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Online since: July 2013
Authors: J. Paulo Davim, T. Rajasekaran, V.N. Gaitonde
The evolution of cutting force depends on material properties, machining parameters such as cutting speed, feed and depth of cut.
The cutting force is essentially corresponds to the product of feed, depth of cut and specific cutting pressure and further it depends on cutting tool geometry, cutting conditions, types of cutting tools and properties of workpiece materials [21, 22].
This phenomenon could be attributed from the effect of radius of cutting tool edge in machining and also the interactions between cutting tool edge configuration, machining conditions and the properties of work piece constitute behavior.
The performance factors are calculated with an accuracy of 10-2.
The performance factors are calculated for specific cutting pressure with an accuracy of 10-2.
The cutting force is essentially corresponds to the product of feed, depth of cut and specific cutting pressure and further it depends on cutting tool geometry, cutting conditions, types of cutting tools and properties of workpiece materials [21, 22].
This phenomenon could be attributed from the effect of radius of cutting tool edge in machining and also the interactions between cutting tool edge configuration, machining conditions and the properties of work piece constitute behavior.
The performance factors are calculated with an accuracy of 10-2.
The performance factors are calculated for specific cutting pressure with an accuracy of 10-2.
Online since: January 2013
Authors: Lin Xiu Zhao, Si Guo Yuan, Jiao Sha, Shao Bin Li
The specific goal for the work reported here is to examine the effect of the pore structure of the polymeric adsorbents on adsorptive properties toward MB.
The polarity and pore size distribution of polymer adsorbents are also the important factors affecting adsorption.
If the pore diameter is too small, diffusion of adsorbate from the aqueous phase to the pores of the adsorbent will be hindered, thus affects the adsorption in a negative way.
Sheldon, Coagulation and precipitation of a mechanical pulping effluent-I.
Eiji, et al., Preparation of activated fibrous carbon from phenolic fabric and its molecular sieving properties.
The polarity and pore size distribution of polymer adsorbents are also the important factors affecting adsorption.
If the pore diameter is too small, diffusion of adsorbate from the aqueous phase to the pores of the adsorbent will be hindered, thus affects the adsorption in a negative way.
Sheldon, Coagulation and precipitation of a mechanical pulping effluent-I.
Eiji, et al., Preparation of activated fibrous carbon from phenolic fabric and its molecular sieving properties.
Online since: June 2012
Authors: István Mészáros
The magnetization curves were measured by a single sheet tester-type magnetic property analyzer.
Introduction Duplex stainless steels (DSS) represent a series of alloys characterized by high mechanical properties and corrosion resistance.
The properties of stainless steels can be studied by traditional microscopic, magnetic methods and modeling techniques as well [1, 2, 3, 4].
It was found that the substitution of Ni with a combination of Mn and N did not affect phase balance in LDSS [5].
(1) Where: Ni are scaling parameters, Ai are the amplitudes of magnetization components, αi. are the horizontal shifting factors.
Introduction Duplex stainless steels (DSS) represent a series of alloys characterized by high mechanical properties and corrosion resistance.
The properties of stainless steels can be studied by traditional microscopic, magnetic methods and modeling techniques as well [1, 2, 3, 4].
It was found that the substitution of Ni with a combination of Mn and N did not affect phase balance in LDSS [5].
(1) Where: Ni are scaling parameters, Ai are the amplitudes of magnetization components, αi. are the horizontal shifting factors.
Online since: August 2002
Authors: Ying Zhang, Lyndon Edwards, Michael E. Fitzpatrick
The
transverse stresses σy, σz, τyz and other stresses away from the cutting plane will not affect the
deformation on the boundary.
Two sets of tension-compression test data were recorded to examine the mechanical behaviour of the En8, one with the maximum loading strain of 0.026 and the other with the maximum strain approximate to 0.051.
Table 1 Measured Mechanical Properties of En8 (080M40) 0.2%Yield Stress (σ0) Elastic Modulus (E) Poisson's ratio (µ) Strain hardening exponent (n) Units MPa GPa Measured 450 195 0.295 6.5 The specimen containing the cold expanded hole was 100mm long, 40mm wide and 12mm thick, machined from a cold-drawn flat bar blank with cross section of 2" × 0.5" (49mm × 12.25mm).
However, efforts were made to minimize errors from each of these factors.
A multi-linear material model was used to represent the En8 mechanical behaviour in the FE analysis.
