence factors are also investigated.
There are many factors affecting the optimal water content of the samples, including soil properties, the value of compaction work, etc.
There are other factors, like the dry density, curing enviroment, etc., affecting the stregnth of the samples treated by lime-cement or cement,which should be investigated further.
(2) The strength of the samples are affected by many factors including treated materials, compatcion work, water content, and age.
Online since: August 2019
Authors: K. Tejonadha Babu, C. Sathiya Narayanan, S. Muthukumaran, C.H. Bharat Kumar
Improvement in Mechanical and Metallurgical Properties of Friction Stir Welded 6061-T6 Aluminum Alloys through Cryogenic Treatment
K.
Subsequently, mechanical properties drastically improved and the joints achieved a maximum joint efficiency of 74% of the base material.
Even though aluminum alloys have better corrosion resistance, welding atmosphere, conditions, and parameters are the factors which control the corrosion resistance.
Schaper, Characterization of microstructure, mechanical properties and corrosion behaviour of an AA2219 friction stir weldment, J.
Liu, Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy, Int.
Subsequently, mechanical properties drastically improved and the joints achieved a maximum joint efficiency of 74% of the base material.
Even though aluminum alloys have better corrosion resistance, welding atmosphere, conditions, and parameters are the factors which control the corrosion resistance.
Schaper, Characterization of microstructure, mechanical properties and corrosion behaviour of an AA2219 friction stir weldment, J.
Liu, Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy, Int.
Online since: October 2010
Authors: Zhi Li Zhong, Fei Fei Zhu, Zong Fu Guo
The tension and bending properties were investigated experimentally, and then dual variance analysis was used to show the significant difference of the mechanical property in the transverse and longitudinal orientation as well the appreciable impact of different fiber ratios to the mechanical property.
So according to the anisotropy, grasping the difference of mechanical properties in the transverse and longitudinal has the vital significance to the design of composite board.
This is because the property of the composite board is also affected by other factors such as the interfacial bond strength between CBF and PP.
This is probably due to a slight deviation, in the control of hot pressing process, which makes the adhesion property of the board in the fiber ratio of 30/70 worse and then affects its mechanical property.
The board in the fiber ratio of 30/70 is mainly scattered wire fracture, so the mechanical properties are weaker than the other two boards.
So according to the anisotropy, grasping the difference of mechanical properties in the transverse and longitudinal has the vital significance to the design of composite board.
This is because the property of the composite board is also affected by other factors such as the interfacial bond strength between CBF and PP.
This is probably due to a slight deviation, in the control of hot pressing process, which makes the adhesion property of the board in the fiber ratio of 30/70 worse and then affects its mechanical property.
The board in the fiber ratio of 30/70 is mainly scattered wire fracture, so the mechanical properties are weaker than the other two boards.
Online since: October 2024
Authors: Viorel Ungureanu, Bogdan Radu, Iosif Hulka, Nicuşor Alin Sîrbu
Therefore, the influence of the RSW process parameters established by an automatic sequence on the nugget geometry, microstructure, and mechanical properties was investigated.
Nevertheless, there were differences in terms of phase dispersion, defects and mechanical properties that have been linked to the RSW process parameters.
The influence of the welding parameters on the microstructure was evaluated by metallography and the mechanical properties were evaluated by Vickers hardness testing.
Controlling Factors.
Effect of Acicular Ferrite on Mechanical Properties of Ultra-Fine Grain Ferrite Steel.
Nevertheless, there were differences in terms of phase dispersion, defects and mechanical properties that have been linked to the RSW process parameters.
The influence of the welding parameters on the microstructure was evaluated by metallography and the mechanical properties were evaluated by Vickers hardness testing.
Controlling Factors.
Effect of Acicular Ferrite on Mechanical Properties of Ultra-Fine Grain Ferrite Steel.
Online since: June 2010
Authors: Dong Il Kwon, Seung Kyun Kang, Kug Hwan Kim, Kwang Ho Kim, Young Cheon Kim
Multiscale Mapping of Mechanical Properties
by Instrumented Indentation Test
Kug-Hwan Kim1, a
, Young-Cheon Kim1, b
, Seung-Kyun Kang1, c
Kwang-Ho Kim
2, d
, and Dongil Kwon1, e
1
Dept. of Materials Science and Engineering, Seoul National University, Seoul, Korea
2
Frontics Inc., Seoul, Korea
a
samadhi0@snu.ac.kr,
b
im01000@snu.ac.kr,
ckskg7227@snu.ac.kr
d
khkim@frontics.com, edongilk@snu.ac.kr
Keywords: Instrumented indentation test, mechanical mapping, tensile properties, residual stress
Abstract.
