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Online since: February 2016
Authors: Yuriy Yu. Drozdov, Anton Viktorovich Korchmit, Nikita V. Martyushev
In the present paper the significance of the first of these factors has been considered.
The authors ascribe the reduction of mechanical properties and emergence of rising porosity to intense gas emission depending on the casting temperature.
Experimental procedure The results of the study [1] have shown that samples cast at Т = 1190÷1170 °С out of the preliminary overheated alloy up to 1280 °С, possess the highest mechanical properties.
Lead bronzes, Bronze SnPb 8-12 and Bronze SnPb 11-5, provide higher mechanical properties at utmost low values of temperature [2].
At low h values there is significant refinement of dendritic lattice of α-solution, which conditions the increase of mechanical properties [6].
The authors ascribe the reduction of mechanical properties and emergence of rising porosity to intense gas emission depending on the casting temperature.
Experimental procedure The results of the study [1] have shown that samples cast at Т = 1190÷1170 °С out of the preliminary overheated alloy up to 1280 °С, possess the highest mechanical properties.
Lead bronzes, Bronze SnPb 8-12 and Bronze SnPb 11-5, provide higher mechanical properties at utmost low values of temperature [2].
At low h values there is significant refinement of dendritic lattice of α-solution, which conditions the increase of mechanical properties [6].
Online since: May 2016
Authors: Xian Guo Yan, Hong Guo, Shao Hua Zhang, Fei Peng, Jun Ji Li, Zhi Yang Feng
Analysis of the factors affecting wear reliability of high speed steel taps with cryogenic.
Researches of the factors affecting the wear volume of cryogenic tap also study the factors influencing the reliability life of cryogenic tap, based OMG three equations: Eq.1 dealing with the connection between HSS life and its wear, Eq.5 and Eq.6 explaining the relation of wear life parameters of cryogenic tap to max wear volume distribution.
Duan, Micro Structure and Mechanical Properties of High Speed Steel after Cyclic Cryogenic Treatment, Hot Treatment of Mantles. 2008(03): 90-93
Yuan, Effect of Cryogenic Treatment on Mechanical Properties of High-Speed Steel at High Temperature and Room Temperature, Journal of Gansu University of Technology. 2001(03): 19-22
Peter, Influence of deep cryogenic treatment of high speed steel substrate on TiAlN coating properties, Werkstofftech. 2013, 44(12)
Researches of the factors affecting the wear volume of cryogenic tap also study the factors influencing the reliability life of cryogenic tap, based OMG three equations: Eq.1 dealing with the connection between HSS life and its wear, Eq.5 and Eq.6 explaining the relation of wear life parameters of cryogenic tap to max wear volume distribution.
Duan, Micro Structure and Mechanical Properties of High Speed Steel after Cyclic Cryogenic Treatment, Hot Treatment of Mantles. 2008(03): 90-93
Yuan, Effect of Cryogenic Treatment on Mechanical Properties of High-Speed Steel at High Temperature and Room Temperature, Journal of Gansu University of Technology. 2001(03): 19-22
Peter, Influence of deep cryogenic treatment of high speed steel substrate on TiAlN coating properties, Werkstofftech. 2013, 44(12)
Online since: January 2012
Authors: Yu Mei Ding, Zhi Bian, Peng Cheng Xie, Wei Min Yang
In recent times, microcellular injection molding have attracted great interest due to the considerable enhancement in stiffness, and substantial improvements in mechanical, thermal, and flammability properties while realizing part weight reduction by replacing plastics with the supercritical fluid (SCF).
They showed that the supercritical fluid (SCF) level and injection speed are the most important factors affecting the shrinkage and warpage of microcellular injection molded parts.
It was anticipated that the shrinkage and warpage of the semi-crystalline PP resin would be more significant than amorphous materials, and the glass fiber reinforced PP displayed great enhancement in the mechanics properties.
Table 1 Factors and levels used in this study Factor Injection speed[mm/sec] Injection pressure[bar] Shot temperature[oC] SCF dosage [%] Mold temperature[oC] Cooling time[sec] Level 1 40 60 195 0.2 20 30 Level 2 80 120 205 0.4 40 35 Level 3 120 180 210 0.6 60 40 Table 2 Standard matrix for DOE used for microcellular injection molding No.
As for the other factors, their order of influence was as follows: A was the injection speed, B was the injection pressure, C was the shot temperature, D was the SCF level, E was the mold temperature, and F was the cooling time.
They showed that the supercritical fluid (SCF) level and injection speed are the most important factors affecting the shrinkage and warpage of microcellular injection molded parts.
It was anticipated that the shrinkage and warpage of the semi-crystalline PP resin would be more significant than amorphous materials, and the glass fiber reinforced PP displayed great enhancement in the mechanics properties.