Two sets of tension-compression test data were recorded to examine the mechanical behaviour of the En8, one with the maximum loading strain of 0.026 and the other with the maximum strain approximate to 0.051.
Table 1 Measured Mechanical Properties of En8 (080M40) 0.2%Yield Stress (σ0) Elastic Modulus (E) Poisson's ratio (µ) Strain hardening exponent (n) Units MPa GPa Measured 450 195 0.295 6.5 The specimen containing the cold expanded hole was 100mm long, 40mm wide and 12mm thick, machined from a cold-drawn flat bar blank with cross section of 2" × 0.5" (49mm × 12.25mm).
However, efforts were made to minimize errors from each of these factors.
A multi-linear material model was used to represent the En8 mechanical behaviour in the FE analysis.
Online since: December 2013
Authors: Kang Zhao, Qun Yan Jia
Actual mining process was studied through calculation with every step of 10m excavation, as open stope method was used for this mining, the support effect of artificial ore column was affected by designed strength construction process and other factors influences, roof-contacting was often not enough or pillar strength could not reach design requirements and resulted in movement and even collapse of goaf overlying rock stratum.
(b) AE distribution of overburden rock with mining 30m (a) Failure model of overburden rock (a) AE distribution of overburden rock with mining 20m (b) Schematic diagram of mechanical model Fig.1.
Failure and mechanical models diagram of overburden rock under mining layout Fig.2.
The microcracks of the gathered nucleation will greatly reduce the mechanical properties of rock material; with the increase of goaf and under the influences of tectonic stress, self-weight stress and external disturbances, macroscopic failure was produced in the so-called " tranquil period " of AE.
(b) AE distribution of overburden rock with mining 30m (a) Failure model of overburden rock (a) AE distribution of overburden rock with mining 20m (b) Schematic diagram of mechanical model Fig.1.
Failure and mechanical models diagram of overburden rock under mining layout Fig.2.
The microcracks of the gathered nucleation will greatly reduce the mechanical properties of rock material; with the increase of goaf and under the influences of tectonic stress, self-weight stress and external disturbances, macroscopic failure was produced in the so-called " tranquil period " of AE.
Online since: September 2008
Authors: Charlotte Lelieveld, Liek Voorbij
Even though SMA's have a lot of disadvantages, with the correct determination of properties a workable prototype should
be able to be manufactured.
Aspects like electrical, thermal and mechanical behavior need to be designed simultaneously.
On the other side experimenting data can be invaluable due to the close relation with all the different factors.
Ashby, The selection of mechanical actuators based on performance indices.
Duerig, The Mechanical Aspects of Constrained Recovery, in Engineering aspects of Shape Memory Alloys, T.W.
Aspects like electrical, thermal and mechanical behavior need to be designed simultaneously.
On the other side experimenting data can be invaluable due to the close relation with all the different factors.
Ashby, The selection of mechanical actuators based on performance indices.
Duerig, The Mechanical Aspects of Constrained Recovery, in Engineering aspects of Shape Memory Alloys, T.W.
Online since: August 2010
Authors: K.P. Somashekhar, N. Ramachandran, Jose Mathew
EDM is best suited for machining high strength
conductive materials since neither mechanical contact nor cutting is necessary [1].
When tools are miniaturized, the surface microstructure and material texture begin to affect the mechanical properties of the components; thus undesirably increasing the structural sensitivity.
Micro tools used for micro punching and micro cutting require sufficient mechanical strength to withstand the load during machining.
Yates algorithm for finding significant factors of the overcut of the produced holes Fig.4 Half normal probability plot for the overcut of the micro holes Regression analysis is also performed to find out the relationship between process variables and performance characteristics considered.
When tools are miniaturized, the surface microstructure and material texture begin to affect the mechanical properties of the components; thus undesirably increasing the structural sensitivity.
Micro tools used for micro punching and micro cutting require sufficient mechanical strength to withstand the load during machining.
Yates algorithm for finding significant factors of the overcut of the produced holes Fig.4 Half normal probability plot for the overcut of the micro holes Regression analysis is also performed to find out the relationship between process variables and performance characteristics considered.
