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Online since: July 2014
Authors: Jia Ying Zhang, Gang Zhao, Ye Wang Sun, Jun Wei Yang, Huai Bin Yang
Finite-element Analysis of a Measuring Model for FeAlCrBSiNb Coating Bonding Strength of Revolution Body
Jiaying Zhang1,a,Gang Zhao2,b, Yewang Sun1,3,c, Junwei Yang2, Huaibin Yang2
1National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, NO.21 Dujiakan, Fengtai district, Beijing 100072, China
2Department of Remanufacturing Engineering, Academy of Armored Force Engineering, NO.21 Dujiakan, Fengtai district, Beijing 100072, China
3School of Mechanical Engineering, Beijing Institute of Technology, No.5 Main South Street, Zhongguancun, Haidian district, Beijing 100081, China
ass411rr@sina.com, bzhaogangpd@163.com, csun_yewang@163.com,
Keywords: Revolution body coating, finite element analysis, stress distribution, bonding strength
Abstract.
In the machining process, force, vibration and other factors affected the bonding strength of coating.
Table 1 showed the properties of materials.
In the analysis process, the thickness of coating was assumed to be uniform, the bonding strength values of all points of the interface were equal, the material properties were isotropic [5], and stress changing that generated in the counterparts bonding process was ignored.
Table.1 Finite-element analysis setup of material properties Property Elastic ratio E/ GPa Poisson ratio v FeAlCrBSiNb 215 0.25 45 210 0.269 According to the characteristic of the sample, half of the 2D axial symmetry finite-element model was used to calculate the stress distribution.
In the machining process, force, vibration and other factors affected the bonding strength of coating.
Table 1 showed the properties of materials.
In the analysis process, the thickness of coating was assumed to be uniform, the bonding strength values of all points of the interface were equal, the material properties were isotropic [5], and stress changing that generated in the counterparts bonding process was ignored.
Table.1 Finite-element analysis setup of material properties Property Elastic ratio E/ GPa Poisson ratio v FeAlCrBSiNb 215 0.25 45 210 0.269 According to the characteristic of the sample, half of the 2D axial symmetry finite-element model was used to calculate the stress distribution.
Online since: October 2010
Authors: Ju Fang Chen, Xing Cheng Li, Ren Xing Li, Lai Di Shen
Despite
the attractive range of bulk mechanical properties, a relatively poor resistance to wear and corrosion is
a serious impediment against wider application of magnesium alloys.
In addition, because of the poor wear properties of magnesium alloys, their application is limited to the static component field [4].
Wear and corrosion are essentially surface related degradation mechanisms that may be reduced or minimized by appropriate tailoring of the surface microstructure without affecting the bulk [5].
To improve the surface properties, a variety of surface modification technologies have been proposed and investigated.
[6] have studied magnesium alloys surface cladding by CO2 laser with an aim to enhance the anti-corrosion and wear resistance, and they concluded that these properties were improved.
In addition, because of the poor wear properties of magnesium alloys, their application is limited to the static component field [4].
Wear and corrosion are essentially surface related degradation mechanisms that may be reduced or minimized by appropriate tailoring of the surface microstructure without affecting the bulk [5].
To improve the surface properties, a variety of surface modification technologies have been proposed and investigated.
[6] have studied magnesium alloys surface cladding by CO2 laser with an aim to enhance the anti-corrosion and wear resistance, and they concluded that these properties were improved.
Online since: August 2013
Authors: Ju Wang, Hui Xin Dai, Lan Luo
Impurities can change the chemical and physical properties of cassiterite, affect the permeability, plankton and other optional feature.
Shaking table includes two basic process loose move layering and zoning, ore particle stratification and pulp of agglomeration and dispersion properties.
The major factors affecting the conversion rate with the reaction rate of the solid material is calcined at the calcinations temperature, the particle size of the solid material, the nature of the outer surface of the solid particles, the ratio of materials, and each of the reaction components in the gas phase partial pressure, etc.
It has trapezoid double tank and dynamic drive form, cam lever type mechanical transmission mechanism.
[2]Zeqiang Zhang, Surface electrical properties for research on the effects of slime gravity separation [J], Non-ferrous metals, 1987 (5) [3]Zhongxiu Yang Spiral chute sorting practice[J], Non-ferrous metals, 1981 (1)
Shaking table includes two basic process loose move layering and zoning, ore particle stratification and pulp of agglomeration and dispersion properties.
