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Online since: December 2011
Authors: Richard Bateman, Xi Zhi Sun, Saiful Che Ghani, Kai Cheng
In this study three variables, i.e. the space between channel and internal wall of the insert, channel diameter and fluid temperature, have been tested with design of experiments (DoE) to study the significance of the factors and interactions between them on cutting temperature.
A 3-D finite element (FE) model has been developed to observe the effects of these factors on heat transfer rate.
The simulation results show the most dominant factor to affect the cutting temperature is the temperature of the cooling fluid followed by the space between channel and tool insert internal wall.
(5) The thermo-physical properties of the tool are constant through-out the machining process
International Journal of Mechanical Sciences, 43(1), 2001, pp. 57-88
A 3-D finite element (FE) model has been developed to observe the effects of these factors on heat transfer rate.
The simulation results show the most dominant factor to affect the cutting temperature is the temperature of the cooling fluid followed by the space between channel and tool insert internal wall.
(5) The thermo-physical properties of the tool are constant through-out the machining process
International Journal of Mechanical Sciences, 43(1), 2001, pp. 57-88
Online since: October 2006
Authors: Vladimir S. Melnikov, Sergey N. Dub, Gunter Fuchs, Oleg Rozenberg, Tatiana Prikhna, Wolfgang Gawalek, Yaroslav Savchuk, Nina Sergienko, Viktor Moshchil, Vladimir Sverdun, Leo Kovalev, Vladimir Penkin, Matthias Zeisberger, Michael Wendt, Chris Grovenor, Sarah Haigh, Peter Nagorny
The results of the studies of structure, critical
current density, trapped field and mechanical characteristics are discussed.
Recently (in 2001) the superconductive properties of MgB2 were examined.
The Vickers microhardness was estimated using a 1.96 N load and can give a notion of mechanical properties of the material as a whole.
The correlation between the amount of Mg-B (MgB2) inclusions and increase of jc is not so strict because several factors affect the jc.
The Ti addition slightly reduces the material microhardness, while Ta addition increases mechanical properties.
Recently (in 2001) the superconductive properties of MgB2 were examined.
The Vickers microhardness was estimated using a 1.96 N load and can give a notion of mechanical properties of the material as a whole.
The correlation between the amount of Mg-B (MgB2) inclusions and increase of jc is not so strict because several factors affect the jc.
The Ti addition slightly reduces the material microhardness, while Ta addition increases mechanical properties.
Online since: May 2013
Authors: Yu Jun Cai, Qiang Yu, Beyene Gezae Mebrahtu
Study on the Formability Rules with Precise Die Face for the Inner Clutch shell of Automobile
Beyene Gezae Mebrahtu1,a, Cai Yujun2,b, and Yu Qiang3,c
1,2,3 Tianjin University of technology and education, School of Mechanical engineering, Tianjin, China
agezae2020@gmail.com, bcyjal@126.com, cyuqiang95@yeah.net
Keywords: Rule of precise, simulation, FEM, Wrinkle, sheet metal forming, die face
Abstract.
Finally compute all simulation results with reference to the original part property and recommend the appropriate process flow to produce the part, the comparison with tryout results shows that the formality simulation of thick panel with precise die face is reliable and accurate.
Table 1- Main parts of the three processes Model for Die Punch Binder Draw 1st Flange 2nd Flange The material chosen for the analysis was Material-Type 36 in DAYNAFORM: QC mild steel which properties are consistent with the real one.
The following picture shows us the whole process flow for inner clutch shell Draw First Trim First flange Second trim Second flange Fig. 4 Process flow Numerical Results Wrinkling is affected by many factors, such as process parameters, contact conditions, mechanical properties and geometry of the blank.
Finally compute all simulation results with reference to the original part property and recommend the appropriate process flow to produce the part, the comparison with tryout results shows that the formality simulation of thick panel with precise die face is reliable and accurate.
Table 1- Main parts of the three processes Model for Die Punch Binder Draw 1st Flange 2nd Flange The material chosen for the analysis was Material-Type 36 in DAYNAFORM: QC mild steel which properties are consistent with the real one.
The following picture shows us the whole process flow for inner clutch shell Draw First Trim First flange Second trim Second flange Fig. 4 Process flow Numerical Results Wrinkling is affected by many factors, such as process parameters, contact conditions, mechanical properties and geometry of the blank.
Online since: January 2020
Authors: Yu.A. Svinoroev, Valery V. Dyadichev, O.A. Ternovskiy
Theory
The low binding capacity and instability of properties are the deterrent factors of using the lignin-containing substances (in particular LST) as binders in the foundry.
Since the binding capacity of the material is determined by the strength of the standard of "eight samples", then to understand the possible ways of its increase it is necessary to conduct a complete analysis of the factors, that can affect this indicator at all stages of the process.
While specifying the purpose in a part of regarding changes of LST properties, it is necessary to focus attention on the importance of methods of modification.
This representation of the mechanism of structure formation of LST leads to the understanding, that the activities carried out to stabilize the properties of LST will affect the improvement of their binding capacity, which, in turn, theoretically creates the prerequisites for expanding the application of LST in casting processes.
