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Online since: October 2010
Authors: Rui Ma, Hong Lei Sun, Jing Yin
All factors decide that sheet deep drawing way is the best production method.
Finite Element Model The high-speed railway's track template is formed by 3mm thick 08Al , which sketch is shown in Fig. 1 and which material properties are listed in Table 1.
Then input the parameters of material properties.
Table 1 Material properties of 08Al sheet sσ [MPa] bσ [MPa] E [GPa] n K [MPa] ν 00R 45R 90R 217 388 210 0.21 517 0.28 1.86 1.58 2.01 Fig. 1 Sketch of high-speed railway's track template The Simulation of One Time Deep Drawing The blank shape and its rectangular fitting are calculated by BSE (Blank Size Estimate) function of Dynaform.
He: Mechanical Technologist No. 8 (2001), pp. 37-40 (In Chinese) [8] B.
Finite Element Model The high-speed railway's track template is formed by 3mm thick 08Al , which sketch is shown in Fig. 1 and which material properties are listed in Table 1.
Then input the parameters of material properties.
Table 1 Material properties of 08Al sheet sσ [MPa] bσ [MPa] E [GPa] n K [MPa] ν 00R 45R 90R 217 388 210 0.21 517 0.28 1.86 1.58 2.01 Fig. 1 Sketch of high-speed railway's track template The Simulation of One Time Deep Drawing The blank shape and its rectangular fitting are calculated by BSE (Blank Size Estimate) function of Dynaform.
He: Mechanical Technologist No. 8 (2001), pp. 37-40 (In Chinese) [8] B.
Online since: October 2006
Authors: Hernan A. González-Rojas, Milton Coba Salcedo, Joan Vivancos Calvet
The results of research into the thermal phenomenon that occurs during the abrasion process
comprise a highly important element among the factors to be taken into account in the overall study
of the process.
In general terms, the thermal properties of steel, i.e. specific heat capacity (Cp) and thermal conductivity (K) are properties that depend closely on temperature [3].
We introduce and then discuss the non-linear properties of Cp and K.
Thermal Properties Thermal properties K and Cp are functions that depend on temperature.
Figure 4, shows the difference between the temperature fields of a simulation carried out with constant thermal properties in comparison with a simulation using variable properties.
In general terms, the thermal properties of steel, i.e. specific heat capacity (Cp) and thermal conductivity (K) are properties that depend closely on temperature [3].
We introduce and then discuss the non-linear properties of Cp and K.
Thermal Properties Thermal properties K and Cp are functions that depend on temperature.
Figure 4, shows the difference between the temperature fields of a simulation carried out with constant thermal properties in comparison with a simulation using variable properties.
Online since: April 2010
Authors: Faina Muktepavela, R. Zabels
Mechanical properties, microstructure of the Sn-38wt.
In such applications, the electrical, thermal and mechanical properties of the Sn-Pb alloys are essential.
It is obvious, that the value of the IB energy is an integral characteristic of the physical and chemical properties of the certain boundary and, therefore, can affect the development of the accommodation processes during GBS.
The goal of this work is the experimental detection of solid-phase boundaries wetting and clarification of the role of diffusion processes at the boundaries in the mechanical properties of Sn-Pb eutectics.
On the one hand, using low loads the indentation experiments allow determining the mechanical properties in the grain interior (in one certain grain).
In such applications, the electrical, thermal and mechanical properties of the Sn-Pb alloys are essential.
It is obvious, that the value of the IB energy is an integral characteristic of the physical and chemical properties of the certain boundary and, therefore, can affect the development of the accommodation processes during GBS.
The goal of this work is the experimental detection of solid-phase boundaries wetting and clarification of the role of diffusion processes at the boundaries in the mechanical properties of Sn-Pb eutectics.
On the one hand, using low loads the indentation experiments allow determining the mechanical properties in the grain interior (in one certain grain).
Online since: April 2013
Authors: Pavlo Maruschak, Islam Zakiev, Vitaly Mocharsky, Yuriy Nikiforov
The laser shock-wave treatment of materials allows obtaining the preset physical and chemical properties of the surface and is promising for surface hardening of steels with a view to increasing their wear resistance and impact toughness [3,4].
