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Online since: November 2011
Authors: Hai Wang Ye, Kai Wu, Jin Wang
According to the real conditions of Jinduicheng Molybdenum Open-pit Mine and considering slope stability influential factors such as rock properties and geological structures, slope geometry parameters, groundwater, blasting activities and others, a fuzzy synthetic evaluation model of slope stability is established, which involved membership functions and multi-level weight distribution method.
The membership degrees of these factors, which are divided into qualitative factors and quantitative factors, are calculated from trapezoidal membership function and ridge membership function.
Since rock properties of the mine are close, rock mechanical parameters of other sides could be defined referring to the values above [1].
Membership function includes membership function of quantitative influential factors and that of qualitative influential factors.
Fig. 7 Quantitative influential factors Weight of Factors.
The membership degrees of these factors, which are divided into qualitative factors and quantitative factors, are calculated from trapezoidal membership function and ridge membership function.
Since rock properties of the mine are close, rock mechanical parameters of other sides could be defined referring to the values above [1].
Membership function includes membership function of quantitative influential factors and that of qualitative influential factors.
Fig. 7 Quantitative influential factors Weight of Factors.
Online since: September 2013
Authors: Xiang Zhang, Cun Yun Pan, Hai Jun Xu, Lei Zhang, Hu Chen, Ten Gan Zou
The quick optimization of product performance is realized by Design Explorer of ANSYS workbench [5], which mainly help designers identify the impacts of those uncertain factors on the parts before the product designing and using, and also determine how best to improve the reliability of the product.
The Optimization Calculation of Static Strength Of Rod For simplicity, the following assumptions are needed: first, assuming that the whole possession space in rod is filled with matter without any vacant land; second, assuming that the mechanical properties of material has nothing to do with its position in the rod, that is to say the rod is uniform; third, assuming that the mechanical properties of material are the same in all directions, that is to say the rod is isotropic.
For rod length L and width b, they should be selected as bigger range as possible without affecting the normal movement.
[6] Mechanical Editers Group.
Material selected handbook for Mechanical Engineering [M].
The Optimization Calculation of Static Strength Of Rod For simplicity, the following assumptions are needed: first, assuming that the whole possession space in rod is filled with matter without any vacant land; second, assuming that the mechanical properties of material has nothing to do with its position in the rod, that is to say the rod is uniform; third, assuming that the mechanical properties of material are the same in all directions, that is to say the rod is isotropic.
For rod length L and width b, they should be selected as bigger range as possible without affecting the normal movement.
[6] Mechanical Editers Group.
Material selected handbook for Mechanical Engineering [M].
Online since: July 2014
Authors: Ji Gao, De Yang Song, Jun Wen Feng
Microstructure, microhardness and wear properties of the coating are characterized by optional microscope(OM), scan electron microscopy(SEM), X-ray diffraction (XRD) and HV-1000 microhardness tester and the effect of different laser powers(1.2kW, 1.6kW, 2.0kW) on the three factors was studied.
Introduction Titanium alloys are characterized by low density, high specific strength, exceptional corrosion resistance and high temperature mechanical properties which are attractive for a wide range of applications in aerospace, chemical and marine industries etc.[1-3].
Due to the failure of most of the titanium alloy parts often appear in the material surface, so without affecting the original excellent properties of titanium alloy to choose an appropriate surface modification technology can greatly improve the utilization rate of titanium alloy [4-5].
Studies have shown that the influencing factors on the quality of the coating are laser power, laser scanning speed, spot size, defocusing distance and preset thickness, etc.
On this paper, the effect of different laser powers on microstructure, microhardness and wear resistance properties of CBN coating was researched.
Introduction Titanium alloys are characterized by low density, high specific strength, exceptional corrosion resistance and high temperature mechanical properties which are attractive for a wide range of applications in aerospace, chemical and marine industries etc.[1-3].
Due to the failure of most of the titanium alloy parts often appear in the material surface, so without affecting the original excellent properties of titanium alloy to choose an appropriate surface modification technology can greatly improve the utilization rate of titanium alloy [4-5].