Online since: October 2014
Authors: Yuan Ying Qiu, Jun Jie Ye, Chao Wei, Qiu Yue Sun
Dynamic Analysis and Structural Optimization for a Logging While Drilling Neutron Instrument
Chao WEIa, Qiu-yue SUNb, Yuan-ying QIUc and Jun-jie YE*
School of Electro-Mechanical Engineering, Xidian University, Xi’an 710071, China
aweichao1927@163.com,bsunqiuyue900816@163.com, cyyqiu@mail.xidian.edu.cn, *ronkey6000@sina.com
Keywords: Logging while drilling neutron instrument, Dynamic analysis, Topological form improvement, Structural parameter optimization
Abstract.
The uniqueness of the function and structure form of the LWD neutron instrument studied in this paper leads to its particularity of the dynamic characteristics and influencing factors.
Due to structural complexity, the geometric model of the LWD neutron instrument is simplified as follows: deleting chamfering, holes and thread relief groove and simplifying the local components which compose of many small parts but have little influence on the mechanical properties of the whole model.
Therefore, it can be concluded that the modals of the x and y directions are easy to be inspired to cause the resonances and this will make the root-mean-square value of the acceleration response enlarge and then affect the precision of the instrument readings.
Li, Mechanical Vibration Theory, Zhejiang University, Hangzhou, 2005.
The uniqueness of the function and structure form of the LWD neutron instrument studied in this paper leads to its particularity of the dynamic characteristics and influencing factors.
Due to structural complexity, the geometric model of the LWD neutron instrument is simplified as follows: deleting chamfering, holes and thread relief groove and simplifying the local components which compose of many small parts but have little influence on the mechanical properties of the whole model.
Therefore, it can be concluded that the modals of the x and y directions are easy to be inspired to cause the resonances and this will make the root-mean-square value of the acceleration response enlarge and then affect the precision of the instrument readings.
Li, Mechanical Vibration Theory, Zhejiang University, Hangzhou, 2005.
Online since: March 2014
Authors: Doina Elena Gavrilă, Horia Catalin Gavrilă
The realization of HAMR involved some challenges from both optical design and media properties [3, 4].
It is based on the fact that the drastic decrease of the intrinsic magnetic properties of the medium (saturation magnetization Ms, anisotropy field, and coercive field Hc) when the temperature T of the media is increased.
Nevertheless, the lattice structure and the magnetic properties of the FePt-based alloys, correlated by the spin-orbital interaction, are affected by thermal agitation and, therefore, the heating and cooling issues are very important factors for HAMR media in both static and dynamic aspects [1].
Nevertheless, the technology based on lithography and nanoprinting involves the process of etching to form the magnetic bit, which damages the bit, thus affecting the magnetic anisotropy (and therefore the thermal stability) and increasing the switching field distribution.
A good choice of the layers separating the recording layer from the substrate (interlayer, seed layer and heat sink layer) is crucial from the viewpoint of the thermal design of HARM media so more as this design must take into consideration the magnetic, structural and even mechanical properties of the media configuration.
It is based on the fact that the drastic decrease of the intrinsic magnetic properties of the medium (saturation magnetization Ms, anisotropy field, and coercive field Hc) when the temperature T of the media is increased.
Nevertheless, the lattice structure and the magnetic properties of the FePt-based alloys, correlated by the spin-orbital interaction, are affected by thermal agitation and, therefore, the heating and cooling issues are very important factors for HAMR media in both static and dynamic aspects [1].
Nevertheless, the technology based on lithography and nanoprinting involves the process of etching to form the magnetic bit, which damages the bit, thus affecting the magnetic anisotropy (and therefore the thermal stability) and increasing the switching field distribution.
A good choice of the layers separating the recording layer from the substrate (interlayer, seed layer and heat sink layer) is crucial from the viewpoint of the thermal design of HARM media so more as this design must take into consideration the magnetic, structural and even mechanical properties of the media configuration.
Online since: November 2016
Authors: Yu You Yang, Yan Jun Du, Hao Liang Wu, M.L. Wei
Table 1 Properties of soil used in this study.
These products are little affected by heavy metals.
Binder content can also affect strength of the stabilized soil.
By laboratory tests, the strength characteristics, the heavy metals species distribution and micro-structural properties of KMP treated contaminated soils are examined.
Pulppara, Engineering properties and microstructural characteristics of cement solidified zinc-contaminated kaolin clay, Can.
These products are little affected by heavy metals.
Binder content can also affect strength of the stabilized soil.
By laboratory tests, the strength characteristics, the heavy metals species distribution and micro-structural properties of KMP treated contaminated soils are examined.
Pulppara, Engineering properties and microstructural characteristics of cement solidified zinc-contaminated kaolin clay, Can.