It is known that the properties of materials are determined by their chemical composition and microstructure.
Under the action of the q-switched laser, when the expansion of the appearing plasma is restrained by the transparent condensed medium, the material surface is affected both by the thermal and shock-wave factors of the laser treatment.
-W.Mai Laser shock processing and its effects on microstructure and properties of metal alloys: A review, Int.
Aznakayev, Micro Gamma, The device for the estimation of physico-mechanical properties of materials, Journal of Laboratory Automation 7 (2002) 44-45
It is known that the properties of materials are determined by their chemical composition and microstructure.
Under the action of the q-switched laser, when the expansion of the appearing plasma is restrained by the transparent condensed medium, the material surface is affected both by the thermal and shock-wave factors of the laser treatment.
-W.Mai Laser shock processing and its effects on microstructure and properties of metal alloys: A review, Int.
Aznakayev, Micro Gamma, The device for the estimation of physico-mechanical properties of materials, Journal of Laboratory Automation 7 (2002) 44-45
Online since: April 2014
Authors: Qing Zhong He, Shuai Guo, Peng Duan, Yun Qi Yan, Pu Quan Wang
Through the methods of combining theoretical research and experimental verification,under the premise that meet tube sheet properties and strength of materials and related technical requirements,which reduce test cost and time and shorten manufacturing cycle and the methods have guiding significance for establishment of welding procedure.
Thermo-mechanical coupling computation Thermal physical properties of material.The material used in welding simulation is 20MnMo that is provided by enterprise,of which thermal physical properties include melting point,density,elastic modulus,poisson's ratio,specific heat,linear expansion coefficient,heat conduction coefficient and convection coefficient etc in different temperatures.As shown in table 2.
In the welding process, welding material is gradually filled in weld joint, then the weld joint material does not exist at the start of welding, but generation with welding processes.It is necessary to use element of life and death technique to truly simulate the process.Element life or death means if add or delete material into the model, the relevant element of the model will birth or death.The death element is not deleted from the model, but the element stiffness matrix is multiplied by a small factor, thus death element’s load, mass, damping and other similar properties will become zero.In welding simulation,weld joint element is killed first and will be reactivated gradually as the welding proceeding,which will deliver energy and realize thermo-mechanical coupling process.
Setting Boundary conditions.Surfacing welding thermo-mechanical coupling boundary conditions include boundary conditions of temperature field analysis and stress and strain.
Loading moving heat source.The accuracy of welding simulation affects the distribution of temperature and stress field directly, so in order to load heat flux into birth element correctly,which must combine heat source movement with life and death of weld joint element closely to ensure the completeness and accuracy of thermo-mechanical coupling process[6].The article uses Fortran language to program the path of heat source movement and heat source equation by heat flow density formulation of Gaussian heat source, part programs shown as followed.
Thermo-mechanical coupling computation Thermal physical properties of material.The material used in welding simulation is 20MnMo that is provided by enterprise,of which thermal physical properties include melting point,density,elastic modulus,poisson's ratio,specific heat,linear expansion coefficient,heat conduction coefficient and convection coefficient etc in different temperatures.As shown in table 2.
In the welding process, welding material is gradually filled in weld joint, then the weld joint material does not exist at the start of welding, but generation with welding processes.It is necessary to use element of life and death technique to truly simulate the process.Element life or death means if add or delete material into the model, the relevant element of the model will birth or death.The death element is not deleted from the model, but the element stiffness matrix is multiplied by a small factor, thus death element’s load, mass, damping and other similar properties will become zero.In welding simulation,weld joint element is killed first and will be reactivated gradually as the welding proceeding,which will deliver energy and realize thermo-mechanical coupling process.
Setting Boundary conditions.Surfacing welding thermo-mechanical coupling boundary conditions include boundary conditions of temperature field analysis and stress and strain.
Loading moving heat source.The accuracy of welding simulation affects the distribution of temperature and stress field directly, so in order to load heat flux into birth element correctly,which must combine heat source movement with life and death of weld joint element closely to ensure the completeness and accuracy of thermo-mechanical coupling process[6].The article uses Fortran language to program the path of heat source movement and heat source equation by heat flow density formulation of Gaussian heat source, part programs shown as followed.