Studies have shown that the influencing factors on the quality of the coating are laser power, laser scanning speed, spot size, defocusing distance and preset thickness, etc.
On this paper, the effect of different laser powers on microstructure, microhardness and wear resistance properties of CBN coating was researched.
Online since: May 2020
Authors: Boris Syrnev, Alexander Revutskiy, Oksana Semilutskaya
The research results of electron microscopic studies were the base for demonstrating formation of the hydraulic phase at the grain boundary of sintered beryllium and influence of the reinforcing phase on the mechanical properties of the HIP blank.
It is also known that Beryllium strength properties including the precision elastic limit increase when content of hardening phases increase along grain boundaries, primarily Beryllium oxide [2-5].
However, the strength properties of the blanks depend on both the average grain size and the temperature of isostatic pressing (Figure 3).
Determined graphical and analytical dependences provide the possibility of “fine” control of the Beryllium strength properties by “dosing” the contribution of each element of the “dispersion-grain-boundary” hardening mechanism.
The effect of grain boundary oxide inclusions on the mechanical properties of hot-pressed beryllium.
It is also known that Beryllium strength properties including the precision elastic limit increase when content of hardening phases increase along grain boundaries, primarily Beryllium oxide [2-5].
However, the strength properties of the blanks depend on both the average grain size and the temperature of isostatic pressing (Figure 3).
Determined graphical and analytical dependences provide the possibility of “fine” control of the Beryllium strength properties by “dosing” the contribution of each element of the “dispersion-grain-boundary” hardening mechanism.
The effect of grain boundary oxide inclusions on the mechanical properties of hot-pressed beryllium.
Online since: December 2013
Authors: Nabil Al Batati, Fakhruldin M. Hashim, William Pao
Vibrations have been reported to have a major effect on the drilling performance, affecting the rate of penetration (ROP), causing severe damages to the drilling tools and also reduces the efficiency of the drilling process.
Drillstring vibrations are extremely complex because of the random nature of a multitude of factors such as: bit/formation interactions, drill string/wellbore interactions, and hydraulic function.
Vibrations are extremely complex because of the random nature of a multitude of factors such as bit/formation interactions, drillstring/wellbore interactions, and hydraulics function.
The riser modeled as a shell element with six degrees of freedom with the same material properties as drill pipe.The dimension properties are shown in Table 2.
Table 2 Material properties and parameters used for drill pipe, riser and wellbore Drill Pipe Riser Wall Thickness, m 0.0083 0.01 Outside diameter, m 0.2032 0.5 Force, kN 100 Length, m 550 500 Rotational velocity, RPM 80&300 Fig. 1.
Drillstring vibrations are extremely complex because of the random nature of a multitude of factors such as: bit/formation interactions, drill string/wellbore interactions, and hydraulic function.
Vibrations are extremely complex because of the random nature of a multitude of factors such as bit/formation interactions, drillstring/wellbore interactions, and hydraulics function.
The riser modeled as a shell element with six degrees of freedom with the same material properties as drill pipe.The dimension properties are shown in Table 2.
Table 2 Material properties and parameters used for drill pipe, riser and wellbore Drill Pipe Riser Wall Thickness, m 0.0083 0.01 Outside diameter, m 0.2032 0.5 Force, kN 100 Length, m 550 500 Rotational velocity, RPM 80&300 Fig. 1.
Analysis of the Replication Properties of Lightguiding Plate for Micro Injection Compression Molding
Online since: January 2007
Authors: H.J. Chang, L.H. Hung, Yung Kang Shen
Analysis of the Replication Properties of Lightguiding Plate for Micro Injection
Compression Molding
Y.K.
The mold temperature is the most significant factor of replication properties of microstructure of lightguiding plate for micro injection compression molding.
This paper uses the single-parameter method to discuss the replication properties for different process parameters.
Table 2 shows that the replication properties of microstructure on micro injection compression molding.
To sum up, the mold temperature is the most significant factor of process parameters for replication properties of lighguiding plate.
