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Online since: June 2014
Authors: Hideki Araki, Masataka Mizuno, Yasuhiro Aruga, Katsushi Matsumoto, Hikaru Iwai, Hidemasa Tsuneishi
In addition to these mechanical properties, surface quality is important and much attention has been paid on the serrated flow phenomena and the related surface markings in forming process [1].
As for the microstructural factors, precipitates which are formed during natural or artificial aging before deformation may be responsible for the DSA by interacting the dislocations during deformation.
Fig.2 shows the mechanical properties for the specimens after natural aging for various times.
Fig.6 shows the mechanical properties and electrical conductivity for the specimens 0Z and 3Z after artificial aging at several temperatures.
The T’ phase precipitates are coarsened and their population are reduced after artificial aging at higher temperature, which affects the mechanical properties such as 0.2% proof stress as shown in Fig.6(a).
As for the microstructural factors, precipitates which are formed during natural or artificial aging before deformation may be responsible for the DSA by interacting the dislocations during deformation.
Fig.2 shows the mechanical properties for the specimens after natural aging for various times.
Fig.6 shows the mechanical properties and electrical conductivity for the specimens 0Z and 3Z after artificial aging at several temperatures.
The T’ phase precipitates are coarsened and their population are reduced after artificial aging at higher temperature, which affects the mechanical properties such as 0.2% proof stress as shown in Fig.6(a).
Online since: February 2013
Authors: Kai Ming Xie
Usually Intumescent flame retardant contains three types of components which are agents, carbide catalyst and expansive agent, more than ever, of ammonium polyphosphate (APP), polyol and melamine composite components; the disadvantage is prone to alcohol between polyol and APP The decomposition reaction, and the polyol itself is easy to absorb moisture, which affects the properties of the materials.
Catalytic intumescent flame retardant can promote degradation, reducing thermal degradation of the speed of the substrate, increase the amount of carbon residue of the substrate, i.e. combustion formed in the substrate surface, the carbon layer of the oxygen barrier of a layer of insulation, charring agent added not improve the amount of residual carbon, able to promote the formation of the carbon layer, and to improve the quality of the carbon layer, and plays an important role for the improvement of flame retardant properties of flame retardant material Formulations of different flame retardants and fire-retardant material consisting absorbent experiment found that the char-forming agent to be added to improve the water absorption of the flame retardant material, but did not increase, and still meet the requirements of use of the humidity condition.
The mechanical properties of different flame retardant formulations and the composition of the flame-retardant material, flame retardants added deterioration of the mechanical properties of the matrix, charring agent added, have little effect on the mechanical properties, mechanical properties from The main factors in the APP.
Instrument: a three-necked flask, reflux condenser, thermometer, mechanical stirrer, regulator, oil bath, iron sets, rubber tubes, catheters, beakers, vacuum drying oven, the 1710 type Fourier transform infrared spectrometer, WC 21-type display micro melting point apparatus, Shanghai Optical Instrument Factory.
Reactive material ratio of the yield Reaction temperature n (PDD) / n (melamine) Product quality Yield 1:2.2 1:2.4 1:2.5 1:2.6 1.4 1.5 1.7 1.5 66.2% 71.0% 80.4% 71.0% Experimental results show that the ratio of the amount of substance of the PDD and melamine is 1:2.5 when the top The Effect of Reaction Temperature PDD with melamine substance than 1: 2.5, investigated the influence of the reaction temperature on the product recovery, fierce as PDD and melamine reaction, the reaction temperature should not be higher than 600 C, the reaction temperature is too high, the solvent is easy to Volatile affect the reaction carried out.
Catalytic intumescent flame retardant can promote degradation, reducing thermal degradation of the speed of the substrate, increase the amount of carbon residue of the substrate, i.e. combustion formed in the substrate surface, the carbon layer of the oxygen barrier of a layer of insulation, charring agent added not improve the amount of residual carbon, able to promote the formation of the carbon layer, and to improve the quality of the carbon layer, and plays an important role for the improvement of flame retardant properties of flame retardant material Formulations of different flame retardants and fire-retardant material consisting absorbent experiment found that the char-forming agent to be added to improve the water absorption of the flame retardant material, but did not increase, and still meet the requirements of use of the humidity condition.