Spassky, Rising of the properties of mixtures by chemical activation of lignosulfonates: Foundry, 7 (1978) 19-21
Since the binding capacity of the material is determined by the strength of the standard of "eight samples", then to understand the possible ways of its increase it is necessary to conduct a complete analysis of the factors, that can affect this indicator at all stages of the process.
While specifying the purpose in a part of regarding changes of LST properties, it is necessary to focus attention on the importance of methods of modification.
This representation of the mechanism of structure formation of LST leads to the understanding, that the activities carried out to stabilize the properties of LST will affect the improvement of their binding capacity, which, in turn, theoretically creates the prerequisites for expanding the application of LST in casting processes.
Spassky, Rising of the properties of mixtures by chemical activation of lignosulfonates: Foundry, 7 (1978) 19-21
Online since: November 2019
Authors: M. Naik Gajanan, B.N. Anjan, B. Sachin, Roy Abhinaba, N.P. Puneet, Vinayak N. Kulkarni, C.J. Vishwas
Aluminum-based metal matrix composites (MMCs) have been suggested due to intense interest from automobile, marine, aerospace and other structural applications owing to their balanced mechanical, physical and chemical properties.
MMCs have very good corrosion resistance properties along with good specific strength.
For instance, few studies have reported an improvement in the tribological properties of the material under various cooling agents [2-5].
A comprehensive study was conducted by Vishwas et al. [11] on the surface integrity properties of AISI 410 martensitic stainless steel.
Taguchi's L9 orthogonal array with three factors and three levels are used for the present experimental study as shown in Table 2 and Table 3.
MMCs have very good corrosion resistance properties along with good specific strength.
For instance, few studies have reported an improvement in the tribological properties of the material under various cooling agents [2-5].
A comprehensive study was conducted by Vishwas et al. [11] on the surface integrity properties of AISI 410 martensitic stainless steel.
Taguchi's L9 orthogonal array with three factors and three levels are used for the present experimental study as shown in Table 2 and Table 3.
Online since: July 2023
Authors: Adhitasari Suratman, Dwi Siswanta, Farida Ariani
In the optimization of preconcentration parameters, the optimal adsorption, desorption, and enrichment factors were obtained at pH 4, the adsorbent mass of 90 mg, adsorption time of 95 min, Cu(II) concentrations of 7 mgL-1, and Na2EDTA 1 M.
However, chitosan is unstable in acidic media, with low thermal stability and mechanical strength.
Therefore, modifications are required to increase the adsorption capacity and mechanical properties [11,12].
Meanwhile, at a pH higher than the optimum pH, the value of adsorption, desorption, and enrichment factors decreased due to the competition between OH– ions with –NH and –OH groups in CS-DCMC to bind with Cu(II) ions.
The concentration of Na2EDTA significantly affects the percentage of desorption.
However, chitosan is unstable in acidic media, with low thermal stability and mechanical strength.
Therefore, modifications are required to increase the adsorption capacity and mechanical properties [11,12].
Meanwhile, at a pH higher than the optimum pH, the value of adsorption, desorption, and enrichment factors decreased due to the competition between OH– ions with –NH and –OH groups in CS-DCMC to bind with Cu(II) ions.
The concentration of Na2EDTA significantly affects the percentage of desorption.
Online since: July 2022
Authors: Victoria Shvetsova, Vadim Soloviev
Materials and Methods
The influence of calcium stearate on the technological properties of the cement-sand mixture, on the strength characteristics, capillary water absorption, and water absorption kinetics was investigated.
Results The technological properties of the concrete mixture were investigated: density, air entrainment, mobility. 3.1.
Conclusion The main goal of this work was to compare the effects of powdered CS and CS in the form of a suspension on the technological properties of the concrete mixture and the physical and mechanical properties of fine-grained concrete.
[6] Maryoto A., Gan B.S., Hermanto N.I.S., Setijadi R: Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders.
Influence of freeze-thaw cycles on properties of Integral Water Repellent Concrete.
Results The technological properties of the concrete mixture were investigated: density, air entrainment, mobility. 3.1.
Conclusion The main goal of this work was to compare the effects of powdered CS and CS in the form of a suspension on the technological properties of the concrete mixture and the physical and mechanical properties of fine-grained concrete.
[6] Maryoto A., Gan B.S., Hermanto N.I.S., Setijadi R: Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders.
Influence of freeze-thaw cycles on properties of Integral Water Repellent Concrete.
Online since: November 2014
Authors: Kamaruzzaman Sopian, Suhaimi Misha, Elias Salleh, Sohif Mat, Mohamad Afzanizam Bin Mohd Rosli, Mohd Yusof Sulaiman
Various factors affect PVT performance.
One of the most crucial factors is the absorber collector.
Aside from design features, such as tube diameter and the gap between tubes, PVT depends on the material properties and thickness of the absorber collector [4].
Table 2 shows the fin efficiency, collector efficiency, heat removal factor, overall losses, and transmittance absorbance.