The mold temperature is the most significant factor of replication properties of microstructure of lightguiding plate for micro injection compression molding.
This paper uses the single-parameter method to discuss the replication properties for different process parameters.
Table 2 shows that the replication properties of microstructure on micro injection compression molding.
To sum up, the mold temperature is the most significant factor of process parameters for replication properties of lighguiding plate.
Online since: September 2011
Authors: Fei Hu Li, Zi Xin Dong, You Fu Hou, Chu Wen Guo, Qing Rui Meng
And it showed similar mechanical properties like solids.
The main factors affecting the performances of stability, rheological performance and saturation magnetization were analyzed.
The factors are shown in Table 1.
The influence of temperature on the properties.
As a result, it was not just the magnetic properties that were affected, but also the storage stability of production, the reaction could even not be completed.
The main factors affecting the performances of stability, rheological performance and saturation magnetization were analyzed.
The factors are shown in Table 1.
The influence of temperature on the properties.
As a result, it was not just the magnetic properties that were affected, but also the storage stability of production, the reaction could even not be completed.
Online since: November 2013
Authors: Vahid Rezazadeh, Salar Salahi, Amir Mostafapour
Hence, different methods have been used to improve the mechanical properties of pure copper.
In order to enhance the mechanical properties of copper joints, FSP has been regarded as an effective method.
The Mechanical properties investigation of FS welded pure copper joints was made by Shen et al. [7].
Grain size and dislocation density were major factors controlling hardness variations.
Effect of welding speed on microstructure and mechanical properties of friction stir welded copper.
In order to enhance the mechanical properties of copper joints, FSP has been regarded as an effective method.
The Mechanical properties investigation of FS welded pure copper joints was made by Shen et al. [7].
Grain size and dislocation density were major factors controlling hardness variations.
Effect of welding speed on microstructure and mechanical properties of friction stir welded copper.
Online since: August 2012
Authors: Kai Fu Li, Kai Meng Xu, Xue Tian Xie, Chen Ping Xie
The mechanism and factors of stability for different heat stabilizers were revealed by means of analyzing fourier transform infrared spectroscopy (FTIR).
The item researched the influence of four diverse stabilizers on the stable performance of WPC according to the process of extrusion and analysis for mechanical properties and FTIR.
The analysis method for FTIR and mechanical properties.
The performance of mechanical properties for Sample 1 and 4 were similar closely.
Similarly as the sample 1 and 4, there were very close properties between sample 2 and 3.
The item researched the influence of four diverse stabilizers on the stable performance of WPC according to the process of extrusion and analysis for mechanical properties and FTIR.
The analysis method for FTIR and mechanical properties.
The performance of mechanical properties for Sample 1 and 4 were similar closely.
Similarly as the sample 1 and 4, there were very close properties between sample 2 and 3.
Online since: February 2011
Authors: Bo Lin He, Ying Xia Yu, Jing Liu
So the mechanical properties of metal surface can be greatly improved.
The fatigue property will affect the life span of the bogie and the travelling crane safty of the vehicles [1~2].
The effect of hand-grinding and mechanical grinding on reducing the stress concentration and improving the fatigue properties was researcged in literature[9].
The diffusion model of the nanocrystalline material was studied and discussed the mutual influence among crystal fault slip grid, grain boundary sliding, grain boundary diffusion creep, rotating sliding and other factors[17].
There are many factors that affect the fatigue properties of the welding joints, mainly including the residual stress of the welding joints, the stress concentration and the organization of the joints and welding defects etc.
The fatigue property will affect the life span of the bogie and the travelling crane safty of the vehicles [1~2].
The effect of hand-grinding and mechanical grinding on reducing the stress concentration and improving the fatigue properties was researcged in literature[9].
The diffusion model of the nanocrystalline material was studied and discussed the mutual influence among crystal fault slip grid, grain boundary sliding, grain boundary diffusion creep, rotating sliding and other factors[17].
There are many factors that affect the fatigue properties of the welding joints, mainly including the residual stress of the welding joints, the stress concentration and the organization of the joints and welding defects etc.