The major factors affecting the conversion rate with the reaction rate of the solid material is calcined at the calcinations temperature, the particle size of the solid material, the nature of the outer surface of the solid particles, the ratio of materials, and each of the reaction components in the gas phase partial pressure, etc.
It has trapezoid double tank and dynamic drive form, cam lever type mechanical transmission mechanism.
[2]Zeqiang Zhang, Surface electrical properties for research on the effects of slime gravity separation [J], Non-ferrous metals, 1987 (5) [3]Zhongxiu Yang Spiral chute sorting practice[J], Non-ferrous metals, 1981 (1)
Online since: July 2014
Authors: Lai Wang, Yang Ma
A finite element method was developed to investigate the semi-rigid connection mechanical behaviors in the process of CFST structures progressive collapse, and different semi-rigid connection joint stiffness were taken into consideration and compared to rigid connection.
Introduction Progressive collapse means a disproportionate partial or whole scale structural collapse which triggered by a partial structural damage, progressive collapse may lead to a terribly casualties, it makes a potential threaten to personal and property safety.
Compare four different stiffness connection and use the fixity factor r to measure connection stiffness.
Additionally, corner column shares less restrains than side and inner column, as shown in Fig. 6, beam end moment was affected remarkably with the change of fixity factor.
Fig. 9 shows the relationship curves of vertical displacement of joints v.s. fixity factor and column removal scenario.
Introduction Progressive collapse means a disproportionate partial or whole scale structural collapse which triggered by a partial structural damage, progressive collapse may lead to a terribly casualties, it makes a potential threaten to personal and property safety.
Compare four different stiffness connection and use the fixity factor r to measure connection stiffness.
Additionally, corner column shares less restrains than side and inner column, as shown in Fig. 6, beam end moment was affected remarkably with the change of fixity factor.
Fig. 9 shows the relationship curves of vertical displacement of joints v.s. fixity factor and column removal scenario.
Online since: January 2016
Authors: Banjuraizah Johar, Lim Yi Xuan, Zainal Arifin Ahmad
Glass ceramics are materials with special optical properties such as light reflecting and transmitting.
The outstanding properties of glass ceramic are the most interesting part to be explored.
Besides these factors, the glaze colour is also affected by size and quantity of crystals formed [13].
Demirkıran, The effects of mechanical activation on the sintering and microstructural properties of cordierite produced from natural zeolite, Powder Technol. 260 (2014) 7–14
Chen, Effect of ZrO(2) additions on the crystallization, mechanical and biological properties of MgO-CaO-SiO(2)-P(2)O(5)-CaF(2) bioactive glass-ceramics., Colloids Surf.
The outstanding properties of glass ceramic are the most interesting part to be explored.
Besides these factors, the glaze colour is also affected by size and quantity of crystals formed [13].
Demirkıran, The effects of mechanical activation on the sintering and microstructural properties of cordierite produced from natural zeolite, Powder Technol. 260 (2014) 7–14
Chen, Effect of ZrO(2) additions on the crystallization, mechanical and biological properties of MgO-CaO-SiO(2)-P(2)O(5)-CaF(2) bioactive glass-ceramics., Colloids Surf.
Experimental Testing of an Analytical Model for Membrane Strains in Single Point Incremental Forming
Online since: March 2015
Authors: Matthew Doolan, Tegan McAnulty, David Adams
The model is found to accurately predict minor strains during multi-pass forming, while over-predicting major strains, likely due to material property and friction affects unaccounted for in the model.
This is consistent with Bambach’s identified limitations of material properties and the influence of friction [3].
This is consistent with the limitations identified in Bambach’s model and shows the influence of material properties and friction effects.
The combination of modes of material displacement in all of these degrees of freedom is therefore a function of the material properties, the part geometry and the friction conditions, consistent with the limitations identified by Bambach [3].
Deviations from the experimental results occurred corresponding to the region of line contact, indicating that the deformation in this region may be affected by other factors such as part shape or material properties.
This is consistent with Bambach’s identified limitations of material properties and the influence of friction [3].
This is consistent with the limitations identified in Bambach’s model and shows the influence of material properties and friction effects.
The combination of modes of material displacement in all of these degrees of freedom is therefore a function of the material properties, the part geometry and the friction conditions, consistent with the limitations identified by Bambach [3].
Deviations from the experimental results occurred corresponding to the region of line contact, indicating that the deformation in this region may be affected by other factors such as part shape or material properties.