Online since: November 2011
Authors: Xing Liu, Bin Liu, Yan Chen, Yu Ting Wu, Wei Wang, Hong Liang, Hong Guang Zhang
Using this way, the thermodynamic parameters should be calculated and the thermodynamic properties of this system with different working fluids should be analyzed.
However, the working fluid of the system will also affect the efficiency of the ORC system, so this paper mainly research which is the fittest working fluid of this ORC system by analyzing the thermodynamic properties with different working fluids.
This soft is the most popular spread and application in the refrigerant properties library.
The factors affecting the saturated temperature in the condenser are listed as follows. (1) The inlet temperature of water is related to the local ambience temperature.
Finally, the saturated temperature of fluid in the condenser is the sum of the mentioned factors, which is 318K.
However, the working fluid of the system will also affect the efficiency of the ORC system, so this paper mainly research which is the fittest working fluid of this ORC system by analyzing the thermodynamic properties with different working fluids.
This soft is the most popular spread and application in the refrigerant properties library.
The factors affecting the saturated temperature in the condenser are listed as follows. (1) The inlet temperature of water is related to the local ambience temperature.
Finally, the saturated temperature of fluid in the condenser is the sum of the mentioned factors, which is 318K.
Online since: June 2011
Authors: Rolf Zenker, Marco Klemm, Anja Buchwalder
They provide the opportunity for a well-directed change of the local structure associated with the surface layer properties, especially when additional alloying elements (e.g.
The mechanical properties (Fig. 2) were examined in relation to the untreated base material (BM) as well as the EB remelting layers (EBR).
With regard to the representative layer properties, the increase achieved by EB remelting is relatively small.
EB remelting decreases k by a factor of 4.5.
Influence of EB surface treatment on layer properties (AlSi35) An EB multi-process technology was developed for surface alloying of Al alloys to improve the layer quality (porosity, crack sensitivity, surface deformation) in connection with lower production efforts (e.g. mechanical finishing).
The mechanical properties (Fig. 2) were examined in relation to the untreated base material (BM) as well as the EB remelting layers (EBR).
With regard to the representative layer properties, the increase achieved by EB remelting is relatively small.
EB remelting decreases k by a factor of 4.5.
Influence of EB surface treatment on layer properties (AlSi35) An EB multi-process technology was developed for surface alloying of Al alloys to improve the layer quality (porosity, crack sensitivity, surface deformation) in connection with lower production efforts (e.g. mechanical finishing).
Online since: March 2012
Authors: Xian Cheng Wang, Xing He, Jing Zhang
According to engine environmental adaptability evaluation, the engine environmental impact factors are determined after studying the environmental impact assessment mechanism.
Table.2 The evaluation weight coefficients of engine combination property the first level evaluation factor weight coefficient the second level evaluation factor weight coefficient engine equipment combination property evaluation A dynamic quality and economical efficiency B1 0.3232 rated power C11 0.5021 maximum torque C12 0.2864 adaptive torque coefficient C13 0.1463 fuel consumption C14 0.0652 combat readiness B2 0.1646 heating time before starting C21 0.4782 heating time before driving C22 0.2915 heating time after driving C23 0.2303 reliability B3 0.4156 durability C31 0.4583 trouble-free performance C32 0.3464 maintenance ability C33 0.1432 shelf characteristic C34 0.0521 maintainability B4 0.0966 - - Engine Environmental adaptability Evaluation in Typical Environment Environmental Conditions of Typical Areas.
The air temperature was very low in Mohe and engine reliability was affected badly.
The engine combat readiness was affected heavily in Mohe and the engine environmental adaptability condition rate was "general".
Engine environmental adaptability on typical environmental conditions of China was evaluated through calculating the factors such as power, economy, combat readiness and reliability which were affected by the environment.
