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Online since: September 2011
Authors: Rui Zhang, Guang Ming Chen, Jian Qiao Li, Gui Fen Zhou, Shu Cai Xu
In order to study the pressure-sinkage characteristics, several experimental studies of the effect of the low gravity environment on soil properties have been performed.
The mechanical properties are list in Table 1.
Table 1 The mechanical properties of the sample soil (lunar soil simulant-1) Parameter Median diameter μm Bulk density g/cm3 d10 μm d30 μm d60 μm Cu Cc value 50 1.10~1.39 4.5 22 75 16.7 1.43 Two plates (45mm and 50mm in diameter) were used in the experiment.
Fig. 3 The mechanical model of soft soil in DEM Table 2 The mesoscopic parameters of soft soil in DEM Parameters value Density [g•cm-3] 2.7 Particle radius [mm] 1.5~2.5 Particle-particle contact normal stiffness [N•m−1] [N•m−1] 1.08×106 Particle-particle contact shear stiffness [N•m−1] 2.42×106 Damping normal factor 0.82 Damping shear factor 0.64 Friction factor 0.51 Normal contact-bond strength [N] 0.60 Shear contact-bond strength [N] 0.55 Base on the soil properties and pressure-sinkage curves in laboratory, the value of the DEM parameters were obtained.
The DEM parameters were obtained base on the soil properties and the pressure-sinkage relationship in laboratory test.
The mechanical properties are list in Table 1.
Table 1 The mechanical properties of the sample soil (lunar soil simulant-1) Parameter Median diameter μm Bulk density g/cm3 d10 μm d30 μm d60 μm Cu Cc value 50 1.10~1.39 4.5 22 75 16.7 1.43 Two plates (45mm and 50mm in diameter) were used in the experiment.
Fig. 3 The mechanical model of soft soil in DEM Table 2 The mesoscopic parameters of soft soil in DEM Parameters value Density [g•cm-3] 2.7 Particle radius [mm] 1.5~2.5 Particle-particle contact normal stiffness [N•m−1] [N•m−1] 1.08×106 Particle-particle contact shear stiffness [N•m−1] 2.42×106 Damping normal factor 0.82 Damping shear factor 0.64 Friction factor 0.51 Normal contact-bond strength [N] 0.60 Shear contact-bond strength [N] 0.55 Base on the soil properties and pressure-sinkage curves in laboratory, the value of the DEM parameters were obtained.
The DEM parameters were obtained base on the soil properties and the pressure-sinkage relationship in laboratory test.
Mechanical and Structural Characterization of Cu-Ni-Ag/Y2O3 Composites Obtained by Powder Metallurgy
Online since: August 2012
Authors: Juan Alfredo Guevara Carrió, Anderson Kenji Okazaki, Marcos Vinícios Surmani Martins, Marcelo Carvalhal, Waldemar Alfredo Monteiro
Consolação 896, 01302-907 - Sao Paulo, Brazil
ajgcarrio@mackenzie.br
Keywords: Composites, Cu-Ni-Ag/Y2O3, Rietveld Method, electrical and thermal properties, synchrotron radiation.
Structural and electrical properties of the anode materials determine the long-term performance of fuel cells.
High electrical conductivity and high activity of electrochemical reactions and hydrocarbon fuel reforming are the fundamental properties of these materials.
The cell parameters and profile refinements indicate that the thermal and mechanical treatments affect the copper crystalline structure, causing internal strengths.
Withers, Cambridge solid state science series, Cambridge University Press 1993, ISBN 0-521-41808-9 [3] Materials Science and Engineering A, Volume 277, Issues 1-2, 31 January 2000, Pages 297-304, Microstructure and mechanical properties of magnesium containing high volume fractions of yttria dispersoids, B.
Structural and electrical properties of the anode materials determine the long-term performance of fuel cells.
High electrical conductivity and high activity of electrochemical reactions and hydrocarbon fuel reforming are the fundamental properties of these materials.
The cell parameters and profile refinements indicate that the thermal and mechanical treatments affect the copper crystalline structure, causing internal strengths.
Withers, Cambridge solid state science series, Cambridge University Press 1993, ISBN 0-521-41808-9 [3] Materials Science and Engineering A, Volume 277, Issues 1-2, 31 January 2000, Pages 297-304, Microstructure and mechanical properties of magnesium containing high volume fractions of yttria dispersoids, B.
Online since: February 2014
Authors: Qian Tan, Ying Min Li, Chuan Guo Jia
The mechanical properties, deformation and damage form of embedded parts were investigated.Experimental results indicate that it has good mechanical properties and favorable deformation performance under tensile and shear loads in normal work.
But its mechanical properties have no testing and passing any inspection of project, which will bring a lot of limitations and uncertainty in application.
In this paper, in order to figure out the mechanical properties, deformation and failure pattern of channel embedded part, experimental research were carried out.
