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Online since: November 2018
Authors: Salima Aggoun, F. Mostefa, H.A. Mesbah, D. Mekhatria, Nasr Eddine Bouhamou
For one or the other the results are different as regards the mechanical properties and microstructure.
Mechanical Properties Fig 11 shows that mortar samples (SC5) exhibit the best mechanical performance at 7 and 28 days compared to mortar samples (SC3) and (SC4).
This phenomenon generally causes the degradation of the binder and leads to falls in final resistances Fig. 13: Mortar samples SC5 Fig.14: Efflorescence geopolymer specimens The content of Na2O (contained in the alkaline solution) is considered as a determining factor affecting the mechanical properties.
Wang : Thermal behavior and mechanical properties of geopolymer mortar after exposure to elevated temperatures, Constr.
Chaudhary: Mechanism of geopolymerization and factors influencing its development: a review.
Mechanical Properties Fig 11 shows that mortar samples (SC5) exhibit the best mechanical performance at 7 and 28 days compared to mortar samples (SC3) and (SC4).
This phenomenon generally causes the degradation of the binder and leads to falls in final resistances Fig. 13: Mortar samples SC5 Fig.14: Efflorescence geopolymer specimens The content of Na2O (contained in the alkaline solution) is considered as a determining factor affecting the mechanical properties.
Wang : Thermal behavior and mechanical properties of geopolymer mortar after exposure to elevated temperatures, Constr.
Chaudhary: Mechanism of geopolymerization and factors influencing its development: a review.
Online since: September 2014
Authors: Yun Bo Xu, Yuan Xiang Zhang, Li Guo Wu, Yang Wang, Li Qing Chen, Yong Mei Yu, Guo Dong Wang
Grain size, crystallographic texture and precipitation are the main factor for controlling the magnetic properties of non-oriented silicon steels.
Recently, various works have been carried out aiming at improving the magnetic properties [1-3].
Magnetic properties were measured by using a sheet tester in rolling direction with the size of 30mm×100mm.
It can conclude that the magnetic properties of WC sheets are more excellent than that of AC sheets.
Microstructure, texture and magnetic properties of strip-cast 1.3% Si non-oriented electrical steels.
Recently, various works have been carried out aiming at improving the magnetic properties [1-3].
Magnetic properties were measured by using a sheet tester in rolling direction with the size of 30mm×100mm.
It can conclude that the magnetic properties of WC sheets are more excellent than that of AC sheets.
Microstructure, texture and magnetic properties of strip-cast 1.3% Si non-oriented electrical steels.
Online since: October 2018
Authors: E.G. Gazenaur, L.V. Kuzmina, A.P. Rodzevich, E.V. Sugatov, V.I. Krasheninin
The Effect of Magnetic Field on Crystallization and Some Properties of Silver Azide Crystals
A.P.
Introduction A magnetic field is one of factors relevant to crystallization alongside with concentration of input reagents temperature acidity of the reaction environment, and availability of complexing agents etc.
Furthermore, magnetic treatment changes some physical properties of systems (electrical conductivity, density, surface tension, dielectric permeability, magnetic susceptibility, and viscosity) [2,4].
The properties above relax gradually for some months (at least 6).
The characteristics of samples are modified and tend to have properties uncharacteristic for this class of materials (initiating explosives).
Introduction A magnetic field is one of factors relevant to crystallization alongside with concentration of input reagents temperature acidity of the reaction environment, and availability of complexing agents etc.
Furthermore, magnetic treatment changes some physical properties of systems (electrical conductivity, density, surface tension, dielectric permeability, magnetic susceptibility, and viscosity) [2,4].
The properties above relax gradually for some months (at least 6).
The characteristics of samples are modified and tend to have properties uncharacteristic for this class of materials (initiating explosives).
Online since: June 2011
Authors: Xi Peng Xu, Yan Hui Wang, Jing Lu
In SiC whisker reinforced Al matrix composite, the interface reaction significantly influences the property of the composite.
Recently, silicon carbide whiskers have attracted much more attention due to the unique combination of their excellent properties, such as high strength, high elastic modulus, low thermal expansion coefficient, low density, high oxidation resistance and chemical inertness, causing significant improvements in mechanical performance of the composites [1-3].
Compared to unreinforced aluminum alloys, silicon carbide whisker reinforced aluminum (SiCw/Al) composite satisfies the demands in strength, modulus, fatigue resistance, tribological properties and has been considered as a great potential in structural materials, aerospace and electronic industries [4,5].
Therefore, it is very substantial to understand the structure and behavior of reinforcement/matrix interface since it strongly influences the physical and mechanical properties of the composites.
There are several factors affecting the interfacial microstructure, including matrix chemistry, whisker surface chemistry, whisker morphology and thermal expansion mismatches between whisker and matrix.
