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Online since: March 2013
Authors: Gui Lin Wang, Ke Jie Wen, Fan Yang
These characteristics have become important factors which will restrict the FTS system’s processing capacity and processing accuracy.
In order to reduce load of high-frequency movement, and to improve dynamic performance, moving parts of this tool holder adopts hollow structure, whose structure is optimized for ensuring its stiffness not to be affected. 2.2 Technique system modeling The operating principle of mechanical parts and circuit part of FTS system is shown in Figure1(b).
The mechanical part is a typical spring-mass-damper system, whose transfer function Gm(s) is shown as follows: (1) where,K'=kp/(kp+k),,.
It can be obtained that 1) Amplitude attenuation and phase angle offset increase with input signal increasing. 2) In the state of low-frequency, FTS system’s displacement attenuation is similar to mechanical system’s displacement attenuation.
Design of diamond-turned holograms incorporating properties of the fabrication process.
In order to reduce load of high-frequency movement, and to improve dynamic performance, moving parts of this tool holder adopts hollow structure, whose structure is optimized for ensuring its stiffness not to be affected. 2.2 Technique system modeling The operating principle of mechanical parts and circuit part of FTS system is shown in Figure1(b).
The mechanical part is a typical spring-mass-damper system, whose transfer function Gm(s) is shown as follows: (1) where,K'=kp/(kp+k),,.
It can be obtained that 1) Amplitude attenuation and phase angle offset increase with input signal increasing. 2) In the state of low-frequency, FTS system’s displacement attenuation is similar to mechanical system’s displacement attenuation.
Design of diamond-turned holograms incorporating properties of the fabrication process.
Online since: March 2019
Authors: Fu Zhen Xuan, Shan Tung Tu, Shu Xian Lin, Yu Hui Huang
As we know, stress corrosion cracking is related to three factors: materials, corrosion environment and load.
In terms of materials, it mainly refers to chemical composition, heat treatment process, mechanical properties and microstructure of the steel and so on [4].
The stress-strain curves are shown in Fig. 4 and the mechanical properties are presented in Table 2.
Fig. 4 Stress-strain curves of rotor steels in air and corrosion condition Table 2 Mechanical properties of rotor steels in air and corrosion condition Materials 25°C,air 180°C,3.5wt.
(2) The SCC sensitivities of CrNiMoV steam turbine rotor steels are affected by microstructure and mechanical properties of materials.
In terms of materials, it mainly refers to chemical composition, heat treatment process, mechanical properties and microstructure of the steel and so on [4].
The stress-strain curves are shown in Fig. 4 and the mechanical properties are presented in Table 2.
Fig. 4 Stress-strain curves of rotor steels in air and corrosion condition Table 2 Mechanical properties of rotor steels in air and corrosion condition Materials 25°C,air 180°C,3.5wt.
(2) The SCC sensitivities of CrNiMoV steam turbine rotor steels are affected by microstructure and mechanical properties of materials.
Online since: March 2010
Authors: Dun Wen Zuo, Hong Miao, Hong Feng Wang, Hong Jun Wang
And
the surface property of extruded thread is similar to rolled thread.
But the research material in this paper was the high strength steel, and which had high strength, well transverse plastic property and fracture toughness property.
In cold extrusion technology of internal thread of high strength steel there are many important factors affecting the quality of extruded section such as technological design of cold extrusion and design of technological parameters for the extrusion tap.
This paper choused the length of press section L1, the length of correcting section on the petrous pyramid L2 and cone angle α for the design variables from the many factors affecting extrusion quality of internal thread as showed in Fig.1.
Zhang: Chinese Journal of Mechanical Engineering, 2002, 8(38):45-49
But the research material in this paper was the high strength steel, and which had high strength, well transverse plastic property and fracture toughness property.
In cold extrusion technology of internal thread of high strength steel there are many important factors affecting the quality of extruded section such as technological design of cold extrusion and design of technological parameters for the extrusion tap.
This paper choused the length of press section L1, the length of correcting section on the petrous pyramid L2 and cone angle α for the design variables from the many factors affecting extrusion quality of internal thread as showed in Fig.1.