Thus, mechanical testing methods that can measure multiscale properties are essential for the safe and economical operation of macro/micro systems.
In addition, the tensile properties and residual stress distribution of weld joints with very rapid mechanical gradients were tested using a macroindentation system made by Frontics, Inc.
The results show that IIT is effective as an in-service inspection method in order to monitor the strength variation and mapping of mechanical properties.
This implies that IIT can be used not only for nano/microscopic mapping but also macroscopic mapping of mechanical properties.
Thus, mechanical testing methods that can measure multiscale properties are essential for the safe and economical operation of macro/micro systems.
In addition, the tensile properties and residual stress distribution of weld joints with very rapid mechanical gradients were tested using a macroindentation system made by Frontics, Inc.
The results show that IIT is effective as an in-service inspection method in order to monitor the strength variation and mapping of mechanical properties.
This implies that IIT can be used not only for nano/microscopic mapping but also macroscopic mapping of mechanical properties.
Online since: November 2012
Authors: Qing Fu Li, Hao Fu, Wei Kang Gan
Introduction
Non-quantification risk factors should be controlled at the construction site of the bridge, and the common non-quantification risk factors can be defined as the subjective controlled factors which can be influenced by human.
Therefore, it is very important to correctly understand the human error model during the bridge construction process and correctly analyze the reasons of the mistake caused by manual work, and which has great instruction to reveal the essence of the mistake caused by manual work and control the risk caused by manual work Factors Affecting Reliability of Manual Work.
In the cooperation work of the group, the individual will always show several properties including relative property, imitativeness, competitiveness and being complementary to each other.
The properties can improve the reliability of the personal and the work efficiency when managers are good at management, but if not, it may cause serious negative effect and reduce the reliability [6].
There are three main factors affecting risk of construction machine, which in includes human, state of machine and economical efficiency use of machine.
Therefore, it is very important to correctly understand the human error model during the bridge construction process and correctly analyze the reasons of the mistake caused by manual work, and which has great instruction to reveal the essence of the mistake caused by manual work and control the risk caused by manual work Factors Affecting Reliability of Manual Work.
In the cooperation work of the group, the individual will always show several properties including relative property, imitativeness, competitiveness and being complementary to each other.
The properties can improve the reliability of the personal and the work efficiency when managers are good at management, but if not, it may cause serious negative effect and reduce the reliability [6].
There are three main factors affecting risk of construction machine, which in includes human, state of machine and economical efficiency use of machine.
Online since: August 2009
Authors: Bin Bin Jia, Jing Bo Yu, Wei Wei Wang
Microstructure characteristics and mechanical
properties of the rapid solidified ribbon of 7A09 aluminum alloys are studied by means of X-ray
diffraction (XRD), scan electron microscopy (SEM) and hardness measurement.
The results show that the rotate speed of the roller is the key factor affecting the ability of the forming ribbon.
All above are beneficial to increase the mechanical properties, to improve machining performances and to enhance corrosion resistance of the alloys [1~4].
Microstructural features and mechanical properties of the rapid solidification ribbon of 7A09 aluminum alloys are studied.
Conclusions (1) The most important factor affecting the forming ability of ribbon is the rotating speed of the cooling rotor.
The results show that the rotate speed of the roller is the key factor affecting the ability of the forming ribbon.
All above are beneficial to increase the mechanical properties, to improve machining performances and to enhance corrosion resistance of the alloys [1~4].
Microstructural features and mechanical properties of the rapid solidification ribbon of 7A09 aluminum alloys are studied.
Conclusions (1) The most important factor affecting the forming ability of ribbon is the rotating speed of the cooling rotor.
Online since: July 2016
Authors: Alexey A. Skvortsov, Elena B. Cherepetskaya
Assessment of Factors Affecting the Final Value of «volume loss» by TBM tunneling
{0><}0{>Alexey A.
affecting the increase of this parameter, and their quantitative assessment is given in this paper.<0} {0>Применение предложенной в статье методики позволяет оперативно оценить влияние проходческих работ на существующие подрабатываемые объекты с учетом основных влияющих факторов.<}0{>The method proposed in this paper makes it possible to promptly assess the impact of tunneling operations on the existing underworked structures with account of basic influencing factors.<0}{0>Ключевые слова:<}94{> Introduction At present, the development of large cities and megapolises is impossible without developing their underground space.
The paper provides the analysis of the basic factors affecting the “construction clearance” value, their quantitative analysis and the simple expressions constructed in order to determine the design value of the “construction clearance”: , (1) where u0 is the value of double construction clearance due to the difference between TBM rotor diameter and tunnel lining outside diameter, taking into account that the “construction clearance” is filled with grout; u1 is the displacement caused by the subsidence of the TBM head by gravity; u2 is the displacement due to soil deformations at the face; u3 is the displacement due to lining deformations underground pressure.