Table.2 The evaluation weight coefficients of engine combination property the first level evaluation factor weight coefficient the second level evaluation factor weight coefficient engine equipment combination property evaluation A dynamic quality and economical efficiency B1 0.3232 rated power C11 0.5021 maximum torque C12 0.2864 adaptive torque coefficient C13 0.1463 fuel consumption C14 0.0652 combat readiness B2 0.1646 heating time before starting C21 0.4782 heating time before driving C22 0.2915 heating time after driving C23 0.2303 reliability B3 0.4156 durability C31 0.4583 trouble-free performance C32 0.3464 maintenance ability C33 0.1432 shelf characteristic C34 0.0521 maintainability B4 0.0966 - - Engine Environmental adaptability Evaluation in Typical Environment Environmental Conditions of Typical Areas.
The air temperature was very low in Mohe and engine reliability was affected badly.
The engine combat readiness was affected heavily in Mohe and the engine environmental adaptability condition rate was "general".
Engine environmental adaptability on typical environmental conditions of China was evaluated through calculating the factors such as power, economy, combat readiness and reliability which were affected by the environment.
Online since: February 2015
Authors: Hong Shao, Yue Shao, Xiang Long Liu, Yun Jiao Li
The functional properties of peanut protein were enhanced remarkably by ultrasonic waves.
The research of the functional properties of peanut protein products [J].
The research of preparation and its functional properties of the mung bean isolated protein [J].
The functional properties and the exploitation and the application of the soybean isolated protein [J].
The functional properties of the soybean isolated protein and its application in the food industry [J].
The research of the functional properties of peanut protein products [J].
The research of preparation and its functional properties of the mung bean isolated protein [J].
The functional properties and the exploitation and the application of the soybean isolated protein [J].
The functional properties of the soybean isolated protein and its application in the food industry [J].
Online since: January 2014
Authors: Jia Han Bao, Yong Wang, Jie Cai
Fig.3 shows that the temperature of same position in the radial direction of roller sleeve is not the same, which attributed to uneven heating of roller sleeve in the furnace and other factors.
Fig.1 The assembly diagram of grinding roller Fig.2 Temperature test point 1—grinding roller 2—roller sleeve 3—ground 4—interference fit surface 5—shaft shoulder 3 Finite Element Model Creating the finite element model (1/24) of the grinding roller according to the symmetry in order to reduce the scale of calculation and ignoring the influence of random factors, which ignores the part of far away from the thermal assembly and the lifting screw hole.
The material properties are obtained by the Mechanical Design Handbook (Table.1).
Table.1 Material properties Properties Material Elastic modulus (Pa) Poisson's ratio Density (kg/m3) Linear expansion () Friction coefficient Thermal conductivity (W∙m-1∙k-1) Specific heat capacity (J∙kg-1∙k-1) 34CrMoNiV 2.1×1011 0.286 7.9×103 12.5×10-6 0.15 44 460 35 2.0×1011 0.3 7.8×103 11.8×10-6 0.15 48 450 4 Define boundary conditions The way of heat transfer between the inner surface of the roller sleeve and outer surface of the shaft is thermal conduction, as thermal convection and thermal radiation between the grinding roller and air.
While the main factor affects the contact thermal conductivity is the interfacial contact pressure.
Fig.1 The assembly diagram of grinding roller Fig.2 Temperature test point 1—grinding roller 2—roller sleeve 3—ground 4—interference fit surface 5—shaft shoulder 3 Finite Element Model Creating the finite element model (1/24) of the grinding roller according to the symmetry in order to reduce the scale of calculation and ignoring the influence of random factors, which ignores the part of far away from the thermal assembly and the lifting screw hole.
The material properties are obtained by the Mechanical Design Handbook (Table.1).
Table.1 Material properties Properties Material Elastic modulus (Pa) Poisson's ratio Density (kg/m3) Linear expansion () Friction coefficient Thermal conductivity (W∙m-1∙k-1) Specific heat capacity (J∙kg-1∙k-1) 34CrMoNiV 2.1×1011 0.286 7.9×103 12.5×10-6 0.15 44 460 35 2.0×1011 0.3 7.8×103 11.8×10-6 0.15 48 450 4 Define boundary conditions The way of heat transfer between the inner surface of the roller sleeve and outer surface of the shaft is thermal conduction, as thermal convection and thermal radiation between the grinding roller and air.
While the main factor affects the contact thermal conductivity is the interfacial contact pressure.