The mechanical properties of different flame retardant formulations and the composition of the flame-retardant material, flame retardants added deterioration of the mechanical properties of the matrix, charring agent added, have little effect on the mechanical properties, mechanical properties from The main factors in the APP.
Instrument: a three-necked flask, reflux condenser, thermometer, mechanical stirrer, regulator, oil bath, iron sets, rubber tubes, catheters, beakers, vacuum drying oven, the 1710 type Fourier transform infrared spectrometer, WC 21-type display micro melting point apparatus, Shanghai Optical Instrument Factory.
Reactive material ratio of the yield Reaction temperature n (PDD) / n (melamine) Product quality Yield 1:2.2 1:2.4 1:2.5 1:2.6 1.4 1.5 1.7 1.5 66.2% 71.0% 80.4% 71.0% Experimental results show that the ratio of the amount of substance of the PDD and melamine is 1:2.5 when the top The Effect of Reaction Temperature PDD with melamine substance than 1: 2.5, investigated the influence of the reaction temperature on the product recovery, fierce as PDD and melamine reaction, the reaction temperature should not be higher than 600 C, the reaction temperature is too high, the solvent is easy to Volatile affect the reaction carried out.
Online since: June 2015
Authors: A.B. Efremenkov, Denis V. Valuev, R.A. Gizatulin, A.V. Valueva, S.N. Fedoseev
The effect of simultaneous adding of calcium, aluminum and titanium to sv.08G2S steel in a ladle during tapping from an arc furnace on mechanical properties and nonmetallic impurity has been studied [2].
Mechanical properties were determined on Ø 6.5 mm wire rod and wire of Ø 1.2; 1.6; 2.0 and 3.5 mm after hot working.
Titanium has the most considerable impact on mechanical properties of wire rods.
In the case of wire, various types of de-oxidizers continue the pattern of influence on the mechanical properties in general, but this influence is much weaker than that of in wire rods.
The effect of the simultaneous addition of calcium, aluminum and titanium to steel on mechanical properties and nonmetallic impurity in final rolled steel has been studied.
Mechanical properties were determined on Ø 6.5 mm wire rod and wire of Ø 1.2; 1.6; 2.0 and 3.5 mm after hot working.
Titanium has the most considerable impact on mechanical properties of wire rods.
In the case of wire, various types of de-oxidizers continue the pattern of influence on the mechanical properties in general, but this influence is much weaker than that of in wire rods.
The effect of the simultaneous addition of calcium, aluminum and titanium to steel on mechanical properties and nonmetallic impurity in final rolled steel has been studied.
Online since: October 2015
Authors: Jie Xiong, Lin Qi, Li Xin Song, Xin Fei Zhao, Chang Jiang Fang, Xing Ran Lin
How might the change in mechanical properties promoted by the Al2O3 adversely affect the physical attributes of the CNFs that are desirable in the first place?
Also, the author did not mention anything about the nanofiber orientation effect for the mechanical properties.
Such as: “Zhang, H., Ding, W., Aidun, D.K., Mechanical Properties of Crystalline Silicon Carbide (SiC) Nanowires, J.
Although these papers focus on the mechanical properties of single nanofiber or nanowire, they are instructive to our study on the mechanical properties of nanofibers films.
Poor mechanical properties of single nanofiber probably result in poor mechanical properties of nanofiber films.
Also, the author did not mention anything about the nanofiber orientation effect for the mechanical properties.
Such as: “Zhang, H., Ding, W., Aidun, D.K., Mechanical Properties of Crystalline Silicon Carbide (SiC) Nanowires, J.
Although these papers focus on the mechanical properties of single nanofiber or nanowire, they are instructive to our study on the mechanical properties of nanofibers films.
Poor mechanical properties of single nanofiber probably result in poor mechanical properties of nanofiber films.