Recently, silicon carbide whiskers have attracted much more attention due to the unique combination of their excellent properties, such as high strength, high elastic modulus, low thermal expansion coefficient, low density, high oxidation resistance and chemical inertness, causing significant improvements in mechanical performance of the composites [1-3].
Compared to unreinforced aluminum alloys, silicon carbide whisker reinforced aluminum (SiCw/Al) composite satisfies the demands in strength, modulus, fatigue resistance, tribological properties and has been considered as a great potential in structural materials, aerospace and electronic industries [4,5].
Therefore, it is very substantial to understand the structure and behavior of reinforcement/matrix interface since it strongly influences the physical and mechanical properties of the composites.
There are several factors affecting the interfacial microstructure, including matrix chemistry, whisker surface chemistry, whisker morphology and thermal expansion mismatches between whisker and matrix.
Online since: July 2012
Authors: Chuan Shun Zhu, Jian Bin Xu, Mei Hua Yu, Wei Zhao, Yan Zhang, Fang Lian Yao, Jun Yang
Owe to the hydrophobic-bind property of the Fc domain, the VEGF-Fc is efficiently immobilized on the surface of porous polycaprolactone (PCL) scaffold in our study.
To enhance the angiogenesis in scaffold, various strategies have been devised to immobilize pro-angiogenic growth factors, such as encapsulation in microsphere [1], entrapment in hydrogel [2], covalent [3] or electrostatic binding [4], the problem of inadequate blood vessels within scaffolds still remains at large.
In addition, it is confirmed in our previous studies that the VEGF-Fc not only promote cell adhesion and proliferation, but also affect cell morphology and other biological functions.
We chose to use porous PCL scaffolds because of its good biodegradability and mechanical properties suitable for tissue engineering to support the growth of various cells.
Name of experimental group Amount of growth factor in immobilization solution (ng/scaffold) Amount of growth factor immobilized in PCL scaffolds (ng/scaffold) Immobilization rate (%) PBS - - - VEGF 200 20.43±3.35 10.2±0.017 VEGF-Fc 200 193.2±2.26 96.6±0.011 Distribution of immobilized VEGF-Fc in PCL scaffolds.
To enhance the angiogenesis in scaffold, various strategies have been devised to immobilize pro-angiogenic growth factors, such as encapsulation in microsphere [1], entrapment in hydrogel [2], covalent [3] or electrostatic binding [4], the problem of inadequate blood vessels within scaffolds still remains at large.
In addition, it is confirmed in our previous studies that the VEGF-Fc not only promote cell adhesion and proliferation, but also affect cell morphology and other biological functions.
We chose to use porous PCL scaffolds because of its good biodegradability and mechanical properties suitable for tissue engineering to support the growth of various cells.
Name of experimental group Amount of growth factor in immobilization solution (ng/scaffold) Amount of growth factor immobilized in PCL scaffolds (ng/scaffold) Immobilization rate (%) PBS - - - VEGF 200 20.43±3.35 10.2±0.017 VEGF-Fc 200 193.2±2.26 96.6±0.011 Distribution of immobilized VEGF-Fc in PCL scaffolds.
Online since: May 2011
Authors: Jian Ying Shen, Ji Wu Li
Of course, the fretting properties of Zr-alloy would be examined precisely before the construction of power stations.
As the mechanical condition keeps constant, the contribution of mechanical factor is thought to be constant.
The friction is considerably affected by the surface condition.
From the polarization curve, Zr-alloy has almost the same static and dynamic corrosion properties as SUS304 in Na2SO4 solution. 2.
Hori: Tribological Properties of SUS304 Steel in Seawater, JSMEInt’l, Jour.
As the mechanical condition keeps constant, the contribution of mechanical factor is thought to be constant.
The friction is considerably affected by the surface condition.
From the polarization curve, Zr-alloy has almost the same static and dynamic corrosion properties as SUS304 in Na2SO4 solution. 2.
Hori: Tribological Properties of SUS304 Steel in Seawater, JSMEInt’l, Jour.
Online since: September 2011
Authors: Yu Hou Wu, Li Yan Wang, Li Xiu Zhang
The air-gap is changed due to the influence from various factors not only the tolerance of the manufacture and assembly of motorized spindle but also different working condition.
Its dynamic properties play a very important role on performance of high-speed machine tools.
Vibration performance of Motorized spindle affected the processing quality directly.
There are three factors impact on air-gap change, such as temperature of motorized spindle, tolerance of the manufacture and assembly and the eccentricity between the stator and rotor.
Knight, A.M. et al. studied change of air-gap due to mechanical fault by monitoring Stator current [2].
Its dynamic properties play a very important role on performance of high-speed machine tools.
Vibration performance of Motorized spindle affected the processing quality directly.
There are three factors impact on air-gap change, such as temperature of motorized spindle, tolerance of the manufacture and assembly and the eccentricity between the stator and rotor.
Knight, A.M. et al. studied change of air-gap due to mechanical fault by monitoring Stator current [2].
