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Multi-Objective Optimization in Electrical Discharge Machining of 6061 Al/SiCp Using RSM and NSGA-II
Online since: August 2017
Authors: Jatinder Kumar, Balbir Singh, Sudhir Kumar
Metal matrix composites are widely used in industries due to improved properties such as high strength/weight ratio, corrosion and wear resistance.
Higher setting of current and pulse on time were reported significant factors to achieve higher MRR, TWR and SR [6].
Experimentation Al alloy 6061/10% wt SiCp composite was fabricated through mechanical stir casting process.
After deleting the non significant process parameters, RSM based mathematical models for the MRR and TWR are reprsented by Eq.1 and Eq.2 in terms of actual factors.
Conclusions · Current, pulse on time, pulse off time and voltage are affecting MRR significantly whereas for TWR, current, pulse on time and pulse off time are significant factors
Higher setting of current and pulse on time were reported significant factors to achieve higher MRR, TWR and SR [6].
Experimentation Al alloy 6061/10% wt SiCp composite was fabricated through mechanical stir casting process.
After deleting the non significant process parameters, RSM based mathematical models for the MRR and TWR are reprsented by Eq.1 and Eq.2 in terms of actual factors.
Conclusions · Current, pulse on time, pulse off time and voltage are affecting MRR significantly whereas for TWR, current, pulse on time and pulse off time are significant factors
Online since: December 2017
Authors: A. Ferreira Tomaz, R. Cardoso Barbosa, M.R. de Oliveira Pinto, M.V. Lia Fook, M.A. Sabino Gutierrez, A.G. Barbosa de Lima
General Properties
Polymeric membranes have several properties, such as mechanical, thermal, physical, chemical, biological, among others, and may vary according to the application of the membrane.
Tensile strength and elongation are the main mechanical properties of the biomembranes.
The mechanical tests are performed according to ASTM D638, 2002 standard, which determines the mechanical properties of films/thin membranes [17].
The permeability coefficient also depends on factors such as crystallinity, density, crosslinking, addition of additives as plasticizers, and sensitivity to moisture and temperature.
Yoo, The use of treatments to enhance the mechanical properties of electrospun poly(ε-caprolactone) scaffolds, Biomaterials. 29 (2008) 1422-1430.
Tensile strength and elongation are the main mechanical properties of the biomembranes.
The mechanical tests are performed according to ASTM D638, 2002 standard, which determines the mechanical properties of films/thin membranes [17].
The permeability coefficient also depends on factors such as crystallinity, density, crosslinking, addition of additives as plasticizers, and sensitivity to moisture and temperature.
Yoo, The use of treatments to enhance the mechanical properties of electrospun poly(ε-caprolactone) scaffolds, Biomaterials. 29 (2008) 1422-1430.
Online since: October 2007
Authors: Tetsuya Nemoto, Yasumi Ito, Akira Shimamoto, Kazuharu Koide, Akira Inamori, Shyuichi Yanai, Hiroyuki Matsuura
In this research, fatigue crack propagation tests of
magnesium alloy AZ31B and pure titanium TP340C were conducted under conditions of biaxial and
uniaxial loading by using a cruciform specimen in a bi-axial fatigue machine, in order to investigate
the effect of non-singular stress cycling on the fatigue crack growth properties ⊿K-da/dN.
For example, Tanaka et al. and Miller reported that the action of a stress parallel to a crack affects crack progress velocity [3, 4].
As a result, it was suggested that existence of a stress parallel to a crack affects crack progress velocity in AZ31B [5-7].
The mechanical property of AZ31B and TP340C are shown in Table 3, and the dimension and form of a specimen are shown in Fig. 1.
Table 3 Mechanical properties of magnesium alloy and pure titanium.
For example, Tanaka et al. and Miller reported that the action of a stress parallel to a crack affects crack progress velocity [3, 4].
As a result, it was suggested that existence of a stress parallel to a crack affects crack progress velocity in AZ31B [5-7].
The mechanical property of AZ31B and TP340C are shown in Table 3, and the dimension and form of a specimen are shown in Fig. 1.
Table 3 Mechanical properties of magnesium alloy and pure titanium.
Online since: August 2021
Authors: Ming Wang Fu, Jun Yuan Zheng
The properties of individual grains affect the mechanical behaviors and response of materials in micro-scaled deformation, viz., microforming, and there are unknown phenomena and deformation behaviors existing and limiting the wide application of microforming due to size effect.
However, the properties of grain boundaries are not well known but many atomic simulations revealed the grain boundary regions are mostly amorphous [4, 5].
Numerical methods have been widely applied to investigate the mechanical properties of material in serve plastic deformation and microforming process.
is the Schmid factor of the active slip system.
Cases with the same grain size have the same grain properties including grain distribution and grain orientations.
However, the properties of grain boundaries are not well known but many atomic simulations revealed the grain boundary regions are mostly amorphous [4, 5].
Numerical methods have been widely applied to investigate the mechanical properties of material in serve plastic deformation and microforming process.
is the Schmid factor of the active slip system.
Cases with the same grain size have the same grain properties including grain distribution and grain orientations.
Online since: June 2012
Authors: Xiao Bing Xu, Tian Kai Xiong, Li Jun Tan, Yi Zeng
However, the low efficiency and the high cost certainly affect its widely application.
Introduction Since EDM can be free of the affect from its material’s comprehensive mechanical properties such as hardness and brittleness, it is especially suitable for the conductive materials which are hard to be deal with conventional mechanical processing methods.
Generally speaking, with less the influential factors and comparatively clear regression model, a relatively more exact model can apparently be got by the regression techniques.
Modeling the manufacturing parameters in electrical discharge machining of silicon zed silicon carbide proceeding of the instituting of mechanical engineers, Part B: Engineering Manufacture, 2003, 217(6):791~803
Mechanical design, 2004, 22(11):6~9.