Zhang: Chinese Journal of Mechanical Engineering, 2002, 8(38):45-49
Online since: April 2014
Authors: An Hui Cai, Xiao Song Li, Ji Jie Zeng
Effect of Fe on the microstructure and the thermal storage performances of high-silicon aluminum alloy
Xiaosong Li 1,a, Anhui Cai 2,b,* and Jijie Zeng 3,c
1,2,3 School of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China,
a songxli89@163.com, b cah1970@sohu.com, c jijiezeng@163.com
* songxli89@163.com
Keywords: Fe, Al-Si alloy; Primary silicon; Expansion coefficient; Thermal conductivity
Abstract.
From the eighty's of the last century the late, domestic scholars such as Zhang Renyuan are on the preparation and properties of metal phase change materials for thermal energy storage system, and have been applied in the field of energy storage [3], heating equipment and household appliances, however, study on the metal phase-change energy storage at home and abroad, are concentrated in the screening, heat the material of the test, or thermal analysis, the energy storage process energy analysis and economic analysis [4], and the phase change material in Al-Si alloy smelting and long-term thermal recycling process caused by environmental factors have a certain amount of Fe addition and the composition and structure of the Research on the impact of the aluminum silicon alloy heat storage properties is still lacking, which for the realization of engineering application for a long time is necessary.
Therefore, the size of the primary silicon phase directly affects the size of the stress, so the smaller primary silicon phase thermal expansion properties of the material are also favorable [8].
And that at lower temperatures, the dislocation is often an important factor affecting energy scattering, the high point defect concentration in the case, thermal resistance caused by point defects and non-harmonic vibration associated.
Acknowledgement This work was financially supported by the Project of Hunan Science and Technology (No.2012JJ3141) and the Key Construction Disciplines of Hunan (Mechanical Manufacturing and Automation).
From the eighty's of the last century the late, domestic scholars such as Zhang Renyuan are on the preparation and properties of metal phase change materials for thermal energy storage system, and have been applied in the field of energy storage [3], heating equipment and household appliances, however, study on the metal phase-change energy storage at home and abroad, are concentrated in the screening, heat the material of the test, or thermal analysis, the energy storage process energy analysis and economic analysis [4], and the phase change material in Al-Si alloy smelting and long-term thermal recycling process caused by environmental factors have a certain amount of Fe addition and the composition and structure of the Research on the impact of the aluminum silicon alloy heat storage properties is still lacking, which for the realization of engineering application for a long time is necessary.
Therefore, the size of the primary silicon phase directly affects the size of the stress, so the smaller primary silicon phase thermal expansion properties of the material are also favorable [8].
And that at lower temperatures, the dislocation is often an important factor affecting energy scattering, the high point defect concentration in the case, thermal resistance caused by point defects and non-harmonic vibration associated.
Acknowledgement This work was financially supported by the Project of Hunan Science and Technology (No.2012JJ3141) and the Key Construction Disciplines of Hunan (Mechanical Manufacturing and Automation).
Online since: September 2024
Authors: Artem Ruban, Viktoriya Pasternak, Oleksandr Zemlianskyi, Gennady Ivanov
Using Smart-EYE software, the microstructure and heterogeneous structure of PA-1 aluminum powders are justified through a range of factors.
Scientific groups [20] mainly describe imaging methods that are sensitive to external factors such as temperature, humidity, or loading, which can complicate obtaining stable and reliable research results.
Additionally, the AFM method can be used to measure the mechanical and physical properties of materials (heterogeneous environments) such as hardness and elasticity.
This connection between macroscopic behavior and microstructure is crucial for understanding and predicting the physical-mechanical properties and parameters of heterogeneous materials.
Chen, Microstructure, mechanical properties and machinability of particulate reinforced Al matrix composites: a comparative study between SiC particles and high-entropy alloy particles, Journal of Materials Research and Technology 9 (2020) 1-19
Scientific groups [20] mainly describe imaging methods that are sensitive to external factors such as temperature, humidity, or loading, which can complicate obtaining stable and reliable research results.
Additionally, the AFM method can be used to measure the mechanical and physical properties of materials (heterogeneous environments) such as hardness and elasticity.
This connection between macroscopic behavior and microstructure is crucial for understanding and predicting the physical-mechanical properties and parameters of heterogeneous materials.