Online since: January 2013
Authors: Bo Qiang Shi, Yun Tao Cai
The biggest advantage of fiber reinforced composite is light mass, for example, the golf shaft which made by carbon fiber reinforced composite, and apply carbon fiber cloth tape molding method, is 30%~ 50% lighter than the metal rod one, while its mechanical properties is highly improved compared with metal rods.
Mechanical Properties.
Strength, toughness, elasticity and other mechanical properties factors should be taken into account when we use sport equipment.
The mechanical properties of common materials are shown in Table 1.
Table 1 The mechanical properties of common materials Material Specific strength, Mpa Specific modulus, Mpa Timber 215.6 18620 Carbon steel 176.4 24500 glass fiber/epoxy 607.6 23520 Boron fiber/epoxy 607.6 98000 Aramid fiber/epoxy 842.8 49000 Carbon fiber(HT) /epoxy 1274.0 88200 Carbon fiber(HM) /epoxy 784.0 156800 Types of sports equipment with fiber reinforced composite There are wide variety of sports equipments, Here are several sports equipments which are made by fiber-reinforced composite materials.
Mechanical Properties.
Strength, toughness, elasticity and other mechanical properties factors should be taken into account when we use sport equipment.
The mechanical properties of common materials are shown in Table 1.
Table 1 The mechanical properties of common materials Material Specific strength, Mpa Specific modulus, Mpa Timber 215.6 18620 Carbon steel 176.4 24500 glass fiber/epoxy 607.6 23520 Boron fiber/epoxy 607.6 98000 Aramid fiber/epoxy 842.8 49000 Carbon fiber(HT) /epoxy 1274.0 88200 Carbon fiber(HM) /epoxy 784.0 156800 Types of sports equipment with fiber reinforced composite There are wide variety of sports equipments, Here are several sports equipments which are made by fiber-reinforced composite materials.
Online since: June 2015
Authors: Jong Do Kim, So Young Choi, Pyung Su Kim, Young Sik Kim
Furthermore this material maintains good mechanical properties across a wide range of temperatures from ultra-low temperatures up to temperature approaching 500 °C.
Therefore, the purpose of this study is to develop an optimal welding method for INCOLOY 825 and STS316L special materials for use at low temperatures by deducing and controlling the welding governing factors and to evaluate the product reliability.
To that end, the authors identified the mechanical properties of the weldment of a cryogenic film material and the weldment of a flange attached onto bellows by measuring the tensile strength and hardness.
Here, we execute butt welding on 0.8 mm-thick STS316L and INCOLOY 825 material using plasma heat source to determine the optimal welding parameters of bellows by evaluating the mechanical properties and formability of the materials2).
Conclusion In this study, the mechanical properties and micro-structure of a bellows joint and a flange joint were analyzed for use as an expansion joint for LNG carriers, which used STS316L and INCOLOY 825.
Therefore, the purpose of this study is to develop an optimal welding method for INCOLOY 825 and STS316L special materials for use at low temperatures by deducing and controlling the welding governing factors and to evaluate the product reliability.
To that end, the authors identified the mechanical properties of the weldment of a cryogenic film material and the weldment of a flange attached onto bellows by measuring the tensile strength and hardness.
Here, we execute butt welding on 0.8 mm-thick STS316L and INCOLOY 825 material using plasma heat source to determine the optimal welding parameters of bellows by evaluating the mechanical properties and formability of the materials2).
Conclusion In this study, the mechanical properties and micro-structure of a bellows joint and a flange joint were analyzed for use as an expansion joint for LNG carriers, which used STS316L and INCOLOY 825.
Online since: September 2007
Authors: Norio Kawagoishi, Eiji Kondo, Takanori Nagano, M. Moriyama
The S-N curves showed
duplex S-N properties because of the transition of fracture origin from the specimen surface in
the short life region to the subsurface in the long life one.
However, the fatigue strength, which is the most important property for structural steels, is very low in comparison with the higher static strength similar to other high strength steels.
The mechanical properties of aged specimen were 0.2% proof stress: 2065 MPa, tensile strength: 2151MPa and reduction of area: 47%.
On the other hand, residual stress affects the crack propagation, and the nearer to the specimen surface the compressive residual stress, the larger the suppression effect on the propagation of a surface crack [4].
This means that mechanical severity and resistance of material near the origin of fracture are important.
However, the fatigue strength, which is the most important property for structural steels, is very low in comparison with the higher static strength similar to other high strength steels.
The mechanical properties of aged specimen were 0.2% proof stress: 2065 MPa, tensile strength: 2151MPa and reduction of area: 47%.
On the other hand, residual stress affects the crack propagation, and the nearer to the specimen surface the compressive residual stress, the larger the suppression effect on the propagation of a surface crack [4].
This means that mechanical severity and resistance of material near the origin of fracture are important.