So as to prevent concrete from entering into the channel and affecting the test proceeding.
It has good mechanical properties and favorable deformation performance under tensile and shear loads in normal work.
But its mechanical properties have no testing and passing any inspection of project, which will bring a lot of limitations and uncertainty in application.
In this paper, in order to figure out the mechanical properties, deformation and failure pattern of channel embedded part, experimental research were carried out.
So as to prevent concrete from entering into the channel and affecting the test proceeding.
It has good mechanical properties and favorable deformation performance under tensile and shear loads in normal work.
Online since: June 2013
Authors: Fernanda de Souza de Souza Royse, Hector Reynaldo Meneses Costa, Ivan Napoleão Bastos
The physical properties of coatings were additionally evaluated by microhardness measurement and dilution quantification.
Thus, albeit some metallurgical advantages of Co-alloys, the study of microstructures is always necessary to maintain their good mechanical properties.
Methodology This work analyzes the correlation between welding parameters and the microstructural and mechanical properties of alloy Ultimet® on steel substrate, using the conventional GTAW process.
It reduces corrosion resistance properties and causes other metallurgical problems.
Among several factors that affect the weldability of Co alloys, a careful control of heat input is required to avoid high dilution and the consequent occurrence of solidification cracks [15].
Thus, albeit some metallurgical advantages of Co-alloys, the study of microstructures is always necessary to maintain their good mechanical properties.
Methodology This work analyzes the correlation between welding parameters and the microstructural and mechanical properties of alloy Ultimet® on steel substrate, using the conventional GTAW process.
It reduces corrosion resistance properties and causes other metallurgical problems.
Among several factors that affect the weldability of Co alloys, a careful control of heat input is required to avoid high dilution and the consequent occurrence of solidification cracks [15].
Online since: July 2011
Authors: Shabnam Hosseini, Mohammad Bagher Limooei
It's necessary to pay attention these notchs,because they affect on fatigue resistance[3].
Therefore, the fatigue properties of Ti-6Al-4V alloy is so notable.Titanium and it's alloys have the similar properties of fatigue with steel alloys.
Fatigue notch factor is dependent not only upon the component geometry but also on the material properties and the mode of loading[2].
When the theoritical stress concentration factor equals the fatigue notch factor, q =1.
Presence of notch in Ti-6Al-4V alloy, doesn’t affect the fatigue crack growth behavior, under the condition of HCF and LCF.
Therefore, the fatigue properties of Ti-6Al-4V alloy is so notable.Titanium and it's alloys have the similar properties of fatigue with steel alloys.
Fatigue notch factor is dependent not only upon the component geometry but also on the material properties and the mode of loading[2].
When the theoritical stress concentration factor equals the fatigue notch factor, q =1.
Presence of notch in Ti-6Al-4V alloy, doesn’t affect the fatigue crack growth behavior, under the condition of HCF and LCF.
Online since: October 2017
Authors: S. Nallusamy, M. Saravanakumar, B. Sathis Kumar
Types of Insulator Materials: The insulators preferably should have the desirable properties of high mechanical strength, high electrical resistance, high relative permittivity and high dielectric strength.
Types of Pollution: A particular region and pollution type are inter-related with the basic source of contamination along with the weather factors of that place.
These materials should possess good insulating properties over a wide range of operating parameters.
Nallusamy, (2016), “A review on the effects of casting quality, microstructure and mechanical properties of cast Al-Si-0.3Mg alloy”, International Journal of Performability Engineering, Vol. 12(2), Pp. 143-154 [3] S.
Nallusamy and Gautam Majumdar, (2016), “Effect of stacking sequence and hybridization on mechanical properties of jute-glass fiber composites”, International Journal of Performability Engineering, Vol. 12(3), Pp. 229-239 [14] Zafer and M.
Types of Pollution: A particular region and pollution type are inter-related with the basic source of contamination along with the weather factors of that place.
These materials should possess good insulating properties over a wide range of operating parameters.
Nallusamy, (2016), “A review on the effects of casting quality, microstructure and mechanical properties of cast Al-Si-0.3Mg alloy”, International Journal of Performability Engineering, Vol. 12(2), Pp. 143-154 [3] S.
Nallusamy and Gautam Majumdar, (2016), “Effect of stacking sequence and hybridization on mechanical properties of jute-glass fiber composites”, International Journal of Performability Engineering, Vol. 12(3), Pp. 229-239 [14] Zafer and M.
Online since: June 2013
Authors: Jun Wang, Hong Guang Ji
Among the factors related to rock slope stability, structural factors such as joints proves to be the most unfavorable.
For this highly jointed rock slope of open pit, the joint has become one of the main factors affecting slope stability, thus it is necessary to conduct qualitative and quantitative analysis for the stepped slope stability which is under control of the joint.