In order to determine the compressed strata depth, a design model was developed to take into account the basic physical and mechanical properties of soil mass, its stratification and basic characteristics of shield-type tunnel-boring machines.
(6) where k1=18÷20 – factor that depends on soil properties; Нс – compressed strata depth, m; η – shield subsidence, mm; D – outside diameter of the TBM head, m; G – weight of the TBM head, kN; G1 – weight per linear meter of the TBM head, kN/m; L – length of the TBM head, m; γi and hi – bulk density of the i-th soil layer and layer thickness, respectively; γsoil – thickness-averaged soil bulk density, kN/m3.
affecting the increase of this parameter, and their quantitative assessment is given in this paper.<0} {0>Применение предложенной в статье методики позволяет оперативно оценить влияние проходческих работ на существующие подрабатываемые объекты с учетом основных влияющих факторов.<}0{>The method proposed in this paper makes it possible to promptly assess the impact of tunneling operations on the existing underworked structures with account of basic influencing factors.<0}{0>Ключевые слова:<}94{> Introduction At present, the development of large cities and megapolises is impossible without developing their underground space.
The paper provides the analysis of the basic factors affecting the “construction clearance” value, their quantitative analysis and the simple expressions constructed in order to determine the design value of the “construction clearance”: , (1) where u0 is the value of double construction clearance due to the difference between TBM rotor diameter and tunnel lining outside diameter, taking into account that the “construction clearance” is filled with grout; u1 is the displacement caused by the subsidence of the TBM head by gravity; u2 is the displacement due to soil deformations at the face; u3 is the displacement due to lining deformations underground pressure.
In order to determine the compressed strata depth, a design model was developed to take into account the basic physical and mechanical properties of soil mass, its stratification and basic characteristics of shield-type tunnel-boring machines.
(6) where k1=18÷20 – factor that depends on soil properties; Нс – compressed strata depth, m; η – shield subsidence, mm; D – outside diameter of the TBM head, m; G – weight of the TBM head, kN; G1 – weight per linear meter of the TBM head, kN/m; L – length of the TBM head, m; γi and hi – bulk density of the i-th soil layer and layer thickness, respectively; γsoil – thickness-averaged soil bulk density, kN/m3.
Online since: September 2016
Authors: Jorge Fernandez Dos Santos, Luciano Bergmann, Eduardo E. Feistauer
a*eduardo.feistauer@hzg.de, bluciano.bergmann@hzg.de, cjorge.dos.santos@hzg.de
Keywords: Tailor welded blanks, Friction stir welding, Local and global mechanical properties
Abstract.
Moreover, the rotational speed directly affected the ROL distribution and consequently the mechanical properties of the welds.
Figure 5: Tensile stress-strain curve for the TWB joints (a), mechanical properties of the joints (B) and strain maps obtained by DIC.
Pieters, Mechanical properties and microstructure of friction stir welded tailor-made blanks, Mater.
Benedictus, Global and Local Mechanical Properties and Microstructure of Friction Stir Welds with Dissimilar Materials and/or Thicknesses, Metall.
Moreover, the rotational speed directly affected the ROL distribution and consequently the mechanical properties of the welds.
Figure 5: Tensile stress-strain curve for the TWB joints (a), mechanical properties of the joints (B) and strain maps obtained by DIC.
Pieters, Mechanical properties and microstructure of friction stir welded tailor-made blanks, Mater.
Benedictus, Global and Local Mechanical Properties and Microstructure of Friction Stir Welds with Dissimilar Materials and/or Thicknesses, Metall.
Online since: January 2017
Authors: Teeradej Wuttipornpun, Kusol Pimapunsri, Darawan Veeranant
The separation force is one of the most important properties of artificial leather industry.
The result of cause and effect analysis shows that there are three laminating factors directly affect the separation force.
Table 1 Levels of laminating factors.
Based on the analysis of variance (ANOVA), all main factors are significantly affected to MD and TD, whereas there is no interaction effect from all combinations of the main factors.
Hajjaji, Quantification of the effects of manufacturing factors on ceramic properties using full factorial design, J.
The result of cause and effect analysis shows that there are three laminating factors directly affect the separation force.
Table 1 Levels of laminating factors.
Based on the analysis of variance (ANOVA), all main factors are significantly affected to MD and TD, whereas there is no interaction effect from all combinations of the main factors.
Hajjaji, Quantification of the effects of manufacturing factors on ceramic properties using full factorial design, J.