Table 1 Factors and levels used in this study Factor Injection speed[mm/sec] Injection pressure[bar] Shot temperature[oC] SCF dosage [%] Mold temperature[oC] Cooling time[sec] Level 1 40 60 195 0.2 20 30 Level 2 80 120 205 0.4 40 35 Level 3 120 180 210 0.6 60 40 Table 2 Standard matrix for DOE used for microcellular injection molding No.
As for the other factors, their order of influence was as follows: A was the injection speed, B was the injection pressure, C was the shot temperature, D was the SCF level, E was the mold temperature, and F was the cooling time.
Online since: May 2014
Authors: Anne Marie Habraken, Clément Keller, Eric Hug
The mechanical properties are directly linked to the ratio thickness over grain size (t/d ratio) of the parts.
The unexpected fracture is hence due, among other factors, to the erroneous design of the part linked with the softening of the material if dimensions are low.
For these micro-sensors, size effect can also affect the strong coupling which exists between mechanical and electromagnetic properties of materials.
Feaugas, Microstructural size effects on mechanical properties of high purity nickel, Int.
Geiger, Influence of microstructure on the mechanical properties and the forming behaviour of very thin metal foils, Int.
The unexpected fracture is hence due, among other factors, to the erroneous design of the part linked with the softening of the material if dimensions are low.
For these micro-sensors, size effect can also affect the strong coupling which exists between mechanical and electromagnetic properties of materials.
Feaugas, Microstructural size effects on mechanical properties of high purity nickel, Int.
Geiger, Influence of microstructure on the mechanical properties and the forming behaviour of very thin metal foils, Int.
Online since: June 2015
Authors: Oksana Bleikher, Svetlana Kvesko
Introduction
Mechanical engineering is aggressive branch of modern Russia.
Complexity of decision making includes the fact that the Mechanical engineering branch is one of the most industrial productions affecting on other industrial and economic activities and reflects on scientific and technology state, and defense capacity of the state.
It includes given below factors: production constructing, automation of production process, life-time management of production, accounting system and planning of economic financial processes.
For instance, local information systems can be used for solution of conflict of interest in distribution network; survey of medicine experts regarding improvement of consumer properties of equipment for “beauty industry”; local anonymous survey of directors of Mechanical engineering enterprises in case of monitoring of conditions for development Mechanical engineering enterprises in local region with public authority participation.
The efficiency of PHP is the most important factor when programming for multi-user environments such as information systems for socio-economic research.
Complexity of decision making includes the fact that the Mechanical engineering branch is one of the most industrial productions affecting on other industrial and economic activities and reflects on scientific and technology state, and defense capacity of the state.
It includes given below factors: production constructing, automation of production process, life-time management of production, accounting system and planning of economic financial processes.
For instance, local information systems can be used for solution of conflict of interest in distribution network; survey of medicine experts regarding improvement of consumer properties of equipment for “beauty industry”; local anonymous survey of directors of Mechanical engineering enterprises in case of monitoring of conditions for development Mechanical engineering enterprises in local region with public authority participation.
The efficiency of PHP is the most important factor when programming for multi-user environments such as information systems for socio-economic research.
Online since: September 2013
Authors: Jie Yin, Yong Hong Miao
It has been well accepted that the structure is formed during their depositional and the post depositional processes, where complicated impacts such as mechanical, chemical and biological factors are brought into action [1].
Basic physical properties of the test soil were obtained based on the conventional laboratory tests, as shown in Table 1.
According to soil properties in the Table 1, test soil is classified as silty clay.
For undisturbed silty clay, the effect of soil structure is undoubtedly the main factor affecting the undrained shear strength behavior.
The changing in water content and strength with confining stress for undisturbed sample in the post-yield stress state behave like as a reconstituted sample at given initial water content, which imply that water content is a main factor affecting the strength behavior.
Basic physical properties of the test soil were obtained based on the conventional laboratory tests, as shown in Table 1.
According to soil properties in the Table 1, test soil is classified as silty clay.
For undisturbed silty clay, the effect of soil structure is undoubtedly the main factor affecting the undrained shear strength behavior.
The changing in water content and strength with confining stress for undisturbed sample in the post-yield stress state behave like as a reconstituted sample at given initial water content, which imply that water content is a main factor affecting the strength behavior.
Online since: April 2012
Authors: M.C.M. Alvim-Ferraz, F.G. Martins, Maria José Geraldes, S.I.V. Sousa, P.A.F. Rodrigues
Several factors affect the indoor air quality, among which ventilation, human occupancy, cleaning products, equipment and material; they might induce the presence of aerosols (or bioaerosols in the presence of biological components) nitrogen oxides, ozone, carbon monoxide and dioxide, volatile organic compounds, radon and microorganisms.
The mechanical systems of extraction and/or filtration can also be used to control air quality.