Introduction Since EDM can be free of the affect from its material’s comprehensive mechanical properties such as hardness and brittleness, it is especially suitable for the conductive materials which are hard to be deal with conventional mechanical processing methods.
Generally speaking, with less the influential factors and comparatively clear regression model, a relatively more exact model can apparently be got by the regression techniques.
Modeling the manufacturing parameters in electrical discharge machining of silicon zed silicon carbide proceeding of the instituting of mechanical engineers, Part B: Engineering Manufacture, 2003, 217(6):791~803
Mechanical design, 2004, 22(11):6~9.
Online since: October 2011
Authors: K. Kaminishi, M. Agus Choiron, Shigeyuki Haruyama
In order to ensure the properties of the material, SUS304 was initially validated using tensile test carried out based on JISZ2241 [8].
It was found from the material properties, the yield stress is 398.83 MPa.
These standard arrays stipulate the way of conducting the minimal number of experiments, which could give the full information of all the factors that affect the performance parameters [12].
Result And Discussion Although parameter factors affect the gasket performance is obtained, but with conventional design concept, after gasket design is created, it require evaluation analysis going through multiple build and test to verify performance.
The main effects of other factors are computed in similar manner.
It was found from the material properties, the yield stress is 398.83 MPa.
These standard arrays stipulate the way of conducting the minimal number of experiments, which could give the full information of all the factors that affect the performance parameters [12].
Result And Discussion Although parameter factors affect the gasket performance is obtained, but with conventional design concept, after gasket design is created, it require evaluation analysis going through multiple build and test to verify performance.
The main effects of other factors are computed in similar manner.
Online since: January 2014
Authors: Magdalena Piasecka
The paper describes selected passive methods of modifying properties and structures of metal surfaces.
The properties and structure of a heating surface can be modified using chemical, thermal, mechanical or combined mechanical and thermal processes.
Intensity of the transfer of the material depends on the number of factors, mainly on impulse energy.
The process under discussion consists in processing the material to achieve required geometric and/or the distribution of properties.
One of the surfaces (texturing 1) has the best properties in terms of heat transfer.
The properties and structure of a heating surface can be modified using chemical, thermal, mechanical or combined mechanical and thermal processes.
Intensity of the transfer of the material depends on the number of factors, mainly on impulse energy.
The process under discussion consists in processing the material to achieve required geometric and/or the distribution of properties.
One of the surfaces (texturing 1) has the best properties in terms of heat transfer.
Online since: October 2015
Authors: Andreas Sterzing, Dirk Landgrebe, Markus Bergmann
Most SPD methods are limited to laboratory investigations due to technical and economic factors.
The approach presented in this paper provides a contribution to cope with the limiting factors.
Further EBSD analysis is required as well other approaches to determine material characteristics and mechanical properties.
Mechanical properties were analyzed using hardness measurement.
Further developments will focus on the understanding of the interaction between the geometry of SPD forming elements and the resulting microstructure and mechanical properties.
The approach presented in this paper provides a contribution to cope with the limiting factors.
Further EBSD analysis is required as well other approaches to determine material characteristics and mechanical properties.
Mechanical properties were analyzed using hardness measurement.
Further developments will focus on the understanding of the interaction between the geometry of SPD forming elements and the resulting microstructure and mechanical properties.
Online since: December 2024
Authors: Dmytro Kolosov, Serhii Onyshchenko, Hanna Tantsura, Ivan Belmas, Olena Bilous, Kateryna Antonova
Strength properties of conveyor belts are analyzed in articles [11-14].
On the rope part that is not affected by external factors, the difference in displacements, as well as the difference in internal loading forces on rigid layers, decreases.
The last infinite part of the rope is not affected by external factors.
Tangential stresses in material connecting and covering the layers depend on properties of rope material, the scheme of connecting the layers to the structure.
Conclusion A mathematical model constructed using the methods of mechanics of layered composite materials comprehensively takes into account composite design of a rope, its structural and mechanical properties, and the condition of connecting rope ends to a permanent structure.
On the rope part that is not affected by external factors, the difference in displacements, as well as the difference in internal loading forces on rigid layers, decreases.
The last infinite part of the rope is not affected by external factors.
Tangential stresses in material connecting and covering the layers depend on properties of rope material, the scheme of connecting the layers to the structure.
Conclusion A mathematical model constructed using the methods of mechanics of layered composite materials comprehensively takes into account composite design of a rope, its structural and mechanical properties, and the condition of connecting rope ends to a permanent structure.
Online since: March 2015
Authors: Iulian Antoniac, Marin Bane, Florin Miculescu, Marian Miculescu, Lucian Toma Ciocan, Oana Preda
This paper aims to present the composition, properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses, and to expose a method for analysing the bonding strength and components compatibility between dental alloys and ceramic.
Moreover, a mechanical contamination at the material’s surface is possible by the migration of the chemical elements, due to the mechanical stresses during cutting/polishing and to the hardness differences between the prosthesis components.
Our research aims to find those factors that influence the physical-chemical bonding, the diffusion layer thickness at the interface and also better sample preparation methods [2].
Also, in our work we evaluate the properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses.
The sample preparation type has the advantage that the mechanical preparation of any metallographic samples minimally affects the "S" zone interface.
Moreover, a mechanical contamination at the material’s surface is possible by the migration of the chemical elements, due to the mechanical stresses during cutting/polishing and to the hardness differences between the prosthesis components.
Our research aims to find those factors that influence the physical-chemical bonding, the diffusion layer thickness at the interface and also better sample preparation methods [2].
Also, in our work we evaluate the properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses.
The sample preparation type has the advantage that the mechanical preparation of any metallographic samples minimally affects the "S" zone interface.