Chen, Microstructure, mechanical properties and machinability of particulate reinforced Al matrix composites: a comparative study between SiC particles and high-entropy alloy particles, Journal of Materials Research and Technology 9 (2020) 1-19
Online since: September 2013
Authors: Chuan Zhen Huang, Peng Yao, Jun Wang, Zeng Wen Liu, Hong Tao Zhu, Zhong Bo Yue
The results show that the feed speed is the most significant variables affecting the depth of turning.
(a)offset mode (b)radial mode Fig .1 Abrasive waterjet turning modes Experimental procedure The experiments were conducted on cylindrical specimens using the specially designed AWJ turning setup and the mechanical properties of the 96% alumina ceramic specimens chosen for the present investigation are shown in Table 1.
Properties of workpiece material (96% alumina ceramics) External diameter: 70[mm] Inner diameter: 40[mm] Vickers hardness: 18~22[GPa] Fracture toughness: 4[MPa·m1/2] Flexural strength: 320[MPa] Density: 3.7 [g/cm3] Elastic modulus: 300[GPa] Table 2.
Experimental Results and Discussion An analysis of range and variance is conducted and the results show that feed speed and water pressure are significant variables affecting the depth of turning, while abrasive mass flow rate, surface speed and nozzle tilted angle also show some effect on the depth of turning, as shown in Table 3.
The feed speed plays an important role in affecting the depth of turning among all the considered variables.
(a)offset mode (b)radial mode Fig .1 Abrasive waterjet turning modes Experimental procedure The experiments were conducted on cylindrical specimens using the specially designed AWJ turning setup and the mechanical properties of the 96% alumina ceramic specimens chosen for the present investigation are shown in Table 1.
Properties of workpiece material (96% alumina ceramics) External diameter: 70[mm] Inner diameter: 40[mm] Vickers hardness: 18~22[GPa] Fracture toughness: 4[MPa·m1/2] Flexural strength: 320[MPa] Density: 3.7 [g/cm3] Elastic modulus: 300[GPa] Table 2.
Experimental Results and Discussion An analysis of range and variance is conducted and the results show that feed speed and water pressure are significant variables affecting the depth of turning, while abrasive mass flow rate, surface speed and nozzle tilted angle also show some effect on the depth of turning, as shown in Table 3.
The feed speed plays an important role in affecting the depth of turning among all the considered variables.
Online since: September 2016
Authors: Zheng Dong Wang, Hong Liang Pan, Jian Jun Chen, Quan Sun, Da Qian Zan
Different reductions were the mainly analysis factor which can study the extent of the edge crack extension by presetting the edge notch.
Introduction The cold rolling steel sheet has excellent flatness and high production efficiency properties, which makes it widely used in the automobile, energy sources and chemical industry.
In the cold rolling process, the stress state is complicated and affected by rolling force, friction, reduction ratio and rolling tension etc.
(b) In-Situ SEM three point bending specimen Fig.3 Experiment fixture (a) thin-plate tensile test fixture, (b) In-Situ SEM three point bending test fixture Determination of the cohesive parameters The material’s mechanical properties were obtained by uniaxial tensile test as: the elasticity modulus E=205 GPa, Poisson’s ratio ν = 0.3, and the engineering tensile strength, Rm = 350 MPa, the yield strength, σy = 278 MPa.
In this experiment, the reduction ratio was analyzed as an important factor which can affect the V-shape notch edge crack extension in one cold rolling process.
Introduction The cold rolling steel sheet has excellent flatness and high production efficiency properties, which makes it widely used in the automobile, energy sources and chemical industry.
In the cold rolling process, the stress state is complicated and affected by rolling force, friction, reduction ratio and rolling tension etc.
(b) In-Situ SEM three point bending specimen Fig.3 Experiment fixture (a) thin-plate tensile test fixture, (b) In-Situ SEM three point bending test fixture Determination of the cohesive parameters The material’s mechanical properties were obtained by uniaxial tensile test as: the elasticity modulus E=205 GPa, Poisson’s ratio ν = 0.3, and the engineering tensile strength, Rm = 350 MPa, the yield strength, σy = 278 MPa.
In this experiment, the reduction ratio was analyzed as an important factor which can affect the V-shape notch edge crack extension in one cold rolling process.