Several factors affect indoor air quality, among which are the ventilation, human occupation, cleaning products, existence of polluting materials and equipment, resulting in the presence of aerosols or bioaerosols (when biological components are present), nitrogen oxides (NOx), ozone (O3), carbon monoxide (CO), carbon dioxide (CO2), formaldehyde (CH2O), volatile organic compounds (VOCs), radon and microorganisms.
Thus it can be stated that nanotechnology allows designing and creating new materials with improved physical properties [9,10].
A large number of extremely important factors in the filter development are considered, such as the use of artificial biomaterials at the nano-scale, due to its high antimicrobial activity and the performance/cost balance, compared to those on the market for air filtration systems.
The mechanical systems of extraction and/or filtration can also be used to control air quality.
Several factors affect indoor air quality, among which are the ventilation, human occupation, cleaning products, existence of polluting materials and equipment, resulting in the presence of aerosols or bioaerosols (when biological components are present), nitrogen oxides (NOx), ozone (O3), carbon monoxide (CO), carbon dioxide (CO2), formaldehyde (CH2O), volatile organic compounds (VOCs), radon and microorganisms.
Thus it can be stated that nanotechnology allows designing and creating new materials with improved physical properties [9,10].
A large number of extremely important factors in the filter development are considered, such as the use of artificial biomaterials at the nano-scale, due to its high antimicrobial activity and the performance/cost balance, compared to those on the market for air filtration systems.
Online since: June 2011
Authors: Qing Ping Sun, Yong Jun He
High damping capacity is one of the prominent properties of NiTi shape memory alloy (SMA), having applications in many engineering devices to reduce unwanted vibrations.
We found that, besides the material thermal/mechanical properties and specimen geometry, environmental condition also affects the damping capacity; and the critical strain rate critical for achieving a maximum damping capacity can be changed by varying the environmental condition.
Introduction Shape memory alloys (SMA) have superior shape memory and superelastic properties due to the first order thermo-elastic austenite-to-martensite phase transition [1,2].
Theoretical modeling and quantitative analytic relationship between the hysteresis and the governing factors (such as external applied strain/loading rate, ambient condition and material thermal and mechanical properties) have not been fully developed in literature.
Properties of NiTi shape memory alloys and th values in convective environments [9].
We found that, besides the material thermal/mechanical properties and specimen geometry, environmental condition also affects the damping capacity; and the critical strain rate critical for achieving a maximum damping capacity can be changed by varying the environmental condition.
Introduction Shape memory alloys (SMA) have superior shape memory and superelastic properties due to the first order thermo-elastic austenite-to-martensite phase transition [1,2].
Theoretical modeling and quantitative analytic relationship between the hysteresis and the governing factors (such as external applied strain/loading rate, ambient condition and material thermal and mechanical properties) have not been fully developed in literature.
Properties of NiTi shape memory alloys and th values in convective environments [9].
Online since: August 2022
Authors: Kaustubh Samvatsar, Harsh Dave
Some major factors affecting casting quality are stated in Fig. 1.
The molud-based factors affecting the quality are moisture and permeability of moulding sand.
Factors affecting the casting quality Degassing Degassing of alloys in the molten state is a critical process and is needed to impart freedom from defects.
The presence of gaseous elements greatly affects the properties of materials.
Pai, Investigation on mechanical properties and creep behavior of stir cast AZ91-SiCp composites, Journal of Magnesium and Alloys 3 (2015) 16-22
The molud-based factors affecting the quality are moisture and permeability of moulding sand.
Factors affecting the casting quality Degassing Degassing of alloys in the molten state is a critical process and is needed to impart freedom from defects.
The presence of gaseous elements greatly affects the properties of materials.
Pai, Investigation on mechanical properties and creep behavior of stir cast AZ91-SiCp composites, Journal of Magnesium and Alloys 3 (2015) 16-22
Online since: July 2017
Authors: K. Manisekar, N. Murugan, M. Vignesh Kumar, J. Lakshmipathy, Subburaj Rajesh Kannan
A FSW joint consists of various zones involving different microstructures and mechanical properties.
The chemical composition and the mechanical properties were analyzed to confirm the base metal properties and it is given in the table 1& 2.
Mechanical properties of 5086 & 7075 aluminium alloys.
The noise factor is one of variability that has to be considered and Process parameters such as control factors are also considered.
In a Taguchi based experiment, the noise factors are considered for the variability to occur, and from the results optimal control factors that make the process robust, can be identified.
The chemical composition and the mechanical properties were analyzed to confirm the base metal properties and it is given in the table 1& 2.
Mechanical properties of 5086 & 7075 aluminium alloys.
The noise factor is one of variability that has to be considered and Process parameters such as control factors are also considered.
In a Taguchi based experiment, the noise factors are considered for the variability to occur, and from the results optimal control factors that make the process robust, can be identified.