Online since: December 2014
Authors: Xing Hua Xie, Kang Xu, Hui Sheng Zhou
Compatibility and safety systems research and production equipment and technology of explosives between itself, the establishment and development of the explosion mechanism of explosive accidents and prevent the occurrence of accidental explosion of explosives to achieve disaster prevention and reduction, to ensure the safety of personnel and minimize property damage.
Statistics show that: From 1988 to 1995, Sweden, Canada, South Africa, Russia, Papua New Guinea and other countries emulsion explosive explosion occurred 10 cases, the death of 38 people, also seriously affect public safety.
In summary, the memory emulsifier thermal decomposition of ammonium nitrate in causing factors produced by the thermal decomposition of the gas so that the substrate is sensitized emulsion, the emulsion is heat accelerate the decomposition of the body cavity or the abnormal situation formation of hot spots is the cause of the emulsion explosive (Matrix) the main reason for the explosion.
Factors affecting the accumulation of explosive system has a lot of heat, is now on the incorporation of impurities within the emulsifier emulsion explosives emulsion process, analyze aspects of mechanical rotation and thermal conditions and their own sense of emulsion explosives and so on.
Memory emulsified thermal decomposition of ammonium nitrate in causing factors produced by the thermal decomposition of the gas so that the substrate is sensitized emulsion, the emulsion is heat accelerate the decomposition of the body cavity or the abnormal situation formation of hot spots is the cause of the emulsion explosive (the matrix) the main explosion the reason.
Statistics show that: From 1988 to 1995, Sweden, Canada, South Africa, Russia, Papua New Guinea and other countries emulsion explosive explosion occurred 10 cases, the death of 38 people, also seriously affect public safety.
In summary, the memory emulsifier thermal decomposition of ammonium nitrate in causing factors produced by the thermal decomposition of the gas so that the substrate is sensitized emulsion, the emulsion is heat accelerate the decomposition of the body cavity or the abnormal situation formation of hot spots is the cause of the emulsion explosive (Matrix) the main reason for the explosion.
Factors affecting the accumulation of explosive system has a lot of heat, is now on the incorporation of impurities within the emulsifier emulsion explosives emulsion process, analyze aspects of mechanical rotation and thermal conditions and their own sense of emulsion explosives and so on.
Memory emulsified thermal decomposition of ammonium nitrate in causing factors produced by the thermal decomposition of the gas so that the substrate is sensitized emulsion, the emulsion is heat accelerate the decomposition of the body cavity or the abnormal situation formation of hot spots is the cause of the emulsion explosive (the matrix) the main explosion the reason.
Online since: January 2016
Authors: Shu Cai Yang, Xiao Yang Cui, Zhi Wei Wang, Yu Hua Zhang
Tool wear is easy occurred in titanium alloy milling process which will affect the surface quality.
Therefore, the study on the relationship between tool wear and surface quality is significant for improving the surface integrity and fatigue property.
The influence of flank wear on surface qualities and chip morphology are analyzed through milling single factor experiment of the maximum flank wear.
These defects will cause stress concentration, partial wear increases, deteriorate properties of parts and affect service performance and life of parts.
Chips morphology is one of the most important factors that will affect the surface quality [14].
Therefore, the study on the relationship between tool wear and surface quality is significant for improving the surface integrity and fatigue property.
The influence of flank wear on surface qualities and chip morphology are analyzed through milling single factor experiment of the maximum flank wear.
These defects will cause stress concentration, partial wear increases, deteriorate properties of parts and affect service performance and life of parts.
Chips morphology is one of the most important factors that will affect the surface quality [14].
Online since: January 2010
Authors: Sandra M. Luz, Paulo M.C. Ferrão, C. Alves, M. Freitas, Armand Caldeira-Pires
To achieve the goals of this study, the tensile and flexural properties and Life
Cycle Assessment (LCA) as a function of fiber content were performed.
Besides the good mechanical properties, natural fiber composites showed great environmental performance during the entire life cycle, mainly in the cultivation phase, when sugarcane consumes carbon while growing, contributing to global warming decreases.