Outlet temperatures of PVT system Mass flow rate Outlet temperature Mass flow rate Outlet temperature gpm kg/s °C gpm kg/s °C 4.00 0.2524 41.1 0.25 0.0157 55.0 2.00 0.1261 42.2 0.10 0.0063 69.8 1.00 0.0630 44.2 Conclusions Collector dimensions and material properties crucially affect the measurement of PVT performance.
One of the most crucial factors is the absorber collector.
Aside from design features, such as tube diameter and the gap between tubes, PVT depends on the material properties and thickness of the absorber collector [4].
Table 2 shows the fin efficiency, collector efficiency, heat removal factor, overall losses, and transmittance absorbance.
Outlet temperatures of PVT system Mass flow rate Outlet temperature Mass flow rate Outlet temperature gpm kg/s °C gpm kg/s °C 4.00 0.2524 41.1 0.25 0.0157 55.0 2.00 0.1261 42.2 0.10 0.0063 69.8 1.00 0.0630 44.2 Conclusions Collector dimensions and material properties crucially affect the measurement of PVT performance.
Online since: July 2014
Authors: Rui Huang, Yu Yun Li, Yi Peng Fan, Jun Zhou Yang
Air conditioning water system uses a double control mechanical circulation pump variable flow system (A power frequency, two sets of variable frequency).
Table5 The measured and simulated air conditioning heating energy consumption Air-conditioning energy consumption/kWh Heating energy consumption/kWh Air-conditioning and heating/kWh Measured 144165 100872 245037 Simulated 148329 100623 248952 Results analysis What causes the differences between the energy consumption of building’s simulated and measured data in many factors,including environmental factors, operation mode and operation management, etc
(1) Environmental factors .Environmental factors is the difference of weather data, due to the energy consumption simulation is the typical year weather data used meteorological data(Typical meteorological year is on the basis of the monthly average data from nearly a decade of months a year average of nearly 10 years as a typical meteorological year.
When analyzing long-term monitoring data, find some floors of the instrument have been damaged and it cannot properly record data, these floors can only get a load based on the weighted average of the other floors of the load, the factors that may cause the data deviation between simulation and measurement.
Green Building Evaluation Standard GB50378-2006.Beijing: China Building Industry Press, 2006 [2] Ministry of Construction.Building exterior doors airtight, watertight, wind pressure properties and test methods GB 7108-2008.Beijing: China Building Industry Press, 2008 [3] Ministry of Construction.Public building energy efficiency design standards GB50189-2005.
Table5 The measured and simulated air conditioning heating energy consumption Air-conditioning energy consumption/kWh Heating energy consumption/kWh Air-conditioning and heating/kWh Measured 144165 100872 245037 Simulated 148329 100623 248952 Results analysis What causes the differences between the energy consumption of building’s simulated and measured data in many factors,including environmental factors, operation mode and operation management, etc
(1) Environmental factors .Environmental factors is the difference of weather data, due to the energy consumption simulation is the typical year weather data used meteorological data(Typical meteorological year is on the basis of the monthly average data from nearly a decade of months a year average of nearly 10 years as a typical meteorological year.
When analyzing long-term monitoring data, find some floors of the instrument have been damaged and it cannot properly record data, these floors can only get a load based on the weighted average of the other floors of the load, the factors that may cause the data deviation between simulation and measurement.
Green Building Evaluation Standard GB50378-2006.Beijing: China Building Industry Press, 2006 [2] Ministry of Construction.Building exterior doors airtight, watertight, wind pressure properties and test methods GB 7108-2008.Beijing: China Building Industry Press, 2008 [3] Ministry of Construction.Public building energy efficiency design standards GB50189-2005.
Online since: December 2014
Authors: Shu Fang, Jian Qiao Fu, Yan Xu
A reasonable structure and safety factor should be considered[3][4].
The material properties are as follow: Yield strength: 2.82685e+008 N/m^2, Tensile strength: 5.85e+008 N/m^2, Elastic modulus: 2.05e+011 N/m^2, Poisson ratio: 0.29, Mass density: 7850 kg/m^3, Shear modulus: 8e+010 N/m^2, Thermal expansion coefficient: 1.1e-005 /Kelvin.
The deformation of the component is extremely small, and do not affect the normal run of the robot. 3.
Reliability sensitivity analysis on influence of vertical force to mechanical property of lower cross arm suspension[J].
Lateral Mechanical Analysis and Stress Surveying of Piston Rod for Vehicle Strut Shock Absorber[J].
The material properties are as follow: Yield strength: 2.82685e+008 N/m^2, Tensile strength: 5.85e+008 N/m^2, Elastic modulus: 2.05e+011 N/m^2, Poisson ratio: 0.29, Mass density: 7850 kg/m^3, Shear modulus: 8e+010 N/m^2, Thermal expansion coefficient: 1.1e-005 /Kelvin.
The deformation of the component is extremely small, and do not affect the normal run of the robot. 3.
Reliability sensitivity analysis on influence of vertical force to mechanical property of lower cross arm suspension[J].
Lateral Mechanical Analysis and Stress Surveying of Piston Rod for Vehicle Strut Shock Absorber[J].