Online since: August 2011
Authors: Wei Ping Yang, Yong Bo Wu, Hong Fei Yang
Q= 0.25L/min, 40 min
v= 8 m/s, 40 min
(a) Integrity factor vs. slurry supplying Q (b) Integrity factor vs. velocity at polishing point v
Fig. 7 Polishing surface integrity factor KR vs. slurry feeder, velocity
At the same time, the wafer surface roughness Ra during polishing obtained under the same polishing conditions were characterized by Surface roughness measuring instrument (Surfcom 480A, Tokyo Seimitsu Co., Ltd.).
Comparing Fig. 9 with Fig. 7 and Fig.8 shows that the process parameters affect the surface morphology just through the pad surface status.
In addition, the chemical reaction occurs in general between the solvent of slurry and the work material during silicon wafer polishing to change the mechanical properties of the wafer surfaces.
(3) it is clear that the high slurry supply generates a surface of poor surface roughness, and larger MRR, but the defect factor introduced to indicate the surface topography is affected significantly by the process parameters; the lowest value of the factor can be obtained on a optimum values
Microelectronic Engineering, Vol. 56(1-2) (2001), p. 109-115 [2] Jianxiu Su, Renke Kang, Dongming Guo: Technology analysis of wafer chemical mechanical polishing in the manufacture of ULSI.
Comparing Fig. 9 with Fig. 7 and Fig.8 shows that the process parameters affect the surface morphology just through the pad surface status.
In addition, the chemical reaction occurs in general between the solvent of slurry and the work material during silicon wafer polishing to change the mechanical properties of the wafer surfaces.
(3) it is clear that the high slurry supply generates a surface of poor surface roughness, and larger MRR, but the defect factor introduced to indicate the surface topography is affected significantly by the process parameters; the lowest value of the factor can be obtained on a optimum values
Microelectronic Engineering, Vol. 56(1-2) (2001), p. 109-115 [2] Jianxiu Su, Renke Kang, Dongming Guo: Technology analysis of wafer chemical mechanical polishing in the manufacture of ULSI.
Online since: April 2018
Authors: Asiya Duryagina, Irina Talovina, Anastasia Shtyrlyaeva, Oleg Popov
The influence of the rock properties on the processing characteristics is a well-established fact [1].
X-Ray Computer Tomography CT is an effective supplement in the complex studies of technological properties of rocks.
It determines the interpretation of the strength properties and behavior of the rock during desintegration [6].
Based on a large amount of data with using of mathematical-statistical modeling (correlation, factor analysis, etc.) it’s possible to predict the relationship between the morphometric rock parameters and properties of the crushing product or system characteristics, such as wear or energy consumption.
Kameneva, Study of physical and mechanical properties of building rock affecting their quality dezintegration and final commercial products, Plaksinskie chtenija, (2013) 7-12
X-Ray Computer Tomography CT is an effective supplement in the complex studies of technological properties of rocks.
It determines the interpretation of the strength properties and behavior of the rock during desintegration [6].
Based on a large amount of data with using of mathematical-statistical modeling (correlation, factor analysis, etc.) it’s possible to predict the relationship between the morphometric rock parameters and properties of the crushing product or system characteristics, such as wear or energy consumption.
Kameneva, Study of physical and mechanical properties of building rock affecting their quality dezintegration and final commercial products, Plaksinskie chtenija, (2013) 7-12
Online since: May 2013
Authors: S.K. Tripathi
Mechanical properties
2.2.3.
Factors that affect Polymer Nanocomposites Structure 4.1.
Other kinds of nanoparticulates may result in enhanced optical properties, dielectric properties or mechanical properties such as stiffness and strength.
Factors Affecting Polymer Nanocomposite Structure · Synthesis method (melt compounding, solvent blending, in-situ polymerization, emulsion polymerization etc)
The synthesis method and the factors affecting their properties have been discussed in detail.
Factors that affect Polymer Nanocomposites Structure 4.1.
Other kinds of nanoparticulates may result in enhanced optical properties, dielectric properties or mechanical properties such as stiffness and strength.
Factors Affecting Polymer Nanocomposite Structure · Synthesis method (melt compounding, solvent blending, in-situ polymerization, emulsion polymerization etc)
The synthesis method and the factors affecting their properties have been discussed in detail.