By-products, like sugarcane bagasse, can be considered either as waste, affecting the environment, or as a resource when an appropriate valorization technology is implemented.
[8] ASTM D 638: Standard test methods for tensile properties of plastics (Philadelphia 1988)
[9] ASTM D 790: Standard test methods for flexural properties of unreinforced and reinforced plastics and electrical insulating materials (Philadelphia 1988)
Besides the good mechanical properties, natural fiber composites showed great environmental performance during the entire life cycle, mainly in the cultivation phase, when sugarcane consumes carbon while growing, contributing to global warming decreases.
By-products, like sugarcane bagasse, can be considered either as waste, affecting the environment, or as a resource when an appropriate valorization technology is implemented.
[8] ASTM D 638: Standard test methods for tensile properties of plastics (Philadelphia 1988)
[9] ASTM D 790: Standard test methods for flexural properties of unreinforced and reinforced plastics and electrical insulating materials (Philadelphia 1988)
Online since: January 2022
Authors: D. Philip Selvaraj, George Pradeep, George Pramod
Heat treatment methods are employed to increase the mechanical properties of these grades.
Nasery et al. [10] investigates the effect of corrosion nature and mechanical properties of AISI 420 MSS by heat treatment.
Experimental results show that corrosion resistance and mechanical properties are improved through optimized heat treatment.
Cutting depth is the main factor affecting cutting force and next to it is speed and then feed.
Chemical composition and mechanical properties of specimen are shown in Table 1 and Table 2 respectively.
Nasery et al. [10] investigates the effect of corrosion nature and mechanical properties of AISI 420 MSS by heat treatment.
Experimental results show that corrosion resistance and mechanical properties are improved through optimized heat treatment.
Cutting depth is the main factor affecting cutting force and next to it is speed and then feed.
Chemical composition and mechanical properties of specimen are shown in Table 1 and Table 2 respectively.
Online since: July 2011
Authors: Yuri V. Petrov, V. Bratov
Petrov1, a and Vladimir Bratov1,b
1Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences
(IPME RAS), Bolshoj pr.
These processes can progress independently or affect each other.
These processes can progress independently or affect each other.
At the same time in some cases one can try to predict behavior of material on a bigger size level using strength properties evaluated on a smaller scale level.
The abovementioned approach based on the criterion introduced above was applied in order to modify material properties.
These processes can progress independently or affect each other.
These processes can progress independently or affect each other.
At the same time in some cases one can try to predict behavior of material on a bigger size level using strength properties evaluated on a smaller scale level.
The abovementioned approach based on the criterion introduced above was applied in order to modify material properties.
Online since: July 2016
Authors: Yuri Kulikov
In the heart of the processes of formation of physical and mechanical properties of secondary lining of underground structures is the residual water-cement ratio, which indicates the extraction of the mixing water of the concrete mixture under the action of external pressure forces.
This leads to deterioration of physical and mechanical properties of the lining in the roof part of the tunnel.
Introduction Many scientists have dedicated their scientific researches to the problem of formation of physical and mechanical properties of secondary lining of underground structures [9], [10], [12], [16].
The analysis of known research [1], [2], [7] and decisions about the influence of water-cement ratio (W/C) for filtration and other properties of the concrete lining of underground structures [4], [5] shows that the main factor affecting the main indicators of residual concrete is water-cement ratio (W/C)br.
Concrete: Microstructure, Properties and Materials. – (3rd ed.). – McGraw-Hill, New York (2006) [17].
This leads to deterioration of physical and mechanical properties of the lining in the roof part of the tunnel.
Introduction Many scientists have dedicated their scientific researches to the problem of formation of physical and mechanical properties of secondary lining of underground structures [9], [10], [12], [16].
The analysis of known research [1], [2], [7] and decisions about the influence of water-cement ratio (W/C) for filtration and other properties of the concrete lining of underground structures [4], [5] shows that the main factor affecting the main indicators of residual concrete is water-cement ratio (W/C)br.
Concrete: Microstructure, Properties and Materials. – (3rd ed.). – McGraw-Hill, New York (2006) [17].