From this point of view, this paper will use the safety factors obtained from generalized limit equilibrium method (GLE) and Morgenstern-Price method as the basis of safety analysis.
Under the strong vibration condition, rock mass sliding force increases with the rising of vibration acceleration, which is one of the extrinsic factors resulting in landslide.
(1) Blasting is a common way of exploitation in mining area, therefore the blasting vibration effect is a significant factor affecting slope stability.
For this highly jointed rock slope of open pit, the joint has become one of the main factors affecting slope stability, thus it is necessary to conduct qualitative and quantitative analysis for the stepped slope stability which is under control of the joint.
From this point of view, this paper will use the safety factors obtained from generalized limit equilibrium method (GLE) and Morgenstern-Price method as the basis of safety analysis.
Under the strong vibration condition, rock mass sliding force increases with the rising of vibration acceleration, which is one of the extrinsic factors resulting in landslide.
(1) Blasting is a common way of exploitation in mining area, therefore the blasting vibration effect is a significant factor affecting slope stability.
Online since: October 2023
Authors: Leonardo Giannini, Antonio Alvaro, Alessandro Campari, Nicola Paltrinieri
To obtain an optimal combination between mechanical properties such as strength, fracture toughness and weldability, high efforts have been put to improve steels characteristics.
Higher grades present more fine-grained microstructures, such as mixtures of ferrite-bainite and ferrite-acicular ferrite, which allow them to gain superior mechanical properties [7].
Therefore, the loss of mechanical properties could occur after a different amount of time and with a different magnitude. 3.3: Hydrogen effect on Heat-Affected Zones.
Hydrogen Influence on Mechanical Properties of Pipeline Steels.
“Use of existing steel pipeline infrastructure for gaseous hydrogen storage and transport: A review of factors affecting hydrogen induced degradation”.
Higher grades present more fine-grained microstructures, such as mixtures of ferrite-bainite and ferrite-acicular ferrite, which allow them to gain superior mechanical properties [7].
Therefore, the loss of mechanical properties could occur after a different amount of time and with a different magnitude. 3.3: Hydrogen effect on Heat-Affected Zones.
Hydrogen Influence on Mechanical Properties of Pipeline Steels.
“Use of existing steel pipeline infrastructure for gaseous hydrogen storage and transport: A review of factors affecting hydrogen induced degradation”.
Online since: May 2012
Authors: Feng Tian, Kai Tuo Zhang, Yan Rong Ni, Chao Hua Su
The product properties were tested.
The testing of the physical and mechanical properties of the testing sample is based on the GB/T 8815-2002 [1] standards, and the testing of the environmental protection properties of the testing sample is based on the IEC 62321ED.1111/54/CDV standards.
To obtain good electrical insulation properties and good physical and mechanical properties for the sheathing compound, we need to choose high efficiency plasticizer with good thermal stability and low volatilization rate.
Considering various factors the appropriate amount of environmental stabilizer added should be about 8 Phr.
Properties of the cable sheathing compound.
The testing of the physical and mechanical properties of the testing sample is based on the GB/T 8815-2002 [1] standards, and the testing of the environmental protection properties of the testing sample is based on the IEC 62321ED.1111/54/CDV standards.
To obtain good electrical insulation properties and good physical and mechanical properties for the sheathing compound, we need to choose high efficiency plasticizer with good thermal stability and low volatilization rate.
Considering various factors the appropriate amount of environmental stabilizer added should be about 8 Phr.
Properties of the cable sheathing compound.
Online since: October 2011
Authors: Peerapong Tua-Ngam, Theeralaksna Suddhasthira, Niwat Anuwongnukroh, Vantida Jittanonda, Wassana Wichai, Surachai Dechkunakorn
This study aimed to investigate the in vitro mechanical properties of Thai non latex orthodontic elastics and compare these mechanical properties to commercial natural latex orthodontic elastics.
In real practice, elastics are exposed to numerous intraoral factors, e.g., saliva, as well as the movement of the jaws in their normal functions.
In summarize, Thai nonlatex elastics are not comparable to latex elastics regarding mechanical properties.
The mechanical properties among five brands of orthodontic elastics were noticeablydifferent.Thainonlatex elastics had significantly different mechanical properties from natural latex elasticsas reported in previous studies.
In vitro assessment of the mechanical properties of latex and non-latex orthodontic elastics.
In real practice, elastics are exposed to numerous intraoral factors, e.g., saliva, as well as the movement of the jaws in their normal functions.
In summarize, Thai nonlatex elastics are not comparable to latex elastics regarding mechanical properties.
The mechanical properties among five brands of orthodontic elastics were noticeablydifferent.Thainonlatex elastics had significantly different mechanical properties from natural latex elasticsas reported in previous studies.
In vitro assessment of the mechanical properties of latex and non-latex orthodontic elastics.