Online since: May 2019
Authors: Zoran Odanović, Dejan Momčilović
Disassembled turbine shaft with runner, a) Transition (fillet) zone with cracks b)
As a result of the failure analysis [3] the following conclusions emerges that shaft failure occurred due to the combination of several factors:
- Inappropriate corrosion protection in the zone of critical radius and lack of procedures of renewing corrosion protection of turbine shaft
The chemical composition of base material, 20GSL (20Mn5) steel casting, is shown in table 1 and mechanical properties in table 2.
The significance of welding simulation is emphasized by obtaining real values of mechanical properties in heat affected zone.
Mechanical properties of simulated specimens* ΔT8/5 (sec) Impact toughness (J) Hardness, HV, max value 5 8,1 347 10 11,5 295 45 47,5 122 *Average values of 10 simulated specimens The result of dilatometric studies done on weld cycle simulator on the steel specimen is shown in Fig. 9 The results of weldability testing and welding cycle simulation does not directly encourage repair by welding as option.
The choice of repair strategy and feasibility analysis have many influential factors and may not be the same even for the same type of power transmission – in this case study the hydro turbine shafts.
The chemical composition of base material, 20GSL (20Mn5) steel casting, is shown in table 1 and mechanical properties in table 2.
The significance of welding simulation is emphasized by obtaining real values of mechanical properties in heat affected zone.
Mechanical properties of simulated specimens* ΔT8/5 (sec) Impact toughness (J) Hardness, HV, max value 5 8,1 347 10 11,5 295 45 47,5 122 *Average values of 10 simulated specimens The result of dilatometric studies done on weld cycle simulator on the steel specimen is shown in Fig. 9 The results of weldability testing and welding cycle simulation does not directly encourage repair by welding as option.
The choice of repair strategy and feasibility analysis have many influential factors and may not be the same even for the same type of power transmission – in this case study the hydro turbine shafts.
Online since: April 2016
Authors: Nirmal Kumar Mandal, Tanmoy Roy
The temperature rise affects the work material properties, as even moderate temperature rise induces residual stress in the machined surface.
Temperature rise on the relief face of the tool affect the surface finish and metallurgical state of the machined surface.
The purpose of developing mathematical models relating the machining response and their factors is to facilitate the optimization of machining processes.
In the present study, these are selected as design factors while the others parameters are assumed as constant over the experimental domain.
For a given no. of variable, the 𝛼 is required to achieve rotatability, computed as α=nf14,where, nf is the no of points in the 2k factorial design(k is the no. of factors).
Temperature rise on the relief face of the tool affect the surface finish and metallurgical state of the machined surface.
The purpose of developing mathematical models relating the machining response and their factors is to facilitate the optimization of machining processes.
In the present study, these are selected as design factors while the others parameters are assumed as constant over the experimental domain.
For a given no. of variable, the 𝛼 is required to achieve rotatability, computed as α=nf14,where, nf is the no of points in the 2k factorial design(k is the no. of factors).
Online since: December 2023
Authors: Chang Jiu Li, Mahrukh Mahrukh, Li Zhang, Sen Hui Liu
In Atmospheric Plasma Spraying (APS), it is important to understand the controlling factors dominating molten metal droplets’ reaction dynamics to control final coating compositions and properties.
The temperature and velocity variations within the droplet would influence the thermo-physical properties of the droplet and the plasma gas and it controls the onset of the internal circulations within the droplets.
During the APS process, in-flight particles’ evaporation and oxidation decrease the deposition efficiency and significantly affect the microstructure and properties of the coatings.
The Reynolds number is calculated based on the plasma gas velocity and plasma gas’ temperature-dependent properties.
These initial values with the temperature-dependent material properties of the droplets, including the specific heat capacity, specific enthalpy, specific entropy, density, surface tension, and viscosity, were used in the solver and the user-defined function to numerically simulate the droplet dynamics.
The temperature and velocity variations within the droplet would influence the thermo-physical properties of the droplet and the plasma gas and it controls the onset of the internal circulations within the droplets.
During the APS process, in-flight particles’ evaporation and oxidation decrease the deposition efficiency and significantly affect the microstructure and properties of the coatings.
The Reynolds number is calculated based on the plasma gas velocity and plasma gas’ temperature-dependent properties.
These initial values with the temperature-dependent material properties of the droplets, including the specific heat capacity, specific enthalpy, specific entropy, density, surface tension, and viscosity, were used in the solver and the user-defined function to numerically simulate the droplet dynamics.